Liu Chengbin, Hao Sibei, Chen Xiaoyan, Zong Boyang, Mao Shun
College of Environmental Science and Engineering, Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
ACS Appl Mater Interfaces. 2020 Jul 22;12(29):32970-32978. doi: 10.1021/acsami.0c09921. Epub 2020 Jul 9.
MXenes, a group of emerging two-dimensional (2D) transition metal carbides or nitrides, have attracted wide interest due to their unique structures and properties. Their stability and applicability in different media especially in an alkaline environment are directly associated with their potential applications and are not yet explored. Herein, a field-effect transistor (FET) is fabricated with single/double-layer TiCT MXene. The TiCT FET indicator shows a fast (∼1 s), sensitive, and selective response to alkali. Moreover, the device can work even in a high-salinity (2 M NaCl) environment, suggesting its high anti-interference ability for alkali in a high-ionic-strength environment. Using an in situ morphological image evolution study, it is demonstrated that the response signal results from alkali-induced denaturation of TiCT nanosheets. The TiCT-based alkali FET indicator and systematic evaluation on alkali-induced structure evolution of TiCT provide essential insights into MXene-based FETs and future applications of MXene in alkaline environments.
MXenes是一类新兴的二维（2D）过渡金属碳化物或氮化物，因其独特的结构和性质而备受关注。它们在不同介质中，特别是在碱性环境中的稳定性和适用性与其潜在应用直接相关，目前尚未得到充分探索。在此，用单层/双层TiCT MXene制备了一种场效应晶体管（FET）。TiCT FET指示剂对碱表现出快速（约1秒）、灵敏且选择性的响应。此外，该器件即使在高盐度（2 M NaCl）环境中也能工作，表明其在高离子强度环境中对碱具有高抗干扰能力。通过原位形态图像演变研究表明，响应信号是由碱诱导的TiCT纳米片变性产生的。基于TiCT的碱FET指示剂以及对碱诱导的TiCT结构演变的系统评估，为基于MXene的FET以及MXene在碱性环境中的未来应用提供了重要见解。
