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Effects of Doping States of Polyaniline Thin Films on Their Photo‐Responsive Properties under Visible and Near‐Infrared Irradiation
Author(s) -
Choi Jongwan,
Jang Sung K.,
Kim Felix Sunjoo
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201701019
Subject(s) - photocurrent , doping , polyaniline , materials science , thin film , irradiation , optoelectronics , photoconductivity , infrared , aqueous solution , surface photovoltage , electrical resistivity and conductivity , photochemistry , absorption (acoustics) , analytical chemistry (journal) , nanotechnology , spectroscopy , optics , chemistry , composite material , organic chemistry , polymer , physics , nuclear physics , polymerization , electrical engineering , engineering , quantum mechanics
The photo‐responsive characteristics of polyaniline (PANI) thin films are investigated as a function of the doping states. The doping levels are controlled by treating as‐prepared, acid‐doped PANI with aqueous ammonia solutions. Spectroscopic analyses confirm the changes in the doping states by evolution or decrease of characteristic peaks. The electrical and photo‐responsive properties are significantly affected by the doping states of the PANI thin films. The photocurrent and photovoltage under irradiation of controlled wavelengths from various laser sources are measured. While the photocurrent follows the trends of electrical conductivity upon dedoping, the photovoltage is related to the absorption and photocharge generation of the PANI samples.