Synthesis of size tunable monodispersed silver nanoparticles and the effect of size on SERS enhancement |
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| Institution: | 1. Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China;2. State Key Laboratory of Space Medicine Fundamentals and Application, Chinese Astronaut Science Researching and Training Center, Beijing 100094, China;3. Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing 100124, China;4. Key Laboratory of Trans-scale Laser Manufacturing Technology, Beijing University of Technology, Ministry of Education, Beijing 100124, China;5. Advanced Laser Processing Research Team, RIKEN Center for Advanced Photonics, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;6. Department of Mechanical Aerospace and Biomedical Engineering, University of Tennessee Knoxville, 1512 Middle Drive, Knoxville, TN 37996, USA |
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| Abstract: | Spherical and monodispersed silver nanoparticles (AgNPs) are ideal for fundamental research as the contribution from size and shape can be accounted for in the experimental design. In this paper a seeded growth method is presented, whereby varying the concentration of sodium borohydride-reduced silver nanoparticle seeds, different sizes of stable spherical nanoparticles with a low polydispersity nanoparticles are produced using hydroquinone as a selective reducing agent. The surface-enhanced Raman scattering (SERS) enhancement factor for each nanoparticle size produced (17, 26, 50, and 65 nm) was then assessed using three different analytes, rhodamine 6G (R6G), malachite green oxalate (MGO) and thiophenol (TP). The enhancement factor gives an indication of the Raman enhancement effect by the nanoparticle. Using non-aggregated conditions and two different laser excitation wavelength (633 nm and 785 nm) it is shown that an increase in particle size results in an increased enhancement for each analyte used. |
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| Keywords: | Hydroquinone reduction Silver nanoparticle synthesis Surface-enhanced Raman scattering |
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