Gas Sensing Properties of Reduced Graphene Oxide Modified by Copper Oxide

Multilayer Structure of Reduced Graphene Oxide and Copper Oxide as a Gas Sensor

“…Technology of single CuO layers was similar to that described in [29]. In the case of the structure investigated in this work, the thickness and density of CuO layers varied from sample to sample due to the changing concentration of the CuO solution, from which the samples were prepared.…”

“…The deposition was performed in a sequence: rGO-CuO-rGO-CuO for four LbL structures, which is schematically illustrated in Figure 2 (CuO is always on top of the sample). Graphene oxide was prepared using the modified Hummers method, as described previously in [29]. Graphite powder was treated with concentrated sulfuric acid, sodium nitrate, and potassium permanganate at a temperature around 10 °C.…”

“…These substrates were used in particular for deposition and investigation of high-resistance GO samples. Graphene oxide was prepared using the modified Hummers method, as described previously in [29]. Graphite powder was treated with concentrated sulfuric acid, sodium nitrate, and potassium permanganate at a temperature around 10 • C. After 60 min, the temperature was increased up to 30 • C and was maintained under stirring for 2 h. After adding distilled water to the mixture, the temperature was increased up to 100 • C. A small amount of hydrogen peroxide was then added after 60 min.…”

“…5 µm (Figure 3). Graphene oxide was prepared using the modified Hummers method, as described previously in [29]. Graphite powder was treated with concentrated sulfuric acid, sodium nitrate, and potassium permanganate at a temperature around 10 °C.…”