Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (05): 1244-1248.doi: 10.3866/PKU.WHXB20110441

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

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

REN Yue-Ping, XU Cheng-Cheng, FANG Yun   

  1. School of Chemical & Material Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, P. R. China
  • Received:2010-12-16 Revised:2011-01-23 Published:2011-04-28
  • Contact: FANG Yun E-mail:yunfang@126.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20871059) and Jiangsu Provincial Post Graduate Innovation Plan, China (CX08B_118Z).

Abstract:

Three-dimensional (3D) gold 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 gold nanoflowers. The selected area electron diffraction (SAED) pattern of a single gold nanoflower indicated polycrystal characteristics. We found that there were three key stages in the growth of the gold 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 gold nanoflowers through Ostwald ripening. During the synthesis of gold 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 gold nanoflowers with controlled sizes and antenna architectures.

Key words: Gold, Nanoflower, Nanoantenna, Polyvinyl pyrrolidone, Sodium hydroxide

MSC2000: 

  • O648