Component-Controlled Synthesis of Small-Sized Pd-Ag Bimetallic Alloy Nanocrystals and Their Application in a Non-Enzymatic Glucose Biosensor

Authors

  • Suli Liu,

    1. Jiangsu Key Laboratory of Biofunctional Material School of Chemistry and Materials Scienc, Nanjing Normal University, Nanjing, P. R. China
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  • Can Zhang,

    1. Jiangsu Key Laboratory of Biofunctional Material School of Chemistry and Materials Scienc, Nanjing Normal University, Nanjing, P. R. China
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  • Lin Yuan,

    1. Jiangsu Key Laboratory of Biofunctional Material School of Chemistry and Materials Scienc, Nanjing Normal University, Nanjing, P. R. China
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  • Jianchun Bao,

    1. Jiangsu Key Laboratory of Biofunctional Material School of Chemistry and Materials Scienc, Nanjing Normal University, Nanjing, P. R. China
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  • Wenwen Tu,

    1. Jiangsu Key Laboratory of Biofunctional Material School of Chemistry and Materials Scienc, Nanjing Normal University, Nanjing, P. R. China
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  • Min Han,

    1. Jiangsu Key Laboratory of Biofunctional Material School of Chemistry and Materials Scienc, Nanjing Normal University, Nanjing, P. R. China
    2. State Key Laboratory of Coordination Chemistr Nanjing National Laboratory of Solid State Microstructure, Nanjing University, Nanjing, P. R. China
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  • Zhihui Dai

    Corresponding author
    • Jiangsu Key Laboratory of Biofunctional Material School of Chemistry and Materials Scienc, Nanjing Normal University, Nanjing, P. R. China
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E-mail: 07203@njnu.edu.cn, daizhihuii@njnu.edu.cn

Abstract

Small-sized monodisperse Pd-Ag alloy nanocrystals (NCs) are synthesized via a solid-liquid and solid-solid phase chemical route, i.e., sequential reduction of Pd(NO3)2 and AgNO3 solid precursors in the liquid mixture of dodecylamine and 1-octadecene, followed by fusion of formed Pd and Ag NCs at 250 °C. By controlling the addition sequence and molar ratio of the metallic precursors, a series of Pd-Ag alloy NCs, including Pd5Ag, Pd2Ag, PdAg, PdAg2, and PdAg5, is obtained. The alloy NCs are highly crystallized and exhibit a strong atomic ensemble in addition to component-dependent electronic effects. Pd2Ag NCs have unique structure and electronic properties, showing a much faster electron transfer process at a modified glassy carbon electrode interface compared with that of other alloys. Therefore, the Pd2Ag NCs are chosen as the electrocatalyst to evaluate the performance of Pd-Ag nanoalloy and a novel non-enzymatic glucose biosensor is fabricated. The biosensor exhibits an acceptable reproducibility, a good stability and low interferences, which can be used to examine glucose in clinic blood serum samples. This work provides a simple multiphasic reaction system to synthesize binary alloy NCs with well-controlled componential ratio and opens the avenue to utilize them in biosensing or other advanced technological fields.

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