Effect of magnetic and electric coupling fields on micro- and nano- structure of carbon films in the CVD diamond process and their electron field emission property

Wang, Yijia; Li, Jiaxin; Hu, Naixiu; Jiang, Yongfeng; Wei, Qiuping; Yu, Zhaoju; Long, Hangyu; Zhu, Hecheng; Xie, Youneng; Ma, Li; Lin, Cheng‐Te; Su, Weitao

doi:10.1088/2053-1591/aab11b

Cited by 8 publications

(8 citation statements)

References 53 publications

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“…Using the same parameters and applying an external magnetic field (perpendicular to substrate, 500 mT) promoted densification of grains (cross-sectional analysis shows a thickness of 89 nm, Figure d–f) and homogeneous crystal size distribution. Comparable effects were reported for diamond coatings, formed in the presence of external magnetic fields. , SAED analysis confirmed the formation of ReN (Figure S21). Furthermore, preferred growth direction ⟨100⟩ along 200 plane was observed, while growth along ⟨111⟩ direction that is generally the preferred growth axis in fcc structure was inhibited.…”

Section: Resultssupporting

confidence: 74%

Volatile Rhenium(I) Compounds with Re–N Bonds and Their Conversion into Oriented Rhenium Nitride Films by Magnetic Field-Assisted Vapor Phase Deposition

et al. 2019

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New heteroleptic rhenium(I) compounds, [fac-Re(I)(CO)3(L)] (e.g., L= tfb-dmpda, (N,N-(4,4,4-trifluorobut-1-en-3-on)-dimethyl propylene diamine)), containing anionic and neutral ligands act as efficient precursors to grow polycrystalline rhenium nitride (ReN) films by their vapor phase deposition at 600 °C. Deposition of ReN films under an external magnetic field showed an orientation effect with preferred growth of crystallites along ⟨100⟩ direction. Rhenium complexes reported here unify high stability and reactivity in a single molecule through a Janus-type coordination around a Re center, constituted by a chelating tridentate ligand and three carbonyl groups imparting a facial geometry. Single-crystal diffraction analysis confirmed the structural integrity of the new rhenium compounds. The rigidity of molecular framework was validated in solution via 1D and 2D NMR spectroscopy, in the gas phase via mass spectrometry, and in the solid-state by thermogravimetric analysis and differential scanning calorimetry studies. The analytical data showed that pre-existent Re–N bonds in [fac-Re(I)(CO)3(L)] facilitated low-temperature formation of crystalline ReN deposits confirmed by grazing angle X-ray diffraction analysis. The surface chemical composition and the uniformity of microstructure were provided by X-ray photoelectron spectroscopy (XPS) and scanning and transmission electron microscopy (SEM/TEM), respectively.

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Section: Resultssupporting

confidence: 74%

Volatile Rhenium(I) Compounds with Re–N Bonds and Their Conversion into Oriented Rhenium Nitride Films by Magnetic Field-Assisted Vapor Phase Deposition

et al. 2019

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“… 9 Similarly, application of magnetic fields was shown to promote crystal growth during CVD of diamond films. 12,13 Recently, Wang et al reported on the magnetic and electrical field effects in the CVD of diamond films, when thinner coatings with preferred orientation were obtained during the field-assisted processes. 12 …”

Section: Introductionmentioning

confidence: 99%

Anisotropy control in magnetic nanostructures through field-assisted chemical vapor deposition

et al. 2019

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Chemical vapor deposition of iron pentacarbonyl (Fe(CO) 5 ) in an external magnetic field (B ¼ 1.00 T) was found to significantly affect the microstructure and anisotropy of as-deposited iron crystallites that could be transformed into anisotropic hematite (a-Fe 2 O 3 ) nanorods by aerobic oxidation. The deterministic influence of external magnetic fields on CVD deposits was found to be substrateindependent as demonstrated by the growth of anisotropic a-Fe columns on FTO (F:SnO 2 ) and Si (100), whereas the films deposited in the absence of the magnetic field were constituted by isotropic grains.TEM images revealed gradual increase in average crystallite size in correlation to the increasing field strength and orientation, which indicates the potential of magnetic field-assisted chemical vapor deposition (mfCVD) in controlling the texture of the CVD grown thin films. Given the facet-dependent activity of hematite in forming surface-oxygenated intermediates, exposure of crystalline facets and planes with high atomic density and electron mobilities is crucial for oxygen evolution reactions. The field-induced anisotropy in iron nanocolumns acting as templates for growing textured hematite pillars resulted in two-fold higher photoelectrochemical efficiency for hematite films grown under external magnetic fields (J ¼ 0.050 mA cm À2 ), when compared to films grown in zero field (J ¼ 0.027 mA cm À2 ). The dark current measurements indicated faster surface kinetics as the origin of the increased catalytic activity.

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“…In this context, field-assisted CVD offers an independent synthetic parameter to influence thin film properties through alteration of atomistic processes, potentially influencing grain growth and densification behavior of resultant films. Previous studies have reported on the positive influence of external magnetic fields on the crystallinity and growth kinetics of diamond coatings. − Further, an aligned growth of carbon nanotubes (CNTs) was observed when an external magnetic field was applied during the CVD process, probably due to the field-influenced elongation of transition metal clusters used as catalysts. − Moreover, enhanced piezoelectric properties in GaN nanowires grown under magnetic field influence were attributed to an increased structural anisotropy …”

mentioning

confidence: 99%

Magnetic Field-Assisted Chemical Vapor Deposition of Iron Oxide Thin Films: Influence of Field–Matter Interactions on Phase Composition and Morphology

Stadler

Mueller

Brede

et al. 2019

J. Phys. Chem. Lett.

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Magnetic field-assisted CVD offers a direct pathway to manipulate the evolution of microstructure, phase composition, and magnetic properties of the asprepared film. We report on the role of applied magnetic fields (0.5 T) during a cold-wall CVD deposition of iron oxide from [Fe III (O t Bu) 3 ] 2 leading to higher crystallinity, larger particulates, and better out-of-plane magnetic anisotropy, if compared with zero-field depositions. Whereas selective formation of homogeneous magnetite films was observed for the field-assisted process, coexistence of hematite and amorphous iron(III) oxide was confirmed under zero-field conditions. Comparison of the coercive field (11 vs 60 mT) indicated lower defect concentration for the field-assisted process with nearly superparamagnetic behavior. X-ray photoemission electron microscopy (X-PEEM) in absorption mode at the O-K and Fe-L 3,2 edges confirmed the selective formation of magnetite (field-assisted) and hematite (zero-field) with coexisting amorphous phases, respectively, emphasizing the importance of field−matter interactions in the phase-selective synthesis of magnetic thin films.

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Effect of magnetic and electric coupling fields on micro- and nano- structure of carbon films in the CVD diamond process and their electron field emission property

Cited by 8 publications

References 53 publications

Volatile Rhenium(I) Compounds with Re–N Bonds and Their Conversion into Oriented Rhenium Nitride Films by Magnetic Field-Assisted Vapor Phase Deposition

Volatile Rhenium(I) Compounds with Re–N Bonds and Their Conversion into Oriented Rhenium Nitride Films by Magnetic Field-Assisted Vapor Phase Deposition

Anisotropy control in magnetic nanostructures through field-assisted chemical vapor deposition

Magnetic Field-Assisted Chemical Vapor Deposition of Iron Oxide Thin Films: Influence of Field–Matter Interactions on Phase Composition and Morphology

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