Abstract
In this work, a novel structure of 1D MoO3 nanowires wrapped by 2D hexagonal boron nitride (h-BN) was synthesized via a simple solvothermal method with subsequent annealing process for triethylamine (TEA) detection. The samples were characterized by XPS, SEM, HRTEM and N2 adsorption-desorption. Gas sensing performance test results illuminate that the typical 2 wt% h-BN/MoO3 sensor possesses an ultrahigh response (8616) toward 500 ppm TEA. The promoted sensing performance of TEA may be caused by the forming of heterojunction between h-BN and MoO3, the increased specific surface area of h-BN modification, providing a highly active sites for the adsorption of TEA gas, which greatly enhance the response of the sensor. The adsorption energy of a single oxygen molecule on MoO3 (010) surface was calculated by DFT, indicating the most stable site is the terminal oxygen position (Top O-1), with an adsorption energy of −2.075 eV. This work provides an inspiration to design highly efficient TEA gas sensor on basis of h-BN/MoO3 nanocomposites.
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