Lin Dongdong, Dai Kunjie, Yu Tianxiang, Zhao Wenhui, Xu Wenwu
Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, 818 Fenghua Road, Ningbo 315211, China.
Nanomaterials (Basel). 2020 Jul 4;10(7):1317. doi: 10.3390/nano10071317.
In this study, hexagonal-packed Si nanorods (SiNRs) arrays were fabricated and conjugated with Au nanoparticles (AuNPs) in different spatial distributions for surface-enhanced Raman spectroscopy (SERS). The AuNPs were functionalized on the bottom of SiNRs (B-SiNRs@AuNPs), top of SiNRs (T-SiNRs@AuNPs) and sides of SiNRs (S-SiNRs@AuNPs), respectively. Our results demonstrated that the SiNRs conjugated with AuNPs on the sides achieved high reproducibility in detection of R6G molecules, while the AuNPs on the top of the SiNRs obtained the strongest Raman enhancement. In addition, the substrate with S-SiNRs@AuNPs obtained the highest spatial uniformity of enhancement. The finite-difference time-domain simulation gave further evidence that the incident light could be confined in the space of SiNRs arrays and yield a zero-gap enhancement coupled with the AuNPs. Our study provided a spatially tunable SiNRs@AuNPs substrate with high sensitivity and reproducibility in molecular detection.
在本研究中，制备了六方密排硅纳米棒（SiNRs）阵列，并将其与具有不同空间分布的金纳米颗粒（AuNPs）共轭，用于表面增强拉曼光谱（SERS）。AuNPs分别功能化在SiNRs的底部（B-SiNRs@AuNPs）、顶部（T-SiNRs@AuNPs）和侧面（S-SiNRs@AuNPs）。我们的结果表明，侧面与AuNPs共轭的SiNRs在检测R6G分子时具有高重现性，而SiNRs顶部的AuNPs获得了最强的拉曼增强。此外，具有S-SiNRs@AuNPs的基底获得了最高的增强空间均匀性。时域有限差分模拟进一步证明，入射光可以被限制在SiNRs阵列的空间中，并与AuNPs产生零间隙增强。我们的研究提供了一种在分子检测中具有高灵敏度和重现性的空间可调SiNRs@AuNPs基底。
