DMMP gas sensing behavior of ZnO-coated single-wall carbon nanotube network sensors

ZnO-coated single-wall carbon nanotube (ZnO–SWNT) network sensors were fabricated by forming a SWNT network on the Pt electrode patterned SiO2/Si substrate using a spin coating and depositing the ZnO nanoparticles on the SWNT network using rf magnetron sputtering, and their dimethyl methylphosphonate (DMMP) sensing properties were investigated. ZnO nanoparticles of 7–8 nm size were successfully deposited on SWNTs and their surface coverage was controlled by the deposition time. The ZnO–SWNT network sensors stably and reversibly responded to DMMP even at room temperature. In addition to low temperature detection, the response behavior of network sensors was changed from p-type to n-type with deposition time.

► ZnO-coated SWNT network sensors were fabricated using spin coating and sputtering.
► ZnO–SWNT network sensors stably and reversibly responded to DMMP gas even at room temperature.
► The response behavior of network sensors was changed from p-type to n-type with deposition time.