Band gap enhancement of glancing angle deposited TiO{sub 2} nanowire array

Chinnamuthu, P.; Mondal, A.; Singh, N. K.; Dhar, J. C.; Chattopadhyay, K. K.; Bhattacharya, Sekhar

doi:10.1063/1.4749801

Title: Band gap enhancement of glancing angle deposited TiO{sub 2} nanowire array

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Abstract

Vertically oriented TiO{sub 2} nanowire (NW) arrays were fabricated by glancing angle deposition technique. Field emission-scanning electron microscopy shows the formation of two different diameters {approx}80 nm and {approx}40 nm TiO{sub 2} 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 TiO{sub 2}. 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{sup -1} of anatase E{sub g}) and blue (7.4 cm{sup -1} of rutile E{sub g}, 7.8 cm{sup -1} of rutile A{sub 1g}) shifts of Raman frequencies were observed. UV-vis absorption measurements show the main band absorption at 3.42 eV, 3.48 eV, and {approx}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.

Authors:

Chinnamuthu, P.; Mondal, A.; Singh, N. K.; Dhar, J. C. ^[1]; Chattopadhyay, K. K. ^[2]; Bhattacharya, Sekhar ^[3]

National Institute of Technology Agartala, Department of Electronics and Communication Engineering, Jirania, Tripura (West) 799055 (India)
Jadavpur University, Department of Physics, Kolkata 700032 (India)
SSN Research Centre, Tamil Nadu 603110 (India)

Publication Date:: Sat Sep 01 00:00:00 EDT 2012

OSTI Identifier:: 22089436

Resource Type:: Journal Article

Journal Name:: Journal of Applied Physics

Additional Journal Information:: Journal Volume: 112; Journal Issue: 5; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979

Country of Publication:: United States

Language:: English

Subject:: 77 NANOSCIENCE AND NANOTECHNOLOGY; ELECTRON BEAMS; ENERGY GAP; FIELD EMISSION; PHOTOLUMINESCENCE; PHOTONS; QUANTUM WIRES; RAMAN EFFECT; RAMAN SPECTRA; RUTILE; SCANNING ELECTRON MICROSCOPY; SEMICONDUCTOR MATERIALS; SUBSTRATES; THIN FILMS; TITANIUM OXIDES; ULTRAVIOLET SPECTRA; VISIBLE SPECTRA; X-RAY DIFFRACTION

Citation Formats


                    Chinnamuthu, P., Mondal, A., Singh, N. K., Dhar, J. C., Chattopadhyay, K. K., and Bhattacharya, Sekhar. Band gap enhancement of glancing angle deposited TiO{sub 2} nanowire array.  United States: N. p., 2012. 
        Web.  doi:10.1063/1.4749801.

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                    Chinnamuthu, P., Mondal, A., Singh, N. K., Dhar, J. C., Chattopadhyay, K. K., & Bhattacharya, Sekhar. Band gap enhancement of glancing angle deposited TiO{sub 2} nanowire array.  United States.  https://doi.org/10.1063/1.4749801

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                    Chinnamuthu, P., Mondal, A., Singh, N. K., Dhar, J. C., Chattopadhyay, K. K., and Bhattacharya, Sekhar. 2012.  
        "Band gap enhancement of glancing angle deposited TiO{sub 2} nanowire array".  United States.  https://doi.org/10.1063/1.4749801.

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@article{osti_22089436,

  title        = {Band gap enhancement of glancing angle deposited TiO{sub 2} nanowire array},

  author       = {Chinnamuthu, P. and Mondal, A. and Singh, N. K. and Dhar, J. C. and Chattopadhyay, K. K. and Bhattacharya, Sekhar},

  abstractNote = {Vertically oriented TiO{sub 2} nanowire (NW) arrays were fabricated by glancing angle deposition technique. Field emission-scanning electron microscopy shows the formation of two different diameters {approx}80 nm and {approx}40 nm TiO{sub 2} 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 TiO{sub 2}. 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{sup -1} of anatase E{sub g}) and blue (7.4 cm{sup -1} of rutile E{sub g}, 7.8 cm{sup -1} of rutile A{sub 1g}) shifts of Raman frequencies were observed. UV-vis absorption measurements show the main band absorption at 3.42 eV, 3.48 eV, and {approx}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.},

  doi          = {10.1063/1.4749801},

  url          = {https://www.osti.gov/biblio/22089436},
  journal      = {Journal of Applied Physics},

  issn         = {0021-8979},

  number       = 5,

  volume       = 112,

  place        = {United States},

  year         = {Sat Sep 01 00:00:00 EDT 2012},

  month        = {Sat Sep 01 00:00:00 EDT 2012}

}

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