Tailoring Molecular Specificity Toward a Crystal Facet: a Lesson From Biorecognition Toward Pt{111}

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• 作者：Lingyan Ruan ; Hadi Ramezani-Dakhel ; Chin-Yi Chiu ; Enbo Zhu ; Yujing Li ; Hendrik Heinz ; Yu Huang
• 刊名：Nano Letters
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：13
• 期：2
• 页码：840-846
• 全文大小：422K
• 年卷期：v.13,no.2(February 13, 2013)
• ISSN：1530-6992

文摘

Surfactants with preferential adsorption to certain crystal facets have been widely employed to manipulate morphologies of colloidal nanocrystals, while mechanisms regarding the origin of facet selectivity remain an enigma. Similar questions exist in biomimetic syntheses concerning biomolecular recognition to materials and crystal surfaces. Here we present mechanistic studies on the molecular origin of the recognition toward platinum {111} facet. By manipulating the conformations and chemical compositions of a platinum {111} facet specific peptide, phenylalanine is identified as the dominant motif to differentiate {111} from other facets. The discovered recognition motif is extended to convert nonspecific peptides into {111} specific peptides. Further extension of this mechanism allows the rational design of small organic molecules that demonstrate preferential adsorption to the {111} facets of both platinum and rhodium nanocrystals. This work represents an advance in understanding the organic鈥搃norganic interfacial interactions in colloidal systems and paves the way to rational and predictable nanostructure modulations for many applications.

Keywords:

Inorganic binding peptides; surfactants; metal nanocrystal; facet specificity; molecular dynamic simulation; organic鈭抜norganic interface