Charge transport and ammonia sensing properties of flexible polypyrrole nanosheets grown at air-liquid interface

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• 作者：Purushottam JhaAuthor Vitae ; Niranjan S. Ramgir ; ^{niranjanpr@yahoo.com}Author Vitae ; Preetam K. SharmaAuthor Vitae ; N. DattaAuthor Vitae ; S. KailasaganapathiAuthor Vitae ; M. KaurAuthor Vitae ; S.P. KoiryAuthor Vitae ; V. SaxenaAuthor Vitae ; A.K. ChauhanAuthor Vitae ; A.K. DebnathAuthor Vitae ; Ajay SinghAuthor Vitae ; D.K. AswalAuthor Vitae ; S.K. GuptaAuthor Vitae
• 关键词：Polymers ; Electrical characterisation ; Interfaces ; Nanostructures ; Transport properties
• 刊名：Materials Chemistry and Physics
• 出版年：2013
• 出版时间：15 June, 2013
• 年：2013
• 卷：140
• 期：1
• 页码：300-306
• 全文大小：718 K

文摘

Flexible polypyrrole nanosheets (thickness ¡«150?nm) grown at the air-liquid interface have been investigated for charge transport and NH₃ sensing application. Polypyrrole nanosheets films exhibited a uniform and dense morphology. Temperature dependent charge transport measurements revealed that the PPy films obey Mott's 3-D variable range hopping mechanism. The mobility values calculated using temperature dependent current voltage characteristics indicated them to obey Arrhenius behaviour. These films exhibited a reversible response towards NH₃ at room temperature. The sensor exhibited a sensitivity of ¡«12 % with a typical response and recovery times of 240?s and 50?min, respectively towards 50?ppm of NH₃. Raman studies indicated that there is an increase in the antisymmetrical C-N stretching upon exposure to higher concentration of NH₃ (500?ppm) and could be assigned to the interaction of NH₃ with the carbon backbone of PPy film. Our results clearly emphasize that these flexible PPy films could be used to realize flexible sensors.