Pulsed Laser Deposited Ferromagnetic Chromium Dioxide thin Films for Applications in Spintronics

Dwivedi, Sudhanshu; Jadhav, J.; Sharma, Himanshu; Biswas, Somnath

doi:10.1016/j.phpro.2014.10.037

Cited by 14 publications

(4 citation statements)

References 20 publications

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“…It is known that CrO2 converts naturally into more stable oxide Cr2O3. Being exposed to oxygen or air under normal conditions, CrO2 is usually covered by 2-3 nm layer of Cr2O3 [28] which preserves chromium(IV) from further conversion. Such Cr2O3 layer provides high corrosion resistance to chromium whose efficient oxidation starts only at temperatures of 400-450°C and higher.…”

Section: Experimental Arrangement and Resultsmentioning

confidence: 99%

LIPSS on thin metallic films: New insights from multiplicity of laser-excited electromagnetic modes and efficiency of metal oxidation

Dostovalov

Derrien

Lizunov

et al. 2019

Applied Surface Science

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Thin Cr films 28-nm thick deposited on glass substrates were processed by scanning low-intensity femtosecond laser pulses with energy well below single-pulse damage threshold.Two types of laser-induced periodic surface structures (LIPSS) were produced, depending on the scanning velocity, (1) parallel to laser light polarization with periodicity somewhat smaller than laser wavelength and (2) perpendicular to polarization with spatial period much smaller than wavelength. All structures are formed as protrusions above the initial film surface and exhibit a high degree of oxidation. To explain formation of the LIPSS and their conversion from one to another type, a rigorous numerical approach for modeling surface electromagnetic waves in thin-film geometry has been developed, which takes into account the change of optical properties of material due to laser-induced oxidation and porosity. The approach addresses the multiplicity of electromagnetic modes allowed for thin films. It has been found that the low spatial frequency LIPSS parallel to laser polarization, which are formed at low scanning 2 velocities, are well described by the Sipe theory for surfaces of low roughness. The SEW mode responsible for high spatial frequency LIPSS formation at high scanning velocities has been identified. The mechanisms of optical feedback and transformation between types of LIPSS with scanning velocity have been proposed.3

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Section: Experimental Arrangement and Resultsmentioning

confidence: 99%

LIPSS on thin metallic films: New insights from multiplicity of laser-excited electromagnetic modes and efficiency of metal oxidation

Dostovalov

Derrien

Lizunov

et al. 2019

Applied Surface Science

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“…This minor expansion observed was due to the lower concentration of Cr. Cr–O–Cr represents the weak bending mode at 870 and 1047 cm –1 …”

Section: Resultsmentioning

confidence: 99%

Cr₂O₃–TiO₂-Modified Filter Paper-Based Portable Nanosensors for Optical and Colorimetric Detection of Hydrogen Peroxide

et al. 2021

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In the present approach, a Cr 2 O 3 –TiO 2 -modified, portable, and biomimetic nanosensor was designed to meet the requirement of a robust and colorimetric sensing of hydrogen peroxide. Cr 2 O 3 –TiO 2 nanocomposites prepared via the hydrothermal method were fabricated as a transducer surface on the filter paper using the sol–gel matrix. The color on the filter paper sensor changed from green to blue upon the addition of hydrogen peroxide in the presence of TMB. This change in the color intensity was linear with the concentration of H 2 O 2 . RGB software was used as a color analyzing model to evaluate the optical signals. This paper-based colorimetric platform provided us with an improved analytical figure of merit with a linear range of 0.005–100 μM with 0.003 μM limit of detection. The real sample analysis and excellent anti-interference potential results proved the good analytical performance of the proposed design, providing a more promising tool for colorimetric H 2 O 2 detection. Introducing Cr 2 O 3 –TiO 2 nanocomposite-based paper sensors, being a novel method for optical and colorimetric detection, can pave the way for the development of other sensing devices for the detection of different analytes.

