Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid
- Autores
- Ullah, Sajjad; Sáez Acuña, José Javier; Pasa, André Avelino; Bilmes, Sara Aldabe; Vela, María Elena; Benitez, Guillermo Alfredo; Rodrigues Filho, Ubirajara Pereira
- Año de publicación
- 2013
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- A versatile layer-by-layer (LbL) procedure for the preparation of highly dispersed, adherent and porous multilayer films of TiO2 nanoparticles (NPs) and phosphotungstic acid (HPW) on a variety of substrates at room temperature was developed based on the use of cellulose phosphate (CP) as an efficient and non-conventional polyelectrolyte. UV/vis absorption spectroscopy confirmed the linear and regular growth of the films with the number of immersion cycles and a strong adsorption ability of CP towards TiO2 NPs. FTIR spectroscopy showed that HPW binds to the surface of TiO2 through the oxygen atom at the corner of the Keggin structure. XPS results showed that the interaction between TiO2 and CP is through Ti-O-P linkage. A model is proposed for the TiO2-HPW interaction based on XPS and FTIR results. FEG/SEM study of the surface morphology revealed a porous film structure with a homogenous distribution of the TiO2 NPs induced by CP. HRTEM studies showed that the resulting composite films consist of crystalline anatase and rutile phases and poly-nano-crystalline HPW with a semi-crystalline TiO2-HPW interface. These CP/TiO2 and CP/TiO2/HPW LbL films showed good photoactivity against both saturated and unsaturated species, for instance, stearic acid (SA), crystal violet (CV) and methylene blue (MB) under UV irradiation. The CP/HPW films formed on bacterial cellulose (BC) showed good photochromic response which is enhanced in presence of TiO2 due to an interfacial electron transfer from Ti2 to HPW. This simple and environmentally safe method can be used to form coatings on a variety of surfaces with photoactive TiO2 and TiO2/HPW films.
Facultad de Ciencias Exactas
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas - Materia
-
Ciencias Exactas
Cellulose phosphate
Layer-by-Layer
Photocatalysis
Photochromism
Titania Phosphotungstic acid - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/85563
Ver los metadatos del registro completo
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Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acidUllah, SajjadSáez Acuña, José JavierPasa, André AvelinoBilmes, Sara AldabeVela, María ElenaBenitez, Guillermo AlfredoRodrigues Filho, Ubirajara PereiraCiencias ExactasCellulose phosphateLayer-by-LayerPhotocatalysisPhotochromismTitania Phosphotungstic acidA versatile layer-by-layer (LbL) procedure for the preparation of highly dispersed, adherent and porous multilayer films of TiO<SUB>2</SUB> nanoparticles (NPs) and phosphotungstic acid (HPW) on a variety of substrates at room temperature was developed based on the use of cellulose phosphate (CP) as an efficient and non-conventional polyelectrolyte. UV/vis absorption spectroscopy confirmed the linear and regular growth of the films with the number of immersion cycles and a strong adsorption ability of CP towards TiO<SUB>2</SUB> NPs. FTIR spectroscopy showed that HPW binds to the surface of TiO<SUB>2</SUB> through the oxygen atom at the corner of the Keggin structure. XPS results showed that the interaction between TiO<SUB>2</SUB> and CP is through Ti-O-P linkage. A model is proposed for the TiO<SUB>2</SUB>-HPW interaction based on XPS and FTIR results. FEG/SEM study of the surface morphology revealed a porous film structure with a homogenous distribution of the TiO<SUB>2</SUB> NPs induced by CP. HRTEM studies showed that the resulting composite films consist of crystalline anatase and rutile phases and poly-nano-crystalline HPW with a semi-crystalline TiO<SUB>2</SUB>-HPW interface. These CP/TiO<SUB>2</SUB> and CP/TiO<SUB>2</SUB>/HPW LbL films showed good photoactivity against both saturated and unsaturated species, for instance, stearic acid (SA), crystal violet (CV) and methylene blue (MB) under UV irradiation. The CP/HPW films formed on bacterial cellulose (BC) showed good photochromic response which is enhanced in presence of TiO<SUB>2</SUB> due to an interfacial electron transfer from Ti<SUB>2</SUB> to HPW. This simple and environmentally safe method can be used to form coatings on a variety of surfaces with photoactive TiO<SUB>2</SUB> and TiO<SUB>2</SUB>/HPW films.Facultad de Ciencias ExactasInstituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas2013info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf111-120http://sedici.unlp.edu.ar/handle/10915/85563enginfo:eu-repo/semantics/altIdentifier/issn/0169-4332info:eu-repo/semantics/altIdentifier/doi/10.1016/j.apsusc.2013.04.011info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-03T10:48:46Zoai:sedici.unlp.edu.ar:10915/85563Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-03 10:48:47.062SEDICI (UNLP) - Universidad Nacional de La Platafalse |
| dc.title.none.fl_str_mv |
Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid |
| title |
Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid |
| spellingShingle |
Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid Ullah, Sajjad Ciencias Exactas Cellulose phosphate Layer-by-Layer Photocatalysis Photochromism Titania Phosphotungstic acid |
