中国激光, 2015, 42 (3): 0303013, 网络出版: 2015-02-05   

紫外-可见光还原控制银纳米周期结构与形貌及其在表面增强拉曼散射中的应用

Ag Periodic Nanostructures and Morphology Controlled by Ultraviolet-Visual Photoreduction for Surface-Enhanced Raman Scattering
作者单位
北京工业大学激光工程研究院, 北京 100124
摘要
光还原特别是激光还原金属离子制备纳米结构作为一种化学成分纯净和工艺可控性高的微纳制造手段,已经得到了广泛的研究与应用。目前,该方法加工出的金属结构已应用于光谱检测、生物荧光成像、三维微纳结构制造等领域。针对当前基于双(多)光子吸收效应直写技术无法解决的加工效率低等问题,采用紫外纳秒激光双光束干涉法,提出了一步原位光还原银离子的制造方法。结合紫外和可见光辐照还原银离子,成功制备出大面积具有不同表面形貌的纳米级周期的光栅结构。详细讨论了激光还原时间、银离子浓度、不同波长光辐照等条件对光还原的影响,对双束光干涉以及光还原机制进行了分析。另一方面,银离子还原后形成的结构是由大量的尺寸为几十纳米的颗粒构成,排列紧密,因而具有显著的表面增强拉曼效应。对萘普生分子进行检测后,证实了该纳米结构具有较优的表面增强效果。
Abstract
Photoreduction, especially laser-reduction, is a clean and controllable micro- and nano-fabrication method which has been applied in the field of spectroscopy, fluorescent imaging and three dimensional (3D) fabrication. The in situ reduction of Ag+ with ultraviolet nanosecond laser lithography is focused, which is much time-effective compared with two(multi)-photon absorption reduction. Combined with ultraviolet and visible light reduction, different sub- micron gratings with large area and different surface morphology are fabricated. The reduction mechanism based on the roles of laser reduction time is discussed, Ag+ concentration and light wavelength. The gratings compose of a large number of close-packed Ag nanoparticles which are of importance for surfaceenhanced Raman scattering. The performance of surface-enhanced Raman scattering is demonstrated by tracing naproxen.
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白石, 周伟平, 马颖, 侯婷琇, 石晓敏, 李双浩, 陈涛, 胡安明. 紫外-可见光还原控制银纳米周期结构与形貌及其在表面增强拉曼散射中的应用[J]. 中国激光, 2015, 42(3): 0303013. 白石, 周伟平, 马颖, 侯婷琇, 石晓敏, 李双浩, 陈涛, 胡安明. Ag Periodic Nanostructures and Morphology Controlled by Ultraviolet-Visual Photoreduction for Surface-Enhanced Raman Scattering[J]. Chinese Journal of Lasers, 2015, 42(3): 0303013.

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