Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid
A versatile layer-by-layer (LbL) procedure for the preparation of highly dispersed, adherent and porous multilayer films of TiO 2 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 efficie...
Guardado en:
| Autores principales: | , , , , , , |
|---|---|
| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_01694332_v277_n_p111_Ullah |
| Aporte de: |
| id |
todo:paper_01694332_v277_n_p111_Ullah |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_01694332_v277_n_p111_Ullah2023-10-03T15:07:08Z Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid Ullah, S. Acuña, J.J.S. Pasa, A.A. Bilmes, S.A. Vela, M.E. Benitez, G. Rodrigues-Filho, U.P. Cellulose phosphate Layer-by-Layer Photocatalysis Photochromism Titania Phosphotungstic acid Absorption spectroscopy Aromatic compounds Boron carbide Cellulose Cellulose films Crystal atomic structure Crystalline materials Dyes Film preparation Fourier transform infrared spectroscopy Interfaces (materials) Irradiation Nanocomposite films Oxide minerals Photocatalysis Photochromism Polyelectrolytes Titanium dioxide X ray photoelectron spectroscopy Adsorption ability Bacterial cellulose Cellulose phosphate Environmentally safe Interfacial electron transfer Layer by layer Phosphotungstic acid TiO2 nano-particles Multilayer films Aromatic Compounds Boron Compounds Catalysts Cellulose Derivatives Fourier Analysis Interfaces Oxides Titanium Dioxide A versatile layer-by-layer (LbL) procedure for the preparation of highly dispersed, adherent and porous multilayer films of TiO 2 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 2 NPs. FTIR spectroscopy showed that HPW binds to the surface of TiO 2 through the oxygen atom at the corner of the Keggin structure. XPS results showed that the interaction between TiO 2 and CP is through Ti-O-P linkage. A model is proposed for the TiO 2 -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 2 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 2 -HPW interface. These CP/TiO 2 and CP/TiO 2 /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 2 due to an interfacial electron transfer from TiO 2 to HPW. This simple and environmentally safe method can be used to form coatings on a variety of surfaces with photoactive TiO 2 and TiO 2 /HPW films. © 2013 Elsevier B.V. All rights reserved. Fil:Bilmes, S.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01694332_v277_n_p111_Ullah |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Cellulose phosphate Layer-by-Layer Photocatalysis Photochromism Titania Phosphotungstic acid Absorption spectroscopy Aromatic compounds Boron carbide Cellulose Cellulose films Crystal atomic structure Crystalline materials Dyes Film preparation Fourier transform infrared spectroscopy Interfaces (materials) Irradiation Nanocomposite films Oxide minerals Photocatalysis Photochromism Polyelectrolytes Titanium dioxide X ray photoelectron spectroscopy Adsorption ability Bacterial cellulose Cellulose phosphate Environmentally safe Interfacial electron transfer Layer by layer Phosphotungstic acid TiO2 nano-particles Multilayer films Aromatic Compounds Boron Compounds Catalysts Cellulose Derivatives Fourier Analysis Interfaces Oxides Titanium Dioxide |
| spellingShingle |
Cellulose phosphate Layer-by-Layer Photocatalysis Photochromism Titania Phosphotungstic acid Absorption spectroscopy Aromatic compounds Boron carbide Cellulose Cellulose films Crystal atomic structure Crystalline materials Dyes Film preparation Fourier transform infrared spectroscopy Interfaces (materials) Irradiation Nanocomposite films Oxide minerals Photocatalysis Photochromism Polyelectrolytes Titanium dioxide X ray photoelectron spectroscopy Adsorption ability Bacterial cellulose Cellulose phosphate Environmentally safe Interfacial electron transfer Layer by layer Phosphotungstic acid TiO2 nano-particles Multilayer films Aromatic Compounds Boron Compounds Catalysts Cellulose Derivatives Fourier Analysis Interfaces Oxides Titanium Dioxide Ullah, S. Acuña, J.J.S. Pasa, A.A. Bilmes, S.A. Vela, M.E. Benitez, G. Rodrigues-Filho, U.P. Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid |
| topic_facet |
Cellulose phosphate Layer-by-Layer Photocatalysis Photochromism Titania Phosphotungstic acid Absorption spectroscopy Aromatic compounds Boron carbide Cellulose Cellulose films Crystal atomic structure Crystalline materials Dyes Film preparation Fourier transform infrared spectroscopy Interfaces (materials) Irradiation Nanocomposite films Oxide minerals Photocatalysis Photochromism Polyelectrolytes Titanium dioxide X ray photoelectron spectroscopy Adsorption ability Bacterial cellulose Cellulose phosphate Environmentally safe Interfacial electron transfer Layer by layer Phosphotungstic acid TiO2 nano-particles Multilayer films Aromatic Compounds Boron Compounds Catalysts Cellulose Derivatives Fourier Analysis Interfaces Oxides Titanium Dioxide |
| description |
A versatile layer-by-layer (LbL) procedure for the preparation of highly dispersed, adherent and porous multilayer films of TiO 2 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 2 NPs. FTIR spectroscopy showed that HPW binds to the surface of TiO 2 through the oxygen atom at the corner of the Keggin structure. XPS results showed that the interaction between TiO 2 and CP is through Ti-O-P linkage. A model is proposed for the TiO 2 -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 2 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 2 -HPW interface. These CP/TiO 2 and CP/TiO 2 /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 2 due to an interfacial electron transfer from TiO 2 to HPW. This simple and environmentally safe method can be used to form coatings on a variety of surfaces with photoactive TiO 2 and TiO 2 /HPW films. © 2013 Elsevier B.V. All rights reserved. |
| format |
JOUR |
| author |
Ullah, S. Acuña, J.J.S. Pasa, A.A. Bilmes, S.A. Vela, M.E. Benitez, G. Rodrigues-Filho, U.P. |
| author_facet |
Ullah, S. Acuña, J.J.S. Pasa, A.A. Bilmes, S.A. Vela, M.E. Benitez, G. Rodrigues-Filho, U.P. |
| author_sort |
Ullah, S. |
| title |
Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_01694332_v277_n_p111_Ullah |
| work_keys_str_mv |
AT ullahs photoactivelayerbylayerfilmsofcellulosephosphateandtitaniumdioxidecontainingphosphotungsticacid AT acunajjs photoactivelayerbylayerfilmsofcellulosephosphateandtitaniumdioxidecontainingphosphotungsticacid AT pasaaa photoactivelayerbylayerfilmsofcellulosephosphateandtitaniumdioxidecontainingphosphotungsticacid AT bilmessa photoactivelayerbylayerfilmsofcellulosephosphateandtitaniumdioxidecontainingphosphotungsticacid AT velame photoactivelayerbylayerfilmsofcellulosephosphateandtitaniumdioxidecontainingphosphotungsticacid AT benitezg photoactivelayerbylayerfilmsofcellulosephosphateandtitaniumdioxidecontainingphosphotungsticacid AT rodriguesfilhoup photoactivelayerbylayerfilmsofcellulosephosphateandtitaniumdioxidecontainingphosphotungsticacid |
| _version_ |
1807322398616190976 |