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

Purushottam Jha, Niranjan S. Ramgir, Preetam K. Sharma, N. Datta, S. Kailasaganapathi, M. Kaur, S. P. Koiry, V. Saxena, A. K. Chauhan, A. K. Debnath, Ajay Singh, D. K. Aswal, S. K. Gupta

Research output: Contribution to journalArticle

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Abstract

Flexible polypyrrole nanosheets (thickness ∼150 nm) grown at the air-liquid interface have been investigated for charge transport and NH 3 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.

LanguageEnglish
Pages300-306
Number of pages7
JournalMaterials Chemistry and Physics
Volume140
Issue number1
DOIs
Publication statusPublished - 15 Jun 2013

Fingerprint

liquid air
Nanosheets
polypyrroles
Polypyrroles
Ammonia
Charge transfer
ammonia
Liquids
Air
sensors
Sensors
Current voltage characteristics
Temperature
Stretching
Carbon
recovery
polypyrrole
Recovery
temperature
carbon

Keywords

  • Polymers Electrical characterisation Interfaces Nanostructures Transport properties

Cite this

Jha, Purushottam ; Ramgir, Niranjan S. ; Sharma, Preetam K. ; Datta, N. ; Kailasaganapathi, S. ; Kaur, M. ; Koiry, S. P. ; Saxena, V. ; Chauhan, A. K. ; Debnath, A. K. ; Singh, Ajay ; Aswal, D. K. ; Gupta, S. K. / Charge transport and ammonia sensing properties of flexible polypyrrole nanosheets grown at air-liquid interface. In: Materials Chemistry and Physics. 2013 ; Vol. 140, No. 1. pp. 300-306.
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Jha, P, Ramgir, NS, Sharma, PK, Datta, N, Kailasaganapathi, S, Kaur, M, Koiry, SP, Saxena, V, Chauhan, AK, Debnath, AK, Singh, A, Aswal, DK & Gupta, SK 2013, 'Charge transport and ammonia sensing properties of flexible polypyrrole nanosheets grown at air-liquid interface', Materials Chemistry and Physics, vol. 140, no. 1, pp. 300-306. https://doi.org/10.1016/j.matchemphys.2013.03.040

Charge transport and ammonia sensing properties of flexible polypyrrole nanosheets grown at air-liquid interface. / Jha, Purushottam; Ramgir, Niranjan S.; Sharma, Preetam K.; Datta, N.; Kailasaganapathi, S.; Kaur, M.; Koiry, S. P.; Saxena, V.; Chauhan, A. K.; Debnath, A. K.; Singh, Ajay; Aswal, D. K.; Gupta, S. K.

In: Materials Chemistry and Physics, Vol. 140, No. 1, 15.06.2013, p. 300-306.

Research output: Contribution to journalArticle

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T1 - Charge transport and ammonia sensing properties of flexible polypyrrole nanosheets grown at air-liquid interface

AU - Jha, Purushottam

AU - Ramgir, Niranjan S.

AU - Sharma, Preetam K.

AU - Datta, N.

AU - Kailasaganapathi, S.

AU - Kaur, M.

AU - Koiry, S. P.

AU - Saxena, V.

AU - Chauhan, A. K.

AU - Debnath, A. K.

AU - Singh, Ajay

AU - Aswal, D. K.

AU - Gupta, S. K.

PY - 2013/6/15

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AB - Flexible polypyrrole nanosheets (thickness ∼150 nm) grown at the air-liquid interface have been investigated for charge transport and NH 3 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.

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