Journal
JOURNAL OF CHEMICAL EDUCATION
Volume 97, Issue 1, Pages 239-243Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jchemed.9b00342
Keywords
Nanotechnology; Physical Chemistry; Materials Science; Upper-Division Undergraduate; Interdisciplinary/Multidisciplinary; Fluorescence Spectroscopy; Kinetics; Synthesis; UV-Vis Spectroscopy
Funding
- German Research Foundation [DFG PA 794/28-1/DFG BA 3580/22-1]
- Alexander von Humboldt fellowship
- Chinese Scholarship Council (CSC)
- Ministry of Higher Education and Scientific Research (MHESR) of Egypt
- Deutscher Akademischer Austausdienst (DAAD)
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A laboratory class was developed and evaluated to illustrate the synthesis of metal nanoclusters (NCs) and to explain their photoluminescence properties for the case of silver. The described experiment employs a synthetic protocol that consists of two sequential phases in a single reaction pot: the reduction of silver ions into plasmonic silver nanoparticles (NPs) (bottom-up), followed by etching the formed silver NPs into ultrasmall atomically precise fluorescent silver NCs (top-down), Ag-29(DHLA)(12) (DHLA: dihydrolipoic acid). UV-vis absorption and fluorescence spectroscopy were employed as a function of reaction time to confirm the development of the plasmonic character of silver NPs (reaction intermediate) and, later on, the onset of fluorescence emission of the silver NCs (final product). Collectively, this experiment was found to be simple to carry out, safe, reproducible, and cost-effective, and it achieved the intended learning outcomes. Participating students found this laboratory class suitable to be implemented into an upper-division undergraduate or graduate curriculum.
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