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Successive Deposition of Silver on Silver Nanoplates: Lateral versus Vertical Growth


  • This work was supported in part by a research grant from the NSF (DMR-0804088) and startup funds from Washington University in St. Louis. Y.X. was also partially supported by the World Class University (WCU) program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (R32-20031). Part of the research was performed at the Nano Research Facility (NRF), a member of the National Nanotechnology Infrastructure Network (NNIN), which is funded by the NSF under award no. ECS-0335765. As a jointly supervised student, X.X. was also partially supported by a Fellowship from the China Scholarship Council. P.H. was supported by the NSF Summer Research Program in Solid-State Chemistry and Materials.


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If the cap fits: The epitaxial growth of Ag on Ag nanoplates could be directed to preferentially occur along the lateral or vertical direction by using sodium citrate or poly(vinyl pyrrolidone) (PVP) as capping agents (see picture). The edge length and thickness of the Ag nanoplates could be increased by 100 and 40 times, respectively. Raman scattering signals of Ag nanospheres on the Ag nanoplates were enhanced as the nanoplates became thicker.