▎ 摘　　要

While the chemical vapor deposition method has important advantages for obtaining monolayer graphene, the chemical reduction technique is still one of the preferred methods in terms of involving a relatively non-expensive production process. One of the critical points in the graphene oxide chemical reduction stage is the choice of reducing material, which is important in terms of environmental issues to choose greener reducers instead of carcinogenic materials such as hydrazine. In this study, orthogonal experiments L-9(3(2)) were designed for the evaluation of ascorbic acid and sodium borohydride as reducing agents. The main aim of this study was to assess the effect of temperature and pH on the reduction performances of ascorbic acid and sodium borohydride using the TOPSIS-based Taguchi method. The improvement rates were obtained with the use of ascorbic acid as 220.77%, 58.33%, 81.96%, and 50.68% for carbon-to-oxygen ratio, D peak-to-G peak, surface area, and, crystalline size respectively. The improvement ratios were also calculated as 323.59%, 72.72%, 120.05%, and 48.42%, respectively for carbon-to-oxygen ratio, D peak-to-G peak, surface area, and, crystalline size for sodium borohydride reduction. Ascorbic acid should be preferred especially when a greener and more sustainable production is considered. (C) 2022 Elsevier B. V. All rights reserved.