期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 459, 期 -, 页码 218-223出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2015.08.019
关键词
Two-step method; Spheroid gold nanorods; Surface plasmon resonance
资金
- Higher Education Authority (HEA), Ireland, under the Postgraduate R & D skills programme
This research investigated a two-step continuous process to synthesize colloidal suspension of spheroid gold nanorods. In the first step; gold precursor was reduced to seed-like particles in the presence of polyvinylpyrrolidone and ascorbic acid. In continuous second step; silver nitrate and alkaline sodium hydroxide produced various shape and size Au nanoparticles. The shape was manipulated through weight ratio of ascorbic acid to silver nitrate by varying silver nitrate concentration. The specific weight ratio of 1.35-1.75 grew spheroid gold nanorods of aspect ratio similar to 1.85 to similar to 2.2. Lower weight ratio of 0.5-1.1 formed spherical nanoparticle. The alkaline medium increased the yield of gold nanorods and reduced reaction time at room temperature. The synthesized gold nanorods retained their shape and size in ethanol. The surface plasmon resonance was red shifted by similar to 5 nm due to higher refractive index of ethanol than water. (C) 2015 Elsevier Inc. All rights reserved.
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