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Two-dimensional mapping of the electric field distribution inside vacuum microgaps observed in a scanning electron microscope. EI PubMed Scopus SCIE
期刊论文 | 2019 , 116 , 93-99 | Micron
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Abstract :

In this paper, we present an in-situ measurement method to directly observe the distribution of the local electric field between vacuum microgaps. The measurement was performed in-situ inside a high resolution scanning electron microscope (SEM), and the nature of the local electric field was characterized through secondary electron contrast images with the aid of Rutherford scattering theory. Based on the regular fringes in these contrast images, the distribution of the local electric field could be extracted from the contour lines of the fringes while the magnitude of the local electric field could be evaluated qualitatively by the gradient of the contour lines. The finite element method (FEM) simulation and the three-electrodes imaging experiment were also conducted, and the obtained two-dimensional electric field distribution agreed well with the FEM simulation, suggesting that the in-situ visualization technique could be useful for determining the local field enhancement behavior for various geometrical configurations and microscale structures. A physical mechanism for the local electric field mapping is suggested. This study demonstrates the potential of SEM imaging for obtaining information about the local electric field within microelectronic structures and devices.

Keyword :

Electric field distribution Two-dimensional mapping Rutherford scattering Scanning electron microscope

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GB/T 7714 Meng Guodong , Dong Chengye , Gao Xinyu et al. Two-dimensional mapping of the electric field distribution inside vacuum microgaps observed in a scanning electron microscope. [J]. | Micron , 2019 , 116 : 93-99 .
MLA Meng Guodong et al. "Two-dimensional mapping of the electric field distribution inside vacuum microgaps observed in a scanning electron microscope." . | Micron 116 (2019) : 93-99 .
APA Meng Guodong , Dong Chengye , Gao Xinyu , Zhang Dujiao , Wang Kejing , Zhang Pengcheng et al. Two-dimensional mapping of the electric field distribution inside vacuum microgaps observed in a scanning electron microscope. . | Micron , 2019 , 116 , 93-99 .
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Spatio-temporal dynamics of pulsed gas breakdown in microgaps SCIE
期刊论文 | 2019 , 26 (1) , 6 | PHYSICS OF PLASMAS
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Microscale gas breakdown plays a critical role in microplasma generation for numerous applications and device lifetime for miniaturized electronics. This communication extends a previous investigation of pulsed breakdown morphology [G. Meng et al., Phys. Plasmas 25, 082116 (2018)] by providing further insight into the spatio-temporal dynamics of pulsed gas breakdown for different gap distances using an in-situ electrical-optical measurement method. Time-resolved sequential images and the corresponding photon number distributions are obtained to demonstrate the dynamic evolution of the breakdown channel morphology and the ionization intensity during breakdown development. For a 15 mu m gap, breakdown transitions from a spot area on both electrode surfaces to a broad discharge region comprised of filamentary main breakdown channel (similar to 2.00 mu m) and surrounding weak ionization area due to the local field enhancement. For a 2 mu m gap, it transitions from a thin channel (similar to 1.09 mu m) to a wider and uniform channel (similar to 2.14 mu m) because the electric field is more uniform at smaller gaps. Interestingly, the main breakdown channel width at the instant of breakdown is independent of the gap width. For the 2 mu m gap, field emission dominates the initial stage of breakdown and collision ionization (alpha process) dominates during breakdown development, while the Townsend avalanche dominates the breakdown process for the 15 mu m gap. We apply a simple asymptotic theory to quantify the relative contribution of these phenomena and predict that breakdown will follow Paschen's law for gaps larger than 17.8 mu m. Published under license by AIP Publishing.

