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Open AccessArticle

Green Synthesis of Fluorescent Palladium Nanoclusters

by Yan Peng 1,2, Pei Wang 2, Liang Luo 2, Lang Liu 1,* and Fu Wang 2,*
1
College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, Xinjiang, China
2
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.
Materials 2018, 11(2), 191; https://doi.org/10.3390/ma11020191
Received: 6 January 2018 / Revised: 22 January 2018 / Accepted: 22 January 2018 / Published: 26 January 2018
(This article belongs to the Section Advanced Nanomaterials and Nanotechnology)
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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MDPI and ACS Style

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

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