Fig. 11. (a) Dynamic response curves of typical 3DOM samples to different concentrations of ethanol at 250 °C. (b) Schematic diagram of ethanol sensing on the surface of pure and In-doped 3DOM ZnO. Reproduced with permission.113 Copyright 2016, American Chemical Society. (c) Morphologies and microstructure of 3DOM ZnO–CuO arrays. (d) Acetone responses of S1–S5 ZnO–CuO 3DOM sensors as a function of the working temperature; here, Zn/Cu atomic ratios are 1 : 0, 3 : 1, 1 : 1, 1 : 3, and 0 : 1 and marked as samples S1–S5, respectively. (e) Schematic illustration of p–n-junction-enhanced sensing mechanism. (f) Response of S3 ZnO–CuO 3DOM sensor to very low acetone concentration under ∼93.5% RH. Reproduced with permission.114 Copyright 2015, Elsevier Ltd.
