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<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 phosph...
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| Autores principales: | , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2013
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/85563 |
| Aporte de: |
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I19-R120-10915-85563 |
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dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas Cellulose phosphate Layer-by-Layer Photocatalysis Photochromism Titania Phosphotungstic acid |
| spellingShingle |
Ciencias Exactas Cellulose phosphate Layer-by-Layer Photocatalysis Photochromism Titania Phosphotungstic acid Ullah, Sajjad Sáez Acuña, José Javier Pasa, André Avelino Bilmes, Sara Aldabe Vela, María Elena Benitez, Guillermo Alfredo Rodrigues Filho, Ubirajara Pereira Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid |
| topic_facet |
Ciencias Exactas Cellulose phosphate Layer-by-Layer Photocatalysis Photochromism Titania Phosphotungstic acid |
| 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. |
| format |
Articulo Articulo |
| author |
Ullah, Sajjad Sáez Acuña, José Javier Pasa, André Avelino Bilmes, Sara Aldabe Vela, María Elena Benitez, Guillermo Alfredo Rodrigues Filho, Ubirajara Pereira |
| 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_sort |
Ullah, Sajjad |
| 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 |
| publishDate |
2013 |
| url |
http://sedici.unlp.edu.ar/handle/10915/85563 |
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