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Layer-by-layer alloying of NIR-Ⅱ emissive M50(Au/Ag/Cu)superatomic nanocluster

Nano Research 2022年第6期15卷 5569-5574页

作者： Xiao-Hong Ma Jing-Tao Jia Peng Luo Zhao-Yang Wang Shuang-Quan Zang Thomas C.W.Mak Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster MaterialsGreen Catalysis Centerand College of ChemistryZhengzhou UniversityZhengzhou 450001China Department of Chemistry The Chinese University of Hong KongHong Kong 999077China

The intermetallic synergy plays a critical role in exploring the chemical-physical properties of metal ***,the controlled doping or layer-by-layer alloying of atom-precise metal nanoclusters(NCs)has long been a challenging *** this work,two novel alloy nanoclusters[PPh_(4)]_(4)[Ag_(32)Cu_(18)(PFBT)_(36)]((AgCu)_(50))and[PPh_(4)]_(4)[Au_(12)Ag_(20)Cu_(18)(PFBT)_(36)](Au_(12)(AgCu)_(38)),where PFBT is pentafluorobenzenethiolate,with shell-by-shell configuration of M_(12)@Ag_(20)@Cu_(18)(PFBT)_(36)(M=Ag/Au)were synthesized by a facile one-pot co-reduction ***,a fingerprint library of[Ag_(50)−xCux(PFBT)_(36)]^(4−)(x=0 to 50)from Ag_(50)to Cu_(50)has been successfully established as revealed by electrospray ionization mass ***-crystal X-ray diffraction analysis of trimetallic Au_(12)(AgCu)_(38)confirmed the layer-by-layer alloying under reducing *** is more,(AgCu)_(50)and Au12(AgCu)_(38)both show broad photoluminescence(PL)peak in the second near-infrared(NIR-II)window,and the Au doping in the innermost shell considerably enhances the photoluminescence *** work not only offers an insight in the process of metal cluster alloying but also provides a platform to study the doping-directed PL properties in the multimetallic cluster system.

关键词： alloy nanocluster second near infrared(NIR-II)emission superatom doping

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Influence of composition and size on the thermodynamic stability and structural evolution of CuAlNi nanoclusters

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Progress in Natural Science:Materials International 2020年第4期30卷 477-484页

作者： Qing Liu Ye Su Keke Song Xiaoxu Wang Panpan Gao Chutian Wang Yuqin Xiao Xiaodong Jian Ping Qian Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interfere Science School of Mathematics and Physics University of Science and Technology Beijing National Supercomputer Center in Tianjin

The heating process for CuAlNi nanoclusters with cuboctahedral structure was studied by molecular dynamics simulation with the embedded atom method. A diffusionless martensitic transformation from the cuboctahedral(CO) to the icosahedral(ICO) structure before the melting point was found in some CuAlNi nanoclusters. The effects of element composition and cluster size on the thermodynamic stability and structural transformation of trimetallic nanoclusters were investigated. The results show that the CO–ICO transformation temperature was size-dependent and occurred only for small clusters. It was also observed that the CO–ICO transformation temperature firstly dropped and then raised as Al concentration increased, which may be strongly related to the release of excess energy. Furthermore, the surface segregation phenomenon was also observed that the lower surface energy components, such as Al and Cu atoms, segregated to the surface of CuAlNi nanoclusters. The changes in the melting points of Cu Al Ni nanoclusters with different alloy compositions and cluster sizes were also studied. And furthermore, the physical basis of structural transition of CuAlNi nanoclusters was discussed.

关键词： MD simulation Structural transformation Thermodynamic stability alloy nanocluster Size effect

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Synthesis and structure of Au_(19)Ag_4(S-Adm)_(15) nanocluster:Polymorphs and optical properties

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Chinese Chemical Letters 2021年第1期32卷 565-568页

作者： Xuemei Fu Xinzhang Lin Xiuqing Ren Hengjiang Cong Chao Liu Jiahui Huang Gold Catalysis Research Center State Key Laboratory of CatalysisDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China College of Chemistry and Molecular Sciences Engineering Research Center of Organosilicon Compounds&MaterialsMinistry of EducationWuhan UniversityWuhan 430072China

Polymorphism is a common phenomenon in ***,we report one-pot wet chemical method to synthesize two polymorphs of Au_(19)Ag_(4)(S-Adm)_(15) nanocluster protected by 1-adamantanethiol(HSAdm),which adopt P-1 and P2_(1)/c space group *** crystal structures of two polymorphs were determined by X-ray *** to the previously reported Au_(19)Ag_(4)(S-Adm)_(15)nanocluster adopting P2_(1)/n space group,polymorphs of Au_(19)Ag_(4)(S-Adm)_(15) with P-1 and P2_(1)/c space group show the different optical *** r,Au_(19)Ag_(4)(S-Adm)_(15) with P-1 space group exhibits good thermal ***,we investigated the effect of solvent and molar ratio of metal precursors on the *** work provides an insight to polymorphs of metal nanoclusters.

关键词： Au_(19)Ag_4(S-Adm)_(15) alloy nanocluster Polymorph Fluorescence Thermal stability

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Aggregation of Surface Structure Induced Photoluminescence Enhancement in Atomically Precise nanoclusters

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CCS Chemistry 2021年第7期3卷 1929-1939页

作者： Xiao Wei Xi Kang Shan Jin Shuxin Wang Manzhou Zhu Department of Chemistry Centre for Atomic Engineering of Advanced MaterialsAnhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized MaterialsAnhui UniversityHefei 230601 Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Anhui UniversityHefei 230601

Although intermolecular aggregation-induced emission(AIE)has been extensively studied in nanocluster science,it remains challenging to activate AIE via intracluster aggregation(i.e.,the aggregation at the single-molecular level).Here,an intracluster AIE system based on the Pt_(1)Ag_(24)(SR)18 nanocluster has been ***,triggered by the addition of free thiol ligands,the Ag_(2)(SR)_(3)surface motif structures of Pt_(1)Ag_(24)(SR)18 are aggregated to nanocluster poles.

关键词： aggregation-induced emission atomically precise nanocluster photoluminescence alloy nanocluster structural interconversion

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