Photonic band gap and bactericide performance of amorphous sol-gel titania
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10362/146321 |
Resumo: | In addition to its traditional application in white pigments, nanocrystalline titania (TiO 2 ) has optoelectronic and photocatalytic properties (strongly dependent on crystallinity, particle size, and surface structure) that grant this naturally occurring oxide new technological applications. Sol-gel is one of the most widely used methods to synthesize TiO 2 films and NPs, but the products obtained (mostly oxy-hydrated amorphous phases) require severe heat-treatments to promote crystallization, in which control over size and shape is difficult to achieve. In this work, we obtained new photocatalytic materials based on amorphous titania and measured their electronic band gap. Two case studies are reported that show the enormous potential of amorphous titania as bactericide or photocatalyst. In the first, amorphous sol-gel TiO 2 thin films doped with N (TiO 2−x N x , x = 0.75) were designed to exhibit a photonic band gap in the visible region. The identification of Ti-O-N and N-Ti-O bindings was achieved by XPS. The photonic band gaps were found to be 3.18 eV for a-TiO 2 and 2.99 eV for N-doped a-TiO 2 . In the second study, amorphous titania and amine-functionalized amorphous titania nanoparticles were synthetized using a novel base-catalysed sol-gel methodology. All the synthesized amorphous TiO 2 nanoparticles exhibit bactericide performance (E. coli, ASTME 2149-13). |
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Photonic band gap and bactericide performance of amorphous sol-gel titaniaAn Alternative to crystalline TiO 2Amorphous-TiOBactericideE. coliFilmsNPsPhotonic band-gapSol-gelAnalytical ChemistryChemistry (miscellaneous)Molecular MedicinePharmaceutical ScienceDrug DiscoveryPhysical and Theoretical ChemistryOrganic ChemistryIn addition to its traditional application in white pigments, nanocrystalline titania (TiO 2 ) has optoelectronic and photocatalytic properties (strongly dependent on crystallinity, particle size, and surface structure) that grant this naturally occurring oxide new technological applications. Sol-gel is one of the most widely used methods to synthesize TiO 2 films and NPs, but the products obtained (mostly oxy-hydrated amorphous phases) require severe heat-treatments to promote crystallization, in which control over size and shape is difficult to achieve. In this work, we obtained new photocatalytic materials based on amorphous titania and measured their electronic band gap. Two case studies are reported that show the enormous potential of amorphous titania as bactericide or photocatalyst. In the first, amorphous sol-gel TiO 2 thin films doped with N (TiO 2−x N x , x = 0.75) were designed to exhibit a photonic band gap in the visible region. The identification of Ti-O-N and N-Ti-O bindings was achieved by XPS. The photonic band gaps were found to be 3.18 eV for a-TiO 2 and 2.99 eV for N-doped a-TiO 2 . In the second study, amorphous titania and amine-functionalized amorphous titania nanoparticles were synthetized using a novel base-catalysed sol-gel methodology. All the synthesized amorphous TiO 2 nanoparticles exhibit bactericide performance (E. coli, ASTME 2149-13).CeFITec – Centro de Física e Investigação TecnológicaRUNGonçalves, M. ClaraPereira, José CarlosMatos, Joana C.Vasconcelos, Helena Cristina2022-12-16T22:07:50Z2018-07-102018-07-10T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article20application/pdfhttp://hdl.handle.net/10362/146321engPURE: 13655719https://doi.org/10.3390/molecules23071677info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T05:27:24Zoai:run.unl.pt:10362/146321Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:52:35.405875Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Photonic band gap and bactericide performance of amorphous sol-gel titania An Alternative to crystalline TiO 2 |
title |
Photonic band gap and bactericide performance of amorphous sol-gel titania |
spellingShingle |
Photonic band gap and bactericide performance of amorphous sol-gel titania Gonçalves, M. Clara Amorphous-TiO Bactericide E. coli Films NPs Photonic band-gap Sol-gel Analytical Chemistry Chemistry (miscellaneous) Molecular Medicine Pharmaceutical Science Drug Discovery Physical and Theoretical Chemistry Organic Chemistry |
title_short |
Photonic band gap and bactericide performance of amorphous sol-gel titania |
title_full |
Photonic band gap and bactericide performance of amorphous sol-gel titania |
title_fullStr |
Photonic band gap and bactericide performance of amorphous sol-gel titania |
title_full_unstemmed |
Photonic band gap and bactericide performance of amorphous sol-gel titania |
title_sort |
Photonic band gap and bactericide performance of amorphous sol-gel titania |
author |
Gonçalves, M. Clara |
author_facet |
Gonçalves, M. Clara Pereira, José Carlos Matos, Joana C. Vasconcelos, Helena Cristina |
author_role |
author |
author2 |
Pereira, José Carlos Matos, Joana C. Vasconcelos, Helena Cristina |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
CeFITec – Centro de Física e Investigação Tecnológica RUN |
dc.contributor.author.fl_str_mv |
Gonçalves, M. Clara Pereira, José Carlos Matos, Joana C. Vasconcelos, Helena Cristina |
dc.subject.por.fl_str_mv |
Amorphous-TiO Bactericide E. coli Films NPs Photonic band-gap Sol-gel Analytical Chemistry Chemistry (miscellaneous) Molecular Medicine Pharmaceutical Science Drug Discovery Physical and Theoretical Chemistry Organic Chemistry |
topic |
Amorphous-TiO Bactericide E. coli Films NPs Photonic band-gap Sol-gel Analytical Chemistry Chemistry (miscellaneous) Molecular Medicine Pharmaceutical Science Drug Discovery Physical and Theoretical Chemistry Organic Chemistry |
description |
In addition to its traditional application in white pigments, nanocrystalline titania (TiO 2 ) has optoelectronic and photocatalytic properties (strongly dependent on crystallinity, particle size, and surface structure) that grant this naturally occurring oxide new technological applications. Sol-gel is one of the most widely used methods to synthesize TiO 2 films and NPs, but the products obtained (mostly oxy-hydrated amorphous phases) require severe heat-treatments to promote crystallization, in which control over size and shape is difficult to achieve. In this work, we obtained new photocatalytic materials based on amorphous titania and measured their electronic band gap. Two case studies are reported that show the enormous potential of amorphous titania as bactericide or photocatalyst. In the first, amorphous sol-gel TiO 2 thin films doped with N (TiO 2−x N x , x = 0.75) were designed to exhibit a photonic band gap in the visible region. The identification of Ti-O-N and N-Ti-O bindings was achieved by XPS. The photonic band gaps were found to be 3.18 eV for a-TiO 2 and 2.99 eV for N-doped a-TiO 2 . In the second study, amorphous titania and amine-functionalized amorphous titania nanoparticles were synthetized using a novel base-catalysed sol-gel methodology. All the synthesized amorphous TiO 2 nanoparticles exhibit bactericide performance (E. coli, ASTME 2149-13). |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-07-10 2018-07-10T00:00:00Z 2022-12-16T22:07:50Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10362/146321 |
url |
http://hdl.handle.net/10362/146321 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
PURE: 13655719 https://doi.org/10.3390/molecules23071677 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
20 application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799138116729044992 |