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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Choi, Sung Kyu Kim, Soonhyun Ryu, Jungho Lim, Sang Kyoo Park, Hyunwoong |
| Description | Author Affiliation: Choi SK ( Department of Physics, Kyungpook National University, Daegu 702-701, Korea.) |
| Abstract | Directionally grown $TiO_{2}$ nano-architectures can serve as effective platforms for photogenerated charges to flow vectorially through the architecture framework, promising an unexpectedly high efficiency. This study demonstrates that directionally aligned $TiO_{2}$ nanofibers (TNF) obtained via a simple rearrangement of randomly scattered $TiO_{2}$ nanoparticles (TNP) exhibit significantly enhanced activity in terms of hydrogen production from water under visible light (λ > 420 nm). It has been found that Eosin Y (EY)-sensitized hydrogen production with TNF is greater than those with TNP and commercial $TiO_{2}$ samples (Degussa P25 and Hombikat UV-100) by a factor of 7 and >140, respectively, in the presence of triethanolamine (TEOA) as an electron donor. The annealing of TNF at elevated temperatures reduces the amount of $H_{2}$ produced and changes various physicochemical properties. Attempts have been made to find correlation factors between hydrogen production and reaction parameters (e.g., pH-dependent EY adsorption, surface area, pore size, particle size, and anatase-to-rutile ratio), none of which have provided an apparent correlation. It was suggested that the interparticle electron transfer is facilitated when $TiO_{2}$ nanoparticles are physically interconnected, and TNF might work as a robust photo-antenna for efficiently collecting the photogenerated electrons. The photocurrent measurements in visible light-irradiated $EY/TiO_{2}$ suspensions indicate that the photocurrent of TNF is 50% higher than that of TNP, supporting the photo-antenna mechanism of TNF. |
| File Format | HTM / HTML |
| ISSN | 1474905X |
| Issue Number | 9 |
| Volume Number | 11 |
| e-ISSN | 14749092 |
| Journal | Photochemical & Photobiological Sciences |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Publisher Date | 2012-09-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Chemistry Discipline Biology Coloring Agents Chemistry Hydrogen Nanofibers Titanium Eosine Yellowish-(ys) Hydrogen-ion Concentration Metal Nanoparticles Sunlight Water Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physical and Theoretical Chemistry |
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