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Experimental evidence on RH-dependent crossover from an electronic to protonic conduction with an oscillatory behaviour

Solanki, Vanaraj and Krupanidhi, S B and Nanda, K K (2017) Experimental evidence on RH-dependent crossover from an electronic to protonic conduction with an oscillatory behaviour. In: APPLIED PHYSICS LETTERS, 110 (26).

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Official URL: http://dx.doi.org/10.1063/1.4990688

Abstract

An oxide semiconductor changes its resistance with exposure of water molecules and is accepted to be governed by electronic and protonic conduction in low and high humid atmosphere, respectively, without any experimental evidences. Here, we report on the experimental evidence of a relative humidity (RH) dependent crossover, from an electronic to protonic conduction and its oscillatory behaviour in mesoporous SnO2. Interestingly, oscillatory conduction observed in the intermediate humidity range (70%-90% RH) lies in between two monotonic variations that substantiate the competitive adsorption and desorption processes of oxygen species and water molecules. In addition, we have shown that the conduction process can be tuned predominantly electronic or protonic by pre-and post-UV treatment. The conductance increases by 2-3 orders as the conduction changes from pure electronic to protonic, suggesting an insulator-to-metal like transition. Published by AIP Publishing.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER INST PHYSICS, 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 29 Jul 2017 10:14
Last Modified: 29 Jul 2017 10:14
URI: http://eprints.iisc.ac.in/id/eprint/57517

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