Abstract
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<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> samples are prepared by etching Ti<sub>3</sub>AlC<sub>2</sub> 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<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> 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<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> material. The results of gas sensing properties show that the gas sensing properties of Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> prepared by LiF/HCl etching agent is better than by HF etching agent, and the wide range, high sensitivity and high stability of NH<sub>3</sub> detection can be achieved at room temperature. The analysis shows that the high sensing performance of Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> prepared by LiF/HCl solution etching is mainly due to the high proportion of —O and —OH functional groups on the surface of Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>. The experimental studies can lay a theoretical foundation for studying the gas sensing and practical application of Ti<sub>3</sub>C<sub>2</sub>T<i><sub>x</sub></i> based sensor.
Highlights
The analysis shows that the high sensing performance of Ti3C2Tx prepared by LiF/HCl solution etching is mainly due to the high proportion of —O and —OH functional groups on the surface of Ti3C2Tx
(Taiyuan University of Technology, College of information and computer, MicroNano System Research Center, Taiyuan 030600, China) ( Received 2 June 2021; revised manuscript received 5 September 2021 )
Summary
MXene 材料主要通过 HF 溶 液 、 氟 化 锂 和 盐酸混合液、强碱等溶液来选择性刻蚀 MAX相中 的 A 原子层的方法得到. 随着对制备 MXene 材料 研究的进一步深入 , 氟化盐溶液 [13]、 NH4HF2 溶 液 [14]、二元水体系无氟溶液 [15] 等刻蚀剂也被用于 MXene 材料的制备. 本文中, Ti3C2Tx 材料的前驱. MXene 材料主要通过 HF 溶 液 、 氟 化 锂 和 盐酸混合液、强碱等溶液来选择性刻蚀 MAX相中 的 A 原子层的方法得到. 随着对制备 MXene 材料 研究的进一步深入 , 氟化盐溶液 [13]、 NH4HF2 溶 液 [14]、二元水体系无氟溶液 [15] 等刻蚀剂也被用于 MXene 材料的制备. 体为 Ti3AlC2, 通过 HF 溶液和 LiF/HCl 混合溶液 将 Ti3AlC2 中的 Al 原子从外表面移除, 进而获得 Ti3C2Tx 材料
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