One-dimensional variable range charge carrier hopping in polyaniline–tungsten oxide nanocomposite-based hydrazine chemiresistor
Low-temperature direct current charge transport mechanism of charge carriers in polyaniline–tungsten oxide (PAN-WO 3 ) nanocomposite has been investigated. Charge transport in pristine PAN was found to govern by Mott’s three-dimensional variable range hopping (3-D VRH) model. However, the inclusion...
Saved in:
Published in | Applied physics. A, Materials science & processing Vol. 127; no. 7 |
---|---|
Main Author | |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.07.2021
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Low-temperature direct current charge transport mechanism of charge carriers in polyaniline–tungsten oxide (PAN-WO
3
) nanocomposite has been investigated. Charge transport in pristine PAN was found to govern by Mott’s three-dimensional variable range hopping (3-D VRH) model. However, the inclusion of WO
3
in nanocomposite shifts the dimension of hopping from 3-D to 1-D. The room-temperature conductivity of PAN-WO
3
nanocomposite (5.55 × 10
–3
S/cm) was also found to be enhanced compared to pristine PAN (1.27 × 10
–5
S/cm). The reasons for crossover in hopping dimensionality and enhanced conductivity of PAN-WO
3
nanocomposite have been explained in terms of Mott’s parameters, i.e., small hopping radius, lower hopping energy, high inter-chain distance, and prominent intra-chain transport. Furthermore, PAN-WO
3
exhibited enhanced reversible sensing behaviour (27%) towards 10 parts per million of hydrazine at room temperature compared to that of pristine PAN (12%). Enhanced sensing characteristics of PAN-WO
3
nanocomposite can be attributed to its higher conductivity and prominent intra-chain unidirectional charge transport. Present communication opens a new window for energy-saving, eco-friendly, cost-effective, recoverable and reproducible, easily processable and efficient PAN-WO
3
nanocomposite-based hydrazine detecting device. |
---|---|
ISSN: | 0947-8396 1432-0630 |
DOI: | 10.1007/s00339-021-04690-8 |