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Self-assembled gold micro/nanostructure arrays based on superionic conductor RbAg4I5 films

机译：基于外阴导体RBAG4I5薄膜的自组装金微/纳米结构阵列

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Herein, we propose a new strategy to fabricate gold (Au) micro/nanostructure arrays by photocatalytic solid-state electrochemical reaction between superionic conductor RbAg4I5 and Au films. The Au and RbAg4I5 films were successively deposited on a clean quartz substrate by vacuum thermal deposition method. A copper microgrid possessing periodic holes 100 mu m in diameter was put above the RbAg4I5 film as a mask plate, whereupon irradiation from a 405 nm wavelength laser was used to diffuse gold ions (Au+ ions) into vacant silver sites of RbAg4I5 and transfer Au+ through ion passageways in the RbAg4I5 film. When the laser was turned off, the Au+ ions were easily reduced due to low activity compared to the silver (Ag+) ions. After multiple on/off cycles of the 405 nm laser, the irradiated area of uniform Au film exhibited a periodic structural unit array whose period was the same as that of the mask plate hole array. Atomic force microscope and scanning electron microscope images revealed that a self-assembled needle-like nanostructure array grew perpendicular to the substrate surface inside each circle's structural unit. The height of the grown nanostructure array increased with laser power density. Raman enhancement of the gold nanostructure array as substrate was detected using Rhodamine 6G (R6G) ethanol solutions as probe molecules. The enhancement effect increased with the height of the grown nanostructure array, and could increase by two orders of magnitude greater than that of unirradiated Au film. This strategy offers a new method for the micro/nanostructure processing of gold and provides microscale-array-mediated surface-enhancement Raman-scattering (SERS) substrates comprising Au nanostructures for application in high-sensitivity spectrum analysis.
机译：在此，我们提出了一种新的策略来制造金（Au）微/纳米结构阵列通过消光催化固态电化学反应来制造过滤器RBAG4i5和Au膜之间的光催化固态电化学反应。通过真空热沉积方法连续地沉积Au和Rbag4i5薄膜在清洁的石英底物上。将具有连续100μm的铜微电孔作为掩模板放置在RBAG4I5薄膜上方，随后使用405nm波长激光的辐射将金离子（Au +离子）扩散成RBAG4i5的空位，并转移au +通过RBAG4I5薄膜中的离子通道。当激光关闭时，由于与银（Ag +）离子相比，由于低活性，Au +离子容易降低。在405nm激光器的多个开/关循环之后，均匀Au膜的照射区域显示出周期性的结构单元阵列，其周期与掩模板孔阵列的周期相同。原子力显微镜和扫描电子显微镜图像显示，自组装的针状纳米结构阵列垂直于每个圆形结构单元内的基板表面。生长的纳米结构阵列的高度随着激光功率密度而增加。使用罗丹明6G（R6G）乙醇溶液作为探针分子检测作为衬底的金纳米结构阵列的拉曼。增强效果随着生长纳米结构阵列的高度而增加，并且可以比未放射的Au膜的高度增加两个数量级。该策略为黄金的微/纳米结构加工提供了一种新的方法，并提供包括Au纳米结构的微量阵列介导的表面增强拉曼散射（SERS）底物，用于在高灵敏度谱分析中应用。

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