Size controllable synthesis of ultrafine spherical gold particles and their simulation of plasmonic and SERS behaviors

作者：Yi, Zao; Xu, Xibin; Luo, Jiangshan; Li, Xibo; Yi, Yong; Jiang, Xiaodong; Yi, Yougen; Tang, Yongjian

来源：Physica B: Condensed Matter , 2014, 438: 22-28.

DOI：10.1016/j.physb.2013.12.043

• Gold nanostructure
• Plasmonic resonance
• SERS
• DDA

A simple and reproducible way was explored to synthesize quasi spherical gold particles with different size distributions in water by rapidly adding a mixture solution of HAuCl4, sodium citrate, and a trace amount of silver nitrate. By careful tuning of the reaction parameters, mono disperse gold particles with the diameter of 5-220 rim can be obtained controllably. The particle size of 130 nm for the particles film showed the highest SERS activity with the 632.8 nm excitation. The theoretical calculations of the UV-vis extinction spectra can be directly compared with experiments by using the discrete dipole approximation (DDA). Control of nanostructure shape allows optimization of plasmon resonance for molecular detection and spectroscopy.

• 出版日期2014-4-1
• 单位中国工程物理研究院; 中国工程物理研究院激光聚变研究中心; 西南科技大学; 中南大学