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In situ real time monitoring of hygroscopic properties of graphene oxide and reduced graphene oxide

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Abstract

Graphene oxide (GO) and reduced graphene oxide (RGO) has gained much attention in the field of gas sensing. However to realize its full potential in this regard, it is important to understand the influence of moisture on GO and RGO. Therefore, in situ and real time monitoring of adsorption and desorption of water molecules on GO and RGO coatings were investigated using quartz crystal microbalance (QCM). Water adsorption were studied under constant relative humidity (RH) levels over a period of time. For both GO and RGO the results show that the adsorption is followed by an equilibrium state. It is shown that for GO the initial rate of water adsorption, the amount of water at the equilibrium and the time to reach the equlibrium vary with RH, where as for RGO no such variations were observed. These observations indicate that at low RH adsorption is primarily throught surface and the edges where as at high RHs water penetrate into the intersitial layers of GO. Thus the latter becoming the rate limiting step for water adsorption at high RH. The results also elucidate on the contribution of surface oxygen functional groups towards the water adsorption rate and the amount adsorbed. The above results provde important information that can be used during GO-based sensor design and calibration.

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Acknowledgements

This work was supported by the National Research Council Sri Lanka (NRC Grant 15-04) and University of Colombo (University Grant AP/03/02/2016/CG/29 and undergraduate research funding). The authors would also like to acknowledge Mr. G. D. D. S Gamage of University of Peradeniya, Sri Lanka, for his support on Scanning Electron Microscope. We are also grateful to the Instrument Center of University of Sri Jayewardenepura, Sri Lanka and Techno Solutions (Pvt) Ltd, Sri Lanka, for the instrumentation facilities.

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Correspondence to Dilushan R. Jayasundara.

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Perera, V.V., Fernando, N.L., Nissanka, B. et al. In situ real time monitoring of hygroscopic properties of graphene oxide and reduced graphene oxide. Adsorption 25, 1543–1552 (2019). https://doi.org/10.1007/s10450-019-00131-4

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  • DOI: https://doi.org/10.1007/s10450-019-00131-4

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