表面增强拉曼散射活性
(1. 中国工程物理研究院 激光聚变研究中心，绵阳 621900；
2. 中南大学 物理科学与技术学院，长沙 410083；3. 四川大学 原子与分子物理研究所，成都 610065)
摘 要: 利用预处理−化学沉积法在玻璃基底表面原位生长形貌各异的纳米银粒子, 获得高活性的表面增强拉曼散射(SERS)基底。采用SEM、XRD和UV等测试手段对样品进行分析和表征, 并考察纳米银粒子的形貌对其薄膜基底表面增强拉曼散射活性的影响。结果表明：随着反应液中硝酸银与乙二胺的摩尔比以及反应温度的改变，纳米银粒子的形貌发生变化。当反应温度为30 ℃、硝酸银与乙二胺的摩尔比为1׃5时，制备出的由纳米银薄片组成的薄膜具有最强的紫外吸收光谱红移，可红移至800 nm；并且以此条件得到的表面增强拉曼散射活性基底具有最强的表面增强拉曼散射信号，拉曼增强因子达到258.4。
关键字: 表面增强拉曼散射基底; 化学沉积; 银纳米粒子; 拉曼增强因子
its surface-enhanced Raman scattering
（1. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China;
2. School of Physical Science and Technology, Central South University, Changsha 410083, China;
3. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China）
Abstract:A novel solid substrate with high surface-enhanced Raman scattering (SERS) activity was fabricated through in-situ growth of silver particles with variant morphology on glass substrates by pretreatment electroless. The effect of surface morphology of thin films of silver nanoparticles on the SERS activity of the substrate was studied by SEM, XRD and UV-Vis spectroscopy. The results show that the morphology of silver nanoparticles changes with the change of the molar ratio of AgNO3 and ethylenediamine in reaction solution and the reaction temperature. The film containing nano flake of silver has the strongest UV absorption spectra at 800 nm with red-shift when the reaction temperature is 30 ℃ and the molar ratio of AgNO3 to ethylenediamine is 1׃5. The strongest SERS signal of SERS-active substrate is obtained under the same condition, and the Raman enhancement factor reaches 258.4.
Key words: surface-enhanced Raman scattering; electroless deposition; silver nano particle; Raman enhancement factor
