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Conference Paper: ZnO nanostructures prepared by different methods

TitleZnO nanostructures prepared by different methods
Authors
Issue Date2004
PublisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/epubs/proceedings/spring2004/index.html
Citation
Materials Research Society Symposium Proceedings, 2004, v. 818, p. 203-208 How to Cite?
AbstractZnO is of great interest for photonic applications due to its wide band gap (3.37 eV) and large exciton binding energy (60 meV). Variety of preparation methods and obtained morphologies (such as nanorods, tetrapod nanorods, nanowires, nanoribbons, hierarchical structures, nanobridges, and nanonails) were reported for this material. In this work, the morphology and optical properties of ZnO nanostructures prepared by three different methods were studied. ZnO nanostructures were prepared by oxidation of Zn (no catalyst) at 950°C, heating of a mixture of ZnO:graphite (1:1) at 1100°C, and chemical method (from solution of zinc nitrate hydrate and hexamethylenetetramine at 90°C). The properties of obtained products were examined using scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, X-ray diffraction, room temperature photoluminescence and electron paramagnetic resonance spectroscopy. Chemical synthesis method produced different morphology compared to heating of Zn and ZnO:graphite. In the former case, straight rods are obtained, while in the latter case ZnO tetrapod structures are formed. The ZnO tetrapods, both from Zn and ZnO:graphite, exhibit similar photoluminescence spectra with UV peak and characteristic broad green emission but they have different EPR spectra. The EPR signal g≈1.96 is clearly visible in ZnO tetrapods synthesized from ZnO:graphite, while it is at noise level in ZnO tetrapods synthesized from Zn. Therefore, it can be concluded that the type of intrinsic defects in ZnO nanostructures is strongly dependent on the fabrication conditions, and that the green photoluminescence is not necessarily related to g≈1.96 EPR peak which is commonly assigned to shallow donors.
Persistent Identifierhttp://hdl.handle.net/10722/97071
ISSN
References

 

DC FieldValueLanguage
dc.contributor.authorLeung, YHen_HK
dc.contributor.authorDiurišić, ABen_HK
dc.contributor.authorChoy, WCHen_HK
dc.contributor.authorChan, WKen_HK
dc.contributor.authorCheah, KWen_HK
dc.date.accessioned2010-09-25T16:55:23Z-
dc.date.available2010-09-25T16:55:23Z-
dc.date.issued2004en_HK
dc.identifier.citationMaterials Research Society Symposium Proceedings, 2004, v. 818, p. 203-208en_HK
dc.identifier.issn0272-9172en_HK
dc.identifier.urihttp://hdl.handle.net/10722/97071-
dc.description.abstractZnO is of great interest for photonic applications due to its wide band gap (3.37 eV) and large exciton binding energy (60 meV). Variety of preparation methods and obtained morphologies (such as nanorods, tetrapod nanorods, nanowires, nanoribbons, hierarchical structures, nanobridges, and nanonails) were reported for this material. In this work, the morphology and optical properties of ZnO nanostructures prepared by three different methods were studied. ZnO nanostructures were prepared by oxidation of Zn (no catalyst) at 950°C, heating of a mixture of ZnO:graphite (1:1) at 1100°C, and chemical method (from solution of zinc nitrate hydrate and hexamethylenetetramine at 90°C). The properties of obtained products were examined using scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, X-ray diffraction, room temperature photoluminescence and electron paramagnetic resonance spectroscopy. Chemical synthesis method produced different morphology compared to heating of Zn and ZnO:graphite. In the former case, straight rods are obtained, while in the latter case ZnO tetrapod structures are formed. The ZnO tetrapods, both from Zn and ZnO:graphite, exhibit similar photoluminescence spectra with UV peak and characteristic broad green emission but they have different EPR spectra. The EPR signal g≈1.96 is clearly visible in ZnO tetrapods synthesized from ZnO:graphite, while it is at noise level in ZnO tetrapods synthesized from Zn. Therefore, it can be concluded that the type of intrinsic defects in ZnO nanostructures is strongly dependent on the fabrication conditions, and that the green photoluminescence is not necessarily related to g≈1.96 EPR peak which is commonly assigned to shallow donors.en_HK
dc.languageengen_HK
dc.publisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/epubs/proceedings/spring2004/index.htmlen_HK
dc.relation.ispartofMaterials Research Society Symposium Proceedingsen_HK
dc.titleZnO nanostructures prepared by different methodsen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailChoy, WCH:chchoy@eee.hku.hken_HK
dc.identifier.emailChan, WK:waichan@hku.hken_HK
dc.identifier.authorityChoy, WCH=rp00218en_HK
dc.identifier.authorityChan, WK=rp00667en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-12744277358en_HK
dc.identifier.hkuros131809en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-12744277358&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume818en_HK
dc.identifier.spage203en_HK
dc.identifier.epage208en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLeung, YH=7201463866en_HK
dc.identifier.scopusauthoridDiurišić, AB=16635506800en_HK
dc.identifier.scopusauthoridChoy, WCH=7006202371en_HK
dc.identifier.scopusauthoridChan, WK=13310083000en_HK
dc.identifier.scopusauthoridCheah, KW=7102792922en_HK

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