التفاصيل البيبلوغرافية
| العنوان: |
Cysteine-induced growth of jagged gold bipyramids from penta-twinned nanorod seeds. |
| المؤلفون: |
Hu, Jianwei, Li, Lingzhi, Zou, Yu, Fan, Zhaochuan, Jiang, Jiang |
| المصدر: |
Journal of Chemical Physics; 5/28/2024, Vol. 160 Issue 20, p1-9, 9p |
| مصطلحات موضوعية: |
NANORODS, MOLECULAR dynamics, GOLD, GOLD compounds, SEEDS |
| مستخلص: |
The understanding on the growth mechanism of complex gold nanostructures both experimentally and theoretically can guide their design and fabrication toward various applications. In this work, we report a cysteine-directed overgrowth of penta-twinned nanorod seeds into jagged gold bipyramids with discontinuous stepped {hhk} facets. By monitoring the growth process, we find that {hhk} facets with large k/h values (∼7) are formed first at two ends of the nanorods, followed by the protrusion of the middle section exposing {hhk} facets with smaller indices (k/h ∼ 2–3). Molecular dynamics simulations indicate that the strong adsorption of cysteine molecules on {110} facets is likely responsible for the formation of stepped {hhk} facets, and the stronger adsorption of cysteine molecules on {hhk} facets with smaller k/h compared to that on {hhk} facets with larger k/h is a possible cause of the discontinuity of {hhk} facets at the middle of gold bipyramids. The obtained jagged gold bipyramids display large field enhancement under illumination due to their sharp nanostructures, demonstrating their application potentials in surface-enhanced spectroscopy and catalysis. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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