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Highly sensitive photometric determination of cyanide based on selective etching of gold nanorods

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Abstract

The authors show that gold nanorods (AuNRs) are viable optical nanoprobes for the determination of cyanide ions. The method is based on the measurement of localized surface plasmon resonance (SPR) absorption which strongly depends on the width-to-height ratio of AuNRs. AuNRs are selectively etched by cyanide at the transverse faces, this leading to a decrease in the AuNR aspect ratio and resulting in a blue-shifted SPR absorption and color change from peacock blue to pink. The mechanism of selective etching of the AuNR tips was studied, and optimum conditions for etching were established. The absorption ratio of transverse to longitudinal SPR absorptions (at 538 and 640 nm, respectively) was proportional to the concentration of cyanide in the range from 1.65 nM to 0.5 mM, with a 0.5 nM detection limit. This colorimetric assay is selective, sensitive, and has been successfully applied to quantify cyanide in spiked tap, pond, and waste water.

Schematic illustration of the gold nanorod (AuNR) etching process induced by CN¯. The AuNR is capped with cetyltrimethylammonium bromide (CTAB) micelles.

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Acknowledgments

This research was financially supported by the Korea Institute of Science and Technology (2E26710, 2E26260, and 2E26300). The authors also thank the Small & Medium Business Administration of Korea (2 M34587), and the Korean Ministry of Science, ICT and Future Planning for providing financial support for this research (2 N41940).

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Authors and Affiliations

  1. Advanced Analysis Center and Green City Technology Institute, Korea Institute of Science & Technology, Hwarang-ro 14-gil 5 SeongBuk-gu, Seoul, 136-791, South Korea

    Sujin Lee, Yun-Sik Nam, Sung-Hee Choi, Yeonhee Lee & Kang-Bong Lee

  2. University of Science & Technology, 217 Gajeong-ro Yuseong-gu, Daejeon, 305-350, South Korea

    Sujin Lee, Yun-Sik Nam, Yeonhee Lee & Kang-Bong Lee

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  1. Sujin Lee
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  2. Yun-Sik Nam
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  4. Yeonhee Lee
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  5. Kang-Bong Lee
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Correspondence to Kang-Bong Lee.

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Lee, S., Nam, YS., Choi, SH. et al. Highly sensitive photometric determination of cyanide based on selective etching of gold nanorods. Microchim Acta 183, 3035–3041 (2016). https://doi.org/10.1007/s00604-016-1952-y

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  • DOI: https://doi.org/10.1007/s00604-016-1952-y

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