Band gap enhancement of glancing angle deposited TiO2 nanowire array

被引：40

作者：

Chinnamuthu, P. ^{[1
]}

Mondal, A. ^{[1
]}

Singh, N. K. ^{[1
]}

Dhar, J. C. ^{[1
]}

Chattopadhyay, K. K. ^{[2
]}

Bhattacharya, Sekhar

机构：

[1] Natl Inst Technol Agartala, Dept Elect & Commun Engn, Jirania 799055, Tripura West, India

[2] Jadavpur Univ, Dept Phys, Kolkata 700032, India

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 112卷 / 05期

关键词：

THIN-FILMS; RAMAN-SPECTRUM; NANOPHASE TIO2; DOPED TIO2; PHOTOCATALYSIS; TEMPERATURE; ANATASE; LAYERS;

D O I：

10.1063/1.4749801

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Vertically oriented TiO2 nanowire (NW) arrays were fabricated by glancing angle deposition technique. Field emission-scanning electron microscopy shows the formation of two different diameters similar to 80 nm and similar to 40 nm TiO2 NW for 120 and 460 rpm azimuthal rotation of the substrate. The x-ray diffraction and Raman scattering depicted the presence of rutile and anatase phase TiO2. The overall Raman scattering intensity decreased with nanowire diameter. The role of phonon confinement in anatase and rutile peaks has been discussed. The red (7.9 cm(-1) of anatase E-g) and blue (7.4 cm(-1) of rutile E-g, 7.8 cm(-1) of rutile A(1g)) shifts of Raman frequencies were observed. UV-vis absorption measurements show the main band absorption at 3.42 eV, 3.48 eV, and similar to 3.51 eV for thin film and NW prepared at 120 and 460 rpm, respectively. Three fold enhance photon absorption and intense light emission were observed for NW assembly. The photoluminescence emission from the NW assembly revealed blue shift in main band transition due to quantum confinement in NW structures. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4749801]

引用

页数：6

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