Shape‐Controlled Synthesis of Metal Nanostructures: The Case of Silver
Tóm tắt
The concept of shape‐controlled synthesis is discussed by investigating the growth mechanisms for silver nanocubes, nanowires, and nanospheres produced through a polymer‐mediated polyol process. Experimental parameters, such as the concentration of AgNO3 (the precursor to silver), the molar ratio between poly(vinylpyrrolidone) (PVP, the capping agent) and AgNO3, and the strength of chemical interaction between PVP and various crystallographic planes of silver, were found to determine the crystallinity of seeds (e.g., single crystal versus decahedral multiply twinned particles). In turn, the crystallinity of a seed and the extent of the PVP coverage on the seed were both instrumental in controlling the morphology of final product. The ability to generate silver nanostructures with well‐defined morphologies provides a great opportunity to experimentally and systematically study the relationship between their properties and geometric shapes.
Từ khóa
Tài liệu tham khảo
Schmidt G., 1998, Adv. Mater., 10, 515, 10.1002/(SICI)1521-4095(199805)10:7<515::AID-ADMA515>3.0.CO;2-Y
M.Figlarz F.Fiévet J. P.Lagier Reduction of Metal Compounds to Metal Powders by Polyols. US Patent4 539 041 Dec 20 1983;
Jones W. S., 1952, Glycols, 38
Mullin J. W., 1997, Crystallization
2000, Light Scattering by Nonspherical Particles
Sands D. E., 1993, Introduction to Crystallography, 51
Schatz G. C., 1984, Acc. Chem. Res., 17