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.
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.