纳米团簇
荧光
胶体
材料科学
纳米技术
化学
化学工程
物理化学
光学
物理
工程类
作者
Anna Rosa Ziefuß,Michael Willeke,Matthias Miertz,Alexander Heinemann,Christoph Rehbock,Stephan Barcikowski
标识
DOI:10.1002/cphc.202200033
摘要
Noble metal alloy nanoclusters (NCs) are interesting systems as the properties of two or more elements can be combined in one particle, leading to interesting fluorescence phenomena. However, previous studies have been exclusively performed on ligand-capped NCs from wet chemical synthesis. This makes it difficult to differentiate to which extent the fluorescence is affected by ligand-induced effects or the elemental composition of the metal core. In this work, we used laser fragmentation in liquids (LFL) to fabricate colloidal gold-rich bi-metallic AuPt NCs in the absence of organic ligands and demonstrate the suitability of this technique to produce molar fraction series of 1nm alloy NC. We found that photoluminescence of ligand-free NCs is not a phenomenon limited to Au. However, even minute amounts of Pt atoms in the AuPt NCs lead to quenching and red-shift of the fluorescence, which may be attributed to the altered surface charge density.
科研通智能强力驱动
Strongly Powered by AbleSci AI