ADVANCED MATERIALS
·
2013
·Vol. 25
·期 40
·5750-5755
·
IF 14.829
Jizhong Song,Sergei A. Kulinich,Jian Yan,Zhigang Li,Jianping He,Caixia Kan,Haibo Zeng
Graphical Highly epitaxial ZnO nanowire-on-nanoplate structures as efficient and transferable electron field emitters are reported here. Well-faceted ZnO nanoplates can be used as efficient substrates for the epitaxial growth of nanowires with a sharp and high-quality interface, which significantly improves its field emitter performance. Because of its scalable preparation, high performance and facile transfer, the novel material is of high potential for applications in various optoelectronic devices.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
VACUUM
·
2020
·
IF 2.906
Han Wu,Siqi Shen,Jun Li,Xiaohong Chen,Zhejuan Zhang,Wei Ou-Yang
Boosted field emission (FE) cathodes of silicon carbide nanowires (SiC NWs) filled with polyaniline (PANI) and polypyrrole (PPY) coatings were prepared via cyclic voltammetry method, which is facile, feasible and capable to control the coating-thickness. As compared to pristine SiC, the average turn-on field ( E on ) of SiC/PANI and SiC/PPY under several of repeat experiment decreased from 1.84 to 1.44 and 1.04 V/μm, respectively. The lowest E on of SiC/PPY even dropped down to 0.95 V/μm with raised field enhancement-factor and conductivity, identifying that the FE properties have been improved by depositing PANI and PPY due to enhanced conductivity. However, the conductivity would be saturated with the continuously increasing depositing-thickness and overly thick coatings would block the efficient FE points and reduce the effective electric field between cathode and anode, causing a worse FE performance instead. Besides, the optimal FE performance was obtained in SiC/PPY, which not only had a much lower E on , but also reinforced the stability. The synergy of conductivity effect and thickness effect found in this study indicates SiC/PPY to be a promising candidate for FE applications in vacuum electronic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Shanliang Chen,Minghui Shang,Lin Wang,Zuobao Yang,Fengmei Gao,Jinju Zheng,Weiyou Yang
Low turn-on fields together with boosted stabilities are recognized as two key factors for pushing forward the implementations of the field emitters in electronic units. In current work, we explored superior flexible field emitters based on single-crystalline 3C-SiC nanowires, which had numbers of sharp edges, as well as corners surrounding the wire body and B dopants. The as-constructed field emitters behaved exceptional field emission (FE) behaviors with ultralow turn-on fields (Eto) of 0.94–0.68 V/μm and current emission fluctuations of ±1.0–3.4%, when subjected to harsh working conditions under different bending cycles, various bending configurations, as well as elevated temperature environments. The sharp edges together with the edges were able to significantly increase the electron emission sites, and the incorporated B dopants could bring a more localized state close to the Fermi level, which rendered the SiC nanowire emitters with low Eto, large field enhancement factor as well as robust current emission stabilities. Current B-doped SiC nanowires could meet all essential requirements for an ideal flexible emitters, which exhibit their promising prospect to be applied in flexible electronic units.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 45
·期 4
·2299-2304
·
IF 1.491
Song Meng,Xu Peng,Han Lijing,Yi Lan,Wang Xu,Li Zhenhua,Shang Xuefu,Wang Xiumin,Wu Huizhen,Zhao
Pei,Song Yenan,Wang Miao
We present a three-dimensionally configured cathode with enhanced field-emission performance formed by combining carbon nanotube (CNT) emitters with a nickel foam (NiF) substrate via a conventional screen-printing technique. The CNT/NiF cathode has low turn-on electric field of 0.53 V μ m −1 (with current density of 10 μ A cm −2 ) and threshold electric field of 0.87 V μ m −1 (with current density of 0.1 mA cm −2 ), and a very high field enhancement factor of 1.4 × 10 4 . The porous structure of the NiF substrate can greatly improve the field-emission properties due to its large specific surface area that can accommodate more CNTs and increase the emitter density, as well as its high electrical and thermal conductivities that facilitate current transition and heat dissipation in the cathode. Most importantly, the local electric field was also enhanced by the multistage effect resulting from the rough metal surface, which furthermore leads to a high field enhancement factor. We believe that this improved field-emission performance makes such cathodes promising candidates for use in various field-emission applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2019
