CN106862581B - A kind of concave surface gold@silver platinum Heterogeneous Composite nanoparticle and preparation method thereof with superior catalytic and absorbing properties - Google Patents
A kind of concave surface gold@silver platinum Heterogeneous Composite nanoparticle and preparation method thereof with superior catalytic and absorbing properties Download PDFInfo
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- CN106862581B CN106862581B CN201510908603.6A CN201510908603A CN106862581B CN 106862581 B CN106862581 B CN 106862581B CN 201510908603 A CN201510908603 A CN 201510908603A CN 106862581 B CN106862581 B CN 106862581B
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Abstract
The present invention relates to a kind of concave surface gold@silver platinum Heterogeneous Composite nanoparticles and preparation method thereof.The method is to make seed with prefabricated gold nano octahedron, ethylene glycol mixed solution containing gold nano octahedron, Platinous Potassium Chloride, silver nitrate and ascorbic acid is heated under ambiance using seed mediated growth method, make silver-colored platinum in the octahedra six vertex orientated depositions of gold nano, and then forms the golden@silver platinum Heterogeneous Composite nanoparticle that scale is uniform, ingredient is adjustable, shape is concave.Gold@silver platinum Heterogeneous Composite nanoparticle obtained in the solution such as water, ethylene glycol have it is good dispersibility and stability, at room temperature with saved for a long time under ambiance do not occur reunite precipitating or deformation.Gold silver-colored platinum Heterogeneous Composite nanoparticle in concave surface that the present invention obtains has superior catalytic activity and absorbing properties, be expected to surface plasma bulk optics, fuel cell, in terms of there is important application value.
Description
Technical field
The concave surface gold@silver platinum Heterogeneous Composite nanometer with superior catalytic activity and absorbing properties that the present invention relates to a kind of
Particle and preparation method thereof.
Background technique
Compared with monometallic nano particle, the composite nanometer particle being made of two or more metallic elements can not only have
Special performance between machine set heterogeneity, and using coordinative role between metal further enhance metal inherent characteristic and
Hatch new performance.Meanwhile people can receive metal composite by the various structures factor such as scale, pattern, ingredient, structure
The performance of rice material carries out Effective Regulation.It is well known that noble metal platinum have very excellent catalytic performance, Industrial Catalysis,
The numerous areas such as fuel cell, vehicle maintenance service have highly important application value.Noble metal gold and silver nano material has
Unique surface plasmon absorption characteristic and biocompatibility.These characteristics make it in surface plasma bulk optics, table
Face enhances Raman spectrum, cell imaging, photo-thermal therapy etc. and wide application prospect.Therefore, multi-functional Au-Ag-Pt is constructed
Composite nanoparticle causes the extensive concern of people in recent years.Currently, the synthetic method of Au-Ag-Pt composite nanoparticle includes:
1) nano platinum particle surface is modified with gold or gold and silver cluster；2) seed is done with gold nanoparticle, deposits platinum on its surface
Or platinum silver constructs core-shell structure nanometer particle；3) template is done with Nano silver grain, golden platinum or gold is constructed using displacement lithographic method
Silver-colored platinum hallow nanoparticles.Using above-mentioned strategy, J. Zhang et al. is using gold or gold and silver nanocluster Modified Platinum nano-catalytic
Agent surface not only increases platinum nano catalyst thermal and electrochemical catalytic stability, and utilizes the association between platinum and gold or gold and silver
Same-action improves platinum to the oxidizing potential of redox reactions, and then the platinum nano catalyst for modifying gold nanoclusters is still
Show preferable catalytic activity.Y. Ding et al. deposits copper in gold surface using underpotential deposition method, then copper and chloroplatinic acid
Displacement reaction in situ is prepared for golden platinum core-shell nano Porous materials.Y. Kim et al. is planted with golden octahedron, cube, nanometer rods
Son has constructed golden core platinum nanosphere dendrite shell dissimilar materials using seed mediated growth method.Y. Xia et al. is to different-shape silver nanoparticle
Potassium platinate is added in material colloids solution or gold chloride/Platinous Potassium Chloride mixed solution has synthesized a series of silver-colored platinum or Au-Ag-Pt is multiple
Close hallow nanoparticles.However, your gold golden platinum or Au-Ag-Pt composite nanoparticle that the above method is constructed although effectively increase
Belong to the catalytic activity and stability of platinum, but does not show good surface plasmon absorption characteristic.That is, adopting
With existing synthetic route, people are difficult to prepare the Au-Ag-Pt composite nanoparticle with good optical characteristic.Therefore, develop one
The easy-to-use synthetic method of kind, the high and Au-Ag-Pt composite nanoparticle with excellent optical property of preparation catalytic activity have
There are important scientific meaning and practical application value.
