Control of laser-induced deposition of gold nanoparticles on glass substrates for localized surface plasmon sensing

The irradiation of a pulsed laser (532 nm 10 Hz, 10 mJ/pulse) on dodecanethiol-passivated gold nanoparticles in cyclohexane resulted in the deposition of gold nanoparticles onto a glass substrate. The mode values and the spreads of the size distribution of the laser-deposited gold nanoparticles could be controlled with the initial size of colloidal gold nanoparticles and the laser irradiation time. The initial gold nanoparticles of 2 nm and the 1-minute laser irradiation resulted in large deposited gold nanoparticles (mode value, 16 nm; distribution spread, 9.1 nm). The larger initial gold nanoparticles (20 nm) and the longer laser irradiation (5 minutes) provided the fragmentized deposition of gold nanoparticles (mode value, 10 nm; distribution spread, 7.7 nm) which showed a linear correlation between the peak shifts of localized surface plasmon bands and the refractive indexes of the surrounding solvents.