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Citation: YANG Xin-Wei, ZHANG Gui-Rong, LI Yong-Xiu, XU Bo-Qing. Size-Control of Monodispersing ld Nanoparticles via Stepwise Seed-Mediated Growth[J]. Acta Physico-Chimica Sinica, ;2009, 25(12): 2565-2569. doi: 10.3866/PKU.WHXB20091213 shu

Size-Control of Monodispersing ld Nanoparticles via Stepwise Seed-Mediated Growth

1.
Research Center for Rare Earths& Nano/Micro Functional Materials, Nanchang University, Nanchang 330031, P. R. China; Key Laboratory of Organic Optoelectronics and Molecular Engineering, Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China

Received Date: 10 July 2009
Available Online: 28 October 2009

A stepwise seed-mediated growth approach is practiced to synthesize monodispersing Au particles in diameters of 3.2-14.0 nm using poly(vinylpyrrolidone) (PVP) and D-ascorbic acid as the capping agent and reductant, respectively. The starting Au seeds are in diameters of (1.9±0.4) nm and are obtained by reduction of aqueous HAuCl4 with NaBH4 in the presence of PVP. By control of the ratio of seeds to metal precursor (HAuCl4), nearly dispersing Au particles with average diameters of 3.2, 4.7, 6.3, 8.0, 10.3, and 14.0 nm are obtained in sequential growth steps without the need of using alternative reductant and capping agent. Key factors affecting the size distribution or monodispersity of Au particles are discussed on the basis of LaMer growth model. The use of higher seeds-to-HAuCl4 ratios in coupling with slow ascorbic acid addition is crucial for the control of monodispersity of product Au nanoparticles. Fast ascorbic acid addition would lead to secondary nucleation which results in Au particles with broadly dispersed sizes.
- Stepwise seed-mediated growth,
- Monodispersing ld nanoparticles,
- Poly(vinylpyrrolidone),
- Ascorbic acid,
- Nonosize-control
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