Jeongwon Kim Various methods are used to reduce graphene oxide (GO) to reduced graphene oxide (rGO), each with its own advantages and disadvantages.
Thermal reduction removes most oxygen-containing groups but may damage the structure of rGO.
UV reduction directly acts on unstable oxygen-containing groups but may require a long time and high light intensity.
Chemical reduction uses reducing agents like ascorbic acid, sodium borohydride, or hydrazine, but some may be toxic or expensive.
To obtain a dried, highly reduced rGO from a graphene oxide solution, choose a suitable reducing agent, add it to the GO solution, heat it to a moderate temperature, filter and wash the rGO, and dry it at a low temperature.
References:
Guex, L. G., Sacchi, B., Peuvot, K. F., Andersson, R. L., Pourrahimi, A. M., Ström, V., ... & Olsson, R. T. (2017). Experimental review: chemical reduction of graphene oxide (GO) to reduced graphene oxide (rGO) by aqueous chemistry. Nanoscale, 9(27), 9562-9571.
Kumar, N., Setshedi, K., Masukume, M., & Ray, S. S. (2022). Facile scalable synthesis of graphene oxide and reduced graphene oxide: Comparative investigation of different reduction methods. Carbon Letters, 32(4), 1031-1046.
Xiang, X., Zhu, Y., Gao, C., Du, H., & Guo, C. (2022). Study on the structure of reduced graphene oxide prepared by different reduction methods. Carbon Letters, 1-10.
Dasgupta, A., Sarkar, J., Ghosh, M., Bhattacharya, A., Mukherjee, A., Chattopadhyay, D., & Acharya, K. (2017). Green conversion of graphene oxide to graphene nanosheets and its biosafety study. PloS one, 12(2), e0171607.
In addition to the helpful answer by Alvena Shahid, reduction of GO via diilute HCl and Aluminum powder is simple, effective and quick. Please see Article An environmentally friendly and efficient route for the redu...