| title_short |
Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid |
| title_full |
Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid |
| title_fullStr |
Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid |
| title_full_unstemmed |
Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid |
| title_sort |
Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid |
| dc.creator.none.fl_str_mv |
Ullah, Sajjad Sáez Acuña, José Javier Pasa, André Avelino Bilmes, Sara Aldabe Vela, María Elena Benitez, Guillermo Alfredo Rodrigues Filho, Ubirajara Pereira |
| author |
Ullah, Sajjad |
| author_facet |
Ullah, Sajjad Sáez Acuña, José Javier Pasa, André Avelino Bilmes, Sara Aldabe Vela, María Elena Benitez, Guillermo Alfredo Rodrigues Filho, Ubirajara Pereira |
| author_role |
author |
| author2 |
Sáez Acuña, José Javier Pasa, André Avelino Bilmes, Sara Aldabe Vela, María Elena Benitez, Guillermo Alfredo Rodrigues Filho, Ubirajara Pereira |
| author2_role |
author author author author author author |
| dc.subject.none.fl_str_mv |
Ciencias Exactas Cellulose phosphate Layer-by-Layer Photocatalysis Photochromism Titania Phosphotungstic acid |
| topic |
Ciencias Exactas Cellulose phosphate Layer-by-Layer Photocatalysis Photochromism Titania Phosphotungstic acid |
| dc.description.none.fl_txt_mv |
A versatile layer-by-layer (LbL) procedure for the preparation of highly dispersed, adherent and porous multilayer films of TiO<SUB>2</SUB> nanoparticles (NPs) and phosphotungstic acid (HPW) on a variety of substrates at room temperature was developed based on the use of cellulose phosphate (CP) as an efficient and non-conventional polyelectrolyte. UV/vis absorption spectroscopy confirmed the linear and regular growth of the films with the number of immersion cycles and a strong adsorption ability of CP towards TiO<SUB>2</SUB> NPs. FTIR spectroscopy showed that HPW binds to the surface of TiO<SUB>2</SUB> through the oxygen atom at the corner of the Keggin structure. XPS results showed that the interaction between TiO<SUB>2</SUB> and CP is through Ti-O-P linkage. A model is proposed for the TiO<SUB>2</SUB>-HPW interaction based on XPS and FTIR results. FEG/SEM study of the surface morphology revealed a porous film structure with a homogenous distribution of the TiO<SUB>2</SUB> NPs induced by CP. HRTEM studies showed that the resulting composite films consist of crystalline anatase and rutile phases and poly-nano-crystalline HPW with a semi-crystalline TiO<SUB>2</SUB>-HPW interface. These CP/TiO<SUB>2</SUB> and CP/TiO<SUB>2</SUB>/HPW LbL films showed good photoactivity against both saturated and unsaturated species, for instance, stearic acid (SA), crystal violet (CV) and methylene blue (MB) under UV irradiation. The CP/HPW films formed on bacterial cellulose (BC) showed good photochromic response which is enhanced in presence of TiO<SUB>2</SUB> due to an interfacial electron transfer from Ti<SUB>2</SUB> to HPW. This simple and environmentally safe method can be used to form coatings on a variety of surfaces with photoactive TiO<SUB>2</SUB> and TiO<SUB>2</SUB>/HPW films. Facultad de Ciencias Exactas Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas |
| description |
A versatile layer-by-layer (LbL) procedure for the preparation of highly dispersed, adherent and porous multilayer films of TiO<SUB>2</SUB> nanoparticles (NPs) and phosphotungstic acid (HPW) on a variety of substrates at room temperature was developed based on the use of cellulose phosphate (CP) as an efficient and non-conventional polyelectrolyte. UV/vis absorption spectroscopy confirmed the linear and regular growth of the films with the number of immersion cycles and a strong adsorption ability of CP towards TiO<SUB>2</SUB> NPs. FTIR spectroscopy showed that HPW binds to the surface of TiO<SUB>2</SUB> through the oxygen atom at the corner of the Keggin structure. XPS results showed that the interaction between TiO<SUB>2</SUB> and CP is through Ti-O-P linkage. A model is proposed for the TiO<SUB>2</SUB>-HPW interaction based on XPS and FTIR results. FEG/SEM study of the surface morphology revealed a porous film structure with a homogenous distribution of the TiO<SUB>2</SUB> NPs induced by CP. HRTEM studies showed that the resulting composite films consist of crystalline anatase and rutile phases and poly-nano-crystalline HPW with a semi-crystalline TiO<SUB>2</SUB>-HPW interface. These CP/TiO<SUB>2</SUB> and CP/TiO<SUB>2</SUB>/HPW LbL films showed good photoactivity against both saturated and unsaturated species, for instance, stearic acid (SA), crystal violet (CV) and methylene blue (MB) under UV irradiation. The CP/HPW films formed on bacterial cellulose (BC) showed good photochromic response which is enhanced in presence of TiO<SUB>2</SUB> due to an interfacial electron transfer from Ti<SUB>2</SUB> to HPW. This simple and environmentally safe method can be used to form coatings on a variety of surfaces with photoactive TiO<SUB>2</SUB> and TiO<SUB>2</SUB>/HPW films. |
| publishDate |
2013 |
| dc.date.none.fl_str_mv |
2013 |
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eng |
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eng |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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