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GB/T 7714 Meng, Guodong , Ying, Qi , Loveless, Amanda M. et al. Spatio-temporal dynamics of pulsed gas breakdown in microgaps [J]. | PHYSICS OF PLASMAS , 2019 , 26 (1) : 6 .
MLA Meng, Guodong et al. "Spatio-temporal dynamics of pulsed gas breakdown in microgaps" . | PHYSICS OF PLASMAS 26 . 1 (2019) : 6 .
APA Meng, Guodong , Ying, Qi , Loveless, Amanda M. , Wu, Feihong , Wang, Kejing , Fu, Yangyang et al. Spatio-temporal dynamics of pulsed gas breakdown in microgaps . | PHYSICS OF PLASMAS , 2019 , 26 (1) , 6 .
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A Facile Path to Graphene-Wrapped Polydopamine-Entwined Silicon Nanoparticles with High Electrochemical Performance SCIE
期刊论文 | 2019 , 84 (2) , 203-209 | CHEMPLUSCHEM
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Abstract :

Graphene-coated silicon nanoparticles with polydopamine buffers have been designed and successfully fabricated as anodes for lithium ion batteries, where the polydopamine was grown on the silicon nanoparticles and then coated with graphene layers. The expansion cavities for silicon nanoparticles during charging and discharging process are provided by the polydopamine buffer layers. The outermost graphene coating layers not only keep the pulverized silicon particles together without disintegration, but also improve the electric conductivity of silicon nanoparticles. Silicon nanoparticles of an industrial product level with different size distributions and oxidation layers were used in this work. High electrochemical performances with specific capacities of 1100 mAh g(-1) were achieved by the designed silicon composites with polydopamine and graphene after 550 cycles at a current rate of 200 mA g(-1).

Keyword :

silicon nanoparticles graphene Li-ion batteries mechanical methods polydopamine

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GB/T 7714 Liu, Zechen , Huang, Jialiang , Zhao, Xuewen et al. A Facile Path to Graphene-Wrapped Polydopamine-Entwined Silicon Nanoparticles with High Electrochemical Performance [J]. | CHEMPLUSCHEM , 2019 , 84 (2) : 203-209 .
MLA Liu, Zechen et al. "A Facile Path to Graphene-Wrapped Polydopamine-Entwined Silicon Nanoparticles with High Electrochemical Performance" . | CHEMPLUSCHEM 84 . 2 (2019) : 203-209 .
APA Liu, Zechen , Huang, Jialiang , Zhao, Xuewen , Huang, Hongyang , Fu, Chengcheng , Li, Zhihui et al. A Facile Path to Graphene-Wrapped Polydopamine-Entwined Silicon Nanoparticles with High Electrochemical Performance . | CHEMPLUSCHEM , 2019 , 84 (2) , 203-209 .
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FeSx-graphene heterostructures: Nanofabrication-compatible catalysts for ultra-sensitive electrochemical detection of hydrogen peroxide SCIE
期刊论文 | 2019 , 285 , 631-638 | SENSORS AND ACTUATORS B-CHEMICAL
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Hydrogen peroxide (H2O2) is one of the most important redox-active metabolites in biological processes, from cell signaling to oxidative stress. Incorporation of catalytic nano-phase heterostructures can significantly improve the detection limit of H2O2 electrochemical sensors. Here, we report an iron sulfide (FeSx)/graphene heterostructure for detection of H2O2 down to similar to 500 picoMolar (pM), with a dynamic range over six orders of magnitude. By relying on the Fenton reaction, the developed catalyst enables selective detection of H2O2 vs. common redox-active metabolites in physiological condition. Electrochemical analysis reveals a strong substrate-dependent performance, where the type and doping of the graphene layer dramatically impact sensitivity. Specifically, for the first time, the electrochemical performance of chemical vapor deposited versus epitaxial graphene (EG) layers is examined and compared in a systematic way. The results demonstrate that a heterostructure of FeSx with chemical vapor deposited graphene (CVD-G) exhibits the highest reduction in charge transfer resistance (more than 16x), leading to a significantly higher sensitivity compared to n-doped and p-doped EG. Furthermore, the excellent sensitivity and material stability of the developed heterostructures enable in situ detection of redox changes due to heat shock-induced oxidative stress on E. coli cells. Since the developed heterostructures are directly-grown, they can be patterned with nanometer-scale resolution. Hence, this work can open up new possibilities for developing ultracompact devices for monitoring redox changes in situ, with high spatial resolution.

