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Nanoporous characteristics of sol-gel-derived ZnO thin film

Journal of Semiconductors 2012年第4期33卷 7-12页

作者： Anees A.Ansari M.A.M.Khan M.Alhoshan S.A.Alrokayan M.S.Alsalhi King Abdullah Institute for Nanotechnology King Saud UniversityRiyadh-11451P.O.Box-2454Saudi Arabia Department of Chemical Engineering King Saud UniversityP.O.Box 800Riyadh 11421Saudi Arabia

Sol-gel-derived nanoporous ZnO film has been successfully deposited on glass substrate at 200 °C and subsequently annealed at different temperatures of 300, 400 and 600 °C. Atomic force micrographs demonstrated that the film was crack-free, and that granular nanoparticles were homogenously distributed on the film surface. The average grain size of the nanoparticles and RMS roughness of the scanned surface area was 10 nm and 13.6 nm, respectively, which is due to the high porosity of the film. Photoluminescence （PL） spectra of the nanoporous ZnO film at room temperature show a diffused band, which might be due to an increased amount of oxygen va- cancies on the lattice surface. The observed results of the nanoporous ZnO film indicates a promising application in the development of electrochemical biosensors due to the porosity of film enhancing the higher loading of biomacromolecules （enzyme and proteins）.

关键词： nanoporous ZnO thin film uv/visible absorption photoluminescence

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Electronic structures and optical properties of two anthracene derivatives

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Science Bulletin 2006年第20期51卷 2444-2450页

作者： Peng Zhang Baohui Xia Yinghui Sun Bing Yang Wenjing Tian Yue Wang Guo Zhang Key Laboratory for Supramolecular Structure and Materials of Ministry of Education Jilin University Changchun China Department of Materials Science Jinlin University Changchun China Department of Chemistry Jilin University Changchun China

The electronic structures and the optical properties of two anthracene derivatives, DBMA and DAA, are investigated by both experimental techniques and quantum chemical calculations. The cyclic voltammetry and differential pulse polarograph measurement revealed that the introduction of benzol-imidazol and pyrrolo-pyridine group on the anthracene block can affect the electrochemical behavior of DBMA and DAA. Both uv/visible absorption and emission spectra of DBMA and DAA are red-shifted in contrast to the unsubstituted anthracene, so that the anthracene derivatives emit at blue-green region and the luminescence yields are remarkably elevated (over 90%). The B3LYP/6-31G theoretical calculations explored that the electronic structures of the anthracene derivatives are perturbed by the side substitutes on the anthracene block, and the slight variation of the electronic structures results in the enhanced electron accepting ability and the decrease of the HOMO-LUMO energy gap, which is the origin of the emission to be shifted to blue-green region. The non-planar geometry structures of DBMA and DAA are responsible for the excellent luminescence yields.

关键词： electrochemistry electronic structure uv/visible absorption luminescence density function calculation

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