Summary of the invention
It is an object of that present invention to provide a kind of silver-colored platinum in golden octahedra six vertex orientated deposition methods, and preparation has excellent
The concave surface gold@silver platinum composite nanoparticle of catalytic activity and absorbing properties.
Gold silver-colored platinum Heterogeneous Composite nanoparticle in concave surface is to do seed with golden octahedron in the present invention, using seed mediated growth method
Second two of the heating containing golden octahedron, Platinous Potassium Chloride, silver nitrate and ascorbic acid under the conditions of ambiance and certain temperature
What mixed alkoxide solution obtained.The concave surface typical but non-limiting synthesis process of gold@silver platinum composite nanoparticle include with
Lower specific implementation step:
(1) under agitation, by gold chloride, diallyl dimethyl ammoniumchloride (PDDA, Mw=100000-
200000,20 wt%) aqueous solution is successively added in ethylene glycol solution, it is molten to obtain the preparation octahedral precursors of gold nano
Liquid, wherein in solution diallyl dimethyl ammoniumchloride, the concentration of gold chloride be respectively 0.005-0.5 mol/L,
0.0001-0.01 mol/L；
(2) above-mentioned prepared reaction precursor liquid solution is placed under 150-250 degree and is reacted 0.5-12 hours, Jenner is made
The octahedra colloidal solution of rice, solution colour are rendered as aubergine；
(3) it after naturally cooling to room temperature, is successively added under agitation to gold nano octahedron colloidal solution a certain amount of
Ascorbic acid, silver nitrate and Platinous Potassium Chloride aqueous solution, the wherein concentration point of ascorbic acid, silver nitrate, Platinous Potassium Chloride
It Wei not 0.0005-0.01 mol/L, 0.000001-0.00005 mol/L and 0.000005-0.0001 mol/L；
(4) solution (3) is reacted 5-500 minutes under 50-250 degree, solution colour becomes blue from purplish red, and gold@is made
Silver-colored platinum Heterogeneous Composite nanometer particle colloid solution；
(5) the golden@silver platinum Heterogeneous Composite nanometer particle colloid solution of acquisition is centrifugated with centrifuge, in revolving speed
After being centrifuged 10-100 minutes under 5000-14500 revs/min, colourless solution in centrifuge tube is removed, blue precipitate product is obtained；
(6) the blue precipitate product obtained is cleaned with solvent supersonic, gold@silver platinum Heterogeneous Composite nanoparticle is made.
Beneficial effects of the present invention
(1) product produced by the present invention is the golden@silver platinum Heterogeneous Composite nanoparticle of concave, yield height, pattern
Rule and particle scale is uniform, has good dispersibility and stability in water and ethylene glycol, can at room temperature and environment
It saves and is not precipitated for a long time under atmosphere；
(2) gold silver-colored platinum Heterogeneous Composite nanoparticle in concave surface is that silver-colored platinum is fixed on octahedra six vertex of gold nano in the present invention
It is formed to deposition, wherein the content of silver-colored platinum and ratio can pass through silver nitrate, the additive amount Effective Regulation of Platinous Potassium Chloride；
(3) gold silver-colored platinum composite nanoparticle in concave surface is heterojunction structure rather than core-shell structure in the present invention, electrochemistry circulation volt
Peace curve test shows that gold nano octahedron surface is not covered by silver-colored platinum completely；
(4) gold silver-colored platinum composite nanoparticle in concave surface not only has very excellent catalytic activity in the present invention, but also has good
Good surface plasmon absorption performance；
(5) synthetic route provided in the present invention is not only suitable for the preparation of concave surface gold@silver platinum composite nanoparticle, and passes through
Regulate and control experiment parameter, the core-shell structures composite nanoparticles such as golden@platinum, gold@silver, gold@silver platinum can be prepared；
(6) preparation of the invention only needs the common conventional equipment in laboratory, is not required to special equipment, and technical process is simply easily grasped
Make；
(7) the raw materials used in the present invention is abundant, pollution-free, be suitble to concave surface gold@silver platinum Heterogeneous Composite nanoparticle magnanimity, it is low at
Originally, large-scale production and preparation.
