Polyhedral silver clusters as single molecule ammonia sensor based on charge transfer-induced plasmon enhancement

• Published in: Chinese physics B Vol. 32; no. 1; pp. 17302 - 507
• Main Authors: Chen, Jiu-Huan, Cheng, Xin-Lu
• Format: Journal Article
• Language: English
• Published: Chinese Physical Society and IOP Publishing Ltd 01.01.2023; Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China%Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China; Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610065, China
• Subjects: Ag clusters; ammonia; plasmon; tunneling current spectrum; ammonia; Ag clusters; plasmon; tunneling current spectrum
• ISSN: 1674-1056
• DOI: 10.1088/1674-1056/ac6daf

The unique plasmon resonance characteristics of nanostructures based on metal clusters have always been the focus of various plasmon devices and different applications. In this work, the plasmon resonance phenomena of polyhedral silver clusters under the adsorption of NH 3 , N 2 , H 2 , and CH 4 molecules are studied by using time-dependent density functional theory. Under the adsorption of NH 3 , the tunneling current of silver clusters changes significantly due to the charge transfer from NH 3 to silver clusters. However, the effects of N 2 , H 2 , and CH 4 adsorption on the tunneling current of silver clusters are negligible. Our results indicate that these silver clusters exhibit excellent selectivities and sensitivities for NH 3 detection. These findings confirm that the silver cluster is a promising NH 3 sensor and provide a new method for designing high-performance sensors in the future.