Convenient synthesis of stable silver quantum dots with enhanced photoluminescence emission by laser fragmentation

doi:10.1088/1674-1056/25/4/046103

Abstract A new strategy for the facile synthesis of very stable and mono-dispersed silver (Ag) quantum dots (QDs) is developed by laser fragmentation of bulk Ag in water using polysorbate 80 as a dispersing and stabilizing agent. The surfactant plays an important role in the formation of size-controlled Ag nano-structures. The Ag QDs have excellent photo-stability of ～500 h and enhanced photoluminescence (PL) at 510 nm. This has significant implications for selective and ultrasensitive PL probes. Based on laser fragmentation in the biocompatible surfactant solution, our results have opened up a novel paradigm to obtain stable metal QDs directly from bulk targets. This is a breakthrough in the toxicity problems that arise from standard chemical fabrication.

Keywords: size-controlled Ag nano-structures pulsed laser fragmentation

Received: 20 October 2015
Revised: 10 December 2015
Accepted manuscript online:

PACS:	61.46.-w	(Structure of nanoscale materials)
	52.38.Mf	(Laser ablation)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11575102, 11105085, 11275116, and 11375108) and the Fundamental Research Funds of Shandong University, China (Grant No. 2015JC007).

Corresponding Authors: Ming Chen
E-mail: chenming@sdu.edu.cn

Cite this article:

Shuang Li(李爽), Ming Chen(陈明) Convenient synthesis of stable silver quantum dots with enhanced photoluminescence emission by laser fragmentation 2016 Chin. Phys. B 25 046103

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Convenient synthesis of stable silver quantum dots with enhanced photoluminescence emission by laser fragmentation

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