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Plasmonic Semiconductor Nanocrystals as Chemical Sensors: Pb2+ Quantitation via Aggregation-Induced Plasmon Resonance Shift

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Abstract

We demonstrate, for the first time, the use of plasmonic semiconductor nanocrystals for the analysis of heavy metal ions in water. This highly sensitive localized surface plasmon resonance (LSPR)-based platform is built on glutathione (GSH) capped Cu2−xS nanocrystals, which exhibit LSPR at near infrared (NIR) wavelengths. Aggregation of GSH-capped Cu2−x S occurs specifically in the presence of lead ions, Pb2+, producing a shift in the LSPR absorbance peak. Under optimal assay conditions, the detection limit was as low as 0.25 μM (52.5 ppb) of Pb2+. This provides a new plasmonic semiconductor nanocrystal-based assay for the detection of environmentally hazardous materials. The assay employs non-toxic and earth-abundant elements and could potentially be produced at much lower cost than similar gold nanoparticle-based assays.

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Acknowledgments

This work was supported by the startup fund of the International Joint Research Center for Nanophotonics and Biophotonics and by Hong Kong Polytechnic University (Project Grant G-UB37).

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Authors and Affiliations

  1. School of Science, Changchun University of Science and Technology, Changchun, 130022, Jilin, China

    Moran Guo, Hongxin Cai, Liwei Liu & Xihe Zhang

  2. The Institute for Lasers, Photonics and Biophotonics (ILPB), The State University of New York at Buffalo, Buffalo, NY, 14260, USA

    Moran Guo, Wing-Cheung Law, Xin Liu, Liwei Liu, Mark T. Swihart & Paras N. Prasad

  3. Department of Chemical and Biological Engineering, The State University of New York at Buffalo, Buffalo, NY, 14260, USA

    Xin Liu & Mark T. Swihart

  4. Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hong Kong, People’s Republic of China

    Wing-Cheung Law

Authors
  1. Moran Guo
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  2. Wing-Cheung Law
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  3. Xin Liu
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  4. Hongxin Cai
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  5. Liwei Liu
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  6. Mark T. Swihart
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  7. Xihe Zhang
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  8. Paras N. Prasad
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Corresponding authors

Correspondence to Mark T. Swihart, Xihe Zhang or Paras N. Prasad.

Additional information

Moran Guo, Wing-Cheung Law, and Xin Liu contributed equally to this work.

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Guo, M., Law, WC., Liu, X. et al. Plasmonic Semiconductor Nanocrystals as Chemical Sensors: Pb2+ Quantitation via Aggregation-Induced Plasmon Resonance Shift. Plasmonics 9, 893–898 (2014). https://doi.org/10.1007/s11468-014-9694-3

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  • DOI: https://doi.org/10.1007/s11468-014-9694-3

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