Technical solution of the present invention is further illustrated below with reference to the accompanying drawings and specific embodiments.
Detailed description of the invention
Fig. 1 is received to the gold nano octahedron colloidal solution of acquisition and with its golden@silver platinum Heterogeneous Composite for making seed preparation
One of multiple optical photographs that rice corpuscles colloidal solution Sony NP-FE1 is shot, Fig. 1 a are that gold nano octahedron colloid is molten
Liquid, solution colour are aubergine, and Fig. 1 b is blue gold@silver platinum Heterogeneous Composite nanometer particle colloid solution；
Fig. 2 is that the gold nano octahedron obtained to embodiment 1 is received with its golden@silver platinum Heterogeneous Composite for making seed preparation
One of multiple transmission electron microscope photos (TEM) shot after rice corpuscles Japan Electronics JEOL-1400 transmission electron microscope observation,
Wherein, Fig. 2 a is the octahedral low power TEM image of gold nano, and Fig. 2 b is the octahedral high power TEM image of gold nano, and Fig. 2 c is
The low power TEM image of golden@silver platinum Heterogeneous Composite nanoparticle, Fig. 2 d are that the high power TEM of gold@silver platinum Heterogeneous Composite nanoparticle schemes
Picture, the scale in Fig. 2 a, 2b, 2c, 2d is respectively 500 nanometers, 100 nanometers, 500 nanometers with 100 nanometers.It can by Fig. 2 c and Fig. 2 d
See, final product uniform, very high concave shape nano particle of yield for scale, particle surface and inside do not observe twin boundary
Face, granular size are 45 nanometers；
Fig. 3 is with 500 type field emission scanning electron microscope of Zeiss Sigma to golden@silver platinum Heterogeneous Composite nanoparticle
One of multiple stereoscan photographs (FESEM) taken the photograph after being observed, the scale in Fig. 3 a, 3b are respectively 500 nanometers and 20
Nanometer.It can be seen by Fig. 3 a and Fig. 3 b, product has sharp vertex, and pattern is concave shape and surface is smooth, and scale is very equal
Even, monodispersity is very good；
Fig. 4 is the X-ray obtained after being tested with Oxford X-ray energy spectrometer golden@silver platinum Heterogeneous Composite nanoparticle
Energy spectrum diagram (EDS), wherein ordinate is intensity, and abscissa is energy.By EDS map it is found that obtain product component except gold,
Three kinds of silver, platinum elements are outer (aluminium element comes from aluminium flake substrate), without other any impurities；
Fig. 5 is the circulation volt of the golden@silver platinum Heterogeneous Composite nanoparticle measured with Shanghai Chen Hua 760D electrochemical workstation
Pacify curve (CV), the redox peaks of gold, platinum can be clearly seen in figure, show gold nano octahedron surface not completely by silver-colored platinum
Covering, obtaining product is gold@silver platinum Heterogeneous Composite nanoparticle rather than core-shell nano；
Fig. 6 is with Japan Shimadzu UV-3101PC type ultraviolet-visible-near infrared spectrometer (UV-Vis-NIR)
To gold nano octahedron with using its tested for concave surface gold@silver platinum Heterogeneous Composite nanoparticle prepared by seed after obtained light
Absorb spectrogram, wherein ordinate is absorption intensity, and abscissa is optical wavelength.Wherein spectral line a is the octahedra ultraviolet suction of gold in figure
Spectrum is received, curve b is concave surface gold@silver platinum composite nanoparticle uv absorption spectra in figure, and what is obtained known to spectrogram is recessed
Face gold@silver platinum Heterogeneous Composite nanoparticle has good absorbing properties in visible region；
Fig. 7 is to pass through the golden@platinum and gold@galactic nucleus of regulation experiment parameter preparation using synthetic route provided in the present invention
The optical photograph of shell composite nanometer particle colloid and corresponding light absorption spectrogram, transmission electron microscope photo.Wherein Fig. 7 a points
Not Wei (1) purplish red coloured gold octahedron nanometer particle colloid solution, (2) purple gold platinum nucleocapsid composite nanoparticle colloidal solution and
(3) red gold@galactic nucleus shell composite nanometer particle colloidal solution optical photograph, Fig. 7 b are gold octahedra (spectral line 1), gold@platinum nucleocapsid