Keyword :

Iron sulfide Fenton reaction Graphene Electrochemical sensing Hydrogen peroxide Heterostructure

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GB/T 7714 Ebrahimi, Aida , Zhang, Kehao , Dong, Chengye et al. FeSx-graphene heterostructures: Nanofabrication-compatible catalysts for ultra-sensitive electrochemical detection of hydrogen peroxide [J]. | SENSORS AND ACTUATORS B-CHEMICAL , 2019 , 285 : 631-638 .
MLA Ebrahimi, Aida et al. "FeSx-graphene heterostructures: Nanofabrication-compatible catalysts for ultra-sensitive electrochemical detection of hydrogen peroxide" . | SENSORS AND ACTUATORS B-CHEMICAL 285 (2019) : 631-638 .
APA Ebrahimi, Aida , Zhang, Kehao , Dong, Chengye , Subramanian, Shruti , Butler, Derrick , Bolotsky, Adam et al. FeSx-graphene heterostructures: Nanofabrication-compatible catalysts for ultra-sensitive electrochemical detection of hydrogen peroxide . | SENSORS AND ACTUATORS B-CHEMICAL , 2019 , 285 , 631-638 .
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Dielectric properties and thermal conductivity of epoxy composites using quantum-sized silver decorated core/shell structured alumina/polydopamine SCIE
期刊论文 | 2019 , 118 , 302-311 | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
WoS CC Cited Count: 6
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Abstract :

We report the preparation of epoxy-based composites with enhanced dielectric properties and thermal conductivity, by employing intelligently designed core/shell Alumina/Polydopamine (indicated as AO*) and strawberry-like core/shell structured Alumina/Polydopamine/Silver (indicated as AO*@Ag) particles as fillers. The introduction of the core-shell AO* and AO*@Ag particles into the epoxy matrix can distinctly enhance both the dielectric permittivity and dielectric breakdown strength of composites, as compared to that incorporating AO particles as fillers. For example, the dielectric breakdown strength of AO*@Ag/epoxy with 22.9 vol% filler loading is up to 65.5 kV/mm, representing an improvement of 24% compared with AO/epoxy composite at the same filler loading (52.8 kV/mm), while it has enhanced dielectric permittivity at room temperature at low frequency. Additionally, the strawberry-like core/shell particle-filled composites still take on a high thermal conductivity.

Keyword :

Dielectric properties Thermal conductivity Epoxy composites Surface treatments Alumina particles

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GB/T 7714 Wang, Zhengdong , Yang, Mengmeng , Cheng, Yonghong et al. Dielectric properties and thermal conductivity of epoxy composites using quantum-sized silver decorated core/shell structured alumina/polydopamine [J]. | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING , 2019 , 118 : 302-311 .
MLA Wang, Zhengdong et al. "Dielectric properties and thermal conductivity of epoxy composites using quantum-sized silver decorated core/shell structured alumina/polydopamine" . | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING 118 (2019) : 302-311 .
APA Wang, Zhengdong , Yang, Mengmeng , Cheng, Yonghong , Liu, Jingya , Xiao, Bing , Chen, Siyu et al. Dielectric properties and thermal conductivity of epoxy composites using quantum-sized silver decorated core/shell structured alumina/polydopamine . | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING , 2019 , 118 , 302-311 .
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Enhanced breakdown strength of aligned-sodium-titanate-nanowire/epoxy nanocomposites and their anisotropic dielectric properties SCIE
期刊论文 | 2019 , 120 , 84-94 | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
WoS CC Cited Count: 3
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Abstract :

