摘要
當粒子的大小縮至極小時，可應用的範圍會因為其特性而大幅增廣。研究指出多種利用還原劑與保護劑的化學還原反應可用來合成金屬奈米團簇。在此研究中，在不使用還原劑及穩定劑情況下，以極強的飛秒雷射照射在水溶液中的金屬離子中合成出銀奈米團簇(AgNCs)。 不同於一般尺寸的物質，極小的奈米物質確實表現出高表面積及量子尺寸效應的特性。此研究也以對硝基苯酚(4-NP)的降解來對銀奈米團簇在雲母上的催化特性進行探究。短暫鐳射照射產生的微型裸面金屬奈米團簇可達成高催化效率。
此外，銀奈米團簇在飛秒雷射照射程序後沈積於纖維素奈米纖維(CNF)上。纖維素奈米纖維上銀奈米團簇的形成與分佈可藉由Ｘ射線光電子能譜儀及場發射掃描電子顯微鏡能譜儀來測定。製備好充滿銀奈米團簇纖維的對硝基苯酚降解效率則達到銀奈米團簇催化雲母相似的反應速率

Abstract
When the particles’ size is reduced to be very small, the scope of their applications would expand widely due to their unique properties. Then the synthesis of metal nanoclusters has been reported through various chemical reductions where reducing agents and protecting agents were utilized. In this study, silver nanoclusters (AgNCs) were synthesized by irradiating a highly intense femtosecond laser to metal ions in an aqueous solution without reducing and stabilizing agents. Ultra-small nanomaterial indeed exhibits characteristic properties of their extremely high surface area and quantum size effects different from those of bulk counterpart. The catalytic properties of silver nanoclusters on mica were investigated by the degradation of 4-nitrophenol (4-NP). The excellent catalytic efficiency was achieved by metal nanoclusters with bare surface and smaller sizes which was produced by shorter laser irradiation.
Additionally, silver nanoclusters were deposited on cellulose nanofiber (CNF) filament by a femtosecond laser irradiation procedure. The formation and distribution of silver nanoclusters on CNF filament was determined by X-ray photoelectron spectroscopy and field emission scanning electron microscope-energy dispersive spectroscopy. The 4-NP degradation efficiency of an as-prepared silver nanocluster loaded filament achieved a similar reaction rate to that of catalyst on mica.

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