Composite nanoparticle (spectral line 2) and the corresponding optical absorption map of gold@galactic nucleus shell composite nanometer particle (spectral line 3), Fig. 7 c are gold@platinum
The transmission electron microscope photo of nucleocapsid composite nanoparticle, Fig. 7 d are that the transmitted electron of gold@galactic nucleus shell composite nanometer particle is aobvious
Micro mirror photo.Scale in Fig. 7 c and Fig. 7 d is 100 nanometers.It can be seen from Fig. 7 b compared with gold nano octahedron seed,
The light absorption of golden@platinum composite nanoparticle has occurred red shift, remitted its fury, and gold@galactic nucleus shell composite nanometer particle light absorption
Blue shift occurs.Corresponding transmission electron microscope image show golden@platinum and gold@galactic nucleus shell composite nanometer particle obviously with golden@silver platinum
Heterogeneous Composite nanoparticle is different: golden platinum nucleocapsid composite nanoparticle is octahedral shape, golden galactic nucleus shell composite nanometer particle
For torispherical；
Fig. 8 is octahedra for the golden@silver platinum, gold@platinum, gold nano of probe test with the hydrogenation catalyst reaction of p-nitrophenol
The catalytic performance of composite nanoparticle, it is pair that wherein Fig. 8 a, which is p-nitrophenol hydrogenating reduction in the presence of catalyst and reducing agent,
The schematic diagram of amino-phenol, when Fig. 8 b is using concave surface gold@silver platinum Heterogeneous Composite nanoparticle as catalyst, p-nitrophenol is urged
The UV-Visible absorption for changing hydrogenation process changes map, when Fig. 8 c is different nanoparticle as catalyst, to nitre
P-nitrophenol concentration changes with time curve during base phenol catalytic hydrogenation reaction, Fig. 8 d are that above-mentioned different catalysts exist
When the differential responses time under corresponding ln (Ct/Co), wherein C0For initial p-nitrophenol concentration, CtIt is after reaction t minutes to nitre
Base phenol concentration, the results showed that p-nitrophenol rate of reduction is to meet first order rate equation in the presence of a catalyst, meter
It calculates it is found that reaction rate constant is 0.29 × 10 when golden octahedron is catalyst-3, concave surface gold@silver platinum Heterogeneous Composite nanoparticle
The rate of reduction constant of p-nitrophenol is 1.67 × 10 when for catalyst-3.Obviously, concave surface gold@silver platinum Heterogeneous Composite nanoparticle
Son has excellent catalytic activity to p-nitrophenol catalytic hydrogenation reaction；
Fig. 9 is to be received using synthetic route provided in the present invention with the concave surface gold@silver platinum Heterogeneous Composite prepared in example 1
Rice corpuscles makees seed, the golden@silver platinum Heterogeneous Composite nanoparticle for adding Platinous Potassium Chloride again and being obtained by controlling its additive amount
One of multiple transmission electron microscope (TEM) photos shot after son JEOL-1400 transmission electron microscope observing, wherein Fig. 9 a is reaction system
The TEM image of product is obtained when middle Tetrachloroplatinate potassium concn is 0.03 mM, Fig. 9 b is that Tetrachloroplatinate potassium concn is in reaction system
0.06 mM obtains the TEM image of product, and Fig. 9 c is the TEM that Tetrachloroplatinate potassium concn is 0.09 mM obtains product in reaction system
Image, Fig. 9 d are the TEM images that Tetrachloroplatinate potassium concn is 0.12 mM obtains product in reaction system, as seen from the figure,
Golden@silver platinum Heterogeneous Composite nanoparticle is concave.
Specific embodiment
Diallyl dimethyl required for preparation concave surface gold@silver platinum Heterogeneous Composite nanoparticle is bought from market first
Ammonium chloride (Mw=100000-200000,20 wt%) aqueous solution, ethylene glycol (EG), gold chloride (HAuCl4), silver nitrate (AgNO3),
Ascorbic acid (AA), Platinous Potassium Chloride (K2PtCl4), using preceding without doing any purification process.Then with 18 megaohms of deionized waters
Prepare gold chloride (HAuCl4), silver nitrate (AgNO3), ascorbic acid (AA), Tetrachloroplatinate aqueous solutions of potassium, wherein gold chloride
(HAuCl4), silver nitrate (AgNO3), ascorbic acid (AA), Platinous Potassium Chloride concentration of aqueous solution be respectively 1 mol/L, 0.01
Mol/L, 0.25 mol/L, 0.125 mol/L.
