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Highly sensitive and selective visual detection of Cr(VI) ions based on etching of silver-coated gold nanorods

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dc.contributor.authorKim, Dasom-
dc.contributor.authorChoi, Eunjin-
dc.contributor.authorLee, Chaedong-
dc.contributor.authorChoi, Yejung-
dc.contributor.authorKim, Hoonsub-
dc.contributor.authorYu, Taekyung-
dc.contributor.authorPiao, Yuanzhe-
dc.identifier.citationNano Convergence, 6(1):34ko_KR
dc.description.abstractWe report a visual detection of Cr(VI) ions using silver-coated gold nanorods (AuNR@Ag) as sensing probes. Au NRs were prepared by a seed-mediated growth process and AuNR@Ag nanostructures were synthesized by growing Ag nanoshells on Au NRs. Successful coating of Ag nanoshells on the surface of Au NRs was demonstrated with TEM, EDS, and UV–vis spectrometer. By increasing the overall amount of the deposited Ag on Au NRs, the localized surface plasmon resonance (LSPR) band was significantly blue-shifted, which allowed tuning across the visible spectrum. The sensing mechanism relies on the redox reaction between Cr(VI) ions and Ag nanoshells on Au NRs. As the concentration of Cr(VI) ions increased, more significant red-shift of the longitudinal peak and intensity decrease of the transverse peak could be observed using UV–vis spectrometer. Several parameters such as concentration of CTAB, thickness of the Ag nanoshells and pH of the sample were carefully optimized to determine Cr(VI) ions. Under optimized condition, this method showed a low detection limit of 0.4 μM and high selectivity towards Cr(VI) over other metal ions, and the detection range of Cr(VI) was tuned by controlling thickness of the Ag nanoshells. From multiple evaluations in real sample, it is clear that this method is a promising Cr(VI) ion colorimetric sensor with rapid, sensitive, and selective sensing ability.ko_KR
dc.description.sponsorshipThis research was supported under the framework of Nano Material Technology Development Program (NRF-2015M3A7B6027970) and Basic Science Research Program (NRF-2018R1D1A1B07051249) by National Research Foundation, South Korea. Also, this work was supported by the Center of Integrated
Smart Sensors funded by the Ministry of Science, ICT and Future Planning, South Korea, as Global Frontier Project (CISS-012M3A6A6054186)
dc.publisherSpringer Openko_KR
dc.subjectGold nanorod-
dc.subjectSilver shell coating-
dc.subjectChromium ion sensing-
dc.subjectColorimetric sensor-
dc.titleHighly sensitive and selective visual detection of Cr(VI) ions based on etching of silver-coated gold nanorodsko_KR
dc.citation.journaltitleNano Convergenceko_KR
dc.rights.holderThe Author(s)-
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