Characterization of an amorphous carbon film covering a Mo grid during in situ heating TEM study

Yoo, Seung Jo; Kim, C.-Y.; Shin, Jae Won; Lee, S.-G.; Jeong, Jun-Ho; Kim, Y.-J.; Lee, S.-H.; Kim, J.-G.

doi:10.1016/j.matchar.2013.01.011

Cited by 15 publications

(10 citation statements)

References 24 publications

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“…For α-Mo 2 C and β-Mo 2 C, we find that the facets with the largest area in our Wulff construction are consistent with those commonly observed. These phases are reported as being roughly spherical in shape, 9,88 in qualitative agreement with our Wulff shapes. The (011)-C facet has the largest area fraction for β-Mo 2 C, consistent with calculations from Han et al; 77 however our Wulff shape for β-Mo 2 C is not identical to theirs because of our inclusion of Miller index 2 and higher facets.…”

Section: Methodssupporting

confidence: 89%

Nanoparticle Size Effects on Phase Stability for Molybdenum and Tungsten Carbides

et al. 2021

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Transition-metal carbides (TMCs) are important materials for a variety of applications and industrial processes, in part because of their variable crystal structures and surfaces. However, the synthesis of TMCs often proceeds through metastable phases during particle growth, the appearance of which cannot be described by traditional phase diagrams. Here, we use density functional theory calculations and thermodynamic analyses to construct particle size-dependent phase diagrams for Mo and W carbides and reveal the relationships between phase stability and TMC nanoparticle size. We compute size-dependent phase diagrams for a wide range of Mo carbide and W carbide phases, determine predicted crystallization pathways during synthesis, and compare model results with experimental data. We provide insights for the influence of nanoparticle size on TMC nucleation and growth during synthesis and provide a computationally guided road map for navigating the synthesis of target TMC surfaces and phases.

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Section: Methodssupporting

confidence: 89%

Nanoparticle Size Effects on Phase Stability for Molybdenum and Tungsten Carbides

et al. 2021

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“…Transmission electron microscopy (TEM) and Raman spectra of carbon films coated under ECR low-energy electron irradiation at V dep = 20 V, 50 V, and 80 V are shown in Figure 2a–c. The red and green boxes in Figure 2a–c mark the areas with and without GN, respectively, and the insets are their fast Fourier transform (FFT) images [28,29]. The FFT images demonstrate that inside the GN two Laue spots appear, corresponding to the (0001)* facet of the multilayer graphene [30].…”

Section: Resultsmentioning

confidence: 99%

Bias-Modulated High Photoelectric Response of Graphene-Nanocrystallite Embedded Carbon Film Coated on n-Silicon

et al. 2019

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We propose that bias-modulated graphene-nanocrystallites (GNs) grown vertically can enhance the photoelectric property of carbon film coated on n-Si substrate. In this work, GN-embedded carbon (GNEC) films were deposited by the electron cyclotron resonance (ECR) sputtering technique. Under a reverse diode bias which lifts the Dirac point of GNs to a higher value, the GNEC film/n-Si device achieved a high photocurrent responsivity of 0.35 A/W. The bias-modulated position of the Dirac point resulted in a tunable ON/OFF ratio and a variable spectral response peak. Moreover, due to the standing structured GNs keeping the transport channels, a response time of 2.2 μs was achieved. This work sheds light on the bias-control wavelength-sensitive photodetector applications.

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“…This process of crystal structure change could be caused by the evaporation of O and Zn atoms in the Mg x Zn 1 − x O alloy system under the high vacuum condition of the specimen chamber of an HVEM [30,31]. While no O evaporation is expected in O 2 atmosphere since the O 2 partial pressure in the ambient is well above the O 2 vapor pressure of ZnO, the concentration of O vacancy could increase in O poor annealing conditions such as a vacuum annealing [32].…”

Section: Discussionmentioning

confidence: 99%

Direct observation of the crystal structure changes in the Mg Zn O alloy system

et al. 2015

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Characterization of an amorphous carbon film covering a Mo grid during in situ heating TEM study

Cited by 15 publications

References 24 publications

Nanoparticle Size Effects on Phase Stability for Molybdenum and Tungsten Carbides

Nanoparticle Size Effects on Phase Stability for Molybdenum and Tungsten Carbides

Bias-Modulated High Photoelectric Response of Graphene-Nanocrystallite Embedded Carbon Film Coated on n-Silicon

Direct observation of the crystal structure changes in the Mg Zn O alloy system

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