Synthesis and characterization of Ag-doped TiO 2 nanotubes - Details

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Abstract：

Composite　TiO　2　nanotubes　with　Ag-doped　were　synthesized　for　the　first　time　using　the　alkaline　fusion　and　hydrothermal　method　under　ambient　atmosphere.　Compared　with　the　raw　materials　increased　2.3　times,　the　specific　surface　of　TiO　2　nanotubes　was　82　m　2/g　by　nitrogen　adsorption.　The　nanotubes　were　then　characterized　by　XRD,　TEM　and　XPS　techniques.　Research　demonstrates　that　metal　silver　and　silver　oxide　coexisted　in　the　composite　TiO　2　nanotubes　which　were　composed　of　anatase　and　rutile.　Since　the　ratio　of　length　to　diameter　rose,　both　height　and　intensity　of　the　diffraction　peak　decreased　significantly.　UV-Vis　absorption　spectra　of　TiO　2　nanotubes　were　shifted　by　40　nm　for　Ag-doped.　This　is　because　of　the　formation　of　Schottky　on　the　surface　of　TiO　2　nanotubes　and　formation　of　impurity　level　between　TiO　2　band　gaps.　Decrease　in　the　apparent　band　gap　contributed　to　the　migration　of　photoelectrons,　reducing　the　electron-hole　recombination.　The　acidic　active　sites　were　increased　by　the　hydroxyl　(-OH)　on　the　surface　of　TiO　2　nanotubes,　which　enhanced　the　photo-oxidation　of　holes　in　the　valence　band.

Keyword：

Ag-doped; Alkaline fusion; Characterization; Red shift; Schottky barrier; TiO 2 nanotubes

Community：

[ 1 ] [Li, J.-L.]College of Material Science and Engineering, Fuzhou University, Fuzhou 350108, China
[ 2 ] [Li, J.-L.]Department of Environment and Equipment Engineering, Fujian University of Technology, Fuzhou 350108, China
[ 3 ] [Chen, W.-Z.]College of Material Science and Engineering, Fuzhou University, Fuzhou 350108, China
[ 4 ] [Chen, W.-Z.]Department of Environment and Equipment Engineering, Fujian University of Technology, Fuzhou 350108, China
[ 5 ] [Wu, B.]College of Material Science and Engineering, Fuzhou University, Fuzhou 350108, China
[ 6 ] [Huang, S.-Z.]Fujian Key Laboratory of Microelectronics and Integrate Circuit, Fuzhou 350108, China
[ 7 ] [Lin, W.]Fujian Key Laboratory of Microelectronics and Integrate Circuit, Fuzhou 350108, China
[ 8 ] [Li, S.-P.]Department of Environment and Equipment Engineering, Fujian University of Technology, Fuzhou 350108, China
[ 9 ] [Cao, X.-X.]Department of Environment and Equipment Engineering, Fujian University of Technology, Fuzhou 350108, China
[ 10 ] [Weng, Q.]Department of Environment and Equipment Engineering, Fujian University of Technology, Fuzhou 350108, China
[ 11 ] [Wang, M.]College of Material Science and Engineering, Fuzhou University, Fuzhou 350108, China

Reprint 's Address：

[Li, J.-L.]College of Material Science and Engineering, Fuzhou University, Fuzhou 350108, China

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Source ：

Journal of Functional Materials

ISSN： 1001-9731

Year： 2012

Issue： 8

Volume： 43

Page： 953-957

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