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A novel double dielectric barrier discharge reactor with high field emission and secondary electron emission for toluene abatement

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Plasma Science and Technology 2022年第1期24卷 118-128页

作者： Shijie LI Xin YU Xiaoqing DANG Pengyong WANG Xiangkang MENG Huachun ZHENG School of Environment&Municipal Engineering Xi'an University of Architecture&TechnologyXi'an 710055People’s Republic of China Shaanxi Key Laboratory of Environmental Engineering Xi'an University of Architecture&TechnologyXi’an 710055People’s Republic of China Key Laboratory of Northwest Water Resources Environment and EcologyMinistry of EducationXi'an University of Architecture and TechnologyXi’an 710055People’s Republic of China

Dielectric barrier discharge(DBD)has been extensively investigated in the fields of environment and energy,whereas its practical implementation is still limited due to its unsatisfactory energy *** order to improve the energy efficiency of DBD,a novel double dielectric barrier discharge(NDDBD)reactor with high field emission and secondary electron emission was developed and compared with traditional DDBD(TDDBD)***,the discharge characteristics of the two DDBD reactors were *** to TDDBD,the NDDBD reactor exhibited much stronger discharge intensity,higher transferred charge,dissipated power and gas temperature due to the effective utilization of cathode field emission and secondary electron ***,toluene abatement performance of the two reactors was *** toluene decomposition efficiency and mineralization rate of NDDBD were much higher than that of TDDBD,which were 86.44%-100%versus 28.17%-80.48%and 17.16%-43.42%versus 7.17%-16.44%at 2.17-15.12 W and 1.24-4.90 W *** also exhibited higher energy yield than TDDBD,whereas the overall energy constant k_(overall)of the two reactors were ***,plausible toluene decomposition pathway in TDDBD and NDDBD was suggested based on organic intermediates that generated from toluene *** finding of this study is expected to provide reference for the design and optimization of DBD reactor for volatile organic compounds control and other applications.

关键词： toluene removal double dielectric barrier discharge field emission secondary electron emission decomposition mechanism

field emission characteristics of nano-sheet carbon films deposited by quartz-tube microwave plasma chemical vapour deposition

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Chinese Physics B 2008年第4期17卷 1467-1471页

作者：顾广瑞金哲 Ito Toshimichi Department of Physics College of ScienceYanbian University Division of Electrical Electronic and Information EngineeringGraduate School of EngineeringOsaka University

Nano-sheet carbon films are prepared on Si wafers by means of quartz-tube microwave plasma chemical vapour deposition （MPCVD） in a gas mixture of hydrogen and methane. The structure of the fabricated films is investigated by using field emission scanning electron microscope （FESEM） and Raman spectroscopy. These nano^carbon films are possessed of good field emission （FE） characteristics with a low threshold field of 2.6 V/μm and a high current density of 12.6 mA/cm^2 at an electric field of 9 V/μm. As the FE currents tend to be saturated in a high E region, no simple Fowler-Nordheim （F-N） model is applicable. A modified F N model considering statistic effects of FE tip structures and a space-charge-limited-current （SCLC） effect is applied successfully to explaining the FE data observed at low and high electric fields, respectively.

关键词： field emission carbon films nano-sheet microwave plasma chemical vapour deposition

field emission from one-dimensional single-crystalline NdB_6 nanowires

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Journal of Rare Earths 2013年第2期31卷 145-148页

作者：范庆华张勤远赵彦明丁琪伟 Department of Physics South China University of Technology MOE Key Lab of Specially Functional Materials South China University of Technology School of Electrical and Electronic Engineering Nanyang Technological University

A facile catalysis-free method was utilized to synthesize functional neodymium hexaboride （NdB6 ） nanowires of single crystal using Nd powders and BCl 3 as starting materials. The XRD pattern confirmed that a single phase NdB 6 could be obtained. Raman-spectra elucidated the active vibrational modes of the hexaborides. The TEM images clearly showed that the hexaborides were submicron in size with a cubic morphology. The field emission of these one-dimensional NdB6 nanowires showed a low field emission turn-on （5.55 V/μm at a current density of 10 μA/cm2 ）, and high current density with a field enhancement factor of 1037. The emission current density and the electric field followed the Fowler-Nordheim （F-N） relationship. The good performance for field emission was attributed to the single-crystalline structure and the nanowire geometry.

关键词： NdB 6 nanowires field emission rare earths

field emission properties of capped carbon nanotubes doped by alkali metals:a theoretical investigation

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Chinese Physics B 2012年第5期21卷 647-651页

作者：靳磊付宏刚谢颖于海涛 School of Chemical Engineering and Technology Harbin Institute of Technology Key Laboratory of Functional Inorganic Material Chemistry of Ministry of Education Heilongjiang University

The electronic structures and field emission properties of capped CNT55 systems with or without alkali metal atom adsorption were systematically investigated by density functional theory *** results indicate that the adsorption of alkali metal on the center site of a CNT tip is energetically *** addition,the adsorption energies increase with the introduction of the electric *** excessive negative charges on CNT tips make electron emittance much easier and result in a decrease in work ***,the inducing effect by positively charged alkali metal atoms can be reasonably considered as the dominant reason for the improvement in field emission properties.

