Mechanistic Insight into DNA-Guided Control of Nanoparticle Morphologies.
Although shapes and surface characteristics of nanoparticles are known to play important roles in defining their properties, it remains challenging to fine-tune the morphologies systematically and predictably. Recently, we have shown that DNA molecules can serve as programmable ligands to fine-tune...
| Published in: | Journal of the American Chemical Society Vol. 137; no. 45; pp. 14456 - 14465 |
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| Main Authors: | , , , , , , |
| Format: | Article |
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American Chemical Society
11/18/2015
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| Subjects: | |
| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=111339831&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 111339831 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 11/18/2015 vid: 137 iid: 45 pid: 997 pub: American Chemical Society artinfo: ui: 111339831 10.1021/jacs.5b09567 ppf: 14456 ppct: 9 formats: tig: atl: Mechanistic Insight into DNA-Guided Control of Nanoparticle Morphologies. aug: au: Li Huey Tan Yuan Yue Nitya Sai Reddy Satyavolu Ali, Arzeena Sultana Zidong Wang Yuqing Wu Yi Lu affil: Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, PR China su: Gold nanoparticles DNA Molecules Nanostructured materials Desorption Cyclic voltammetry sug: subj: Gold nanoparticles DNA Molecules Nanostructured materials Desorption Cyclic voltammetry ab: Although shapes and surface characteristics of nanoparticles are known to play important roles in defining their properties, it remains challenging to fine-tune the morphologies systematically and predictably. Recently, we have shown that DNA molecules can serve as programmable ligands to fine-tune the morphologies of nanomaterials. Despite this discovery, the mechanism of how the morphology can be controlled and the roles of the DNA molecules in contributing to such control are not understood. We herein report mechanistic investigation of DNA-mediated morphological evolution of gold nanoprism seeds into nonagon, hexagon, and six-pointed stars, some of which display rough surfaces, in the presence of homo-oligomeric T30, G20, C30, and A30. The growth, elucidated through various analytical methods including UV-vis, SEM, TEM, zeta potential, fluorescence, and cyclic voltammetry, is found to occur in two stages: control of shape, followed by control of thickness. A careful analysis of diffraction patterns of the nanoprism seeds as well as the resulting intermediate shapes by TEM allowed us to deduce the exact sequence of shape evolution. Through systematic comparison of the nanoparticle growth process, the DNA molecules were found to play important roles by influencing diffusion of the Au precursor to the seed and modulating the growth through differences in DNA desorption, density, and mobility on the seed surface. These insights into the mechanism of DNA-guided control of nanomaterial morphologies provide deeper understanding of the interactions between the DNA and nanomaterials and will allow better control of the shapes and surface properties of many nanomaterials. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2015 holdings: @attributes: islocal: N |
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