Seed Number Density-controlled Synthesis of Au@SiO2 Nanoparticles†

doi:10.7503/cjcu20140230

Abstract

Abstract:

In this paper, we systematically investigated the synthesis of Au@SiO₂ NPs in isopropanol medium using Frens Au colloids as seeds. It shows that the yield of mononucleate Au@SiO₂ NPs is dependent on the amount of the catalyst added, the feeding rate of the silicon source, and especially the number density of the Au seeds introduced. Following these findings, highly monodispersed 200, 320, and 450 nm Au@SiO₂ NPs were synthesized, which are ideal building blocks for construction of functional materials.

Key words: Au colloids, Seed number density, Silica, Nanoparticles

CLC Number:

O641

TrendMD:

LUO Chunxiang, CUI Ying, YU Huimin, KONG Gezhi, HU Jiawen. Seed Number Density-controlled Synthesis of Au@SiO₂ Nanoparticles^†[J]. Chem. J. Chinese Universities, 2014, 35(9): 1948.

Figures/Tables 5

Fig.1 SEM images of the Au@SiO2 NPs synthesized with different Au seed number densities Au seed number density/mL-1: (A) 4.50×1010; (B) 2.25×1011; (C)3.15×1011; (D)4.05×1011; (E) 4.95×1011; (F) 6.75×1011.

Table 1 Yield of mononucleate Au@SiO2 NPs synthesized with different seed number densities

No.^*	Mononucleate	Core-free	Multinucleate	Yield of mononucleate(%)
1	64	890	0	6.70
2	151	538	0	21.9
3	132	70	0	34.7
4	162	5	0	97.0
5	151	44	2	76.6
6	79	30	0	72.5

Fig.2 SEM images of Au@SiO2 NPs synthesized with 16 nm Au seed densities of 4.05×1011 mL-1(A) and 4.24×1012 mL-1(B) and 30 nm Au seed densities of 4.05×1011 mL-1(C) and 1.23×1012 mL-1(D)

Fig.3 SEM images of Au@SiO2 NPs synthesized with 0.14 mL(A), 0.27 mL(B), 0.40 mL(C) and 0.53 mL(D) of 28% ammonia

Fig.4 UV-Vis spectra for 55 nm Au NPs(a) and 200 nm(b), 320 nm(c) and 450 nm(d) Au@SiO2 NPs(A) and SEM images of the synthesized 200 nm(B), 320 nm(C) and 450 nm(D) Au@SiO2 NPs

References 20

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Seed Number Density-controlled Synthesis of Au@SiO₂ Nanoparticles^†

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