Gold nanoparticles fabricated by pulsed laser ablation in supercritical CO2 |
| |
Authors: | Siti Machmudah Motonobu Goto Wahyudiono Yutaka Kuwahara Mitsuru Sasaki |
| |
Affiliation: | 1. Bioelectrics Research Center, Kumamoto University, Kurokami 2-39-1, Kumamoto, 860-8555, Japan 2. Graduate School of Science and Technology, Kumamoto University, Kurokami 2-39-1, Kumamoto-shi, Kumamoto, 860-8555, Japan
|
| |
Abstract: | Nanosecond pulsed laser ablation (PLA) of gold plate with an excitation wavelength of 532?nm was carried out in supercritical CO2 (scCO2) to fabricate gold nanoparticles. Surface morphology of the gold plate after irradiation and the crater depth after PLA were observed by scanning electron microscopy and laser scanning microscopy, while extinction spectra of gold nanoparticles collected in the glass slide was measured by UV?CVis spectrophotometer. The gold plate was ablated at various scCO2 densities and irradiation times at constant temperature of 40??C. The ablation was also conducted at atmospheric condition with air to evaluate the environmental dependence of ablation. Both surface morphology of the irradiated gold plate and crater depth formation were significantly affected by the changes in scCO2 density, the surrounding environment, and irradiation time. As expected, the increasing scCO2 density resulted in a deeper ablation crater, however, the deepest crater was obtained at a density of 0.63?g/cm3 or pressure of 10?MPa. Gold nanoparticles generated by PLA in scCO2 have been confirmed at the spectra band near 530?nm. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|