44H90; 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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Gap States of a Polyethylene Model Oligomer Observed by Using High-Sensitivity Ultraviolet Photoelectron Spectroscopy

Yuki YAMAGUCHI
Kohei SHIMIZU
Atsushi MATSUZAKI
Daisuke SANO
Tomoya SATO
Yuya TANAKA
Hisao ISHII

Publication
IEICE TRANSACTIONS on Electronics   Vol.E102-C    No.2    pp.168-171
Publication Date: 2019/02/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2018OMS0008
Type of Manuscript: BRIEF PAPER
Category: 
Keyword: 
polyethylene oligomer,  C44H90,  gap states,  triboelectricity,  photoemission spectroscopy,  

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Summary: 
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.