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Preparation and evaluation of Fe3O4-core@Ag-shell nanoeggs for the development of fingerprints

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Abstract

The surface of individual, relatively dispersed Fe3O4 nanospheres is coated with a thiol-terminated silane, then the thiol on the Fe3O4 particles’ surfaces treats with nano-Ag colloidal solution to form Ag-modified Fe3O4 nanoparticles. Eventually, a solid shell of Ag is capped onto the Ag-modified Fe3O4 nanoparticles by reducing aliquots of AgNO3 solution using NaBH4 as a reducing agent. The as-prepared Fe3O4-core@Ag-shell nanoeggs, which are uniform in size, highly monodisperse, stable against aggregation and have high magnetization, were depended on thin shell of the attached nano-Ag, the size of Fe3O4 nanoparticles, the volume of thiol-terminated silane as well as the ultrasonication. The Fe3O4-core@Ag-shell nanoeggs are proposed to detect fingermarks on different surface, with which the fingermarks can be viewed directly, due to the clear ridge detail.

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Authors and Affiliations

  1. College of Criminal Investigation, Southwest University of Political Science and Law, Chongqing, 401120, China

    LingYan Zhang, XiaoFeng Zhou & Ting Chu

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  1. LingYan Zhang
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  2. XiaoFeng Zhou
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  3. Ting Chu
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Correspondence to LingYan Zhang.

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Zhang, L., Zhou, X. & Chu, T. Preparation and evaluation of Fe3O4-core@Ag-shell nanoeggs for the development of fingerprints. Sci. China Chem. 56, 551–556 (2013). https://doi.org/10.1007/s11426-012-4764-x

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  • DOI: https://doi.org/10.1007/s11426-012-4764-x

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