Hydrothermal synthesis and gas-sensing properties of ultrathin hexagonal ZnO nano sheets

Gas-sensing performances are often enhanced significantly.once size of the sensing materials approaches a critical value of 15 nm. Here, we synthesize, by a simple hydrothermal method, ultrathin hexagonal ZnO nanosheets with a thickness of 17 nm. The cetyltrimethylammonium bromide is found to play a critical role in producing such unique hexagonal ZnO nanosheets, and a possible growth mechanism is proposed. The as-prepared ultrathin nanosheets exhibit excellent gas-sensing properties to formaldehyde gas at optimal temperature of 350 degrees C under concentration of 50 ppm, rendering the ultrathin nanosheets promising for the on-site detection of formaldehyde. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.