Visbal Cristhian A, Cervantes Wilkendry Ramos, Marín Lorena, Betancourt John, Pérez Angélica, Diosa Jesús E, Rodríguez Luis Alfredo, Mosquera-Vargas Edgar
Grupo de Películas Delgadas, Departamento de Física, Universidad del Valle, Santiago de Cali 760032, Colombia.
Institución Educativa Número Dos, Maicao 442001, Colombia.
Nanomaterials (Basel). 2024 Sep 20;14(18):1525. doi: 10.3390/nano14181525.
Gold nanostructures (AuNSs) were used to fabricate surface-enhanced Raman spectroscopy (SERS) substrates. These AuNSs were produced using the solid-state dewetting method from thin films. The fragmentation process was studied at 300 °C, with durations of thermal treatment of 1, 3, 6, and 12 h. These SERS substrates were then employed to detect Rhodamine B (RhB) as the model analyte, simulating a contaminant in the water at a concentration of 5 ppm. The morphology of the AuNSs was examined using SEM, which revealed a spheroidal shape that began to coalesce at 12 h. The size of the AuNSs was estimated to range from 22 ± 7 to 24 ± 6 nm, depending on the annealing time. The localized surface plasmon resonance of the AuNSs was determined using absorption spectroscopy, showing a shift as the annealing time increased. The SERS signals of RhB adsorbed on the AuNS substrates were validated by performing a 10 × 10 point map scan over each sample surface (1, 3, 6, and 12 h), and a comparative analysis showed no significant differences in the positions of the bands; however, variations in intensity enhancement ranged from 5 to 123 times at 6 and 1 h, respectively.
金纳米结构（AuNSs）被用于制备表面增强拉曼光谱（SERS）基底。这些AuNSs是通过固态去湿法由薄膜制备而成。在300℃下研究了破碎过程，热处理时间分别为1、3、6和12小时。然后使用这些SERS基底检测罗丹明B（RhB）作为模型分析物，模拟水中浓度为5 ppm的污染物。使用扫描电子显微镜（SEM）检查了AuNSs的形态，结果显示其呈球形，在12小时时开始合并。根据退火时间，AuNSs的尺寸估计在22±7至24±6纳米范围内。使用吸收光谱法测定了AuNSs的局域表面等离子体共振，结果表明随着退火时间增加出现了位移。通过在每个样品表面（1、3、6和12小时）进行10×10点的图谱扫描，验证了吸附在AuNS基底上的RhB的SERS信号，对比分析表明各谱带位置无显著差异；然而，强度增强的变化在6小时和1小时时分别为5至123倍。
