File Download
  Links for fulltext
     (May Require Subscription)
Supplementary

Conference Paper: Strategy for introducing antibacterial activity under ambient illumination in titania nanoparticles

TitleStrategy for introducing antibacterial activity under ambient illumination in titania nanoparticles
Authors
KeywordsAntibacterial activity
E. coli
TiO2
Issue Date2015
PublisherSPIE - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xml?WT.svl=mddp2
Citation
Oxide-Based Materials and Devices VI; San Francisco, CA., 8-11 February 2015. In SPIE - International Society for Optical Engineering Proceedings, 2015, v. 9364, p. 93641A-1 - 93641A-6 How to Cite?
AbstractTitanium dioxide (TiO2) is a wide bandgap (∼3.4 eV) semiconductor material which is commonly used as a photocatalyst and antibacterial material. UV illumination with energy similar to the bandgap is often needed to make the material active. It would be favorable for practical applications, if its action can also be activated under ambient. Recently, robust antibacterial action was demonstrated on ZnO nanoparticles under ambient illumination. In this study, we demonstrated robust antibacterial activity of TiO2 nanoparticles induced by annealing under ambient illumination. It was found that the antibacterial activity could be significantly changed by tuning the annealing temperatures and using different crucibles containing the nanoparticles. Bacterium Escherichia coli was used as the model organism in the test. It was observed that although no significant antibacterial activity was observed on the starting material (untreated commercial TiO2 nanoparticles), the activity increases significantly if the nanoparticles were annealed above 650 °C with crucible lined with copper foil. The survival rate of E. coli bacteria approaches to zero if the nanoparticles annealing temperature reaches 850 °C. Under optimized conditions, three different titania nanoparticle samples exhibited antibacterial activity under ambient illumination. This work sheds light on the development of ambient-active antibacterial coating and in particular, on the modification of any TiO2 material to become ambient-active with a suitable treatment. © 2015 SPIE.
Persistent Identifierhttp://hdl.handle.net/10722/217706
ISBN
ISSN

 

DC FieldValueLanguage
dc.contributor.authorHsu, A-
dc.contributor.authorLiu, F-
dc.contributor.authorLeung, YH-
dc.contributor.authorMa, APY-
dc.contributor.authorDjurisic, AB-
dc.contributor.authorLeung, FCC-
dc.date.accessioned2015-09-18T06:10:52Z-
dc.date.available2015-09-18T06:10:52Z-
dc.date.issued2015-
dc.identifier.citationOxide-Based Materials and Devices VI; San Francisco, CA., 8-11 February 2015. In SPIE - International Society for Optical Engineering Proceedings, 2015, v. 9364, p. 93641A-1 - 93641A-6-
dc.identifier.isbn978-162841454-7-
dc.identifier.issn0277-786X-
dc.identifier.urihttp://hdl.handle.net/10722/217706-
dc.description.abstractTitanium dioxide (TiO2) is a wide bandgap (∼3.4 eV) semiconductor material which is commonly used as a photocatalyst and antibacterial material. UV illumination with energy similar to the bandgap is often needed to make the material active. It would be favorable for practical applications, if its action can also be activated under ambient. Recently, robust antibacterial action was demonstrated on ZnO nanoparticles under ambient illumination. In this study, we demonstrated robust antibacterial activity of TiO2 nanoparticles induced by annealing under ambient illumination. It was found that the antibacterial activity could be significantly changed by tuning the annealing temperatures and using different crucibles containing the nanoparticles. Bacterium Escherichia coli was used as the model organism in the test. It was observed that although no significant antibacterial activity was observed on the starting material (untreated commercial TiO2 nanoparticles), the activity increases significantly if the nanoparticles were annealed above 650 °C with crucible lined with copper foil. The survival rate of E. coli bacteria approaches to zero if the nanoparticles annealing temperature reaches 850 °C. Under optimized conditions, three different titania nanoparticle samples exhibited antibacterial activity under ambient illumination. This work sheds light on the development of ambient-active antibacterial coating and in particular, on the modification of any TiO2 material to become ambient-active with a suitable treatment. © 2015 SPIE.-
dc.languageeng-
dc.publisherSPIE - International Society for Optical Engineering. The Journal's web site is located at http://spie.org/x1848.xml?WT.svl=mddp2-
dc.relation.ispartofSPIE - International Society for Optical Engineering Proceedings-
dc.rightsSPIE - International Society for Optical Engineering Proceedings. Copyright © SPIE - International Society for Optical Engineering.-
dc.rightsCopyright notice format: Copyright 2015 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectAntibacterial activity-
dc.subjectE. coli-
dc.subjectTiO2-
dc.titleStrategy for introducing antibacterial activity under ambient illumination in titania nanoparticles-
dc.typeConference_Paper-
dc.identifier.emailMa, APY: apyma@hku.hk-
dc.identifier.emailDjurisic, AB: dalek@hku.hk-
dc.identifier.emailLeung, FCC: fcleung@hkucc.hku.hk-
dc.identifier.authorityLeung, YH=rp01770-
dc.identifier.authorityDjurisic, AB=rp00690-
dc.identifier.authorityLeung, FCC=rp00731-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1117/12.2078568-
dc.identifier.scopuseid_2-s2.0-84931864600-
dc.identifier.hkuros255077-
dc.identifier.volume9364-
dc.identifier.spage93641A-1-
dc.identifier.epage93641A-6-
dc.publisher.placeUnited States-
dc.customcontrol.immutablesml 151123-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats