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Abstract
Gold nanoparticles with multiple branches have attracted intensive studies for their application in sensing of low trace molecules. A large number of the merits found on the gold nanoparticles for the above applications are attributed to the strong localized surface plasmon resonance excited by the incident radiation. However, a facile and flexible way of synthesizing the multi-branch gold nanoparticles with tunable localized surface plasmon resonance frequency is still a challenge for the plasmonic research field. Herein, we report an efficient one-pot synthesis of multi-branch gold nanoparticles method that resembles a seed-medicated approach while using no further chemicals except chloroauric acid, ascorbic acid and 4-(2-Hydroxyethyl)-1-piperazinyl]-ethanesulfonic acid. By controlling the amounts of ascorbic acid volumes in the reaction mixture, the morphology and the localized surface plasmon resonance frequency of the synthesized multi-branch gold nanoparticles can be manipulated conveniently. Moreover, using the 4-Mercaptobenzoic acid as the Raman reporter, the multi-branch gold nanoparticles show superior surface-enhanced Raman spectroscopy characteristics that can be potentially used in chemical and biological sensing.
Highlights
Gold nanoparticles have attracted intensive studies for their application in biological sensing, immunoassay and food safety [1,2,3,4,5]
By using the 4-Mercaptobenzoic acid (4-MBA) as the Raman reporter and finite element method (FEM) simulation, the Surface-enhanced Raman scattering (SERS) activities of these AuNBr are experimentally and theoretically investigated; the results indicate that a maximum Raman enhancement factor of
One is the Au seeds mediated branches growth, in which the HEPES is used as the reducing and shape-directing agent; the other one first adding small amount of HEPES into the
Summary
Gold nanoparticles have attracted intensive studies for their application in biological sensing, immunoassay and food safety [1,2,3,4,5]. Plenty of the merits found on the gold nanoparticles for the above applications are ascribed to the strong localized surface plasmon resonance (LSPR) excited on their surface by the incident radiation. Surface-enhanced Raman scattering (SERS) phenomenon observed on nanoparticles results in enhanced Raman scattering signals of the molecules that are chemically bonded or physically adsorbed on them [9]. The principle of the SERS is usually attributed to two well-known mechanisms, i.e., electromagnetic mechanism (EM) and chemical mechanism (CM). EM originates from the enhanced localized electromagnetic field near the nanostructure surface produced by the LSPR, while the CM
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