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Since the discovery of graphene materials, two-dimensional materials have been widely recognized and gradually applied. Two-dimensional transition metal carbides (MXenes) have better mechanical, magnetic and electrical properties than traditional two-dimensional materials. In this work, Ti 3 C 2 T  x   samples are prepared by etching Ti 3 AlC 2  with different etching agents for the solutions of HF and LiF/HCl. The effects of etching agents on the structure and gas sensing properties of Ti 3 C 2 T  x   materials are studied by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and gas sensing properties analysis. The material structure analysis shows that both HF and LiF/HCl etching agents have good etching effect on Ti 3 C 2 T  x   material. The results of gas sensing properties show that the gas sensing properties of Ti 3 C 2 T  x   prepared by LiF/HCl etching agent is better than by HF etching agent, and the wide range, high sensitivity and high stability of NH 3  detection can be achieved at room temperature. The analysis shows that the high sensing performance of Ti 3 C 2 T  x   prepared by LiF/HCl solution etching is mainly due to the high proportion of —O and —OH functional groups on the surface of Ti 3 C 2 T  x  . The experimental studies can lay a theoretical foundation for studying the gas sensing and practical application of Ti 3 C 2 T  x   based sensor.

wuli xuebao

Preparation and gas sensing properties of a novel two-dimensional material Ti&lt;sub&gt;3&lt;/sub&gt;C&lt;sub&gt;2&lt;/sub&gt;T&lt;sub&gt;&lt;i&gt;x &lt;/i&gt;&lt;/sub&gt;MXene