Electron Spin Resonance Study of Mn-doped Metal Oxides Annealed at Different Temperatures

Phan, Long; Zhang, P.; Tran, H. D.; Yu, Seong‐Cho

doi:10.3938/jkps.57.1270

Cited by 16 publications

(6 citation statements)

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“…1 and 2 whereby the manganese species that exists in this catalyst were MnO 2 (Mn 4+ ). This result is similar to Phan et al [29] who identified that MnO 2 will exhibit a symmetrical center which is caused by a paramagnetic property at a magnetic field about 300 mT. It can be clearly seen in XRD diffractograms that the presence of MnO 2 peaks in the catalyst calcined at 1000 and above.…”

Section: Electron Spin Resonance (Esr) Analysissupporting

confidence: 89%

Optimization and physicochemical studies of alumina supported samarium oxide based catalysts using artificial neural network in methanation reaction

Rosid

Azid

Ahmad

et al. 2022

Environmental Engineering Research

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Developed countries are increasing their demand for natural gas as it is an industrial requirement for fuel transportation. Most of modern society relies heavily on vehicles. However, the presence of CO2 gas has led to the categorization of sour natural gas which reduces the quality and price of natural gas. Therefore, the catalytic methanation technique was applied to convert carbon dioxide (CO2) to methane (CH4) gas and reduce the emissions of CO2 within the environment. In this study, samarium oxide supported on alumina doped with ruthenium and manganese was synthesized via wet impregnation. X-ray diffraction (XRD) analysis revealed samarium oxide, Sm2O3 and manganese oxide, MnO2 as an active species. The reduction temperature for active species was at a low reaction temperature, 268.2 o C with medium basicity site as in Temperature Programme Reduction (TPR) and Temperature Programme Desorption (TPD) analyses. Field Emission Scanning Electron Microscopy (FESEM) analysis showed an agglomeration of particle size. The characterised potential catalyst of Ru/Mn/Sm (5:35:60)/Al2O3 (RMS 5:35:60) calcined at 1,000 o C revealed 100% conversion of CO2 with 68.87% CH4 formation at the reaction temperature of 400 o C. These results were verified by artificial neural network (ANN) with validation R 2 of 0.99 indicating all modelling data are acceptable.

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Section: Electron Spin Resonance (Esr) Analysissupporting

confidence: 89%

Optimization and physicochemical studies of alumina supported samarium oxide based catalysts using artificial neural network in methanation reaction

Rosid

Azid

Ahmad

et al. 2022

Environmental Engineering Research

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“…The six hyperfine lines are likely to be caused only by (m s =-1/2, m s =1/2) transitions. All the other transitions are not observed due to their strongly anisotropic character [47], which makes them invisible for a sample in powder form. Assuming a Mn 2+ concentration of about 0.2% (as estimated for a nominally identical sample in Ref.…”

Section: mentioning

confidence: 99%

Single-chip electron spin resonance detectors operating at 50 GHz, 92 GHz, and 146 GHz

Matheoud

Gualco

Jeong

et al. 2017

Journal of Magnetic Resonance

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We report on the design and characterization of single-chip electron spin resonance (ESR) detectors operating at 50GHz, 92GHz, and 146GHz. The core of the single-chip ESR detectors is an integrated LC-oscillator, formed by a single turn aluminum planar coil, a metal-oxide-metal capacitor, and two metal-oxide semiconductor field effect transistors used as negative resistance network. On the same chip, a second, nominally identical, LC-oscillator together with a mixer and an output buffer are also integrated. Thanks to the slightly asymmetric capacitance of the mixer inputs, a signal at a few hundreds of MHz is obtained at the output of the mixer. The mixer is used for frequency down-conversion, with the aim to obtain an output signal at a frequency easily manageable off-chip. The coil diameters are 120μm, 70μm, and 45μm for the U-band, W-band, and the D-band oscillators, respectively. The experimental frequency noises at 100kHz offset from the carrier are 90Hz/Hz, 300Hz/Hz, and 700Hz/Hz at 300K, respectively. The ESR spectra are obtained by measuring the frequency variations of the single-chip oscillators as a function of the applied magnetic field. The experimental spin sensitivities, as measured with a sample of α,γ-bisdiphenylene-β-phenylallyl (BDPA)/benzene complex, are 1×10spins/Hz, 4×10spins/Hz, 2×10spins/Hz at 300K, respectively. We also show the possibility to perform experiments up to 360GHz by means of the higher harmonics in the microwave field produced by the integrated single-chip LC-oscillators.

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“…Золото среди других благородных металлов является очень эффективной добавкой для активации чувствительности TiO 2 к видимому свету и тем самым улучшает эффективность фотокатализаторов TiO 2 [18]. Уровень Ферми наночастиц Au ниже, чем в TiO 2 , что приводит к эффективному переносу фотогенерированных электронов из зоны проводимости TiO 2 к частицам металла [24] и, как результат, к более высокой фотокаталитической активности, например при фотокаталитическом расщеплении смеси вода-этанол [25], за счет снижения скорости рекомбинации пар электрон-дырка [24,26]. Сделан вывод о том, что фоточувствительность TiO 2 в данном случае обусловлена вкладом поверхностного плазмонного резонанса, опосредованного локальным электромагнитным полем наночастиц Au [2,22,23,27].…”

Section: Introductionunclassified

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2021

EOM

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Electron Spin Resonance Study of Mn-doped Metal Oxides Annealed at Different Temperatures

Cited by 16 publications

References 0 publications

Optimization and physicochemical studies of alumina supported samarium oxide based catalysts using artificial neural network in methanation reaction

Optimization and physicochemical studies of alumina supported samarium oxide based catalysts using artificial neural network in methanation reaction

Single-chip electron spin resonance detectors operating at 50 GHz, 92 GHz, and 146 GHz

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