In this work, sodium titanate (Na2Ti6O13) nanowire/epoxy nanocomposites with different nanowire alignments and thicknesses were fabricated by employing the DC electric field during curing process. Nanocomposites showed obvious anisotropic dielectric properties. When nanowires were aligned perpendicularly to the electric field directions (X-Y-aligned), the breakdown strength (E-B) of nanocomposites with thickness of 1 mm and 0.5 wt % nanowires increased by 9.6% or 11%, compared to that of pure epoxy or no-alignment nanocomposites. When the thickness decreases to 10 mu m, the E-B enhancement further increased to 87%, compared to that of no-alignment samples. Thermally stimulated discharge current (TSDC) results indicated that more electronic deep traps were introduced perpendicular to alignment direction of nanowires and more shallow traps existed in the direction parallel to the oriented nanowires. The origin of the anisotropy in E-B of nanocomposites was studied by analyzing the orientations of interfaces and the nanowires' anisotropic crystal structure. This work gives invaluable guidelines for designing of thermoset functional materials.

Keyword :

Anisotropy Breakdown strength Directional orientation Dielectric properties Epoxy nanocomposites

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GB/T 7714 Chen, Siyu , Cheng, Yonghong , Xie, Qian et al. Enhanced breakdown strength of aligned-sodium-titanate-nanowire/epoxy nanocomposites and their anisotropic dielectric properties [J]. | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING , 2019 , 120 : 84-94 .
MLA Chen, Siyu et al. "Enhanced breakdown strength of aligned-sodium-titanate-nanowire/epoxy nanocomposites and their anisotropic dielectric properties" . | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING 120 (2019) : 84-94 .
APA Chen, Siyu , Cheng, Yonghong , Xie, Qian , Xiao, Bing , Wang, Zhengdong , Liu, Jingya et al. Enhanced breakdown strength of aligned-sodium-titanate-nanowire/epoxy nanocomposites and their anisotropic dielectric properties . | COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING , 2019 , 120 , 84-94 .
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Enhanced oxygen reduction reaction through Ca and Co Co-doped YFeO3 as cathode for protonic ceramic fuel cells EI SCIE
期刊论文 | 2019 , 413 , 148-157 | Journal of Power Sources
WoS CC Cited Count: 1
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Abstract :

Protonic ceramic fuel cells offer the potential for environmentally sustainable and cost-effective electric power generation. However, the power outputs of protonic ceramic fuel cells are far from the requirements due to the lack of active cathodes. In this work, porous thin sheets CaxY1-xFe0.5Co0.5O3-δ (x = 0.1, 0.3 and 0.5) are synthesized by a modified pechini method and investigated as cathode materials for protonic ceramic fuel cells. CaxY1-xFe0.5Co0.5O3-δ show high electrical conductivities and excellent chemical compatibility with Ba(Zr0.1Ce0.7Y0.2)O3 electrolyte. The maximum electrical conductivity of Ca0.3Y0.7Fe0.5Co0.5O3-δ reaches 202 S cm−1 in air at 750 °C. The detailed mechanism for oxygen reduction reaction reveals that the rate-limiting step of oxygen reduction reaction is transformed from charge transfer to O2 adsorption-dissociation with temperature rising or Ca doping. The composite cathode Ca0.3Y0.7Fe0.5Co0.5O3-δ-Ba(Zr0.1Ce0.7Y0.2)O3 presents a relatively low polarization resistance of 0.07 Ω cm2 at 750 °C in air. The power density of the anode-supported cell of NiO– Ba(Zr0.1Ce0.7Y0.2)O3∣Ba(Zr0.1Ce0.7Y0.2)O3∣Ca0.3Y0.7Fe0.5Co0.5O3-δ-Ba(Zr0.1Ce0.7Y0.2)O3 is 798 mW cm−2 as the electrolyte thickness is about 150 μm. The prepared CaxY1-xFe0.5Co0.5O3-δ oxides are promising candidates as high-performance cathodes for protonic ceramic fuel cells. © 2018 Elsevier B.V.

