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Materials 2018, 11(2), 191;

Green Synthesis of Fluorescent Palladium Nanoclusters

1,* and 2,*
College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, Xinjiang, China
Laboratory of Environmental Sciences and Technology, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China
Authors to whom correspondence should be addressed.
Received: 6 January 2018 / Revised: 22 January 2018 / Accepted: 22 January 2018 / Published: 26 January 2018
(This article belongs to the Section Advanced Nanomaterials)
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Metal nanoclusters, with dimensions between atomic and nanoparticles, have attracted a great deal of attention due to their significantly unusual properties. Water-soluble palladium nanoclusters (Pd NCs) with blue-green fluorescence were synthesized by a water bath heating method, with methionine as a stabilizer and ascorbic acid as a reducing agent. We investigated the optimal synthesis conditions, stability, and pH response of the obtained products in detail. The synthesized materials were characterized by ultraviolet-absorption spectroscopy, fluorescence spectroscopy, high-resolution transmission electron microscopy, and atomic force microscopy. These experimental results showed that the Pd NCs had a small size of ~1.91 nm, with a uniform size distribution. Additionally, the Pd NCs emitted blue-green fluorescence under ultraviolet light with a quantum yield of 5.47%. Notably, both stabilizers and reducing agents used in this synthesis method are nutrients for humans, non-toxic, and harmless. This method could be viewed as a biologically friendly and green way of preparing fluorescent metal nanoclusters. The as-prepared fluorescent Pd NCs also possessed excellent fluorescence detection ability and were very sensitive to low concentrations of hemoglobin, with a linear response in the range of 0.25–3.5 μM and a detection limit of 50 nM. View Full-Text
Keywords: palladium nanoclusters; methionine; fluorescence; hemoglobin palladium nanoclusters; methionine; fluorescence; hemoglobin

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Peng, Y.; Wang, P.; Luo, L.; Liu, L.; Wang, F. Green Synthesis of Fluorescent Palladium Nanoclusters. Materials 2018, 11, 191.

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