Pang Yanzhao, Jin Mingliang
South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.
International Academy of Optoelectronics at Zhaoqing, South China Normal University, Zhaoqing 526060, China.
Nanomaterials (Basel). 2023 Apr 13;13(8):1358. doi: 10.3390/nano13081358.
The development of SERS detection technology is challenged by the difficulty in obtaining SERS active substrates that are easily prepared, highly sensitive, and reliable. Many high-quality hotspot structures exist in aligned Ag nanowires (NWs) arrays. This study used a simple self-assembly method with a liquid surface to prepare a highly aligned AgNW array film to form a sensitive and reliable SERS substrate. To estimate the signal reproducibility of the AgNW substrate, the RSD of SERS intensity of 1.0 × 10 M Rhodamine 6G (R6G) in an aqueous solution at 1364 cm was calculated to be as low as 4.7%. The detection ability of the AgNW substrate was close to the single molecule level, and even the R6G signal of 1.0 × 10 M R6G could be detected with a resonance enhancement factor (EF) as high as 6.12 × 10 under 532 nm laser excitation. The EF without the resonance effect was 2.35 × 10 using 633 nm laser excitation. FDTD simulations have confirmed that the uniform distribution of hot spots inside the aligned AgNW substrate amplifies the SERS signal.
表面增强拉曼光谱（SERS）检测技术的发展面临着挑战，即难以获得易于制备、高灵敏度且可靠的SERS活性基底。排列整齐的银纳米线（NWs）阵列中存在许多高质量的热点结构。本研究采用一种简单的液面相自组装方法制备了高度排列的银纳米线阵列薄膜，以形成灵敏且可靠的SERS基底。为评估银纳米线基底的信号重现性，计算得出1.0×10⁻⁶ M罗丹明6G（R6G）水溶液在1364 cm⁻¹处的SERS强度相对标准偏差（RSD）低至4.7%。银纳米线基底的检测能力接近单分子水平，在532 nm激光激发下，甚至可以检测到1.0×10⁻¹² M R6G的R6G信号，共振增强因子（EF）高达6.12×10⁵。在633 nm激光激发下，无共振效应时的EF为2.3×10⁴。时域有限差分（FDTD）模拟证实，排列整齐的银纳米线基底内部热点的均匀分布放大了SERS信号。
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