二维碳化钛/氧化锌纳米颗粒的制备及其乙醇气敏性能研究

doi:10.19964/j.issn.1006-4990.2023-0511

Abstract

Abstract:

Zinc oxide nanoparticles（ZnO NPs） and two⁃dimensional layered titanium carbide（Ti₃C₂T _x ） were synthesized via hydrothermal method and liquid phase chemical etching，respectively.Titanium carbide/zinc oxide（Ti₃C₂T _x /ZnO） composites 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 uniformly distributed on the surface of Ti₃C₂T _x 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 exhibited excellent sensing performance towards ethanol gas.At an optimal operating temperature of 250 ℃，M/ZNPS1（with a Ti₃C₂T _x mass fraction of 6.25%） displayed a sensitivity（R_a/R_g=11.27） to ethanol at a volume fraction of 0.01%，which was 8.8 times higher than that of pure Ti₃C₂T _x alone（R_a/R_g=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 Ti₃C₂T _x /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.

Key words: titanium carbide/zinc oxide composites, electrostatic self?assembly, ethanol gas?sensitive sensor, sensitive mechanism

CLC Number:

TP212.2

LI Zhao, YIN Youyou, LIU Chenhui, WANG Fang, GAO Jiyun. Study on preparation of two⁃dimensional titanium carbide/zinc oxide nanoparticles and their ethanol gas sensitive properties[J]. Inorganic Chemicals Industry, 2024, 56(8): 33-39.

Figures/Tables 10

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Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of two⁃dimensional titanium carbide/zinc oxide nanoparticles and their ethanol gas sensitive properties

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