Keyword :

Anode supported cell Chemical compatibility Composite cathode Electrical conductivity High electrical conductivity Modified Pechini method Oxygen reduction reaction Polarization resistances

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GB/T 7714 Cui, Jiajia , Wang, Junkai , Zhang, Xiongwen et al. Enhanced oxygen reduction reaction through Ca and Co Co-doped YFeO3 as cathode for protonic ceramic fuel cells [J]. | Journal of Power Sources , 2019 , 413 : 148-157 .
MLA Cui, Jiajia et al. "Enhanced oxygen reduction reaction through Ca and Co Co-doped YFeO3 as cathode for protonic ceramic fuel cells" . | Journal of Power Sources 413 (2019) : 148-157 .
APA Cui, Jiajia , Wang, Junkai , Zhang, Xiongwen , Li, Guojun , Wu, Kai , Cheng, Yonghong et al. Enhanced oxygen reduction reaction through Ca and Co Co-doped YFeO3 as cathode for protonic ceramic fuel cells . | Journal of Power Sources , 2019 , 413 , 148-157 .
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Easy synthesis of multi-shelled ZnO hollow spheres and their conversion into hedgehog-like ZnO hollow spheres with superior rate performance for lithium ion batteries EI Scopus SCIE
期刊论文 | 2019 , 464 , 472-478 | Applied Surface Science
WoS CC Cited Count: 40 SCOPUS Cited Count: 45
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Herein, uniform multi-shelled ZnO hollow spheres were synthesized, especially hedgehog-like and triple-shelled ZnO hollow spheres were synthesized for the first time by a simple hydrothermal method capable of controlling the number of internal multishells, which are achieved by controlling the calcination process. Used as anodes for lithium ion batteries, the hedgehog-like ZnO hollow spheres show excellent rate capacity, good cycling performance, and high initial specific capacity. A superior capacity, up to 109 mAh g−1 with minimal irreversible capacity (i.e., coulomb efficiency of 99.1%) after 100 cycles is achieved at a current rate of 100 mA g−1, and a capacity of 98.8 mAh g−1 is obtained at a current rate of 1 A g−1. However, a high discharge of 253.6 mA h g−1 for the hedgehog-like ZnO hollow spheres can still be achieved when the current rate is reduced back to 100 mA g−1. © 2018 Elsevier B.V.

Keyword :

Coulomb efficiency Cycling performance Hollow sphere Hydrothermal methods Irreversible capacity Rate capacity Rate performance Specific capacities

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GB/T 7714 Wu, Guanglei , Jia, Zirui , Cheng, Yonghong et al. Easy synthesis of multi-shelled ZnO hollow spheres and their conversion into hedgehog-like ZnO hollow spheres with superior rate performance for lithium ion batteries [J]. | Applied Surface Science , 2019 , 464 : 472-478 .
MLA Wu, Guanglei et al. "Easy synthesis of multi-shelled ZnO hollow spheres and their conversion into hedgehog-like ZnO hollow spheres with superior rate performance for lithium ion batteries" . | Applied Surface Science 464 (2019) : 472-478 .
APA Wu, Guanglei , Jia, Zirui , Cheng, Yonghong , Zhang, Hongxia , Zhou, Xinfeng , Wu, Hongjing . Easy synthesis of multi-shelled ZnO hollow spheres and their conversion into hedgehog-like ZnO hollow spheres with superior rate performance for lithium ion batteries . | Applied Surface Science , 2019 , 464 , 472-478 .
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Thickness-tunable growth of ultra-large, continuous and high-dielectric h-BN thin films SCIE
期刊论文 | 2019 , 7 (7) , 1871-1879 | JOURNAL OF MATERIALS CHEMISTRY C
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The outstanding thermal properties, mechanical properties and large optical bandgap of hexagonal boron nitride (h-BN) make it very attractive for various applications in ultrathin 2D microelectronics. However, the synthesis of large lateral size and uniform h-BN thin films with a high breakdown strength still remains a great challenge. Here, we comprehensively investigated the effect of growth conditions on the thickness of h-BN films via low pressure chemical vapor deposition (LPCVD). By optimizing the LPCVD growth parameters with electropolished Cu foils as the deposition substrates and developing customized `` enclosure'' quartz-boat reactors, we achieved thickness-tunable (1.50-10.30 nm) growth of h-BN thin films with a smooth surface (RMS roughness is 0.26 nm) and an ultra-large area (1.0 cm x 1.0 cm), meanwhile, the as-grown h-BN films exhibited an ultra-high breakdown strength of similar to 10.0 MV cm(-1), which is highly promising for the development of electrically reliable 2D microelectronic devices with an ultrathin feature.

