Journal article

Thermally reduced graphene oxide showing n- to p-type electrical response inversion with water adsorption

AA Haidry, Z Wang, Q Fatima, A Zavabeti, L Xie, H Zhu, Z Li

Applied Surface Science | Elsevier | Published : 2020

Abstract

Graphene oxide (GO) is regarded as one of the potential candidates for gas and humidity sensor applications owing to its excellent water adsorption capabilities. However, there is a lack of understanding the response of GO to humidity. Some authors believe the water adsorption leads to p-type response while other think it to be n-type. The present work demonstrates the mechanism of water adsorption and n- to p-type response inversion of GO to humidity. The GO suspension was synthesised by modified Hummers’ method and then drop-casted onto the substrates having already patterned gold interdigital electrodes (IDE). The sensors can detect wide humidity range (5–95 %RH) with a low voltage 0.1 V ..

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University of Melbourne Researchers

Grants

Awarded by Natural Science Foundation of Jiangsu Province


Awarded by National Natural Science Foundation of China


Awarded by Central University Basic Scientific Research Business Expenses Special Funds


Awarded by Postgraduate Research and Practice Innovation Program of Jiangsu Province


Funding Acknowledgements

We thank the Funding "Natural Science Foundation of Jiangsu Province" (BK20170795), "National Natural Science Foundation of China" (51850410506) and "Central University Basic Scientific Research Business Expenses Special Funds" (NG2020002) for providing major financial support. This work was also supported "Postgraduate Research and Practice Innovation Program of Jiangsu Province" (KYCX18_0281).