Recent Developments in Shape-Controlled Synthesis of Silver Nanocrystals

• Type of Material: Article
• Authors: Xiaohu Xia, Georgia Institute of Technology; Jie Zeng, University of Science & Technology of China; Qiang Zhang, Emory University; Christine H. Moran, Georgia Institute of Technology; Younan Xia, Georgia Institute of Technology
• Language: English
• Date: 2012-10-18
• Publisher: American Chemical Society
• Publication Version: Author Accepted Manuscript (After Peer Review)
• Copyright Statement: © 2012 American Chemical Society.
• Final Published Version (URL): http://dx.doi.org/10.1021/jp306063p
• Title of Journal or Parent Work: Journal of Physical Chemistry C
• ISSN: 1932-7447
• Volume: 116
• Issue: 41
• Start Page: 21647
• End Page: 21656
• Grant/Funding Information: X.X. and Q.Z. were also partially supported by Fellowships from the China Scholarship Council.; The work was partially supported by the NSF (DMR, 1104614 and 1215034), the NIH (NCI, R01 CA13852701), a NIH Director’s Pioneer Award (DP1 OD000798), and startup funds from Georgia Institute of Technology.
• Keywords: SURFACE-PLASMON RESONANCE; ENHANCED RAMAN-SCATTERING; Science & Technology - Other Topics; Technology; Physical Sciences; HIGH-ASPECT-RATIO; POLY(VINYL PYRROLIDONE); OPTICAL-PROPERTIES; Materials Science, Multidisciplinary; Chemistry, Physical; Science & Technology; Chemistry; SEED-MEDIATED SYNTHESIS; QUANTITATIVE-ANALYSIS; CONCAVE SURFACES; METAL NANOCRYSTALS; Materials Science; WET CHEMICAL SYNTHESIS; Nanoscience & Nanotechnology
• Research Categories: Engineering, Biomedical; Biophysics, General; Chemistry, Biochemistry

Abstract

This feature article introduces our recent work on understanding the roles played by citrate and poly(vinyl pyrrolidone) (PVP) as capping agents in seed-mediated syntheses of Ag nanocrystals with controlled shapes. We have demonstrated that citrate and PVP selectively bind to Ag(111) and Ag(100) surfaces, respectively, and thus favor the formation of Ag nanocrystals enclosed preferentially by {111} or {100} facets. In addition, we have quantified the coverage density of PVP adsorbed on the surface of Ag nanocubes. On the basis of the mechanistic understanding, a series of Ag nanocrystals with controlled shapes and sizes have been successfully synthesized by using different combinations of seeds and capping agents: single-crystal spherical/cubic seeds with citrate for cuboctahedrons and octahedrons or with PVP for cubes and bars and plate-like seeds with citrate for enlarged thin plates or with PVP for thickened plates.