Thiol-Frozen Shape Evolution of Triangular Silver Nanoplates

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• 作者：Xuchuan Jiang ; Qinghua Zeng ; Aibing Yu
• 刊名：Langmuir
• 出版年：2007
• 出版时间：February 13, 2007
• 年：2007
• 卷：23
• 期：4
• 页码：2218 - 2223
• 全文大小：283K
• 年卷期：v.23,no.4(February 13, 2007)
• ISSN：1520-5827

文摘

The structural and optical stability of nanoparticles directly influences their applications. The shape evolution ofsilver nanoplates synthesized in the presence of bis(2-ethylhexyl) sulfosuccinate (AOT) could be effectively frozenusing thiols in aqueous solution. These thiols (e.g., 1-hexanethiol, 1-octanethiol, 1-dodecanethiol, and 1-hexadecanethiol)exhibit stronger surface affinity on the silver crystalline surfaces. This is evidenced from both the unchanged shape/sizeof nanoplates and their unshifted plasmon resonances in optical absorption. To quantitatively explain the thiol-frozenshape evolution mechanism of silver nanoplates at molecular scale, molecular dynamics simulation was performed.The results show that these thiols exhibit larger interaction energies than AOT molecules on the silver atomic surfacesand hence freeze the shape evolution of silver nanoparticles. This thiol-frozen strategy would not only be useful forstabilizing nanoparticles but would also allow the introduction of a wide range of surface chemical functionalitiesto the nanoparticles for potential applications in nanosensors.