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Microchimica Acta

, 186:788 | Cite as

Cysteamine-capped gold-copper nanoclusters for fluorometric determination and imaging of chromium(VI) and dopamine

  • Muthaiah Shellaiah
  • Turibius Simon
  • Natesan Thirumalaivasan
  • Kien Wen SunEmail author
  • Fu-Hsiang Ko
  • Shu-Pao Wu
Original Paper
  • 147 Downloads

Abstract

Highly emissive cysteamine-capped gold-copper bimetallic nanoclusters (CA-AuCu NCs) with a quantum yield of 18% were synthesized via one-pot anti-galvanic reduction. The CA-AuCu NCs were characterized by HR-TEM, XPS, FTIR, MALDI-TOF mass spectrometry, DLS, and zeta potential analyses. The NCs are shown to be viable fluorescent probes for Cr(VI) ions and dopamine (DA) via quenching of the blue fluorescence, typically measured at excitation/emission wavelengths of 350/436 nm. During DA recognition, a dark brown color appears, which is distinguishable from that of Cr(VI) detection. The aggregation induced quenching due to electron transfer was demonstrated by photoluminescence, HR-TEM, FTIR, DLS, and zeta potential interrogations. In buffer of pH 7, response is linear in the 0.2 ~ 100 μM for Cr(VI) and from 0.4 ~ 250 μM for DA. The respective detection limits are 80 and 135 nM. The method was applied to the determination of both Cr(VI) and DA in (spiked) tap, lake and sea water, and in human urine samples. The low toxicity of CA-AuCu NCs was validated by the MTT assay, and their responses to Cr(VI) ions and DA was also proven by Raw 264.7 cell imaging.

Graphical abstract

Cysteamine capped Au-Cu nanoclusters (CA-AuCu NCs) were synthesized via one-pot anti-galvanic reduction and utilized in sensing of Cr(VI) ions and dopamine (DA) with demonstrated real/urine and cell imaging applications.

Keywords

Au-cu alloy Neurotransmitter Cr(VI) detection Colorimetric sensor Particle aggregation Static quenching Nanomolar detection Cell imaging Spiked urine investigation Real analysis 

Notes

Acknowledgements

The authors are grateful to the Ministry of Science and Technology of Taiwan for financially supporting this research under the contract MOST 107-2811-M-009-015 and MOST 105-2112-M-009-005-MY3.

Compliance with ethical standards

Conflicts of interest

Diluted spiked urine samples used in this study are remnants of our earlier reports and not clinical/collected from any volunteer. The cell lines were provided by the Food Industry Research and Development Institute (Taiwan). The author(s) declare that they have no competing interests.

Supplementary material

604_2019_3974_MOESM1_ESM.pdf (3.8 mb)
ESM 1 (PDF 3865 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  • Muthaiah Shellaiah
    • 1
  • Turibius Simon
    • 2
  • Natesan Thirumalaivasan
    • 1
  • Kien Wen Sun
    • 1
    Email author
  • Fu-Hsiang Ko
    • 2
  • Shu-Pao Wu
    • 1
  1. 1.Department of Applied ChemistryNational Chiao Tung UniversityHsinchuTaiwan
  2. 2.Department of Materials Science and EngineeringNational Chiao Tung UniversityHsinchuTaiwan

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