关键词： field emission density functional theory carbon nanotube alkali metal

field emission from single-crystalline CeB_6 nanowires

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Journal of Rare Earths 2010年第3期28卷 424-427页

作者：赵彦明欧阳柳生邹春云许军旗董有忠范庆华 School of Physics South China University of Technology

We presented a field electron emission measurement of single crystalline CeB6 *** nanowires exhibited a low turn-on electric field(7.6 V/μm at 10 μA/cm2),and the deviation of Fowler-Nordheim(F-N) plots from straight line was observed in field electron emission *** field enhancement factors were obtained by separate straight line *** nonlinearity in the F-N plots may be attributed to the non-uniform field electron emission of CeB6 *** field emission properties of the ...

关键词： CeB6 nanowires field emission rare earths

field emission Characteristics of Conducting Polymer Films Conditioned by Electric Discharge

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Journal of Materials Science & Technology 2006年第5期22卷 677-680页

作者： Guohong LAI Zhenglin LI Lan CHENG Junbiao PENG Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology Institute of Polymer Optoelectronic Materials and Devices South China University of Technology Guangzhou 510640 China

A pure conducting polymer （PANI-CSA） film conditioned by an electric discharge was tentatively utilized as an cathode for emitting electrons under electric fields. The emission of electrons was observed using a phosphor （ZnO：Zn） screen excited by electrons from the conditioned film. The film morphology was investigated using a scanning electron microscope and it was found that undulate whisker-like sites formed on the surface. The emission was presumably due to the undulate whisker-like sites. The field enhancement factor was estimated to be as high as 1150. The electron emitting process of the PANI-CSA film conditioned by electric discharge was also discussed.

关键词： Conducting polymer field emission Electric discharge

field emission properties of a-C and a-C：H films deposited on silicon surfaces modified with nickel nanoparticles

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Chinese Physics B 2016年第4期25卷 398-402页

作者：姜金龙王玉宝王琼黄浩魏智强郝俊英 Department of Physics Lanzhou University of Technology Lanzhou 730050 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

The a-C and a-C：H films are deposited on silicon surfaces modified with and without nickel nanoparticles by using mid-frequency magnetron sputtering. The microstructures and morphologies of the films are analyzed by Raman spec- troscopy and atomic force microscopy. field emission behaviors of the deposited films with and without nickel nanopar- ticles modification are comparatively investigated. It is found that the hydrogen-free carbon film exhibits a high field emission current density and low turn-on electric field compared with the hydrogenated carbon film. Nickel modifying could increase the current density, whereas it has no significant effect on the turn-on electric field. The mechanism of field electron emission of a sample is discussed from the surface morphologies of the films and nickel nanoparticle roles in the interface between film and substrate.

关键词： DLC films field emission magnetron sputtering nickel nanoparticles modification

field emission of carbon nanotube array with normal-gate cold cathode

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Chinese Physics B 2010年第5期19卷 483-487页

作者：戴剑锋慕晓文乔宪武陈小婷王军红 State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials Lanzhou University of Technology School of Science Lanzhou University of Technology

A hexagon pitch carbon nanotube （CNT） array vertical to the normal gate of cold cathode field emission displayer （FED） is simulated by solving the Laplace equation. The calculated results show that the normal gate causes the electric field around the CNT tops to be concentrated and the emission electron beam becomes a column. The field enhancement factor and the emission current intensity step up greatly compared with those of the diode structure. emission current density increases rapidly with the decrease of normal-gate aperture. The gate voltage exerts a critical influence on the emission current.

关键词： field emission hexagon pitch carbon nanotube (CNT) array emission current density field enhancement factor

field emission from Silicon Nanocrystallite Films with Compact Alignment and Uniform Orientation

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Chinese Physics Letters 2004年第1期21卷 203-206页

作者：郁可王伟明朱自强张永胜虞献文陈少强李琼杨广达朱建中陈群陆卫资剑 DepartmentofElectricEngineering EastChinaNormalUniversityShanghai200062 DepartmentofChemistry EastChinaNormalUniversityShanghai200062 AnalyticalCenter EastChinaNormalUniversityShanghai200062 StateKeyLaboratoryforInfraredPhysics InstituteofTechnicalPhysicsChineseAcademyofSciencesShanghai200083 NationalKeyLaboratoryforAppliedSurfacePhysics FudanUniversityShanghai200433

Patterned silicon nanocrystallite (SiNC) films were fabricated on (100) orientation p-type boron-doped silicon wafer by the hydrogen ion implantation technique and the anodic etching method. The efficient field emission with low turn-on field of about 3.5V/μm at current density of 0.1μA/cm2 was obtained. The emission current density from the SiNC films reached 1mA/cm2 under a bias field of about 9.1V/μm. The experimental results demonstrate that there are great potential applications of the SiNC films for flat panel displays. A surface treatment with hydrogen plasma was performed on the SiNC films and a significant improvement of emission properties was achieved.

关键词： field emission