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Conference Paper: A comparison study on hydrogen sensing performance of Pt/MoO3 nanoplatelets coated with a thin layer of Ta2O5 or La2O3

TitleA comparison study on hydrogen sensing performance of Pt/MoO3 nanoplatelets coated with a thin layer of Ta2O5 or La2O3
Authors
KeywordsHeterostructure
Hydrogen
Metal oxide
Sensor
Issue Date2013
PublisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/conhome.jsp?punumber=1001116
Citation
The 8th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systems (IEEE NEMS 2013), Suzhou; China, 7-10 April 2013. In Conference Proceedings, 2013, p. 191-194 How to Cite?
AbstractIn this work, we investigate how hydrogen sensing performance of thermally evaporated MoO3 nanoplatelets can be further improved by RF sputtering a thin layer of tantalum oxide (Ta2O5) or lanthanum oxide (La2O3). We show that dissociated hydrogen atoms cause the thin film layer to be polarised, inducing a measurable potential difference greater than that as reported previously. We attribute these observations to the presence of numerous traps in the thin layer; their states allow a stronger trapping of charge at the Pt-thin film oxide interface as compared to the MoO3 sensors without the coating. Under exposure to H2 (10 000 ppm), the maximum change in dielectric constant is 45.6 (at 260 °C) for the Ta2O5/MoO3 nanoplatelets and 31.6 (at 220 °C) for the La2O 3/MoO3 nanoplatelets. Subsequently, the maximum sensitivity for the Ta2O5/MoO3 and La 2O3/MoO3 based sensors is 16.8 and 7.5, respectively. © 2013 IEEE.
Persistent Identifierhttp://hdl.handle.net/10722/191659
ISBN

 

DC FieldValueLanguage
dc.contributor.authorYu, Jen_US
dc.contributor.authorLiu, Yen_US
dc.contributor.authorCai, FXen_US
dc.contributor.authorShafiei, Men_US
dc.contributor.authorChen, Gen_US
dc.contributor.authorMotta, Nen_US
dc.contributor.authorWlodarski, Wen_US
dc.contributor.authorKalantar-zadeh, Ken_US
dc.contributor.authorLai, PT-
dc.date.accessioned2013-10-15T07:14:57Z-
dc.date.available2013-10-15T07:14:57Z-
dc.date.issued2013en_US
dc.identifier.citationThe 8th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systems (IEEE NEMS 2013), Suzhou; China, 7-10 April 2013. In Conference Proceedings, 2013, p. 191-194en_US
dc.identifier.isbn978-1-4673-6352-5-
dc.identifier.urihttp://hdl.handle.net/10722/191659-
dc.description.abstractIn this work, we investigate how hydrogen sensing performance of thermally evaporated MoO3 nanoplatelets can be further improved by RF sputtering a thin layer of tantalum oxide (Ta2O5) or lanthanum oxide (La2O3). We show that dissociated hydrogen atoms cause the thin film layer to be polarised, inducing a measurable potential difference greater than that as reported previously. We attribute these observations to the presence of numerous traps in the thin layer; their states allow a stronger trapping of charge at the Pt-thin film oxide interface as compared to the MoO3 sensors without the coating. Under exposure to H2 (10 000 ppm), the maximum change in dielectric constant is 45.6 (at 260 °C) for the Ta2O5/MoO3 nanoplatelets and 31.6 (at 220 °C) for the La2O 3/MoO3 nanoplatelets. Subsequently, the maximum sensitivity for the Ta2O5/MoO3 and La 2O3/MoO3 based sensors is 16.8 and 7.5, respectively. © 2013 IEEE.-
dc.languageengen_US
dc.publisherIEEE. The Journal's web site is located at http://ieeexplore.ieee.org/xpl/conhome.jsp?punumber=1001116-
dc.relation.ispartofIEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) Proceedingsen_US
dc.rightsIEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) Proceedings. Copyright © IEEE.-
dc.rights©2013 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectHeterostructure-
dc.subjectHydrogen-
dc.subjectMetal oxide-
dc.subjectSensor-
dc.titleA comparison study on hydrogen sensing performance of Pt/MoO3 nanoplatelets coated with a thin layer of Ta2O5 or La2O3en_US
dc.typeConference_Paperen_US
dc.identifier.emailYu, J: jcwyu@hku.hken_US
dc.identifier.emailLai, PT: laip@eee.hku.hk-
dc.identifier.authorityLai, PT=rp00130en_US
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1109/NEMS.2013.6559712-
dc.identifier.scopuseid_2-s2.0-84883116156-
dc.identifier.hkuros226050en_US
dc.identifier.hkuros226592-
dc.identifier.spage191-
dc.identifier.epage194-
dc.publisher.placeUnited Statesen_US
dc.customcontrol.immutablesml 131107-

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