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Article: Hydrothermal synthesis of platinum-group-metal nanoparticles by using HEPES as a reductant and stabilizer

TitleHydrothermal synthesis of platinum-group-metal nanoparticles by using HEPES as a reductant and stabilizer
Authors
KeywordsHEPES buffer
Hydrothermal synthesis
Nanoparticles
Platinum-group metals
Supported catalysts
Issue Date2010
PublisherWiley - V C H Verlag GmbH & Co. KGaA. The Journal's web site is located at http://www.wiley-vch.de/publish/en/journals/alphabeticIndex/2451
Citation
Chemistry - An Asian Journal, 2010, v. 5 n. 6, p. 1322-1331 How to Cite?
AbstractPlatinum-group-metal (Ru, Os, Rh, Ir, Pd and Pt) nanoparticles are synthesized in an aqueous buffer solution of 4-(2-hydroxyethyl)-1-piper- azineethanesulfonic acid (HEPES) (200 mM, pH 7.4) under hydrothermal conditions (180 °C). Monodispersed (monodispersity: 11-15%) metal nanoparticles were obtained with an average particle size of less than 5 nm (Ru: 1.8±0.2, Os: 1.6±0.2, Rh: 4.5 ±0.5, Ir: 2.0±0.3, Pd: 3.8±0.4, Pt: 1.9±0.2 nm). The size, monodispersity, and stability of the as-obtained metal nanoparticles were affected by the HEPES concentration, pH of the HEPES buffer solution, and reaction temperature. HEPES with two tertiary amines (pi- perazine groups) and terminal hydroxyl groups can act as a reductant and stabilizer. The HEPES molecules can bind to the surface of metal nanoparticles to prevent metal nanoparticles from aggregation. These platinum- group-metal nanoparticles could be deposited onto the surface of graphite, which catalyzed the aerobic oxidation of alcohols to aldehydes. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Persistent Identifierhttp://hdl.handle.net/10722/134714
ISSN
2015 Impact Factor: 4.592
2015 SCImago Journal Rankings: 1.833
ISI Accession Number ID
Funding AgencyGrant Number
Innovation and Technology FundITS/189/08
University Development Fund
Hong Kong Research Grants CouncilHKU 1/CRF/08
CityU 2/06C
Funding Information:

This work was supported by the Innovation and Technology Fund (ITS/189/08), University Development Fund, and the Hong Kong Research Grants Council (HKU 1/CRF/08 and CityU 2/06C). We thank Dr. Y. Liu for his helpful discussions and translation of the abstract from English to the traditional Chinese language. We offer our heartfelt thanks to F. Yu-Fee Chan and W.-S. Lee of the Electron Microscope Unit of the University of Hong Kong for their technical assistance.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorSo, MHen_HK
dc.contributor.authorHo, CMen_HK
dc.contributor.authorChen, Ren_HK
dc.contributor.authorChe, CMen_HK
dc.date.accessioned2011-07-08T06:46:32Z-
dc.date.available2011-07-08T06:46:32Z-
dc.date.issued2010en_HK
dc.identifier.citationChemistry - An Asian Journal, 2010, v. 5 n. 6, p. 1322-1331en_HK
dc.identifier.issn1861-4728en_HK
dc.identifier.urihttp://hdl.handle.net/10722/134714-
dc.description.abstractPlatinum-group-metal (Ru, Os, Rh, Ir, Pd and Pt) nanoparticles are synthesized in an aqueous buffer solution of 4-(2-hydroxyethyl)-1-piper- azineethanesulfonic acid (HEPES) (200 mM, pH 7.4) under hydrothermal conditions (180 °C). Monodispersed (monodispersity: 11-15%) metal nanoparticles were obtained with an average particle size of less than 5 nm (Ru: 1.8±0.2, Os: 1.6±0.2, Rh: 4.5 ±0.5, Ir: 2.0±0.3, Pd: 3.8±0.4, Pt: 1.9±0.2 nm). The size, monodispersity, and stability of the as-obtained metal nanoparticles were affected by the HEPES concentration, pH of the HEPES buffer solution, and reaction temperature. HEPES with two tertiary amines (pi- perazine groups) and terminal hydroxyl groups can act as a reductant and stabilizer. The HEPES molecules can bind to the surface of metal nanoparticles to prevent metal nanoparticles from aggregation. These platinum- group-metal nanoparticles could be deposited onto the surface of graphite, which catalyzed the aerobic oxidation of alcohols to aldehydes. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.en_HK
dc.languageeng-
dc.publisherWiley - V C H Verlag GmbH & Co. KGaA. The Journal's web site is located at http://www.wiley-vch.de/publish/en/journals/alphabeticIndex/2451en_HK
dc.relation.ispartofChemistry - An Asian Journalen_HK
dc.subjectHEPES bufferen_HK
dc.subjectHydrothermal synthesisen_HK
dc.subjectNanoparticlesen_HK
dc.subjectPlatinum-group metalsen_HK
dc.subjectSupported catalystsen_HK
dc.subject.meshCatalysis-
dc.subject.meshHEPES - chemistry-
dc.subject.meshMetal Nanoparticles - chemistry-
dc.subject.meshMetals, Heavy - chemical synthesis - chemistry-
dc.subject.meshPlatinum - chemistry-
dc.titleHydrothermal synthesis of platinum-group-metal nanoparticles by using HEPES as a reductant and stabilizeren_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1861-4728&volume=5&issue=6&spage=1322&epage=1331&date=2010&atitle=Hydrothermal+synthesis+of+platinum-group-metal+nanoparticles+by+using+HEPES+as+a+reductant+and+stabilizer-
dc.identifier.emailHo, CM: rickyho@hkucc.hku.hken_HK
dc.identifier.emailChe, CM: cmche@hku.hken_HK
dc.identifier.authorityHo, CM=rp00705en_HK
dc.identifier.authorityChe, CM=rp00670en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/asia.201000066en_HK
dc.identifier.pmid20512785-
dc.identifier.scopuseid_2-s2.0-77952914719en_HK
dc.identifier.hkuros173059-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77952914719&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume5en_HK
dc.identifier.issue6en_HK
dc.identifier.spage1322en_HK
dc.identifier.epage1331en_HK
dc.identifier.isiWOS:000278840200010-
dc.publisher.placeGermanyen_HK
dc.relation.projectGreen Oxidation Chemistry and Technology-
dc.relation.projectGreen Chemistry. Application of Nanotechnology in the Development of Highly Efficient and Environmental Friendly Chemical Synthesis.-
dc.identifier.scopusauthoridSo, MH=9275915300en_HK
dc.identifier.scopusauthoridHo, CM=12807243800en_HK
dc.identifier.scopusauthoridChen, R=9275915200en_HK
dc.identifier.scopusauthoridChe, CM=7102442791en_HK

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