Structural transformations and their relation to the optoelectronic properties of chromium oxide thin films

Ivanova, T.; Gesheva, K.A.; Cziráki, Á.; Szekeres, A.; Vlaikova, E.

doi:10.1088/1742-6596/113/1/012030

Cited by 46 publications

(33 citation statements)

References 9 publications

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“…24 In the present investigation, the observed peaks illustrate the characteristic peaks of Cr-O bond stretching vibration. 5 As the spectrum reveals the corresponding vibration bands of Cr-O only which in turn depicts the successful removal of impurity contents during calcinations and the high purity of the as-grown Cr2O3 nanostructures. 8 High intensity of the peaks of Cr 2 O 3 bands indicates the good crystalline nature of the materials.…”

Section: Optical Analysismentioning

confidence: 91%

“…7 It has wide variety of applications such as: catalysts, hydrogen storage, wear resistance materials, dye and pigment, advanced colorants, digital recording system, black matrix films, solar energy application, coating materials for thermal protection, and electrochromic material. 2,5,[8][9][10][11] It expresses high electrical conductivity with partial or complete electron transfer. 12 It is treated as an important refractory material because of its high melting temperature (≈2300 • C) and hightemperature oxidation resistance, although it shows poor sintering ability which is possibly because of low density factor.…”

Section: Introductionmentioning

confidence: 99%

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Structural and optical characterization of Cr2O3 nanostructures: Evaluation of its dielectric properties

Abdullah¹,

Rajab²,

Al-Abbas³

2014

AIP Advances

199

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Articles you may be interested inThe Cr-substitution concentration dependence of the structural, electric and magnetic behaviors for Aurivillius Bi5Ti3FeO15 multiferroic ceramics J. Appl. Phys. 114, 234101 (2013); 10.1063/1.4849055Conversion of CH4/CO2 to syngas over Ni-Co/Al2O3-ZrO2 nanocatalyst synthesized via plasma assisted coimpregnation method: Surface properties and catalytic performance Synthesis of TiO 2 nanoparticles by hydrolysis and peptization of titanium isopropoxide solution AIP Conf.The structural, optical and dielectric properties of as-grown Cr 2 O 3 nanostructures are demonstrated in this paper. Powder X-ray diffractometry analysis confirmed the rhombohedral structure of the material with lattice parameter, a = b = 4.953 Å; c = 13.578 Å, and average crystallize size (62.40 ± 21.3) nm. FE-SEM image illustrated the mixture of different shapes (disk, particle and rod) of as-grown nanostructures whereas; EDS spectrum confirmed the elemental purity of the material. FTIR spectroscopy, revealed the characteristic peaks of Cr-O bond stretching vibrations. Energy band gap (3.2 eV) of the nanostructures has been determined using the results of UV-VIS-NIR spectrophotometer. The dielectric properties of the material were checked in the wide frequency region (100Hz-30 MHz). In the low frequency region, the matrix of the dielectric behaves like source as well as sink of electrical energy within the relaxation time. Low value of dielectric loss exhibits that the materials posses good optical quality with lesser defects. The ac conductivity of the material in the high frequency region was found according to frequency power law. The physical-mechanism and the theoretical-interpretation of dielectric-properties of Cr 2 O 3 nanostructures attest the potential candidature of the material as an efficient dielectric medium. C 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

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Section: Optical Analysismentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Structural and optical characterization of Cr2O3 nanostructures: Evaluation of its dielectric properties

Abdullah¹,

Rajab²,

Al-Abbas³

2014

AIP Advances

199

View full text Add to dashboard Cite

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“…These spectra are seen to be in good agreement with the measured data. For the simulations we assumed that the chromium adhesion layer had oxidized to Cr 2 O 3 and used a frequency-independent refractive index of n a ¼ 2.2 þ 0.5i for the adhesion layer [44,45]. Also, we took the values of the refractive index of gold from [46] and used a 15-nm thickness for the discs to best match the resonant features in the measured curves.…”

Section: Metasurface Design and Experimentsmentioning

confidence: 99%

Bifacial Metasurface with Quadrupole Optical Response

et al. 2015

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We design, fabricate, and characterize a metasurface, whose multipole optical response depends significantly on the illumination direction. The metasurface is composed of gold-nanodisc dimers embedded in glass. In spite of their nanoscale size, the dimers exhibit a dominating electric-currentquadrupole response in a wide range of wavelengths around 700 nm when illuminated from one side, and a primarily electric-dipole response when illuminated from the opposite side. This leads to two consequences. First, the reflection coefficient of the metasurface considerably differs for the two sides of illumination. Second, quadrupole excitation results in a significant local enhancement of both electric and magnetic fields around the dimers. Our experimental spectroscopic data are in good agreement with simulations obtained using a multipole expansion model.

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“…The FTIR pattern of the as-received powders reflects the absorption bands corresponding to Cu 2 O and CuO mainly [11]. However, the oxidized powder shows the bands for CuO strongly along with Cu 2 O and Cr 2 O 3 absorption bands [12]. The absorption bands corresponding to Cr 2 O 3 is also obtained for oxidized and reduced powders.…”

Section: Elementmentioning

confidence: 89%

Effect of powder oxidation on densification and properties of vacuum hot pressed Cu–Cr–Nb alloy

Shukla

Samuel

Kumar

et al. 2013

Materials Science and Engineering: A

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Structural transformations and their relation to the optoelectronic properties of chromium oxide thin films

Cited by 46 publications

References 9 publications

Structural and optical characterization of Cr2O3 nanostructures: Evaluation of its dielectric properties

Structural and optical characterization of Cr2O3 nanostructures: Evaluation of its dielectric properties

Bifacial Metasurface with Quadrupole Optical Response

Effect of powder oxidation on densification and properties of vacuum hot pressed Cu–Cr–Nb alloy

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