Abstract
The combination with RuO2 nanoparticles will be an ideal method to enhance the sensing performance of MoO3. In this article, the nanocomposite of MoO3 and RuO2 with heterojunction was synthesized by a convenient soaking method, and the ingredients and nanostructures were researched through a series of characterizations. The consequences of characterization show that the diameter of MoO3@RuO2 nanocomposites and RuO2 nanoparticles are 0.8 μm and 4 nm, respectively. According to the gas sensing measurement, MoO3@RuO2 nanocomposites exhibit enhanced triethylamine (TEA) sensing performance such as lower working temperature (260 °C), higher response (12.8–1 ppm TEA), short response time and recovery time (2/10 s) and better selectivity (response to ammonia, trimethylamine, ethanol, methanol, acetone). The enhanced performance of RuO2 nanoparticles-functionalized MoO3 nanobelts sensor could be attributed to the variation of electron depletion layer due to the formation of RuO2/MoO3 Schottky junctions and the promotion of more adsorption sites for TEA gas molecule on the surface of MoO3 nanobelts.
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