The contents of the present invention are described in further detail combined with specific embodiments below, but the present invention is not limited to following
The specific examples of act.
Embodiment 1
The preparation of concave surface gold@silver platinum composite nanoparticle
Diallyl dimethyl ammoniumchloride (M is successively added into ethylene glycol solution firstw=100000-200000,20
Wt%), gold chloride (HAuCl4) aqueous solution, mixing shakes up, and moves into 220 degree oil baths and reacts 3 hours, and preparation scale is 45 nanometers
Gold nano it is octahedra, obtain the octahedra seed solution of gold, wherein diallyl dimethyl ammoniumchloride (Mw=100000-
200000,20 wt%), gold chloride (HAuCl4) concentration of aqueous solution difference 0.025 mol/L, 0.0005 mol/L.Then it takes
The octahedra seed solution of 50 milliliters of gold, successively adds silver nitrate (AgNO3), ascorbic acid (AA), Platinous Potassium Chloride (K2PtCl4)
Aqueous solution, which sufficiently shakes up, obtains reaction precursor liquid solution, wherein ascorbic acid (AA), silver nitrate (AgNO3), Platinous Potassium Chloride
(K2PtCl4) in the reaction system ultimate density be respectively 0.0025 mol/L, 0.000015 mol/L, 0.000015 mmoles
You/liter.Reaction precursor liquid solution is placed in 220 degree of oil baths to react and obtains within 3 hours the silver-colored platinum composite nanoparticle colloid of concave surface gold
Solution is abbreviated as colloid 1, after taking 2 milliliters of 1 solution of colloid to be centrifuged 30 minutes under the conditions of 10000 revs/min of revolving speed, remove from
Heart pipe colourless solution at the middle and upper levels, obtains blue precipitate product；Precipitated product is cleaned by ultrasonic 3-5 times with deionized water, is made such as
Au-Ag-Pt molar ratio shown in Fig. 2 c, 2d is the concave surface gold@silver platinum Heterogeneous Composite nanoparticle of 100:3:3.
Embodiment 2
The preparation of golden@platinum, gold@galactic nucleus shell composite nanometer particle
Take the octahedra seed solution of 8 ml gold to be put into reaction flask A, B, be then added into reaction flask A ascorbic acid (AA),
Platinous Potassium Chloride (K2PtCl4), wherein ascorbic acid (AA), Platinous Potassium Chloride (K in reaction system2PtCl4) concentration is respectively
Ascorbic acid (AA), silver nitrate (AgNO are added into reaction flask B for 0.0025 mol/L, 0.000015 mol/L3), wherein
Ascorbic acid (AA), silver nitrate (AgNO in reaction system3) ultimate density be respectively 0.0025 mol/L, 0.000015 mole/
It rises.Finally reaction flask A, B are placed in 220 degree of oil baths and react 3 hours acquisition gold@platinum, gold@galactic nucleus shell composite nanometer particle colloid
Solution is centrifuged after twenty minutes under the conditions of 8000 revs/min of revolving speed using supercentrifuge, it is colourless molten at the middle and upper levels to remove centrifuge tube
Liquid obtains purple, red precipitate product.Precipitated product is cleaned by ultrasonic 3-5 times with deionized water, is made such as Fig. 7 c, Fig. 7 d
Golden@platinum, gold@galactic nucleus shell composite Nano nanoparticle.
Embodiment 3
The preparation of different element composition concave surface gold@silver platinum composite nanoparticles
Take 10 milliliters of 1 solution of colloid to be put into reaction flask C, D, E, F respectively, at room temperature respectively addition 0.0192,0.0576,
0.096,0.1344 milliliter of concentration is 0.125 mol/L Platinous Potassium Chloride (K2PtCl4) aqueous solution, then in 220 degree of oil baths
Reaction obtains the different concave surface gold@silver platinum Heterogeneous Composite nanometer particle colloid solution of ingredient in 3 hours.Turned using supercentrifuge
After being centrifuged 30 minutes under the conditions of 10000 revs/min of speed, centrifuge tube colourless solution at the middle and upper levels is removed, blue precipitate product is obtained；With
Deionized water is cleaned by ultrasonic precipitated product 3-5 times, and it is respectively 100:6:3,100 that Au-Ag-Pt molar ratio as shown in Figure 9, which is made:
The concave surface gold@silver platinum Heterogeneous Composite nanoparticle of 12:3,100:18:3,100:24:3.
