Optical properties of crystalline and non-crystalline iron oxide thin films deposited by spray pyrolysis

Akl, Alaa A.

doi:10.1016/j.apsusc.2004.03.263

Cited by 125 publications

(57 citation statements)

References 20 publications

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“…Nevertheless, the calculated values of the refractive index and extinction coefficient from [18], varies in the range of 0.5 < n < 1.25 and 0.1 < k < 0.5 for crystalline -Fe 2 O 3 sprayed thin films. One notices a rather large variation from the results found in this work.…”

Section: 22mentioning

confidence: 99%

“…For thin films, sol-gel [11,12], chemical bath deposition [13], reactive evaporation [14,15] and spray pyrolysis [16][17][18][19][20][21]. The elaboration techniques and also the corresponding references given above are not exhaustive.…”

Section: Introductionmentioning

confidence: 99%

“…This technique is used by many researchers to deposit thin layers of iron oxides using different chemical solutions [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Some Structural and Optical Properties of sprayed Iron Oxide Thin films

Tomsah¹

2017

IOSR JAP

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Section: 22mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Some Structural and Optical Properties of sprayed Iron Oxide Thin films

Tomsah¹

2017

IOSR JAP

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“…It is well accepted that the band edge of ␣-Fe 2 O 3 is located in the range of ͑2.00-2.20͒ eV. [34][35][36] The transitions in this energy region include the d-d transitions, pair excitation, and less charge transfer, and the former two transitions mainly come from the narrow d bands, so the optical properties of hematite band edge cannot be accounted for intrinsic semiconductor. Han et al 37 recently reported room temperature PL of ␣-Fe 2 O 3 nanowires with a band gap of 2.14 eV, while PL spectra from capped and naked ␣-Fe 2 O 3 nanocrystals indicate band gaps in the 1.93-2.12 eV range.…”

Section: -5mentioning

confidence: 99%

Shape-controlled synthesis and cathodoluminescence properties of elongated α-Fe2O3 nanostructures

Chioncel¹,

Dı́az-Guerra²,

Piqueras³

2008

Journal of Applied Physics

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α -Fe 2 O 3 (hematite) nanostructures with various morphologies have been grown by thermal oxidation of compacted iron powder at temperatures between 700 and 900 °C. Different thermal treatments have been found to induce the growth of single-crystalline nanowires, nanobelts, nanoplates and featherlike structures, free and caped nanopillars, and pyramidal microcrystals or cactuslike microstructures. The experimental conditions leading to the different morphologies have been systematically investigated, as well as the possible growth mechanisms. The obtained nanostructures have been characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy, x-ray diffraction, and cathodoluminescence (CL) spectroscopy in the SEM. The formation of the nanostructures induces changes in the intensity and spectral distribution of the CL emission, as compared with the bulk material. Ligand to metal charge transfer transitions as well as Fe3+ ligand field transitions are thought to be involved in the observed luminescence. The evolution of the panchromatic CL intensity in the visible range as a function of temperature shows some anomalies that may be induced by magnetic ordering effects.

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“…A lot work has been reported using this method since Fujishima and Honda [1] first demonstrated the photoelectrochemical behaviour of TiO 2 photoelectrode in contact with aqueous solution. Hematite (α-Fe 2 O 3 ) on account of its ideal band gap energy of 1.9 to 2.2 eV [2][3][4], abundance, non-toxiticy and chemical stability in wide pH range remains a promising photoanode material [5][6][7]. Although hematite possess many advantages, but due to some limitations like short hole diffusion length, high carrier recombination rate and conduction band edge position [8], PEC performance of the hematite photoanode is much below its theoretical solar to chemical conversion efficiency of 12.9% [9].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical preparation of hematite nanostructured films for solar hydrogen production

Kazemi

Maghsoudipour

Ebadzadeh

2012

EPJ Web of Conferences

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Abstract. Photoelectrochemical water splitting is a clean and promising technique for using a renewable source of energy, i.e., solar energy, to produce hydrogen. In this work electrochemical formation of iron oxyhydroxide and its conversion to hematite (α-Fe 2 O 3 ) through thermal treatment have been studied. Oxyhydroxide iron compounds have been prepared onto SnO 2 /F covered glass substrate by potential cycling with two different potential sweep rate values; then calcined at 520 o C in air to obtain α -Fe 2 O 3 nanostrutured films for their implementation as photoanode in a photoelectrochemical cell. X-ray diffraction analysis allowed finding that iron oxides films have nanocrystalline character. Scanning electron microscopy revealed that films have nanostructured morphology. The obtained results are discussed considering the influence of potential sweep rate employed during the preparation of iron oxyhydroxide film on optical, structural and morphological properties of hematite nanostructured films. Results show that films have acceptable characteristics as photoanode in a photoelectrochemical cell for hydrogen generation from water.

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Optical properties of crystalline and non-crystalline iron oxide thin films deposited by spray pyrolysis

Cited by 125 publications

References 20 publications

Some Structural and Optical Properties of sprayed Iron Oxide Thin films

Some Structural and Optical Properties of sprayed Iron Oxide Thin films

Shape-controlled synthesis and cathodoluminescence properties of elongated α-Fe2O3 nanostructures

Electrochemical preparation of hematite nanostructured films for solar hydrogen production

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