Highly sensitive and selective two-photon sensing of cartap using Au@Ag core-shell nanoparticles

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• 作者：Peiyan Yuan ; Rizhao Ma ; Qinghua Xu
• 关键词：metal nanoparticles ; bio ; sensing ; two ; photon excitation ; plasmon resonance ; photoluminescence ; cartap
• 刊名：SCIENCE CHINA Chemistry
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：59
• 期：1
• 页码：78-82
• 全文大小：722 KB
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• 作者单位：Peiyan Yuan (1)
  Rizhao Ma (1)
  Qinghua Xu (1)
  
  1. Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Chinese Library of Science
  Chemistry
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1870

文摘

A highly sensitive and selective two-photon sensing scheme for detection of cartap was developed by using Au@Ag bimetallic core-shell nanoparticles. Cartap was found to induce the aggregation of Au@Ag nanoparticles and up to 700-fold enhancement in two-photon photoluminescence. Huge enhancement in two-photon photoluminescence allows achieving a detection limit of as low as 0.0062 mg/kg, which is better than the conventional colorimetric methods. This two-photon sensing scheme has a broad dynamic range and displays excellent selectivity in detection of cartap against over other ten kinds of commonly used insecticides.