Study on preparation of two-dimensional titanium carbide/zinc oxide nanoparticles and their ethanol gas sensitive properties
Zinc oxide nanoparticles(ZnO NPs)and two-dimensional layered titanium carbide(Ti3C2Tx)were synthesized via hydrothermal method and liquid phase chemical etching,respectively.Titanium carbide/zinc oxide(Ti3C2Tx/ZnO)compos-ites with varying mass ratios were prepared using electrostatic self-assembly technology.Gas-sensitive sensing films were fabricated through screen printing and their gas sensitive properties were studied.The composite structure was characterized by X-ray powder diffraction(XRD)and scanning electron microscopy(SEM).The results showed that ZnO NPs were uni-formly distributed on the surface of Ti3C2Tx with a two-dimensional accordion shape and interspersed between layers.In the detection of five typical VOCs gases including ethanol,acetone,methanol,formaldehyde,and toluene,the composite exhib-ited excellent sensing performance towards ethanol gas.At an optimal operating temperature of 250℃,M/ZNPS1(with a Ti3C2Tx mass fraction of 6.25%)displayed a sensitivity(Ra/Rg=11.27)to ethanol at a volume fraction of 0.01%,which was 8.8 times higher than that of pure Ti3C2Tx alone(Ra/Rg=1.28).Furthermore,it demonstrated exceptional response/recovery time characteristics(4 s/8 s),as well as remarkable selectivity and long-term stability.The gas-sensitive mechanism of Ti3C2Tx/ZnO composites was discussed from the point of view of carrier transport between electrodes,which had a potential application prospect for low concentration ethanol gas.
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维普
