Electronic Properties of TiO2 Nanoparticles Films and the Effect on Apatite-Forming Ability
Nanoparticle-covered electrodes have altered properties as compared to conventional electrodes with same chemical composition. The changes originate from the large surface area and enhanced conduction. To test the mineralization capacity of such materials, TiO2 nanoparticles were deposited on titani...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | International Journal of Dentistry |
| Online Access: | http://dx.doi.org/10.1155/2013/139615 |
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| author | Johanna Löberg Jenny Perez Holmberg Ingela Mattisson Anna Arvidsson Elisabet Ahlberg |
| author_facet | Johanna Löberg Jenny Perez Holmberg Ingela Mattisson Anna Arvidsson Elisabet Ahlberg |
| author_sort | Johanna Löberg |
| collection | DOAJ |
| description | Nanoparticle-covered electrodes have altered properties as compared to conventional electrodes with same chemical composition. The changes originate from the large surface area and enhanced conduction. To test the mineralization capacity of such materials, TiO2 nanoparticles were deposited on titanium and gold substrates. The electrochemical properties were investigated using cyclic voltammetry and impedance spectroscopy while the mineralization was tested by immersion in simulated body fluid. Two types of nucleation and growth behaviours were observed. For smooth nanoparticle surfaces, the initial nucleation is fast with the formation of few small nuclei of hydroxyapatite. With time, an amorphous 2D film develops with a Ca/P ratio close to 1.5. For the rougher surfaces, the nucleation is delayed but once it starts, thick layers are formed. Also the electronic properties of the oxides were shown to be important. Both density of states (DOS) in the bandgap of TiO2 and the active area were determined. The maximum in DOS was found to correlate with the donor density (Nd) and the active surface area. The results clearly show that a rough surface with high conductivity is beneficial for formation of thick apatite layers, while the nanoparticle covered electrodes show early nucleation but limited apatite formation. |
| format | Article |
| id | doaj-art-9896b0ce6b714ab3863f0ecc581cf785 |
| institution | Kabale University |
| issn | 1687-8728 1687-8736 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Dentistry |
| spelling | doaj-art-9896b0ce6b714ab3863f0ecc581cf7852025-02-03T01:12:36ZengWileyInternational Journal of Dentistry1687-87281687-87362013-01-01201310.1155/2013/139615139615Electronic Properties of TiO2 Nanoparticles Films and the Effect on Apatite-Forming AbilityJohanna Löberg0Jenny Perez Holmberg1Ingela Mattisson2Anna Arvidsson3Elisabet Ahlberg4DENTSPLY Implants, Box 14, 431 21 Mölndal, SwedenDepartment of Chemistry and Molecular Biology, University of Gothenburg, 412 96 Gothenburg, SwedenDENTSPLY Implants, Box 14, 431 21 Mölndal, SwedenDENTSPLY Implants, Box 14, 431 21 Mölndal, SwedenDepartment of Chemistry and Molecular Biology, University of Gothenburg, 412 96 Gothenburg, SwedenNanoparticle-covered electrodes have altered properties as compared to conventional electrodes with same chemical composition. The changes originate from the large surface area and enhanced conduction. To test the mineralization capacity of such materials, TiO2 nanoparticles were deposited on titanium and gold substrates. The electrochemical properties were investigated using cyclic voltammetry and impedance spectroscopy while the mineralization was tested by immersion in simulated body fluid. Two types of nucleation and growth behaviours were observed. For smooth nanoparticle surfaces, the initial nucleation is fast with the formation of few small nuclei of hydroxyapatite. With time, an amorphous 2D film develops with a Ca/P ratio close to 1.5. For the rougher surfaces, the nucleation is delayed but once it starts, thick layers are formed. Also the electronic properties of the oxides were shown to be important. Both density of states (DOS) in the bandgap of TiO2 and the active area were determined. The maximum in DOS was found to correlate with the donor density (Nd) and the active surface area. The results clearly show that a rough surface with high conductivity is beneficial for formation of thick apatite layers, while the nanoparticle covered electrodes show early nucleation but limited apatite formation.http://dx.doi.org/10.1155/2013/139615 |
| spellingShingle | Johanna Löberg Jenny Perez Holmberg Ingela Mattisson Anna Arvidsson Elisabet Ahlberg Electronic Properties of TiO2 Nanoparticles Films and the Effect on Apatite-Forming Ability International Journal of Dentistry |
| title | Electronic Properties of TiO2 Nanoparticles Films and the Effect on Apatite-Forming Ability |
| title_full | Electronic Properties of TiO2 Nanoparticles Films and the Effect on Apatite-Forming Ability |
| title_fullStr | Electronic Properties of TiO2 Nanoparticles Films and the Effect on Apatite-Forming Ability |
| title_full_unstemmed | Electronic Properties of TiO2 Nanoparticles Films and the Effect on Apatite-Forming Ability |
| title_short | Electronic Properties of TiO2 Nanoparticles Films and the Effect on Apatite-Forming Ability |
| title_sort | electronic properties of tio2 nanoparticles films and the effect on apatite forming ability |
| url | http://dx.doi.org/10.1155/2013/139615 |
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