https://doi.org/10.1051/epjap/2012110384
Study of ultrathin film of gold nanocomposite polyaniline for CO2 and NH3 gas sensing properties
1
CSIR-North-East Institute of Science & Technology, Jorhat 785006, Assam, India
2
Department of Physics, Gauhati University, Guwahati 781014, Assam, India
a e-mail: pratap_sarmah@yahoo.com
Received:
29
September
2011
Revised:
20
July
2012
Accepted:
17
September
2012
Published online:
23
October
2012
To study the gas sensing properties for CO2 and NH3 gas, powdered gold nanocomposite polyaniline was chemically synthesized and ultrathin films were fabricated. XRD spectra of these samples indicate the polycrystalline nature of the film. UV-vis spectra showed peak at 3.8 eV corresponding to π-π* transition. The relative sensitivities of the gas to air were around 70 and 530 for CO2 and NH3 gas respectively. Temperature variation of gas conductivity showed the increase of conductivity of the films up to about 42 °C and then decreased for small change of temperature. Recovery time for the sample was 54 s.
© EDP Sciences, 2012
