Kim Yeonhong, Gupta Prince, Kim Kyoungsik
School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
NanoSYD, Mads Clausen Institute, University of Southern Denmark, Alsion 2, Sønderborg 6400, Denmark.
ACS Appl Mater Interfaces. 2020 Dec 30;12(52):58390-58402. doi: 10.1021/acsami.0c18138. Epub 2020 Dec 18.
In this study, a plasmonically active substrate is developed with the aim of controlling the perfect absorption and manipulating its optical properties for application in SERS (in NIR regime) and colorimetry. Based on modified fabrication method of anodized aluminum oxide (AAO), the cost-effective self-aggregation technique is presented to fabricate unique topography of bone-fire-like funnel-shaped collapsed and vertically aligned nanowire structures. The length of the nanowire and the modification of surface topography induced by capillary force inside the nanowire are set to structural parameters, and the effect of their changes is closely studied. After deposition of 40 nm gold (Au) film on numerous AAO nanowire structures with different wire lengths and unique topography, the localized surface plasmon resonance excitation is generated, and also its application on reflection and SERS spectra have been shown quantitatively. The length of the wire and surface topography modification are identified as suitable parameters to tune the reflection/absorption (from <40 to >90%) as well as colorimetric effect. Finally, an optimized wire length of Au-coated AAO substrate in SERS sensing application with 3.92 × 10 order of enhancement of rhodamine 6G (R6G) Raman signal is demonstrated.
在本研究中，开发了一种等离子体活性基底，旨在控制完美吸收并操纵其光学特性，以应用于表面增强拉曼光谱（在近红外区域）和比色法。基于阳极氧化铝（AAO）的改进制造方法，提出了一种经济高效的自聚集技术，以制造独特的骨火状漏斗形塌陷且垂直排列的纳米线结构形貌。将纳米线的长度以及纳米线内部毛细力引起的表面形貌变化设定为结构参数，并深入研究了它们变化的影响。在具有不同线长和独特形貌的众多AAO纳米线结构上沉积40 nm金（Au）膜后，产生了局部表面等离子体共振激发，并且还定量展示了其在反射和表面增强拉曼光谱上的应用。线长和表面形貌变化被确定为调节反射/吸收（从<40%到>90%）以及比色效应的合适参数。最后，展示了在表面增强拉曼光谱传感应用中，涂覆金的AAO基底的优化线长对罗丹明6G（R6G）拉曼信号增强了3.92×10倍。
