Photo-assisted control of gold and silver nanostructures on silicon and its SERRS effect
Photo-assisted control of gold and silver nanostructures on silicon and its SERRS effect
复制标题
硅上金银纳米结构的光辅助控制及其SERRS效应
DOI：
10.1088/0022-3727/46/27/275303
复制
发表时间：
2013-07-10
影响因子：
3.4
通讯作者：
Fang, Yan
中科院分区：
文献类型：
--
作者：
Lahiri, Abhishek;Wen, Rui;Fang, Yan
先前已经证明了一种通过电偶置换来控制金纳米结构在n型硅上生长的简便方法。观察到在光和红光作用下，金纳米针在初始阶段形成，然后随着时间的推移垂直于衬底生长。然而，增长过程还没有完全被理解。在这里，我们试图通过使用透射电子显微镜、原子力显微镜和X射线衍射来表征生长过程，来理解在有光和无光的情况下的电偶位移现象。此外，我们还评估了激光对在硅上沉积银的影响，其中绿色激光的使用导致了树枝晶的形成，而球形纳米颗粒的形成是在黑暗中形成的。为了进一步评估金属-半导体杂化结构的益处，我们还对杂化衬底的表面增强共振拉曼光谱(SERRS)进行了评估，并证明了半导体衬底/金属-半导体界面在提高SERS活性方面的重要性。
A facile approach to control the growth of gold nanostructures on n-type silicon by galvanic displacement was demonstrated previously. It was observed that in the presence of light and red laser, at initial stages, gold nano-needles were formed, which then grew perpendicular to the substrate with time. However, the growth process has not yet been understood completely. Here, we have attempted to understand the galvanic displacement phenomena in the presence and absence of light by characterizing the growth process using transmission electron microscopy, atomic force microscopy and x-ray diffraction. Furthermore, we also evaluated the effect of laser on the deposition of silver on silicon wherein the use of green laser resulted in the formation of dendrites, whereas spherical nanoparticles were formed in dark. To further evaluate the benefits of the metal–semiconductor hybrid structure, we also evaluated the surface enhanced resonance Raman spectroscopy (SERRS) of the hybrid substrates and give evidence of the importance of the semiconductor substrate/metal–semiconductor interface in enhancing the SERRS activity.