The Fabrication And SERS Research Of Cu/Ni Core/Shell Nanocable Arrays

Surface enhanced Raman spectroscopy (SERS) as one of the most sensitive detection spectroscopy technologies of surface substance, can not only enhance the intensity of the Raman signals, but also provide plentiful information about the adsorbed molecules. The SERS technique is being applied widely in various scientific fields, especially the field of life science. The application of SERS technology is based on active substrate, and thus the preparation of high-quality SERS active substrate is one of the research focuses about SERS effect. The special structure of coaxial nanocable provides new ideas for the preparation of SERS substrate and it is becoming gradually a high-performance SERS substrate material to be studied widely.In this thesis, a novel SERS substrate of Cu/Ni core/shell nanocable arrays was fabricated by electrochemical deposition and controlled pore-widening method using anodic aluminum oxide (AAO) template. SERS test was applied to this active substrate and the relevant SERS mechanism was also analyzed.The main research works and related results were listed as the followings.1. The desired AAO template was prepared finally by two steps method and the adjustment of experimental conditions.2. Using DC electrodeposition technique, CuNWs and NiNWs were prepared in AAO template, and their growth rates were explored and obtained finally.3. Cu/Ni core/shell nanocable arrays were fabricated successfully through four stages of the preparation of AAO template, electrochemical deposition of Cu nanowires, pore-widening process to Cu/Al2O3 composite structure and electrodeposition of cylindrical Ni layers. A series of characteristic approaches were adopted to analyze the structure of Cu/Ni core/shell nanocable arrays.4. Ni/Cu shell/core nanocable arrays active substrate was prepared and its SERS performance was tested. Compare with CuNW or NiNW arrays, Cu/Ni core/shell nanocable arrays indicate more significant enhancement effect for 10-4M adenine and its SERS enchancement mechanism was studied. Furthermore, Ni/Cu shell/core nanocable arrays active substrate still revealed obvious Raman enchancement competence in 10-9 M adenine. The fact that so low concentrations still showed such a good SERS effect implied that this substrate had a high enhancement competence.In summary, by combination of SERS and core/shell metal nanocables, the scope of application of SERS is broaden and the SERS spectra are found can be used in the study of substance on the surface of transition metal. The core/shell nanocables array with special features of can be used as a better SERS substrate, at the same time can be used as a highly sensitive of SERS for biological separation and detection research.