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“…Two shoulder peaks due to symmetric and asymmetric stretching of C-H are visible in all three spectra of nZVI, which can be attributed to ethanol washing of nanoparticles during liquid phase synthesis (Iwasita and Pastor 1994;Yu et al 2007). Two weak bands at 800 cm -1 and 860 cm -1 in spectra of Cr (VI) treated nZVI can be associated with the presence of CrO2 or Cr-O-Cr bending mode (Dwivedi et al 2014;Madi et al 2007).…”

Section: Characterization Of Nzvi Particlesmentioning

confidence: 86%

Impact of Nonaqueous Phase Liquid on Cr(VI) Removal by Nano Zerovalent Iron Particles: Effects of Contact Time, Pollution Load, and pH

Garg

Yadav

Ranjan

et al. 2023

J. Hazard. Toxic Radioact. Waste

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Nanoscale zerovalent iron (nZVI) was synthesized and employed for treating chromium (VI) containing aqueous solution through adsorption using a series of microcosm experiments. The experiments were then performed to study the effects of a light non-aqueous phase liquid (LNAPL), toluene, on Cr (VI) removal by nZVI. Results showed that a maximum removal efficiency of almost 90% was achieved within 300 minutes of the treatment process, while it was suppressed by ~25% in toluene's co-presence. The efficiency was found higher (>80%) at pH 3-7 and reduced to 30.3% at pH 9. No significant change in the removal was observed due to change in pH under toluene's co-presence (57-65% removal for all pH ranges). The removal efficiency also reduced from 62.7% to 37.1% and 82.1 to 28.3% with increase in Cr (VI) concentration (25 to 200 mg/L), with and without co-existing toluene, respectively. Surface morphology and structure of nZVI pre-and post-treatment with Cr (VI) and toluene was analyzed through scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy.The results confirmed the presence of Cr (VI) and toluene on the nZVI surface. The adsorption of Cr (VI) by nZVI was best described by pseudo second order (PSO) kinetics (R 2 = 0.97 in both the cases) and Langmuir isotherm equilibrium model (R 2 = 0.95, 0.81). The maximum adsorption capacity (Qmax) for Cr (VI) without and with toluene was 64.52 mg/g and 58.47 mg/g of the nZVI particles, respectively. Findings from this study provide crucial information about co-contamination and its noticeable effects on remediation of the contaminants of concern.

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Pulsed Laser Deposited Ferromagnetic Chromium Dioxide thin Films for Applications in Spintronics

Cited by 14 publications

References 20 publications

LIPSS on thin metallic films: New insights from multiplicity of laser-excited electromagnetic modes and efficiency of metal oxidation

LIPSS on thin metallic films: New insights from multiplicity of laser-excited electromagnetic modes and efficiency of metal oxidation

Cr₂O₃–TiO₂-Modified Filter Paper-Based Portable Nanosensors for Optical and Colorimetric Detection of Hydrogen Peroxide

Impact of Nonaqueous Phase Liquid on Cr(VI) Removal by Nano Zerovalent Iron Particles: Effects of Contact Time, Pollution Load, and pH

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Pulsed Laser Deposited Ferromagnetic Chromium Dioxide thin Films for Applications in Spintronics

Cited by 14 publications

References 20 publications

LIPSS on thin metallic films: New insights from multiplicity of laser-excited electromagnetic modes and efficiency of metal oxidation

LIPSS on thin metallic films: New insights from multiplicity of laser-excited electromagnetic modes and efficiency of metal oxidation

Cr2O3–TiO2-Modified Filter Paper-Based Portable Nanosensors for Optical and Colorimetric Detection of Hydrogen Peroxide

Impact of Nonaqueous Phase Liquid on Cr(VI) Removal by Nano Zerovalent Iron Particles: Effects of Contact Time, Pollution Load, and pH

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Cr₂O₃–TiO₂-Modified Filter Paper-Based Portable Nanosensors for Optical and Colorimetric Detection of Hydrogen Peroxide