title: Seed-mediated growth of gold nanocrystals: changes to the crystallinity or morphology as induced by the treatment of seeds with a sulfur species.
abstract: We report our observation of changes to the crystallinity or morphology during seed-mediated growth of Au nanocrystals. When single-crystal Au seeds with a spherical or rod-like shape were treated with a chemical species such as S2O3(2-) ions, twin defects were developed during the growth process to generate multiply twinned nanostructures. X-ray photoelectron spectroscopy analysis indicated that the S2O3(2-) ions were chemisorbed on the surfaces of the seeds during the treatment. The chemisorbed S2O3(2-) ions somehow influenced the crystallization of Au atoms added onto the surface during a growth process, leading to the formation of twin defects. In contrast to the spherical and rod-like Au seeds, the single-crystal structure was retained to generate a concave morphology when single-crystal Au seeds with a cubic or octahedral shape were used for a similar treatment and then seed-mediated growth. The different outcomes are likely related to the difference in spatial distribution of S2O3(2-) ions chemisorbed on the surface of a seed. This approach based on surface modification is potentially extendable to other noble metals for engineering the crystallinity and morphology of nanocrystals formed via seed-mediated growth.
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.
authors.forename: Yiqun
authors.initials: Y
authors.lastname: Zheng
authors.forename: Ming
authors.initials: M
authors.lastname: Luo
authors.forename: Jing
authors.initials: J
authors.lastname: Tao
authors.forename: Hsin-Chieh
authors.initials: HC
authors.lastname: Peng
authors.forename: Dehui
authors.initials: D
authors.lastname: Wan
authors.forename: Yimei
authors.initials: Y
authors.lastname: Zhu
authors.forename: Younan
authors.initials: Y
authors.lastname: Xia
mesh_terms: D003460:Crystallization / Q000379:methods; D006046:Gold / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods; D013457:Sulfur Compounds / Q000737:chemistry*
chemical_list: D013457:Sulfur Compounds; D006046:Gold