Plasmon Peak Sensitivity Investigation of Individual Cu and Cu@Cu₂O Core–Shell Nanoparticle Sensors

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• 作者：Mingli Huang ; Yufeng Zhang ; Chaoling Du ; Sheng Peng ; Daning Shi
• 关键词：Plasmon sensor ; Refractive index ; Cu and Cu@Cu2O core–shell nanoparticles ; Mie theory
• 刊名：Plasmonics
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：11
• 期：5
• 页码：1197-1200
• 全文大小：611 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Nanotechnology
  Biophysics and Biomedical Physics
  Biochemistry
  
• 出版者：Springer US
• ISSN：1557-1963
• 卷排序：11

文摘

It is crucial to reveal the plasmon peak sensitivity responses of individual Cu nanoparticles, which provide another kind of plasmon sensors besides Au/Ag ones. In this paper, such responses to both the bulk and local refractive index (RI) of individual Cu nanosphere sensors are theoretically investigated by Mie theory. Both of them are revealed to be quadratic. The underlying mechanisms are elucidated well in terms of Rayleigh approximation. The corresponding sensitivity factors are demonstrated to increase with the RI of the nanospheres’ bulk and local surrounding mediums linearly. The plasmon peak sensitivities and sensitivity factors of experimentally encountered Cu@Cu₂O core–shell nanoparticles are calculated as well, which reveals that appropriate dielectric encapsulations to Cu nanospheres are favored for their potential plasmonic sensing and detection applications.