中国物理B ›› 2023, Vol. 32 ›› Issue (1): 17302-017302.doi: 10.1088/1674-1056/ac6daf

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

Jiu-Huan Chen(陈九环)1 and Xin-Lu Cheng(程新路)1,2,†   

  1. 1 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;
    2 Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610065, China
  • 收稿日期:2022-03-06 修回日期:2022-04-27 接受日期:2022-05-07 出版日期:2022-12-08 发布日期:2022-12-27
  • 通讯作者: Xin-Lu Cheng E-mail:chengxl@scu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11774248 and 11974253) and the National Key Research and Development Program of China (Grant No. 2017YFA0303600).

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

Jiu-Huan Chen(陈九环)1 and Xin-Lu Cheng(程新路)1,2,†   

  1. 1 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;
    2 Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University, Chengdu 610065, China
  • Received:2022-03-06 Revised:2022-04-27 Accepted:2022-05-07 Online:2022-12-08 Published:2022-12-27
  • Contact: Xin-Lu Cheng E-mail:chengxl@scu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11774248 and 11974253) and the National Key Research and Development Program of China (Grant No. 2017YFA0303600).

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摘要： 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 NH3, N2, H2, and CH4 molecules are studied by using time-dependent density functional theory. Under the adsorption of NH3, the tunneling current of silver clusters changes significantly due to the charge transfer from NH3 to silver clusters. However, the effects of N2, H2, and CH4 adsorption on the tunneling current of silver clusters are negligible. Our results indicate that these silver clusters exhibit excellent selectivities and sensitivities for NH3 detection. These findings confirm that the silver cluster is a promising NH3 sensor and provide a new method for designing high-performance sensors in the future.

关键词: ammonia, Ag clusters, plasmon, tunneling current spectrum

Abstract: 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 NH3, N2, H2, and CH4 molecules are studied by using time-dependent density functional theory. Under the adsorption of NH3, the tunneling current of silver clusters changes significantly due to the charge transfer from NH3 to silver clusters. However, the effects of N2, H2, and CH4 adsorption on the tunneling current of silver clusters are negligible. Our results indicate that these silver clusters exhibit excellent selectivities and sensitivities for NH3 detection. These findings confirm that the silver cluster is a promising NH3 sensor and provide a new method for designing high-performance sensors in the future.

Key words: ammonia, Ag clusters, plasmon, tunneling current spectrum

中图分类号:  (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

  • 73.20.Mf
71.45.Gm (Exchange, correlation, dielectric and magnetic response functions, plasmons) 78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters)