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Study of Novel SERS Active Substrates and C60 Modified Bilayer Lipid Membrane （BLM）

Author: GaoMei
Tutor: FangYan
School: Capital Normal University
Course: Optics
Keywords: Raman spectroscopy Surface-enhanced Raman scattering ( SERS ) Silver nanostructures SERS active substrates P-hydroxybenzoic acid (PHBA) Silver plastic C60 Bilayer membrane (s-BLM)
CLC: O561.3
Type: Master's thesis
Year: 2008
Downloads: 74
Quote: 0
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Abstract


Photon-probe Raman spectroscopy is a non-destructive testing techniques, it is directly linked to the vibration spectrum of the molecular structure of substances fingerprint certification. Any of the material structure will be very sensitive to small changes reflected in Raman spectroscopy and Raman spectroscopy, and thus in the field of substance identification, molecular structure, quality control, and cultural archaeological gem identification physics, chemistry, life science research has been widely Application. However, the Raman signal obtained is not easy, until discovery of SERS scattering cross-section the considerable enhancements (106-1014), so that the sensitivity has been greatly improved. Important factors is whether the SERS effect can occur and SERS signal strength of the substrate surface morphology of the molecular adsorption of molecules bearing matrix is ??critical, therefore SERS active substrates has been the hot research field. Usually obtain SERS method is mainly Several precious metals: gold, silver, copper colloids and having a roughened surface of the nano-scale (e.g. vacuum vapor deposition, and mechanical polishing of the metal surface). However, in practical applications, the SERS enhancement substrate and they all have advantages and disadvantages and limitations. For the colloid prepared by chemical methods, the easy preparation and very easy to obtain a large number of colloidal, but its composition is complex and containing a large amount of impurities. This has brought a lot of inconvenience to the use of the experimental system and spectral analysis. Although the colloid obtained by the laser ablation method of high purity, but the yield is low, the cost is high. Also obtained using methods such as chemical etching, physical polishing the rough surface of the existence of residual impurities, roughness is not easy to control and other shortcomings. So we want to study a simple, easy to control, good reproducibility and application of a wide range of new SERS active substrates. This article using the pretreatment of aluminum and copper to restore the silver nitrate solution obtained by the method of silver nano-structures with different surface morphologies. Fig of the scanning electron microscope (SEM) showed that the reaction product of the silver nano-structure pattern and dendritic. Hydroxybenzoate (PHBA) as a probe molecule, this new system of surface-enhanced Raman scattering (SERS) activity, found that the system is a very efficient SERS activity enhanced basal and SERS activity better than chemically prepared silver plastic. Also enhanced mechanism of this novel SERS-active substrate discussed and considered to be the result of electromagnetic enhancement and chemical enhancement coact. At the same time, we hope that this simple method can be extended to other metal to prepare novel nanostructures, to help expand the application and further explain the theory of SERS SERS mechanism and further promote applied to electronics, magnetic The research area of ??the catalyst, chemical, biological sensors, optical and microfluidic devices. Finally, we combined Raman and electrochemical methods spectroscopic characteristics of bilayer lipid membranes modified C6 0. Obtain good cyclic voltammogram, to ensure good premise state of the lipid membrane, while the collection of the Raman signal, observe the deposition Hou Laman signal changes. This can reveal the mechanism of the interaction of the C60 molecule and bilayer lipid membranes, is of great significance for further discussion of the C60 modified BLM sensing mechanism.

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CLC: > Mathematical sciences and chemical > Physics > Molecular physics, atomic physics > Molecular Physics > Molecular spectroscopy
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