期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 330, 期 1, 页码 211-219出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2008.10.027
关键词
Wet chemical synthesis; Two-dimensional nanostructures; Driving force; Layer-by-layer growth; Kinetic control
资金
- Department of Science and Technology (DST)
- Institute Nanoscience Initiative at the Indian Institute of Science, Bangalore
Understanding shape control during wet chemical synthesis is important for rational synthesis of nanostructures. Here, we show that two-dimensional metal structures can be obtained from metal salts by reducing the driving force of the reduction reaction that directly translates to the growth of the metal taking place by the two-dimensional nucleation (layer-by-layer growth) mechanism. Experimental evidence is provided for Au, Ag, Pt and Pd systems by choosing appropriate reaction conditions without using any external surfactant. The results are analyzed in terms of the calculations of driving force under The results show that surfactants may not be important for producing shape control different: conditions. for the case of 2-D structures while they are required to obtain size control. It is shown that the regime of low driving force is also one where the kinetics of the process is slow and thus a new interpretation of the kinetic control hypothesis is provided. (C) 2008 Elsevier Inc. All rights reserved
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