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Giant Emission Enhancement of Solid-State Gold Nanoclusters by Surface Engineering |
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| Authors: | Dr Chuanhao Yao Dr Cong-Qiao Xu Dr In-Hyeok Park Dr Meng Zhao Ziyu Zhu Dr Jing Li Dr Xiao Hai Hanyan Fang Yong Zhang Gennevieve Macam Dr Jinghua Teng Dr Lin Li Dr Qing-Hua Xu Prof Feng-Chuan Chuang Dr Junpeng Lu Dr Chenliang Su Prof Jun Li Dr Jiong Lu |
| Institution: | 1. SZU-NUS Collaborative Center and International Collaborative Laboratory of 2D Materials for Optoelectronic Science & Technology of Ministry of Education, Engineering Technology Research Center for 2D Materials Information Functional Devices and Systems of Guangdong Province, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060 China;2. Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055 China;3. Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543 Singapore;4. Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore, 138634 Singapore;5. School of Physics, Southeast University, Nanjing, 211189 China;6. Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424 Taiwan;7. Shaanxi Key Laboratory of Flexible Electronics (KLoFE), Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072 China |
| Abstract: | Ligand-induced surface restructuring with heteroatomic doping is used to precisely modify the surface of a prototypical Au25(SR1)18]− cluster ( 1 ) while maintaining its icosahedral Au13 core for the synthesis of a new bimetallic Au19Cd3(SR2)18]− cluster ( 2 ). Single-crystal X-ray diffraction studies reveal that six bidentate Au2(SR1)3 motifs (L2) attached to the Au13 core of 1 were replaced by three quadridentate Au2Cd(SR2)6 motifs (L4) to create a bimetallic cluster 2 . Experimental and theoretical results demonstrate a stronger electronic interaction between the surface motifs (Au2Cd(SR2)6) and the Au13 core, attributed to a more compact cluster structure and a larger energy gap of 2 compared to that of 1 . These factors dramatically enhance the photoluminescence quantum efficiency and lifetime of crystal of the cluster 2 . This work provides a new route for the design of a wide range of bimetallic/alloy metal nanoclusters with superior optoelectronic properties and functionality. |
| Keywords: | Atomare Präzision Emissionsverstärkung Goldnanocluster Oberflächengestaltung |