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<p> To address the urgent requirements for fast and on-site hexavalent chromium (Cr(VI)) detection, we developed a dual-mode sensing platform integrating surface-enhanced Raman spectroscopy (SERS) and colorimetry combined with smartphone-assisted visual detection using gold-core silver-shell nanoparticles (Au@Ag NPs). The SERS mode leveraged the plasmonic enhancement of Au@Ag NPs, achieving ultrahigh sensitivity with a detection limit of 0.074&#xa0;nM and a linear range spanning five orders of magnitude. Simultaneously, the colorimetric mode utilized smartphone-assisted RGB (Red–Green–Blue) analysis to quantify Cr(VI)-induced nanoparticle etching, attaining a detection limit of 2.5&#xa0;µM, surpassing conventional colorimetric sensors. The synergy of dual-mode detection enabled cross-validated quantification: SERS for trace-level determinations&#xa0;and smartphone-based colorimetry for rapid on-site screening. This platform demonstrated exceptional selectivity against interfering ions and robust performance in real-world applications, including rice and environmental water samples, with recoveries of 98.10–104.36%. By combining nanotechnology with portable devices, our work provides a cost-effective, user-friendly, and field-deployable solution for Cr(VI) monitoring in environmental safety and food quality control.</p> Graphical Abstract <p></p>

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Dual-mode SERS and colorimetry combined with smartphone-assisted visual detection of Cr(VI) utilizing Au@Ag nanoparticles

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Ronghui Xu,
  • Lu Tan,
  • Wenwen Tian,
  • Kaili Ma,
  • Yi Zheng,
  • Ding Wang,
  • Yingping Zheng,
  • Yongbing Lou

摘要

To address the urgent requirements for fast and on-site hexavalent chromium (Cr(VI)) detection, we developed a dual-mode sensing platform integrating surface-enhanced Raman spectroscopy (SERS) and colorimetry combined with smartphone-assisted visual detection using gold-core silver-shell nanoparticles (Au@Ag NPs). The SERS mode leveraged the plasmonic enhancement of Au@Ag NPs, achieving ultrahigh sensitivity with a detection limit of 0.074 nM and a linear range spanning five orders of magnitude. Simultaneously, the colorimetric mode utilized smartphone-assisted RGB (Red–Green–Blue) analysis to quantify Cr(VI)-induced nanoparticle etching, attaining a detection limit of 2.5 µM, surpassing conventional colorimetric sensors. The synergy of dual-mode detection enabled cross-validated quantification: SERS for trace-level determinations and smartphone-based colorimetry for rapid on-site screening. This platform demonstrated exceptional selectivity against interfering ions and robust performance in real-world applications, including rice and environmental water samples, with recoveries of 98.10–104.36%. By combining nanotechnology with portable devices, our work provides a cost-effective, user-friendly, and field-deployable solution for Cr(VI) monitoring in environmental safety and food quality control.

Graphical Abstract