Growth mechanisms of Ag and Cu nanodendrites via Galvanic replacement reactions
| Autor: | Alister S. Goodfellow, Wuzong Zhou, Helena G. Lancaster, Jialu Chen, Sarah M.D. Hall, Jemima J. Davies, Cameron J. Rhodes, Xinyu Liu |
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| Přispěvatelé: | University of St Andrews. School of Chemistry, University of St Andrews. EaSTCHEM |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Silver nanodendrite
Materials science Stacking chemistry.chemical_element Crystal growth 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Copper nanodendrite Crystal Metal law Electron microscopy lcsh:TA401-492 General Materials Science QD Crystallization Stacking fault DAS 021001 nanoscience & nanotechnology QD Chemistry Copper 0104 chemical sciences Amorphous solid Crystallography chemistry visual_art visual_art.visual_art_medium lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology |
| Zdroj: | Progress in Natural Science: Materials International, Vol 31, Iss 1, Pp 141-151 (2021) |
| ISSN: | 1002-0071 |
| Popis: | JLC thanks Chinese Scholarship Council and University of St Andrews for financial support. Dendritic silver and copper crystals were produced via Galvanic replacement reactions on zinc and aluminum plates, respectively. The growth orientations of these metals were determined using electron microscopy. The results showed that a fast crystal growth associated with a high concentration of metal cations led to kinetically controlled growth along the axes of the cubic close-packed structures. However, a slow growth rate resulted in thermodynamically controlled growth along the [111] axis. The crystal growth was not found to rely upon the direct deposition of metal cations at crystallographic sites on crystal facets, but instead, hydrated metal cations deposited on the crystal surface to form an amorphous coating layer, followed by the reduction of metal cations and crystallization at the crystal/coating interface. Twin defects and stacking faults were often observed across the whole particle and commonly observed ⅓{422} diffraction spots were explained by stacking faults rather than by the possible presence of any superstructures. The present work offers evidences to claim that both the crystal growth rate and Coulomb interaction between negatively charged crystal surface and metal cations play an important role in the formation of metal dendrites in replacement reactions. Publisher PDF |
| Databáze: | OpenAIRE |
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