作者: | Zeke Liu1,2, Yaxu Zhong2, Ibrahim Shafei2, Ryan Borman2, Soojin Jeong2, Jun Chen2, Yaroslav Losovyj2, Xinfeng Gao2, Na Li3,4, Yaping Du4,5, Erik Sarnello6, Tao Li6,7, Dong Su3, Wanli Ma*,1 & Xingchen Ye*,2
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单位: | 1Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, China. 2Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States. 3Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States. 4Frontier Institute of Science and Technology jointly with College of Science, Xi’an Jiaotong University, Xi'an, Shanxi Province, 710054, China. 5School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, China. 6Department of Chemistry and Biochemistry, Northern Illinois University, 1425 W. Lincoln Hwy., DeKalb, IL, 60115, USA. 7X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States.
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摘要: | Metal-oxide nanocrystals doped with aliovalent atoms can exhibit tunable infrared localized surface plasmon resonances (LSPRs). Yet, the range of dopant types and concentrations remains limited for many metal-oxide hosts, largely because of the difficulty in establishing reaction kinetics that favors dopant incorporation by using the co-thermolysis method. Here we develop cation-exchange reactions to introduce p-type dopants (Cu+, Ag+, etc.) into n-type metal-oxide nanocrystals, producing programmable LSPR redshifts due to dopant compensation. We further demonstrate that enhanced n-type doping can be realized via sequential cation-exchange reactions mediated by the Cu+ ions. Cation-exchange transformations add a new dimension to the design of plasmonic nanocrystals, allowing preformed nanocrystals to be used as templates to create compositionally diverse nanocrystals with well-defined LSPR characteristics. The ability to tailor the doping profile postsynthetically opens the door to a multitude of opportunities to deepen our understanding of the relationship between local structure and LSPR properties.
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