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Modified Finke–Watzky mechanisms for the two-step nucleation and growth of silver nanoparticles
| Content Provider | Scilit |
|---|---|
| Author | Amirjani, Amirmostafa Haghshenas, Davoud Fatmehsari |
| Copyright Year | 2018 |
| Description | Journal: Nanotechnology In this work, a new modification was made on the Finke−Watzky mechanism for investigating the nucleation and growth steps in the synthesis of silver nanoparticles (AgNPs). UV–Vis spectrophotometery and transmission electron microscopy (TEM) evaluations proved that the former linear form of Finke−Watzky mechanism is not efficient for describing the nucleation and growth steps of AgNPs synthesis. In this manner, the Finke−Watzky mechanism was modified by considering a reversible pseudo first−order reaction for nucleation step. In addition, no assumptions were made in mathematical calculations related to the rate law which were previously adapted by the researchers in this field; i. e. [A]0 > [A] and k2[A] >> k1. These considerations led to develop a kinetic model that is more close to what really occurs within the synthesis system. Kinetics data were obtained in a well-known synthesis process of AgNPs namely as sodium borohydride reduction. Furthermore, it was elucidated that polyvinylpyrrolidone (PVP) retards both the nucleation and growth steps resulting in the isotropic growth of seeds; this effect subtly provides a tunable synthesis process for achieving desired size of AgNPs. Moreover, Fourier−transform infrared spectroscopy (FTIR) revealed that the nitrogen atoms present in the PVP molecules are responsible for the interaction of PVP with AgNPs. |
| Related Links | http://iopscience.iop.org/article/10.1088/1361-6528/aae3dd/pdf |
| ISSN | 09574484 |
| e-ISSN | 13616528 |
| DOI | 10.1088/1361-6528/aae3dd |
| Journal | Nanotechnology |
| Issue Number | 50 |
| Volume Number | 29 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2018-09-24 |
| Access Restriction | Open |
| Subject Keyword | Journal: Nanotechnology Condensed Matter Physics Chemical Synthesis Silver Nanoparticles |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Nanoscience and Nanotechnology Mechanics of Materials Mechanical Engineering Bioengineering Electrical and Electronic Engineering |
