Fig. 5

a Dynamic responses of the S1–S5 NW gas sensors to 1.8 ppm acetone at their optimal operating temperature (390, 380, 350, 320, and 340 °C, respectively) and b their corresponding τres and τrec. c Dynamic responses of the S4 Pt@In2O3 core-shell NW gas sensor to different acetone concentrations at 320 °C and d its corresponding τres and τrec