表面增強拉曼散射活性
(1. 中國工程物理研究院 激光聚變研究中心，綿陽 621900；
2. 中南大學 物理科學與技術(shù)學院，長沙 410083；3. 四川大學 原子與分子物理研究所，成都 610065)
摘 要: 利用預(yù)處理−化學沉積法在玻璃基底表面原位生長形貌各異的納米銀粒子, 獲得高活性的表面增強拉曼散射(SERS)基底。采用SEM、XRD和UV等測試手段對樣品進行分析和表征, 并考察納米銀粒子的形貌對其薄膜基底表面增強拉曼散射活性的影響。結(jié)果表明：隨著反應(yīng)液中硝酸銀與乙二胺的摩爾比以及反應(yīng)溫度的改變，納米銀粒子的形貌發(fā)生變化。當反應(yīng)溫度為30 ℃、硝酸銀與乙二胺的摩爾比為1׃5時，制備出的由納米銀薄片組成的薄膜具有最強的紫外吸收光譜紅移，可紅移至800 nm；并且以此條件得到的表面增強拉曼散射活性基底具有最強的表面增強拉曼散射信號，拉曼增強因子達到258.4。
關(guān)鍵字: 表面增強拉曼散射基底; 化學沉積; 銀納米粒子; 拉曼增強因子
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
