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The Design And Performance Of Surface Enhanced Raman Spectroscopy Substrate Of Ag And Au

Posted on:2017-04-12Degree:MasterType:Thesis
Country:ChinaCandidate:L ZhangFull Text:PDF
GTID:2271330503482037Subject:Optics
Abstract/Summary:PDF Full Text Request
Surface-Enhanced Raman Scattering(SERS), is a surface enhancement effect with rough surface, to enhance the Raman signal. It has a good effect with ultra-high sensitivity,non-destructive, rapid in the detection, which has gradually developed into an important tool for surface science. Currently, it has found wide applications in food safety,environmental protection, medical testing and nano-science and other fields. During detection process, substrate is a key factor determining the enhanced performance. So studying the law of SERS substrate signal enhancement and developing new high performance SERS substrate become hot issues. In recent years, in order to achieve process simple, low cost, and enhance SERS substrate, activities in the substrate and properties of natural and artificial preparation of the surface-enhanced Raman scattering(SERS) has been reported domestically and internationally. Aiming at this problem, we carry out the theoretical simulation about electric field enhancing effect of rice-like silver nanoparticles structure, and the performance test of new gold / dragonfly wings biological substrate. The main contents are as follows:Firstly, making a brief introduction about the principle of three-dimensional finite difference time domain method(3D-FDTD), several calculation methods while enhancing the common factor of the local field is also introduced. Using the 3D-FDTD method to numerically analysis rice-like silver nanoparticles of different structures, analysis about the particle size, the number of particles, the spacing between the particles of silver nano-enhanced rice-like regularity of the local electric field.Secondly, the paper designs the preparation of gold nanoparticles. By adjusting the amount of reactants, gold nanoparticles were prepared with different radius. As the basis for preparation of gold / dragonfly wings substrate is completed. Using rhodamine 6G(R6G) as a probe molecule, to prepare a new substrate Raman signal performance testing.At last, Using 3D-FDTD method to simulate enhanced capacity of gold / dragonfly wings. Settings the model which similar to experimental prepared gold / dragonfly wings structure, each model has been calculated maximum local electric field. We analysis theperformance of this substrate from theoretical and experimental aspects.
Keywords/Search Tags:Surface enhanced Raman scattering, 3-D finite difference time domain, rice-like silver nanoparticles, gold / dragonfly wings
PDF Full Text Request
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