Nanoporous gold film based SPR sensors for trace chemical detection

Li Wang; Xiaoqing Gong; Xiumei Wan; Dan-feng Lu; Zhi-mei Qi

doi:10.1117/12.2267069

10 February 2017 Nanoporous gold film based SPR sensors for trace chemical detection

Li Wang, Xiaoqing Gong, Xiumei Wan, Dan-feng Lu, Zhi-mei Qi

Proceedings Volume 10250, International Conference on Optical and Photonics Engineering (icOPEN 2016); 102502A (2017) https://doi.org/10.1117/12.2267069
Event: Fourth International Conference on Optical and Photonics Engineering, 2016, Chengdu, China

Abstract

Thin films of nanoporous gold (NPG) have both localized and propagating surface plasmon resonance (SPR) effects. The propagating SPR effect of NPG film combined with its huge internal surface area makes it applicable as an evanescent wave sensor with high sensitivity. In this work, NPG films with controlled thicknesses were fabricated on glass substrates by sputtering deposition of AuAg films followed by dealloying in nitric acid. By using of the NPG films as the sensing layer, a broadband wavelength-interrogated SPR sensor was prepared for chemical and biological detection. The propagating SPR absorption band in the visible-near infrared region was clearly observed upon exposure of the NPG film to air, and this band was detected to move to longer wavelengths in response to adsorption of molecules within the NPG film. Simulations based on Fresnel equations combined with Bruggeman approximation were carried out for optimizing the propagating SPR property of NPG film. The sensor’s performance was investigated using both bisphenol A (BPA) and lead (II) ions as analytes. According to the experimental results, the detection limits of the sensor are 5 nmol·L^-1 for BPA and 1 nmol·L^-1 for lead (II) ions. The work demonstrated the outstanding applicability of the NPG film based SPR sensor for sensitive environmental monitoring.

Citation Download Citation

Li Wang, Xiaoqing Gong, Xiumei Wan, Dan-feng Lu, and Zhi-mei Qi "Nanoporous gold film based SPR sensors for trace chemical detection", Proc. SPIE 10250, International Conference on Optical and Photonics Engineering (icOPEN 2016), 102502A (10 February 2017); https://doi.org/10.1117/12.2267069

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