Abstract
A laser forward transfer technique of gold nanoparticles (GNPs) deposited on glass substrates to silicon wafers and periodic patterning of transferred GNPs is demonstrated. Gold colloidal solution was prepared by citric acid reduction method. The GNPs were deposited by immersing glass substrates derivatized with (3-aminopropyl) trimethoxysilane (APTMS) in the gold colloidal solution for 0.5 h - 3 h. Dispersed or aggregated GNPs were deposited by using Gold colloidal solution with different concentrations. The glass substrate deposited with the GNPs was placed on a Si substrate. The GNPs deposited side was faced to the Si substrate. Then GNPs were illuminated with the second harmonic wave of Nd : YAG laser through the glass, as a result the gold nanoparticles were transferred to the Si substrate. The GNPs deposited on the silicon surface was sphere and dispersed, nevertheless, they were aggregated on the glass surface before transferring by the laser illumination. After the illumination of the Nd : YAG laser to the silicon surface with the GNPs, the periodic deposition of Au was observed. The periodic spacing of the Au were depended on the wavelength and incident angle of the laser beam.
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