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GB/T 7714 Zhang, Dujiao , Wu, Feihong , Ying, Qi et al. Thickness-tunable growth of ultra-large, continuous and high-dielectric h-BN thin films [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2019 , 7 (7) : 1871-1879 .
MLA Zhang, Dujiao et al. "Thickness-tunable growth of ultra-large, continuous and high-dielectric h-BN thin films" . | JOURNAL OF MATERIALS CHEMISTRY C 7 . 7 (2019) : 1871-1879 .
APA Zhang, Dujiao , Wu, Feihong , Ying, Qi , Gao, Xinyu , Li, Nan , Wang, Kejing et al. Thickness-tunable growth of ultra-large, continuous and high-dielectric h-BN thin films . | JOURNAL OF MATERIALS CHEMISTRY C , 2019 , 7 (7) , 1871-1879 .
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Effect of Flow Rate and Precursor Sublimation Temperature on the LPCVD Growth of Hexagonal Boron Nitride EI CPCI-S Scopus CSSCI-E
会议论文 | 2018 , 4 | 2nd IEEE International Conference on Dielectrics (ICD)
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Hexagonal boron nitride (h-BN) is known as promising 2D material with a wide band-gap (5.2 similar to 5.9 eV) which has high breakdown strength. To synthesize h-BN films, chemical vapor deposition (CVD) method is proved to be an effective method that allows the scaled synthesis of h-BN. In this study, we demonstrate a low pressure chemical vapor deposition (LPCVD) method to synthesize complete and uniform h-BN films. In order to obtain high crystalline h-BN films, we studied the flow rate of carrier gas and precursor sublimation temperature on the growth of h-BN films. The results indicate the flow rate of carrier gas has little influence on growth of h-BN films. Nevertheless, the lower precursor sublimation temperature contributes to lower growth rate, which makes the thickness of h-BN films is easily controlled. When the sublimation temperature is more than 100 square the thickness of h-BN films is hard to control. The breakdown strength of h-BN films is higher than 9.0 MV/cm from the I-V test, which makes h-BN films ideal substrates and insulators for 2D microelectronic devices.

Keyword :

breakdown strength CVD electrochemical polished synthesis h-BN 2D material

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GB/T 7714 Zhang, Dujiao , Meng, Guodong , Wang, Kejing et al. Effect of Flow Rate and Precursor Sublimation Temperature on the LPCVD Growth of Hexagonal Boron Nitride [C] . 2018 : 4 .
MLA Zhang, Dujiao et al. "Effect of Flow Rate and Precursor Sublimation Temperature on the LPCVD Growth of Hexagonal Boron Nitride" . (2018) : 4 .
APA Zhang, Dujiao , Meng, Guodong , Wang, Kejing , Gao, Xinyu , Dong, Chengye , Wu, Feihong et al. Effect of Flow Rate and Precursor Sublimation Temperature on the LPCVD Growth of Hexagonal Boron Nitride . (2018) : 4 .
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