Novel composite of α-MoO3/BiVO4 for Triethylamine selective detection
The one-dimensional α-MoO3 nanorods were synthesized by hydrothermal method and then BiVO4 nanoparticles were grown directly on α-MoO3 nanorods using a simple metal organic decomposition process to construct the α-MoO3/BiVO4 composite with heterojunction for fabrication of a rapid response sensor to triethylamine (TEA). The morphology and structure of the composite were characterized by various spectral techniques and the sensing properties of the sensor to TEA were investigated by resistance measurement. The results showed that the response of 16Mo/Bi composite to 20 ppm TEA is 1.86 times and 15 times higher that of α-MoO3 and BiVO4 at an optimum operating temperature of 125 °C, respectively. The enhancement can be ascribed to the existence of heterojunction between α-MoO3 and BiVO4, which creates an additional barrier at interface of heterojunction increasing the resistance of the composite in air and decreasing the resistance in TEA, thus enhances the response of the composite to TEA.