Modification and SERS Optimization of Triangular Ag Nanoplates
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Modification and SERS Optimization of Triangular Ag Nanoplates Runxiang Xu 1 & Luting Yan 1
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Yanyun Zhu 1 & Lan Yin 1 & Xiaodong Song 1
Received: 11 April 2020 / Accepted: 7 July 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Triangular Ag nanoplates have been synthesized via the seed-mediated method, which has good morphology and can be reproduced stably. The wavelength of local surface plasmon resonance (LSPR) can be easily controlled in the range of 500– 900 nm. When triangular Ag nanoplates were applied to surface-enhanced Raman scattering (SERS) based on suspension aggregates and solid aggregates, the detection limit of rhodamine 6G (R6G) were greatly increased to 3.125 × 10−7 M and 10−11 M, respectively, and there was an excellent linear relationship between the intensity of Raman peak and the concentration of R6G. In addition, when the excitation light was tuned to the LSPR wavelength, the surface plasmon resonance will be excited to the maximum extent, and the enhanced electromagnetic field will maximize the Raman scattering. Furthermore, some progress has been made in the optimization of SERS by compounding graphene hydrogels in solid aggregates and adding mercapto polyethylene glycol in suspension aggregates. Keywords Triangular Ag nanoplates . Suspension aggregates . Solid aggregates . Surface-enhanced Raman scattering
Introduction Raman spectroscopy is widely used for the detection of substances because it can quickly provide molecular structural information without destroying the molecular structure, but its practical application was severely limited by the shortcoming of the low Raman scattering intensity [1, 2]. In 1974, Fleischmann [3] discovered enhanced Raman scattering, which gradually made Raman spectroscopy widely used in practical applications [4–6]. Compared with other precious metal nanomaterials, the triangular Ag nanoplates have adjustable local surface plasmon resonance (LSPR) peaks, which makes them have great application potential in surface-enhanced Raman scattering (SERS). Up to now, Lai [7] has prepared Ag nanoplates by coreduction method and obtained triangular Ag nanoplate films with significant SERS activity for pyridine molecules. Zhang et al. [8] studied the surface-enhanced Raman effect with crystal violet as probe and Ag nanoplate as substrate, and the results showed that the enhancement factor (EF) was 2.6 × 103. Xue [9] acquired triangular Ag nanoplates * Luting Yan [email protected] 1
School of science, Beijing Jiaotong University, Beijing 100044, People’s Republic of China
by an improved photo-induced synthesis method and then obtained an enhanced substrate with EF of 107. Compared with the SERS based on solid-phase aggregates which is widely used at present, suspension aggregates do not require the complex SERS active substrates, and it is simpler to operate, which also consumes less raw materials. At the same time, its detection intensity is gradually close to that of solid-phase aggregates. Moreover, it can effectively solve t
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