TY - JOUR
T1 - Mechanism of conductivity decay of polypyrrole exposed to water and enhancement of conductivity stability of copper(I)-modified polypyrrole
AU - Liu, Yu Chuan
AU - Hwang, Bing Joe
N1 - Funding Information:
We thank the National Science Council of the Republic of China (NSC-88-2214-E-011-020), Van Nung Institute of Technology and National Taiwan University of Science and Technology for their financial support.
PY - 2001
Y1 - 2001
N2 - The degradation of polypyrrole (PPy)-based films was examined in a 50% relative humidity and oxygen free atmosphere for 50 days. The results reveal that polymerization potential, modification of PPy with Cu(I), and treatment of PPy with water in preparation, demonstrate significant influences on the conductivity and the corresponding stability of PPy. PPy prepared at an over-oxidizing potential and treated with water for 0.5 h exhibits a serious decrease in conductivity by about 93%, whereas the Cu-modified PPy becomes more stable. This is attributed to electron transfer from Cu to the N+ of PPy. The concept of fixed and removable water adsorbed on PPy is introduced to explain the experimental results. Also, an aging mechanism involving the interaction between H2O and PPy is proposed to explain the decay in conductivity.
AB - The degradation of polypyrrole (PPy)-based films was examined in a 50% relative humidity and oxygen free atmosphere for 50 days. The results reveal that polymerization potential, modification of PPy with Cu(I), and treatment of PPy with water in preparation, demonstrate significant influences on the conductivity and the corresponding stability of PPy. PPy prepared at an over-oxidizing potential and treated with water for 0.5 h exhibits a serious decrease in conductivity by about 93%, whereas the Cu-modified PPy becomes more stable. This is attributed to electron transfer from Cu to the N+ of PPy. The concept of fixed and removable water adsorbed on PPy is introduced to explain the experimental results. Also, an aging mechanism involving the interaction between H2O and PPy is proposed to explain the decay in conductivity.
KW - Adsorption
KW - Conductivity
KW - Polypyrrole
KW - X-ray photoelectron spectroscopy
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U2 - 10.1016/S0022-0728(00)00510-6
DO - 10.1016/S0022-0728(00)00510-6
M3 - Article
AN - SCOPUS:0035937216
SN - 0022-0728
VL - 501
SP - 100
EP - 106
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
IS - 1-2
M1 - S0022-0728(00)00510-6
ER -