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    Mechanistic investigation into the spontaneous linear assembly of gold nanospheres

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    Type
    Article
    Authors
    Yang, Miaoxin
    Chen, Gang
    Zhao, Yunfeng cc
    Silber, Georg
    Wang, Yong
    Xing, Shuangxi
    Han, Yu cc
    Chen, Hongyu
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Biological and Environmental Sciences and Engineering (BESE) Division
    Chemical Science Program
    Nanostructured Functional Materials (NFM) laboratory
    Physical Science and Engineering (PSE) Division
    Date
    2010
    Permanent link to this record
    http://hdl.handle.net/10754/561534
    
    Metadata
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    Abstract
    Understanding the mechanism of nanoparticle self-assembly is of critical significance for developing synthetic strategies for complex nanostructures. By encapsulating aggregates of Au nanospheres in shells of polystyrene-block- poly(acrylic acid), we prevent the dissociation and aggregation typically associated with the drying of solution samples on TEM/SEM substrates. In our study of the salt-induced aggregation of 2-naphthalenethiol-functionalized Au nanospheres in DMF, the trapping of the solution species under various experimental conditions permits new insights in the mechanism thereof. We provide evidence that the spontaneous linear aggregation in this system is a kinetically controlled process and hence the long-range charge repulsion at the "transition state" before the actual contact of the Au nanospheres is the key factor. Thus, the charge repulsion potential (i.e. the activation energy) a nanosphere must overcome before attaching to either end of a nanochain is smaller than attaching on its sides, which has been previously established. This factor alone could give rise to the selective end-on attachment and lead to the linear assembly of originally isotropic Au nanospheres. © 2010 the Owner Societies.
    Citation
    Yang, M., Chen, G., Zhao, Y., Silber, G., Wang, Y., Xing, S., … Chen, H. (2010). Mechanistic investigation into the spontaneous linear assembly of gold nanospheres. Physical Chemistry Chemical Physics, 12(38), 11850. doi:10.1039/c0cp00127a
    Sponsors
    The authors thank Ministry of Education, Singapore (ARC 27/07 and 13/09) for financial support.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    Physical Chemistry Chemical Physics
    DOI
    10.1039/c0cp00127a
    ae974a485f413a2113503eed53cd6c53
    10.1039/c0cp00127a
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division; Chemical Science Program

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