光学学报, 2018, 38 (2): 0228002, 网络出版: 2018-08-30
纳米多孔金膜表面等离子体共振传感器的制备与表征 下载: 1522次封面文章
Preparation and Characterization of Nanoporous Gold Film Based Surface Plasmon Resonance Sensor
传感器 纳米多孔金薄膜 表面等离子体共振 孔隙率 高灵敏度 sensors nanoporous gold film surface plasmon resonance porosity high sensitivity
摘要
采用射频溅射技术在平板玻璃基底上淀积约60 nm厚的金银合金薄膜,然后在室温下通过化学脱合金法形成附着力强、大面积均匀的纳米多孔金膜(NPGF)。利用自建的宽光谱表面等离子体共振(SPR)检测平台获得了暴露于空气中的NPGF在可见-近红外波段的共振光谱,利用菲涅耳公式结合Bruggeman介电常数近似方程拟合实验结果,得到NPGF的孔隙率约为0.38。研究了NPGF-SPR传感器对不同浓度水溶液中的Pb
2+离子和三聚氰胺的响应特性,结果表明该传感器能够对水溶液中浓度为1 nmol·L
-1的Pb
2+及三聚氰胺作出明显响应。对比实验显示NPGF-SPR传感器的灵敏度远高于常规的致密金膜SPR传感器。
Abstract
Au-Ag alloy films of around 60 nm thickness are deposited on the slab glass substrate by radio frequency sputtering technique. Then large-area uniform nanoporous gold films (NPGF) with strong adhesion are fabricated by chemical dealloying at room temperature. The resonance spectrum of NPGF exposed to the air in the visible-near-infrared region is obtained by a self-built broadband spectral surface plasmon resonance (SPR) detection platform. The Fresnel formula and Bruggeman dielectric constant approximation equation are used to fit the experimental results. The porosity of NPGF is about 0.38. The response characteristics of the NPGF-SPR sensor to Pb
2+ ions and melamine molecules adsorbed from the individual aqueous solutions with different concentrations are investigated. The experimental results show that the NPGF-SPR sensor can make obvious responses to both Pb
2+ ions and melamine molecules in the aqueous solution with 1 nmol·L
-1 concentration. The comparison experiment shows that the NPGF-SPR sensor is much more sensitive than the conventional SPR sensor with a dense gold layer.
王丽, 万秀美, 高然, 逯丹凤, 祁志美. 纳米多孔金膜表面等离子体共振传感器的制备与表征[J]. 光学学报, 2018, 38(2): 0228002. Li Wang, Xiumei Wan, Ran Gao, Danfeng Lu, Zhimei Qi. Preparation and Characterization of Nanoporous Gold Film Based Surface Plasmon Resonance Sensor[J]. Acta Optica Sinica, 2018, 38(2): 0228002.