期刊
PHYSICA B-CONDENSED MATTER
卷 438, 期 -, 页码 22-28出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2013.12.043
关键词
Gold nanostructure; Plasmonic resonance; SERS; DDA
资金
- National Natural Science Foundation of China [10804101, 60908023, 11375159]
- Science and Technology Development Foundation of Chinese Academy of Engineering Physics [2010B0401055]
- Open Foundation of Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology and Research Center of Laser Fusion, CAEP [12zxjk07]
- Ministry of Education [1343-76140000014]
- Hunan Provincial Innovation Foundation for Post-graduate [CX2012B114]
- Open-End Fund for the Valuable and Precision Instruments of Central South University [CSUZC2012032]
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. (C) 2014 Elsevier B.V. All rights reserved
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