10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Copper Nanoparticle-based Films Fabricated by Spark Discharge Deposition for Surface-Enhanced Raman Spectroscopy
MOHAMED ABD EL-AAL, Takafumi Seto, Yoshio Otani, Kanazawa University
Abstract Number: 295 Working Group: Materials Synthesis
Abstract Copper nanoparticles were fabricated and deposited on glass substrate by spark discharge of copper rod under atmospheric pressure. The average diameter of the as-prepared Cu primary particles was measured by the TEM to be 3.7 ± 1.2 nm. Thermal annealing of the film induced the growth of the Cu grains from 27 nm at room temperature to 54 nm at 200oC. A water solution of dye molecule (crystal violet) with concentration of 10-6 to 10-8 M was dropped on the prepared Cu substrate. Raman signals from dye molecule were detected and their intensities changed according to spark time, annealing temperature and dye concentration. Significant increase in the Raman scattering signal of dye molecule was observed in the film fabricated at 30 min deposition time with post-annealing temperature of 200°C for 1h. This substrate provides a maximum SERS intensity with a detection limit of 10-8 M, which in the single molecule level with an enhancement factor of 3.9×103. The relationship between the SERS performance of the substrates and their surface morphologies was investigated by the SEM and EDX.
Keywords: Cu nanoparticles; Spark discharge; SERS; Crystal violet.