期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 80, 期 -, 页码 78-83出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2015.01.004
关键词
Polymers; Thin films; Chemical synthesis; Optical properties
资金
- University Grant Commission (UGC), New Delhi, India [41-910/2012(SR)]
This paper reports the effect of oxidant to monomer (O/M) ratio on optical and structural properties of Polypyrrole (PPy) thin film deposited by chemical oxidation polymerization technique. Noticeable changes have observed in the properties of PPy thin films with O/M ratio. Cauliflower structure have been observed in FE-SEM images, wherein grain size is observed to decrease with increase in O/M ratio. AFM results are in good agreement with FE-SEM results. From FTIR spectra it is found that, PPy is in highly oxidized form at low O/M ratio but oxidation decreased with increase in O/M ratio. Also C-C stretching vibrations of PPy ring is decreased whereas C=C stretching is increased with ratio. Absorption peak around 450 nm corresponds to pi-pi* transition and around 800 nm for polarons and bipolarons. The intensity of such peaks-confirms the conductivity of PPy, which is-observed maximum at low O/M ratio and found to decrease with increase in ratio. Optical band gap (BG) is found to increase from 2.07 eV to 2.11 eV with increase in the O/M ratio. (C) 2015 Elsevier Ltd. All rights reserved.
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