Mechanistic investigation into the spontaneous linear assembly of gold nanospheres

Handle URI:
http://hdl.handle.net/10754/561534
Title:
Mechanistic investigation into the spontaneous linear assembly of gold nanospheres
Authors:
Yang, Miaoxin; Chen, Gang; Zhao, Yunfeng; Silber, Georg; Wang, Yong; Xing, Shuangxi; Han, Yu ( 0000-0003-1462-1118 ) ; Chen, Hongyu
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.
KAUST Department:
Advanced Membranes and Porous Materials Research Center; Biological and Environmental Sciences and Engineering (BESE) Division; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Nanostructured Functional Materials (NFM) laboratory
Publisher:
Royal Society of Chemistry
Journal:
Physical Chemistry Chemical Physics
Issue Date:
2010
DOI:
10.1039/c0cp00127a
Type:
Article
ISSN:
14639076
Sponsors:
The authors thank Ministry of Education, Singapore (ARC 27/07 and 13/09) for financial support.
Appears in Collections:
Articles; Advanced Membranes and Porous Materials Research Center; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorYang, Miaoxinen
dc.contributor.authorChen, Gangen
dc.contributor.authorZhao, Yunfengen
dc.contributor.authorSilber, Georgen
dc.contributor.authorWang, Yongen
dc.contributor.authorXing, Shuangxien
dc.contributor.authorHan, Yuen
dc.contributor.authorChen, Hongyuen
dc.date.accessioned2015-08-02T09:13:39Zen
dc.date.available2015-08-02T09:13:39Zen
dc.date.issued2010en
dc.identifier.issn14639076en
dc.identifier.doi10.1039/c0cp00127aen
dc.identifier.urihttp://hdl.handle.net/10754/561534en
dc.description.abstractUnderstanding 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.en
dc.description.sponsorshipThe authors thank Ministry of Education, Singapore (ARC 27/07 and 13/09) for financial support.en
dc.publisherRoyal Society of Chemistryen
dc.titleMechanistic investigation into the spontaneous linear assembly of gold nanospheresen
dc.typeArticleen
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Centeren
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentChemical Science Programen
dc.contributor.departmentNanostructured Functional Materials (NFM) laboratoryen
dc.identifier.journalPhysical Chemistry Chemical Physicsen
dc.contributor.institutionDivision of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link 637371, 637371, Singapore, Singaporeen
kaust.authorZhao, Yunfengen
kaust.authorHan, Yuen
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