Physicochemical regulations of nanoconfined two-dimensional spacing toward highly-selective NH3 sensing
image: A high-performance NH3 sensing material was designed by annealing and ion intercalation of multilayer Ti3C2. Compared with Ti3C2, the modified material has significantly improved selectivity, sensitivity, and response time towards NH3.
Credit: Nano research, Tsinghua University Press
The study unveiled a novel regulation strategy that exhibits exceptional performance in gas sensing applications. This advanced material demonstrates outstanding selectivity, rapid response, and ultrahigh sensitivity, particularly in detecting ammonia (NH₃) molecules. The research, led by a team from East China University of Science and Technology, provides new insights into the gas sensing mechanisms of MXenes and introduces a synergistic strategy to optimize their performance.
Key Findings:
The study reveals that reducing the interlayer spacing of the MXene material significantly enhances its response speed. This phenomenon is attributed to a pump-like mechanism at the nanoscale, which allows NH₃ molecules to be rapidly absorbed and diffused across the interlayer spaces. While the narrower spacing accelerates the response time, it does not necessarily increase sensitivity, highlighting the complex interplay between material structure and performance.
Implications:
This discovery not only advances the understanding of MXene-based gas sensing mechanisms but also paves the way for the development of next-generation sensors with applications in environmental monitoring, industrial safety, and healthcare. The material’s ultrahigh sensitivity and rapid response make it a promising candidate for real-time detection of hazardous gases.
Research Team:
The project was spearheaded by Dr. T.C., Dr. X.M., and Dr. L.L., who contributed equally to the work. The team also included Dr. B.Z. and Prof. F.Z.X., who supervised the project. The collaborative effort involved experimental work, theoretical computations, and manuscript preparation, with all authors contributing to the analysis and discussion of the results.
Funding and Support:
This research was supported by the National Natural Science Foundation of China (Grants No. 52422505 and 12274124) and the Innovative Research Group Project of the National Natural Science Foundation of China (Grant No. 52321002). The team also acknowledged the support of Dr. Yanyan Jia and Prof. Sheng Dai at the Feringa Nobel Prize Scientist Joint Research Center for their assistance in TEM characterization.
About Nano Research
Nano Research is a peer-reviewed, open access, international and interdisciplinary research journal, sponsored by Tsinghua University and the Chinese Chemical Society, published by Tsinghua University Press on the platform SciOpen. It publishes original high-quality research and significant review articles on all aspects of nanoscience and nanotechnology, ranging from basic aspects of the science of nanoscale materials to practical applications of such materials. After 18 years of development, it has become one of the most influential academic journals in the nano field. Nano Research has published more than 1,000 papers every year from 2022, with its cumulative count surpassing 7,000 articles. In 2024 InCites Journal Citation Reports, its 2024 IF is 9.0 (8.7, 5 years), and it continues to be the Q1 area among the four subject classifications. Nano Research Award, established by Nano Research together with TUP and Springer Nature in 2013, and Nano Research Young Innovators (NR45) Awards, established by Nano Research in 2018, have become international academic awards with global influence.