We demonstrate fabrication of higher-order three-dimensional layer stack nanostructure for molecular detection and electrode. Here, we develop two novel surface enhanced Raman scattering (SERS) platform with three-dimensional nanostructure using competitive self-assembly between convective aggregation and dielectrophoresis. Appropriate conditions are able to provide the higher-order layer stack nanostructure onto the desired area on demand. We measured the photoluminescence (PL) characters of the higher-order layer stack nanostructure. The local surface plasmon resonance is induced on the surface of the higher-order layer stack nanostructure, resulting the enhancement of PL and SERS-activity. We achieved the in situ highly sensitive SERS of analyte using the fabricated higher-order layer stack nanostructure. Our method enables the development of active functional control devices for in situ SERS and solar cell power battery.
The synthesis and deposition of nanoparticles consisting of Cu and Au in a CuSO4 solution with some kinds of alcohol and electroplating solution containing gold (I) trisodium disulphite under synchrotron X-ray radiation was investigated. The functional group of alcohol plays an important in nucleation, growth and aggregation process of copper and cupric oxide particles. We found that the laboratory X-ray source also enables us to synthesize the NPs from the metallic solution. As increasing X-ray exposure time, the full length at half width of particle size distribution is broader and higher-order nanostructure containing NPs clusters is formed. The surface-enhanced Raman scattering (SERS) of 4, 4'-bipyridine (4bpy) in aqueous solution was measured using higher-order nanostructure immobilized on silicon substrates under systematically-varied X-ray exposure. This demonstration provide a clue to develop a three-dimensional printing and sensor for environmental analyses and molecular detection through simple SERS measurements.
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