Claims (2)
1. a kind of concave surface gold@silver platinum Heterogeneous Composite nanoparticle with superior catalytic activity and absorbing properties, feature exist
In:
(1) gold@silver platinum Heterogeneous Composite nanoparticle is to be grown to be formed in the octahedra six vertex orientated depositions of gold nano by silver-colored platinum
With concave surface pattern, non-core-shell structure Heterogeneous Composite nanoparticle；
(2) concave surface gold@silver platinum Heterogeneous Composite nanoparticle has good dispersibility and stability in water, ethylene glycol, can
At room temperature with saved for a long time under ambiance and do not occur reunite precipitating or deformation；
(3) constituent of concave surface gold@silver platinum Heterogeneous Composite nanoparticle can pass through silver nitrate, the additive amount tune of Platinous Potassium Chloride
Control；
(4) there is concave surface gold@silver platinum Heterogeneous Composite nanoparticle very excellent catalytic activity and surface plasma body resonant vibration to inhale
Receive performance.
2. the preparation method of concave surface gold@silver platinum Heterogeneous Composite nanoparticle described in claim 1 the following steps are included:
(1) under agitation, gold chloride, diallyl dimethyl ammoniumchloride (PDDA) aqueous solution are successively added to second two
In alcohol, the preparation octahedral precursor solution of gold nano is obtained, wherein the molecular weight of PDDA used is 100000-200000, water
Percentage composition is 20 wt% in solution, PDDA in presoma, gold chloride concentration be respectively 0.005-0.5 mol/L,
0.0001-0.01 mol/L；
(2) above-mentioned precursor solution is placed under 150-250 degree and is reacted 0.5-12 hours, aubergine gold nano octahedron grain is made
Sub- colloidal solution；
(3) it after gold nano octahedron colloidal solution naturally cools to room temperature, successively adds under agitation a certain amount of anti-
Bad hematic acid, silver nitrate and Tetrachloroplatinate aqueous solutions of potassium, wherein ascorbic acid, silver nitrate, Platinous Potassium Chloride concentration be respectively
0.0005-0.01 mol/L, 0.000001-0.00005 mol/L and 0.000005-0.0001 mol/L；
(4) presoma for obtaining step (3) reacts 5-500 minutes under 50-250 degree, and solution colour becomes blue from purplish red,
Gold@silver platinum Heterogeneous Composite nanometer particle colloid solution is made；
(5) the golden@silver platinum Heterogeneous Composite nanometer particle colloid solution of acquisition is centrifuged under 5000-14500 revs/min of revolving speed
After 10-100 minutes, colourless solution in centrifuge tube is removed, obtains blue precipitate product；
(6) the bluish violet precipitated product obtained is cleaned as solvent supersonic with 18 megaohms of deionized waters or distilled water, concave surface gold@is made
Silver-colored platinum Heterogeneous Composite nanoparticle.
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| CN108927151A (en) * | 2018-06-08 | 2018-12-04 | 南京邮电大学 | The method for preparing golden platinum core-shell nanostructure material |
| CN109604631B (en) * | 2018-12-18 | 2021-10-15 | 温州大学 | Method for preparing Pd-Pt heterostructure nanocrystalline |
| CN112809018B (en) * | 2020-12-31 | 2023-08-11 | 杭州电子科技大学 | Synthesis method of gold-platinum bimetallic structural material |
| CN113118437A (en) * | 2021-03-18 | 2021-07-16 | 东南大学 | Gold, silver and platinum core-shell hollow nano brick and preparation method and application thereof |
| CN113319275B (en) * | 2021-04-14 | 2022-08-12 | 深圳大学 | Au @ AgNRs nanorod as well as preparation method and application thereof |
| CN113842910B (en) * | 2021-11-10 | 2022-08-30 | 江南大学 | Chiral Pt @ Au material and preparation method and application thereof |
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