Phase control of chromium oxide in selective microregions by laser annealing

Yu, Ting; Shen, Zexiang; He, Jibao; Sun, W.X.; Tang, Shi-Yu; Jun, Lin

doi:10.1063/1.1558204

Cited by 27 publications

(15 citation statements)

References 18 publications

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“…[12]. TiO 2 as well as Cr 2 O 3 peaks are clearly visible and in good accordance with reports in literature [13][14][15]. Both our synthesized CTO samples and the UCL sample only show bands attributable to a corundum structure: the four E g modes at around 300 cm À1 (weak), 345 cm Figure 3 shows the transmission spectra in the IR range of the four different pellets (Bruker IFS 66).…”

Section: Raman Spectroscopysupporting

confidence: 89%

Preparation, material analysis, and morphology of Cr_2 − xTi_xO_3 + z for gas sensors

Peter

Kneer

Schmitt

et al. 2012

Physica Status Solidi (a)

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Titanium substituted chromium oxide (Cr 2 À x Ti x O 3 þ z , CTO) has gained increasing interest concerning gas sensing applications. CTO is prepared by synthesis of chromium oxide and titanium oxide. Different techniques for verification of successful synthesis of CTO have been investigated. Solid state Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy were performed in addition to the common analysis via X-ray diffraction (XRD). The spectroscopic methods offer a fast, qualitative verification of a complete synthesis. CTO was synthesized in a high temperature sintering step, and powders and dispersions of CTO were prepared. A high energy grinding process leads to the required particle size reduction. The size distribution and crystallite size of the CTO particles were measured. Furthermore morphology and surface coverage analysis on novel type gas-sensing CTO layers, deposited via inkjet technology, were performed and specific adsorption energies of nitrogen dioxide on printed CTO layers were derived. High porosity with sub-micron particles was shown to be characteristic for the layers, resulting in a highly sensitive gas-sensing behavior, with 500 ppb of nitrogen dioxide being clearly detectable.

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Section: Raman Spectroscopysupporting

confidence: 89%

Preparation, material analysis, and morphology of Cr_2 − xTi_xO_3 + z for gas sensors

Peter

Kneer

Schmitt

et al. 2012

Physica Status Solidi (a)

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“…At first glance the spectra appear very different but they are both constituted of two zones with different intensities. The bands in the first zone (200-1000 cm − 1 ) are essentially due to chromium oxides on the surface of the sample [35][36][37] while the bands in the second zone (1000-1800 cm − 1 ) are characteristic of carbon in different environments [38]. In comparison with the new coating (Fig.…”

Section: Chemical Compositionmentioning

confidence: 92%

Chromium carbide growth at low temperature by a highly efficient DLI-MOCVD process in effluent recycling mode

Michau

Maury

Schuster

et al. 2017

Surface and Coatings Technology

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. The effect of direct recycling of effluents on the quality of Cr x C y coatings grown by MOCVD using direct liquid injection (DLI) of bis(ethylbenzene)chromium(0) in toluene was investigated. The results are compared with those obtained using non-recycled solutions of precursor. Both types of coatings exhibit the same features. They are amorphous in the temperature range 673-823 K. They exhibit a dense and glassy-like microstructure and a high hardness (> 23 GPa). Analyses at the nanoscale revealed a nanocomposite microstructure consisting of free-C domains embedded in an amorphous Cr 7 C 3 matrix characterized by strong interfaces and leading to an overall composition slightly higher than Cr 7 C 3 . The stiffness and strength of these interfaces are mainly due to at least two types of chemical bonds between Cr atoms and free-C: (i) Cr intercalation between graphene sheets and (ii) hexahapto η 6 -Cr bonding on the external graphene sheets of the free-C domains. The density of these interactions was found increasing by decreasing the concentration of the injected solution, as this occurred using a recycled solution. As a result, "recycled" coatings exhibit a higher nanohardness (29 GPa) than "new" coatings (23 GPa). This work demonstrates that using bis(arene)M(0) precursors, direct recycling of effluents is an efficient route to improve the conversion yield of DLI-MOCVD process making it cost-effective and competitive to produce protective carbide coatings of transition metals which share the same metal zero chemistry.

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“…10 These high laser powers were required because the black color and half-metallic nature of the material made the Raman scattered signal very weak. A lower laser power can be used in such a system, however the long collection times would reduce the density of data points and increase the error in pressure measurement as some cell relaxation occurs during the course of a measurement.…”

Section: Methodsmentioning

confidence: 99%

High-pressure structure of half-metallicCrO2

et al. 2006

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Evidence for a structural phase transition from rutile α-CrO 2 phase I (P4 2 /mnm) to orthorhombic β-CrO 2 phase II (CaCl 2 -like, Pnnm) is presented using angle-resolved synchrotron x-ray diffraction and high sensitivity confocal Raman spectroscopy. The transition to the CaCl 2 structure, which appears to be second-order, occurs at 3 12 ± GPa without any measurable discontinuity in volume, but is accompanied by an apparent increase in compressibility. Raman data are also presented to show further evidence for a second-order structural phase transition as well to demonstrate soft-mode behavior of the B 1g phonon mode.

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Phase control of chromium oxide in selective microregions by laser annealing

Cited by 27 publications

References 18 publications

Preparation, material analysis, and morphology of Cr_2 − xTi_xO_3 + z for gas sensors

Preparation, material analysis, and morphology of Cr_2 − xTi_xO_3 + z for gas sensors

Chromium carbide growth at low temperature by a highly efficient DLI-MOCVD process in effluent recycling mode

High-pressure structure of half-metallicCrO2

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Phase control of chromium oxide in selective microregions by laser annealing

Cited by 27 publications

References 18 publications

Preparation, material analysis, and morphology of Cr2 − xTixO3 + z for gas sensors

Preparation, material analysis, and morphology of Cr2 − xTixO3 + z for gas sensors

Chromium carbide growth at low temperature by a highly efficient DLI-MOCVD process in effluent recycling mode

High-pressure structure of half-metallicCrO2

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Preparation, material analysis, and morphology of Cr_2 − xTi_xO_3 + z for gas sensors

Preparation, material analysis, and morphology of Cr_2 − xTi_xO_3 + z for gas sensors