Photo-enhanced field emission study of TiO2 nanotubes array

Chavan, Padmakar G.; Shende, Sugat V.; Joag, Dilip S.; More, Mahendra A.

doi:10.1016/j.ultramic.2010.11.001

Cited by 15 publications

(6 citation statements)

References 33 publications

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“…The electron emission quantum tunneling turn on and threshold field were found to be 4.06 and 7.06 V/µm at emission current densities of 10 and 100 µA/cm 2 respectively of TiO 2 nanorods. These values suggest that better turn on field of TiO 2 nanorods are recorded as compared to the ones reported in literature [89][90][91]. We have obtained the maximum current density of the TiO 2 nanorods to be 168 µA/cm 2 at an applied field of 7.35 V/µm.…”

Section: Resultssupporting

confidence: 69%

Investigation of growth mechanism for highly oriented TiO2 nanorods: the role of reaction time and annealing temperature

et al. 2019

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Titanium dioxide (TiO 2) is a versatile and inexpensive material for extended applicability in several scientific and technological fields including photo-catalysis for industrial waste treatment, energy harvesting, and hydrogen production. In this work, we report the synthesis of TiO 2 thin film using hydrothermal method and investigations on the influence of reaction time and annealing temperature on growth mechanism of the TiO 2 nanorods. The synthesized TiO 2 films were studied by using UV-visible spectroscopy, Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscope and energy-dispersive X-ray spectroscopy (EDS). The XRD and Raman measurements revealed the formation of defect free and pure tetragonal TiO 2 rutile phase. The TiO 2 thin films show absorption band edge at around 420 nm in the UVvisible spectrum and exhibit direct band gap value of 2.9 eV. The TiO 2 nanorods are demonstrated to grow randomly on the FTO substrate with changing reaction times but grow uniformly in a flower-like pattern with increasing annealing temperature. Investigation of the field emission properties of TiO 2 thin films (tested as field-emitter array) estimates the turn-on and threshold field at 4.06 and 7.06 V/µm at 10 and 100 µA/cm 2 , respectively.

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Section: Resultssupporting

confidence: 69%

Investigation of growth mechanism for highly oriented TiO2 nanorods: the role of reaction time and annealing temperature

et al. 2019

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“…1D or 0D) favor for the formation of anatase phase. 8,9,11,17,34,35 Furthermore, faster nucleation process than the growth leads to the lower size morphologies. Synthesis of TiO 2 nanorods is carried out by heating Ti-metal lament at a higher temperature in the absence of additional reactants.…”

Section: Resultsmentioning

confidence: 99%

Promising field electron emission performance of vertically aligned one dimensional (1D) brookite (β) TiO₂nanorods

Devan

et al. 2016

RSC Adv.

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We evidence field-electron emission (FE) studies on the large-area array of one-dimensional (1D) brookite (b) TiO 2 nanorods. The pure 1D b-TiO 2 nanorods of 10 nm width and 760 nm long were synthesized on Si substrate utilizing hot-filament metal vapor deposition technique. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analysis evidenced the b-TiO 2 nanorods to be composed of orthorhombic crystals in brookite (b) phase. X-ray photoemission spectroscopy (XPS) revealed the formation of pure stoichiometric (i.e. 1 : 1.98) 1D TiO 2 nanorods. The values of turn-on field, required to draw current density of 10 mA cm À2 , was observed 3.9 V mm À1 for pristine 1D b-TiO 2 nanorods emitters, which were found significantly lower than doped/undoped 1D TiO 2 nanostructures (i.e. nanotubes, nanowires, nanorods) based field emitters. The enhanced FE behavior of the TiO 2 /Si emitter can be attributed to modulation of electronic properties due to the high aspect ratio of vertically aligned TiO 2 nanorods. Furthermore, the orthodox emission situation of pristine TiO 2 /Si emitters exhibit good emission stability and reveal their potentials as promising FE material.

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“…The emission current was found to increase very rapidly with an increase in the applied voltage and an emission current of y6.93 mA has been drawn at an applied voltage of y6.8 kV, which is lower than single/multiemitters of other semiconductors. 28,29 The emitting area, calculated from the SEM image, is found to be y6.28 6 10 24 cm 2 . From this the estimated current density (J = I/A) is found to be y11 mA cm 22 .…”

Section: Field Emissionmentioning

confidence: 95%

Controlled synthesis of aligned Bi₂S₃nanowires, sharp apex nanowires and nanobelts with its morphology dependent field emission investigations

et al. 2013

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Well-aligned ultra-long Bi 2 S 3 nanowire arrays with three kinds of apex morphology -abruptly sharpened apex, thin belt and flat -have been systematically fabricated on tungsten (W) foil by a facile hydrothermal method. The structural and morphological studies reveal formation of distinct tip morphologies, possessing high aspect ratio, single crystalline nature and growth along the orthorhombic [001] axis. A plausible growth mechanism has been proposed on the basis of observed experimental results. The field emission properties of Bi 2 S 3 nanowires and sharp apex Bi 2 S 3 nanowires are investigated. From the field emission studies, the values of the turn-on field, required to draw emission current density of y0.1 mA cm 22 , are observed to be y2.01 and 1.21 V mm 21 for nanowires and sharp apex nanowires, respectively. Furthermore, ultra-long Bi 2 S 3 nanowires are also grown on the W microtip (brush-like) from which very high emission current density y11 mA cm 22 has been drawn. These results are helpful for the design, fabrication and optimization of integrated field emitters using 1D nanostructures as cold cathode material.

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Photo-enhanced field emission study of TiO2 nanotubes array

Cited by 15 publications

References 33 publications

Investigation of growth mechanism for highly oriented TiO2 nanorods: the role of reaction time and annealing temperature

Investigation of growth mechanism for highly oriented TiO2 nanorods: the role of reaction time and annealing temperature

Promising field electron emission performance of vertically aligned one dimensional (1D) brookite (β) TiO₂nanorods

Controlled synthesis of aligned Bi₂S₃nanowires, sharp apex nanowires and nanobelts with its morphology dependent field emission investigations

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Photo-enhanced field emission study of TiO2 nanotubes array

Cited by 15 publications

References 33 publications

Investigation of growth mechanism for highly oriented TiO2 nanorods: the role of reaction time and annealing temperature

Investigation of growth mechanism for highly oriented TiO2 nanorods: the role of reaction time and annealing temperature

Promising field electron emission performance of vertically aligned one dimensional (1D) brookite (β) TiO2nanorods

Controlled synthesis of aligned Bi2S3nanowires, sharp apex nanowires and nanobelts with its morphology dependent field emission investigations

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Promising field electron emission performance of vertically aligned one dimensional (1D) brookite (β) TiO₂nanorods

Controlled synthesis of aligned Bi₂S₃nanowires, sharp apex nanowires and nanobelts with its morphology dependent field emission investigations