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<p>This review article summarises different schemes for the synthesis of colloidal silver nanoparticles (NPs) by citrate reduction techniques with the perspective of quantitative detection of bio-molecules by studying localized surface plasmon resonance (LSPR). Colloidal Ag NPs are especially important owing to their sustainable LSPR which occurs because of the localization of the electric field within the fine metallic NPs. LSPR can be regulated by controlling physical parameters of NPs like shape, size, orientation and surface coating. By studying the LSPR behavior of Ag NPs in the manifestation of organic/bio-molecules, qualitative/quantitative detection is possible with very high sensitivity and precision. In the first part of this article, the surface plasmon properties of Ag NPs, based on size and shape, have been discussed. Synthesis of colloidal Ag NPs by the citrate reduction method and reports of LSPR based sensing of bio-molecules using colloidal Ag NPs have been presented in the subsequent part. </p>

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Plasmon-based bio-molecular sensor using colloidal Ag nanoparticles

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Indrani Guha,
  • Sovan Kumar Panda

摘要

This review article summarises different schemes for the synthesis of colloidal silver nanoparticles (NPs) by citrate reduction techniques with the perspective of quantitative detection of bio-molecules by studying localized surface plasmon resonance (LSPR). Colloidal Ag NPs are especially important owing to their sustainable LSPR which occurs because of the localization of the electric field within the fine metallic NPs. LSPR can be regulated by controlling physical parameters of NPs like shape, size, orientation and surface coating. By studying the LSPR behavior of Ag NPs in the manifestation of organic/bio-molecules, qualitative/quantitative detection is possible with very high sensitivity and precision. In the first part of this article, the surface plasmon properties of Ag NPs, based on size and shape, have been discussed. Synthesis of colloidal Ag NPs by the citrate reduction method and reports of LSPR based sensing of bio-molecules using colloidal Ag NPs have been presented in the subsequent part.