- 作者: 簡建興 ; 葉晨聖
- 作者服務機構: 成功大學化學系
- 中文摘要: The laser ablation technique has been employed to study silver colloidal formation. Laser intensities, irradiation wavelengths(1,064nm and 532nm), and solvents (water, methanol, and isopropanol) were all considered. Changes of the maximum UV-Visible absorbance of the solutions with laser intensities exhibited nonlinear behavior for 1,064nm and 532nm and displayed better ablation efficiency at 532nm. Larger mean sizes were observed at 532nm or at higher pulse energy. For solvent effect, the bigger particle sizes were generated in H/sub 2/O. As to colloidal stability, isopropanol, which has a lower dielectric constant than water, was found to stabilize Ag nanoparticles without protecting reagents over six months. Preliminary results in 2 -butanol suggested that the viscosity of solvent may need to be considered in addition to the dielectric constant.
- 英文摘要: --
- 中文關鍵字: Nanoparticle; Laser Ablation; Colloids; Electrostatic Double Layer; Surface Plasmon Band; Aggregation; Dielectric Constant; Viscosity
- 英文關鍵字: 奈米粒子;雷射蒸鍍;膠體;靜電雙層;表面電漿子鍵;凝集;介電常數;黏度