Abstract
High-throughput synthesis of selenium (Se) nanoparticles in the form of colloidal solutions was carried out by 1030 nm laser ablation of a bulk Se target in deionized water and isopropyl alcohol by laser pulses of variable pulse widths (0.3–8.6 ps). The extinction coefficient of the colloidal solutions exhibits an overall decreasing trend with the increase of the laser pulse width in deionized water, also demonstrating a local minimum at 2–4 ps. This can be explained by the growing ablation thresholds, related to the bigger impact of thermal processes during the transition from femto- to picosecond temporal stages.
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