| Summary: | A representative of titanium carbide MXene, Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> is a promising candidate for high performance gas sensing and has attracted significant attention. However, MXene naturally has a multilayer structure with low porosity, which prevents its gas-sensing activity. Zinc oxide (ZnO) has long been utilized as a gas detector. Despite its good response to multiple gases, high operation temperature has limited its widespread use as a gas-sensing material. In this study, a room-temperature toxic gas sensor was prepared from ZnO/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene nanocomposite consisting of 2D few-layered MXene and 1D ZnO nanoparticles. A simple technique for synthesizing the nanocomposite was established. The physicochemical properties of the nanocomposite were fine-controlled with more active sites and higher porosity. The sensitivity and gas-selectivity of the sensing material were closely examined. The nanocomposite showed enhanced response and recovery behaviors to toxic gases, which outperformed pure Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene and pure ZnO. This study offers a practical strategy by which to increase the gas-sensing performance of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene, and expands comprehensive understanding of the gas-sensing process of ZnO/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> p-n heterostructure.
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