A comparative study of Mg and Pt contacts on semi-insulating GaAs: Electrical and XPS characterization

Dubecký, F.; Kindl, D.; Hubík, P.; Mičušík, Matej; Dubecký, Matúš; Boháček, P.; Vanko, G.; Gombia, E.; Nečas, Vladimı́r; Mudroň, J.

doi:10.1016/j.apsusc.2016.04.176

Cited by 19 publications

(8 citation statements)

References 16 publications

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“…The results in Figure 6a show the Mg 1s spectrum for the MTO1 and MTO2 films at a lower energy (~1303.6 eV) than that recorded for the MTO3 films, which display a shift to a higher energy (~1303.8 eV) most likely due to the oxidation of Mg [30,34]. The Mg KLL Auger spectrum (Figure 6b [35,36]. These results are in line with the MgO diffractions identified by XRD ( Figure 2).…”

Section: Films Analysis and Characterizationsupporting

confidence: 74%

Influence of Mg Doping Levels on the Sensing Properties of SnO2 Films

Bendahmane

Tomić

Touidjen

et al. 2020

Sensors

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This work presents the effect of magnesium (Mg) doping on the sensing properties of tin dioxide (SnO2) thin films. Mg-doped SnO2 films were prepared via a spray pyrolysis method using three doping concentrations (0.8 at.%, 1.2 at.%, and 1.6 at.%) and the sensing responses were obtained at a comparatively low operating temperature (160 °C) compared to other gas sensitive materials in the literature. The morphological, structural and chemical composition analysis of the doped films show local lattice disorders and a proportional decrease in the average crystallite size as the Mg-doping level increases. These results also indicate an excess of Mg (in the samples prepared with 1.6 at.% of magnesium) which causes the formation of a secondary magnesium oxide phase. The films are tested towards three volatile organic compounds (VOCs), including ethanol, acetone, and toluene. The gas sensing tests show an enhancement of the sensing properties to these vapors as the Mg-doping level rises. This improvement is particularly observed for ethanol and, thus, the gas sensing analysis is focused on this analyte. Results to 80 ppm of ethanol, for instance, show that the response of the 1.6 at.% Mg-doped SnO2 film is four times higher and 90 s faster than that of the 0.8 at.% Mg-doped SnO2 film. This enhancement is attributed to the Mg-incorporation into the SnO2 cell and to the formation of MgO within the film. These two factors maximize the electrical resistance change in the gas adsorption stage, and thus, raise ethanol sensitivity.

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Section: Films Analysis and Characterizationsupporting

confidence: 74%

Influence of Mg Doping Levels on the Sensing Properties of SnO2 Films

Bendahmane

Tomić

Touidjen

et al. 2020

Sensors

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“…Figure 10 shows the Mg KLL Auger spectrum which obtained from the matrix surface before and after sliding friction. The Mg 1s peak often shows Auger peaks at 300-390 eV [20,21], where the principal Mg KLL Auger peak (binding energy 300-306 eV) has a chemical shift [22]. Figure 10b shows data for, the initial Mg surface, where the main Auger peak of the native Mg oxide was around 306.9 eV [23] and the Auger KLL peak of the Mg metal was at 302.28 eV [23]; this deference between these two peaks is 4.7 eV.…”

Section: Xpsmentioning

confidence: 99%

Tribochemical Behavior of Pure Magnesium During Sliding Friction

Zhuang

Peng

Wang

et al. 2019

Metals

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Reciprocating sliding friction tests were conducted on pure magnesium using a UMT-II tester. The tribo-chemical behavior was characterized using X-ray photoelectron spectroscopy (XPS) and electron probe micro-analyzer (EPMA), which showed that the tribo-chemical behavior of pure magnesium was due to a tribo-oxidation reaction. At room temperature, the debris layer on the worn surface contained Mg(OH)2, MgO, and MgCO3. According to the reciprocating sliding friction mechanism, the decomposition of MgCO3 into MgO should occur. XPS results revealed that the surface oxide layer, containing Mg(OH)2, and MgO, acted as a third layer to protect the surface. Apparently, Mg(OH)2·nH2O was the main tribo-chemical product of pure magnesium under sliding friction.

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“…In the case of O 1s spectra shown in Figure , the peaks at 529.2, 529.3, and 531.0 eV belong to lattice oxygen species, and the peaks at 531.3, 531.3, and 531.5 eV can be attributed to chemisorbed oxygen species, such as O 2– , O 2 2– , and O – . It should be noted that the electrophilic chemisorbed oxygen species play a vital role in deep oxidation of organics .…”

Section: Resultsmentioning

confidence: 90%

“…11 In the case of O 1s spectra shown in Figure 3, the peaks at 529.2, 529.3, and 531.0 eV belong to lattice oxygen species, and the peaks at 531.3, 531.3, and 531.5 eV can be attributed to chemisorbed oxygen species, such as O 2− , O 2 2− , and O − . 31 It should be noted that the electrophilic chemisorbed oxygen species play a vital role in deep oxidation of organics. 32 It can be seen from the spectrum of O 1s in MgO and CoO x /MgO and Table S3 that when Co was doped with MgO, the ratio of adsorbed oxygen to lattice oxygen increased obviously, which was one of the main reasons for the improvement of catalytic activity.…”

Section: Surface Chemical States Of Catalystsmentioning

confidence: 94%

Efficient Treatment of Phenol Wastewater by Catalytic Ozonation over Micron-Sized Hollow MgO Rods

Zhang

Zhou

et al. 2021

ACS Omega

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Phenol is a nocuous water pollutant that threatens human health and the ecological environment. CoOx-doped micron-sized hollow MgO rods were prepared for the treatment of phenol wastewater by catalytic ozonation. Magnesium sources, precipitants, initial precursor concentration, Co/Mg molar ratio, and catalyst calcination temperature were optimized to obtain the best catalysts. Prepared catalysts were also well characterized by various methods to analyze their structure and physical and chemical properties. In this process, CoOx/MgO with the largest large surface area (151.3 m3/g) showed the best catalytic performance (100 and 79.8% of phenol and chemical oxygen demand (COD) removal ratio, respectively). The hydrolysis of CoOx/MgO plays a positive role in the degradation of phenol. The catalytic mechanism of the degradation of O3 to free radicals over catalysts has been investigated by in situ electronic paramagnetic resonance (EPR). The catalyst can be reused at least five times without any activity decline. The prepared CoOx/MgO catalyst also showed excellent catalytic performance for removal and degradation of ciprofloxacin, norfloxacin, and salicylic acid.

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A comparative study of Mg and Pt contacts on semi-insulating GaAs: Electrical and XPS characterization

Cited by 19 publications

References 16 publications

Influence of Mg Doping Levels on the Sensing Properties of SnO2 Films

Influence of Mg Doping Levels on the Sensing Properties of SnO2 Films

Tribochemical Behavior of Pure Magnesium During Sliding Friction

Efficient Treatment of Phenol Wastewater by Catalytic Ozonation over Micron-Sized Hollow MgO Rods

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