Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 179, Issue 11, Pages 3270-3276Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2006.06.022
Keywords
core-shell structure; Ag coating; surface seeding and shell growth; one-pot reaction
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In this paper, an improved surface seeding and shell growth technique was developed to prepare Ag-polystyrene core shell composite. Polyethyleneimine (PEI) could act as the linker between Ag ions (Ag nanoparticles) and polystyrene (PS) colloids and the reducing agent in the formation of Ag nanoparticles. Due to the multi-functional characteristic of PEI, Ag seeds formed in-situ and were immobilized on the surface of PEI-modified PS colloids and no free Ag clusters coexist with the Ag seeding PS colloids in the system. Then, the additional agents could be added into the resulting dispersions straightly to produce a thick Ag nanoshell. The Ag nanoshell with controllable thickness was formed on the surface of PS by the one-pot surface seeding and shell growth method. The Ag-coverage increased gradually with the increasing of mass ratio of AgNO3/PS. The optical properties of the Ag-PS colloids could be tailored by changing the coverage of Ag. (c) 2006 Elsevier Inc. All rights reserved.
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