Controllable fabrication of metallic photonic crystals for ultra-sensitive SERS and photodetectors
Controllable fabrication of metallic photonic crystals for ultra-sensitive SERS and photodetectors
复制标题
用于超灵敏 SERS 和光电探测器的金属光子晶体的可控制造
DOI：
10.1039/c7ra11721c
复制
发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Hu, Xiaobin
中科院分区：
文献类型：
--
作者：
Cai, Zihe;Yan, Yang;Hu, Xiaobin
金属光子晶体（MPC）具有优异的可控光学性能，在光学传感器、太阳能转换、超灵敏分子探测等方面具有重要的应用价值，本文采用模板辅助电化学沉积法制备了一系列由等离子体金属（Ag和Cu）和过渡金属（Ni和Co）组成的反蛋白石结构MPC。在紫外-可见光区，等离子体MPC表现出由LSPR模式和布拉格模式组成的非常强的多重等离子体共振。MPC的这些非凡的光学性质被用于在大面积（约1.0 cm 2）上实现超灵敏的检测（10−13 M，相当于平均每μm2表面积上约0.094个分子），并且拉曼信号增强因子为1.9 × 1010，这表明Ag MPC能够进行单分子检测。此外，MPC可以充当等离子体激元诱导的直接光电流产生中的高效光吸收剂和催化活性位点。一个显着的上升，光电流中观察到的光被打开的Ag和Cu的MPC，这表现出高度符合光功率密度的线性模型。
Metallic photonic crystals (MPCs), with extraordinary and controllable optical properties, are extremely desirable for optical sensors, solar energy conversion, ultrasensitive molecular detection and so on. Herein, a series of MPCs with inverse opal structure consisting of plasmonic metals (Ag and Cu) and transition metals (Ni and Co), respectively, are fabricated using a template-assisted electrochemical deposition method. In the UV-vis light region, plasmonic MPCs show tremendously strong multiple plasmon resonance made up of LSPR modes and Bragg modes. These extraordinary optical properties of MPCs are utilized to achieve ultra-sensitive detection (10−13 M, equivalent to ∼0.094 molecules per μm2 on average of the surface area) over a large area (≈1.0 cm2) and a Raman signal enhancement factor of 1.9 × 1010, suggesting that Ag MPCs are capable of single molecule detection. In addition, MPCs can act as efficient light absorbers and catalytically active sites in plasmon-induced direct photocurrent generation. A remarkable rise in photocurrent is observed as the light is switched on for Ag and Cu MPCs, which exhibits a high accordance with a linear model of optical power density.