LSPR optical fiber biosensor based on a 3D composite structure of gold nanoparticles and multilayer graphene films

• Published in: Optics express Vol. 28; no. 5; p. 6071
• Main Authors: Li, Can, Li, Zhen, Li, Shuanglu, Zhang, Yanan, Sun, Baoping, Yu, Yuehao, Ren, Haiyang, Jiang, Shouzhen, Yue, Weiwei
• Format: Journal Article
• Language: English
• Published: United States 02.03.2020
• Subjects: Biosensing Techniques; Computer Simulation; Gold - chemistry; Graphite - chemistry; Metal Nanoparticles - chemistry; Metal Nanoparticles - ultrastructure; Optical Fibers; Surface Plasmon Resonance
• ISSN: 1094-4087; 1094-4087
• DOI: 10.1364/OE.385128

In this paper, a localized surface-plasmon resonance (LSPR) biosensor, which uses a U-shaped multi-mode fiber (U-MMF), is introduced and investigated. It is modified with a complex of three-dimensional (3D) gold nanoparticles and multilayer graphene as spacer: n*(Au/G)@U-MMF, where n denotes the layer number of gold nanoparticles. The gold nanoparticles were synthesized by reducing chloroauric acid. Graphene films were formed using a liquid/chemical method. The number of gold-nanoparticle layers was found to be critical for the performance of the sensor. Moreover, using the finite-difference time domain, 3D nanostructures, with a wide range of gold-nanoparticle layers, were explored. The sensor showed the sensitivity of 1251.44 nm/RIU, as well as high stability and repeatability; for the measurement-process of time- and concentration-dependent DNA hybridization kinetics with detection concentrations, ranging from 0.1nM to 100 nM, the sensor displayed excellent performance, which points towards a vast potential in the field of medical diagnostics.