Silver Cholesteric Liquid Crystalline: Shape-Dependent Assembly and Plasmonic Chiroptical Response

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• 作者：Xuesi Wang ; Yongcun Zou ; Jingran Zhu ; Yu Wang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：July 11, 2013
• 年：2013
• 卷：117
• 期：27
• 页码：14197-14205
• 全文大小：560K
• 年卷期：v.117,no.27(July 11, 2013)
• ISSN：1932-7455

文摘

A novel silver cholesteric liquid crystalline (CLC) colloidal suspension has been fabricated by a shape-dependent self-assembly process via van der Waals and electrostatic interactions. The circular dichroism (CD) spectra show that the cysteine molecules have a strong effect on the as-obtained silver CLC structure, albeit it is very stable in the presence of many other kinds of amino acid molecules. The original silver CLC structure can be completely dissociated as soon as the concentration of cysteine solution arrives at a critical value. Furthermore, the cysteine molecules can translate their chirality to the silver nanorods (NRs) and silver nanoplates (NPs) by strong S鈥揂g bonds to form two novel chiral silver鈥揷ysteine nanocrystals, respectively. The colloidal suspension of silver鈥揷ysteine hybrid nanorods shows a much stronger CD intensity than the colloidal suspension of silver鈥揷ysteine hybrid nanoplates do, which can be attributed to its unique anisotropy of geometry and superficial constitution.