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Toward monodispersed silver nanoparticles with unusual thermal stability
Sun, Junming; Ma, Ding; Zhang, He; Liu, Xiumei; Han, Xiuwen; Bao, Xinhe; Weinberg, Gisela; Pfaender, Norbert; Su, Dangsheng
Source PublicationJOURNAL OF THE AMERICAN CHEMICAL SOCIETY
2006-12-13
DOI10.1021/ja064884j
Volume128Issue:49Pages:15756-15764
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Multidisciplinary
WOS Research AreaChemistry
WOS KeywordORDERED MESOPOROUS MATERIALS ; IN-SITU FORMATION ; MOLECULAR-SIEVES ; CO OXIDATION ; SILICA FILMS ; CATALYSTS ; SBA-15 ; GOLD ; TEMPERATURE ; MECHANISM
AbstractA novel in situ autoreduction route has been developed, by which monodispersed silver nanoparticles with tunable sizes could be easily fabricated on silica-based materials, especially inside the channels of mesoporous silica (MPS). C-13 CP/MAS NMR spectroscopy was employed to monitor the whole assembly process. It was demonstrated that the amino groups of APTS (aminopropyltriethoxyl silane)modified MPS can be used to anchor formaldehyde to form novel reducing species (NHCH2OH), on which Ag(NH3)(2)NO3 could be in situ reduced. Monodispersed silver nanoparticles were thus obtained. In situ XRD and in situ TEM experiments were used to investigate and compare the thermal stabilities of silver nanoparticles on the external surface of silica gels (unconfined) and those located inside the channels of SBA-15 (confined). It was observed that unconfined silver nanoparticles tended to agglomerate at low temperatures (i.e., lower than 773 K). The aggregation of silver nanoparticles became more serious at 773 K. However, for those confined silver nanoparticles, no coarsening process was observed at 773 K, much higher than its Tammann temperature (i.e., 617 K). Only when the treating temperature was higher than 873 K could the agglomeration of those confined silver nanoparticles happen with time-varying via the Ostwald ripening process. The confinement of mesopores played a key role in improving the thermal stabilities of silver nanoparticles (stable up to 773 K without any observable coarsening), which is essential to the further investigations on their chemical (e.g., catalytic) properties.
Language英语
WOS IDWOS:000242575300047
Citation statistics
Cited Times:199[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/140079
Collection中国科学院大连化学物理研究所
Affiliation1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Max Planck Soc, Fritz Haber Inst, Dept Inorgan Chem, D-14195 Berlin, Germany
Recommended Citation
GB/T 7714
Sun, Junming,Ma, Ding,Zhang, He,et al. Toward monodispersed silver nanoparticles with unusual thermal stability[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2006,128(49):15756-15764.
APA Sun, Junming.,Ma, Ding.,Zhang, He.,Liu, Xiumei.,Han, Xiuwen.,...&Su, Dangsheng.(2006).Toward monodispersed silver nanoparticles with unusual thermal stability.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,128(49),15756-15764.
MLA Sun, Junming,et al."Toward monodispersed silver nanoparticles with unusual thermal stability".JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 128.49(2006):15756-15764.
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