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Polyoxometalate-Assisted Galvanic Replacement Synthesis of Silver Hierarchical Dendritic Structures
Alternative TitleCryst. Growth Des.
Liu, Rongji1,4; Li, Shiwen1; Yu, Xuelian1; Zhang, Guangjin1; Ma, Ying2; Yao, Jiannian2; Keita, Bineta3; Nadjo, Louis3
2011-08-01
Source PublicationCRYSTAL GROWTH & DESIGN
ISSN1528-7483
Volume11Issue:8Pages:3424-3431
AbstractA simple organic-free replacement process was realized between an aqueous silver nitrate solution and an aluminum wafer, in the presence of a polyoxometalate (POM), [PW12O40](3-) (PW12). The same protocol was used with a carbon-coated copper grid and a silicon wafer. The POM was photochemically reduced and used as both a reductant and a stabilizer of silver nanoparticles, Ag@POM, in the homogeneous phase. The presence of the POM and Ag@POM colloids was found to modulate the reaction kinetics, and the POM serves as a kind of soft template, maintaining the anisotropic conditions and directing the Ag nanoparticles in the solution to the seeds. Multiple morphologies were obtained, including nanoplates decorated at their periphery with fractal structures, dendrites, and nanospheres. The objects were studied by FESEM, TEM, XRD, XPS, and EDX. Through the variation of the silver salt to POM ratio and the initial concentrations of reactants, in addition to time-dependent observations, it has been possible to distinguish a kinetically dominated route resulting in nanoplates and the nonequilibrium and anisotropic growth yielding fractal and dendritic structures. Altogether, these observations have suggested a global growth mechanism. SERS study of Rhodhamine B on the dendrites gives particularly sharp results.; A simple organic-free replacement process was realized between an aqueous silver nitrate solution and an aluminum wafer, in the presence of a polyoxometalate (POM), [PW12O40](3-) (PW12). The same protocol was used with a carbon-coated copper grid and a silicon wafer. The POM was photochemically reduced and used as both a reductant and a stabilizer of silver nanoparticles, Ag@POM, in the homogeneous phase. The presence of the POM and Ag@POM colloids was found to modulate the reaction kinetics, and the POM serves as a kind of soft template, maintaining the anisotropic conditions and directing the Ag nanoparticles in the solution to the seeds. Multiple morphologies were obtained, including nanoplates decorated at their periphery with fractal structures, dendrites, and nanospheres. The objects were studied by FESEM, TEM, XRD, XPS, and EDX. Through the variation of the silver salt to POM ratio and the initial concentrations of reactants, in addition to time-dependent observations, it has been possible to distinguish a kinetically dominated route resulting in nanoplates and the nonequilibrium and anisotropic growth yielding fractal and dendritic structures. Altogether, these observations have suggested a global growth mechanism. SERS study of Rhodhamine B on the dendrites gives particularly sharp results.
KeywordEnhanced Raman-scattering Facile Synthesis Sers Substrate Porous Silicon Nanostructures Nanoparticles Surface Growth Nanodendrites Nanocrystals
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1021/cg2001333
URL查看原文
Indexed BySCI
Language英语
WOS KeywordENHANCED RAMAN-SCATTERING ; FACILE SYNTHESIS ; SERS SUBSTRATE ; POROUS SILICON ; NANOSTRUCTURES ; NANOPARTICLES ; SURFACE ; GROWTH ; NANODENDRITES ; NANOCRYSTALS
WOS Research AreaChemistry ; Crystallography ; Materials Science
WOS SubjectChemistry, Multidisciplinary ; Crystallography ; Materials Science, Multidisciplinary
WOS IDWOS:000293356400016
Citation statistics
Cited Times:24[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/6435
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Key Lab Photochem, Inst Chem, Beijing 100190, Peoples R China
3.Univ Paris 11, Chim Phys Lab, Equipe Electrochim & Photoelectrochim, UMR CNRS 8000, F-91405 Orsay, France
4.Chinese Acad Sci, Grad Univ, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Liu, Rongji,Li, Shiwen,Yu, Xuelian,et al. Polyoxometalate-Assisted Galvanic Replacement Synthesis of Silver Hierarchical Dendritic Structures[J]. CRYSTAL GROWTH & DESIGN,2011,11(8):3424-3431.
APA Liu, Rongji.,Li, Shiwen.,Yu, Xuelian.,Zhang, Guangjin.,Ma, Ying.,...&Nadjo, Louis.(2011).Polyoxometalate-Assisted Galvanic Replacement Synthesis of Silver Hierarchical Dendritic Structures.CRYSTAL GROWTH & DESIGN,11(8),3424-3431.
MLA Liu, Rongji,et al."Polyoxometalate-Assisted Galvanic Replacement Synthesis of Silver Hierarchical Dendritic Structures".CRYSTAL GROWTH & DESIGN 11.8(2011):3424-3431.
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