Citation: REN Yue-Ping, XU Cheng-Cheng, FANG Yun. Facile Synthesis of ld Nanoflowers in a Polyvinyl Pyrrolidone Alkaline Aqueous Solution[J]. Acta Physico-Chimica Sinica, ;2011, 27(05): 1244-1248. doi: 10.3866/PKU.WHXB20110441 shu

Facile Synthesis of ld Nanoflowers in a Polyvinyl Pyrrolidone Alkaline Aqueous Solution

1.
School of Chemical & Material Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, P. R. China

Received Date: 16 December 2010
Available Online: 21 March 2011
Fund Project: 国家自然科学基金 (20871059) (20871059)江苏省研究生创新计划项目(CX08B_118Z)资助 (CX08B_118Z)

Three-dimensional (3D) ld nanoflowers of 60-80 nm in diameter were successfully synthesized using polyvinyl pyrrolidone (PVP) as both a protecting agent and a reducing agent in alkaline aqueous solutions. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) images revealed that many antennae of 10-15 nm existed on their surfaces. X-ray diffraction (XRD) pattern suggested face-centered cubic (fcc) structures for these ld nanoflowers. The selected area electron diffraction (SAED) pattern of a single ld nanoflower indicated polycrystal characteristics. We found that there were three key stages in the growth of the ld nanoflowers: primary nanocrystals agglomerated to form multipod-like nanoparticles, and then the multipod-like nanoparticles aggregated into loose flower-like nanoparticles that ultimately grew into compact ld nanoflowers through Ostwald ripening. During the synthesis of ld nanoflowers, the molar ratios of PVP/HAuCl₄ at fixed HAuCl₄ and NaOH concentrations mostly influenced the morphologies of the final products. Therefore, a proper molar ratio of PVP/HAuCl₄ and a suitable NaOH concentration were essential for the synthesis of typical ld nanoflowers with controlled sizes and antenna architectures.
- ld,
- Nanoflower,
- Nanoantenna,
- Polyvinyl pyrrolidone,
- Sodium hydroxide
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沈阳化工大学材料科学与工程学院沈阳 110142