Spontaneous formation of gold nanostructures in aqueous microdroplets

被引:122
作者
Lee, Jae Kyoo [1 ]
Samanta, Devleena [1 ]
Nam, Hong Gil [2 ,3 ]
Zare, Richard N. [1 ]
机构
[1] Stanford Univ, Dept Chem, Stanford, CA 94305 USA
[2] Inst Basic Sci, Ctr Plant Aging Res, Daegu 42988, South Korea
[3] DGIST, Dept New Biol, Daegu 42988, South Korea
基金
美国国家科学基金会;
关键词
NANOWIRE ARRAYS; SHAPE CONTROL; NANOPARTICLES; GROWTH; WATER; SIZE; ACCELERATION; INTERFACE; CATALYSIS;
D O I
10.1038/s41467-018-04023-z
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The synthesis of gold nanostructures has received widespread attention owing to many important applications. We report the accelerated synthesis of gold nanoparticles (AuNPs), as well as the reducing-agent-free and template-free synthesis of gold nanoparticles and nanowires in aerosol microdroplets. At first, the AuNP synthesis are carried out by fusing two aqueous microdroplet streams containing chloroauric acid and sodium borohydride. The AuNPs (similar to 7 nm in diameter) are produced within 60 mu s at the rate of 0.24 nm mu s(-1). Compared to bulk solution, microdroplets enhance the size and the growth rate of AuNPs by factors of about 2.1 and 1.2 x 10(5), respectively. Later, we find that gold nanoparticles and nanowires (similar to 7 nm wide and > 2000 nm long) are also formed in microdroplets in the absence of any added reducing agent, template, or externally applied charge. Thus, water microdroplets not only accelerate the synthesis of AuNPs by orders of magnitude, but they also cause spontaneous formation of gold nanostructures.
引用
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页数:9
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