Gap States of a Polyethylene Model Oligomer Observed by Using High-Sensitivity Ultraviolet Photoelectron Spectroscopy

Special Section on Recent Progress in Organic Molecular Electronics and Biotechnology

Yuki YAMAGUCHI, Kohei SHIMIZU, Atsushi MATSUZAKI, Daisuke SANO, Tomoya SATO, Center for Frontier Science, Chiba University">Yuya TANAKA, Center for Frontier Science, Chiba University
Molecular Chirality Research Center, Chiba University">Hisao ISHII

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Keywords: polyethylene oligomer, C₄₄H₉₀, gap states, triboelectricity, photoemission spectroscopy

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2019 Volume E102.C Issue 2 Pages 168-171

DOI https://doi.org/10.1587/transele.2018OMS0008

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Abstract

The gap states of tetratetracontane (C₄₄H₉₀; TTC), which is a model oligomer of polyethylene, was examined by using high-sensitivity UV photoemission spectroscopy (HS-UPS). The high sensitivity enabled us to directly observe the weak gap states distributed in the HOMO-LUMO gap from the valence band top to 3.0 eV below the vacuum level. On the basis of the density-of-states derived from UPS results, the tribocharging nature of polyethylene was discussed in comparison with our previous result for nylon-6,6 film.

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