NO <sub>2</sub> Gas Sensing Properties of Ag-Functionalized Porous ZnO Sheets
Min Young Kim, Jeong Yun Hwang, Ali Mirzaei, Sun‐Woo Choi, Sang‐il Kim, Hyun‐Sik Kim, Sun-Jae Kim, Jong Wook Roh, Myung Sik Choi, Kyu Hyoung Lee, Seung Yong Lee, Changhyun Jin
Abstract
Herein, we report a simple and scalable synthesis route to prepare Ag-functionalized porous ZnO sheets and their enhanced NO 2 gas sensing properties. Porous ZnO sheets functionalized with well-dispersed submicron Ag particles were prepared by using a hydrothermal method-based one-pot synthesis route from Zn and Ag precursors. NO 2 gas sensing performance (response, selectivity, response time, and recovery time) was optimized at 200°C in the gas sensor fabricated with 3 at% Ag-functionalized porous ZnO sheets. We demonstrated a response ([Formula: see text]/[Formula: see text]) of 17.18 to 10 ppm NO 2 gas and also obtained a high response of 14.05 even at 60% relative humidity due to the synergetic effect of improved NO 2 gas adsorption in the presence of Ag particles and increased resistance by the formation of Schottky barrier at Ag-ZnO heterojunctions.