Liquid-Phase Growth of Nanocrystalline ZnO Thin Films and Their Gas-Sensitive Properties
Ilya A. Nagornov, Artem S. Mokrushin, Е. П. Симоненко, Н. П. Симоненко, V. G. Sevastyanov, Н. Т. Кузнецов
Abstract
Films of nanocrystalline ZnO have been synthesized in situ on specialized substrates as a result of heat treatment of zinc acetylacetonate hydrate solutions in 1-butanol and ethylene glycol. It has been found that the morphology and coating integrity significantly depend on the solvothermal synthesis solvent. Thus, in ethylene glycol medium a coating with higher integrity and smaller size of ZnO nanoparticles is formed. The ZnO film obtained by [Zn(H2O)(O2C5H7)2] destruction in ethylene glycol demonstrates, as part of a chemical gas sensor, high selectivity and sensitivity to NO2 throughout the temperature range with a maximum chemoresistive response at 250°C (the response to 4–100 ppm NO2 is in the range 2.2–103). It is shown that as the detection temperature decreases, there is a change in the response direction as a result of various surface processes.