·Vol. 3
·期 10
·2120-2127
·
IF 0
Qiang Zhang,Xicheng Wang,Zuobin Tang,Yuhua Wang
A novel blue-emitting phosphor, Na3ScSi2O7:Ce3+ (NSSO:Ce3+), was synthesized with a solid-state method at low temperature successfully. Its crystal structure, band structure, and photoluminescence and cathodoluminescence properties were researched in detail. The phase formation and the crystal structure were confirmed by powder X-ray diffraction analysis and the Rietveld refinement method, respectively. Under the excitation of n-UV light, the optimal NSSO:0.02Ce3+ phosphor can yield blue emission centered at 452 nm with a high quantum efficiency of 50.9%. The PL intensity of the NSSO:0.02Ce3+ phosphor remains at 71.46% of the initial value when the temperature is increased from room temperature to 150 °C, indicating good thermal stability. A WLED lamp was obtained by combining a 360 nm n-UV chip with Sr2SiO4:Eu2+, (Ca, Sr)AlSiN3:Eu2+ and NSSO:0.02Ce3+ phosphors, in which the color coordinates, CCT and CRI are (0.360, 0.348), 4409 K and 90.9, respectively. Moreover, under low voltage electron bombardment, the phosphor can emit blue emission with high luminescence intensity, current saturation and resistance. All the results indicate that the NSSO:Ce3+ phosphor shows much potential for the application of both WLEDs and field emission displays (FEDs). Our research has also offered a new insight and perspective that using Sc-based sorosilicates as host can be an appropriate strategy for developing excellent inorganic luminescence materials.
研究领域:
材料科学
·
光学工程
·
无机化学
·
固态照明
·
显示技术
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yanhong Zhou,Li Xiang,Zhiyuan Zhao,Tao Xu,Qi Wang,Xiaoyu Zhang,Zichu Zhang,Wei Zeng,Ning Wei,Limin Ruan,Yi Xiong,Siliang Wang,Tongqing Liao
In a biomimetic iontronic electrochemical system, the interior ions can move accompanied by surrounding charges, and then facilitating the integral carrier transfer, yet their transfers are still restricted by concentration gradient and temperature. Here, an ordered porous bismuthene electrode is designed, composed by bismuthene, bismuthene-derived Bi 2 O 3 &BiOCl, and borophene materials, with supercapacitive 4.96 F g −1 attribute retaining 89.6 % after 29,600 cycles, and the dispersive bismuthene nanosheets are also embedded into regenerated silk fibroin as elastic electrolyte. The resultant symmetrical iontronic pressure sensor shows high sensitivity of 2.31 kPa −1 in a wide 0.2–10 kPa range, and 0.41 kPa −1 sensitivity ranging 10–48 kPa, fast response/recovery time of 60/50 ms, and low detection limit of 0.45 Pa. The simulation and mechanism analysis demonstrate that a field emission effect plays an important role in electrolyte, in which the ions around the ordered bismuthene as emitters are launched and moved along the inner bismuthene nanosheets, step by step, to enormously shorten the ions migration path and effectively accelerate ion-charge pair transfer. Compared to the device without bismuthene in electrolyte, the sensitivity of sensor is improved by 23.81 times with high reproducibility over 1000 cycles. Additionally, the poly (3, 4-ethylenedioxythiophene): poly (styrene sulfonate) in electrolyte effectively constrains the movements of polymer molecules, contributing to high temperature adaptability from −15 to 70 ℃. In practical application, a tiny pressure monitoring in hot/cold perception is demonstrated, revealing a promising application in wearable systems and intelligent robotics.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 28
·1-8
·
IF 2.8
Liu Xingzhen,Dong Daniel Y.,Zhou Huizi,Huang Weijun,Qian Weijin
Different types of carbon nanotube (CNT) nanomaterials were fabricated using electrophoretic deposition (EPD) and chemical vapor deposition (CVD) methods to make the field emission (FE) and thermo-electrochemical cell (TEC) electrodes. The morphological and structural properties of CNT electrodes were characterized by SEM, Raman, and TEM. The graphite multi-walled CNT (MWNT) electrode by EPD (EPD-GMWNT) exhibited the best FE properties with the turn on field and threshold field of 1.7 and 2.97 V·μm −1 , respectively. In addition, EPD-GMWNT electrodes presented the best TEC properties with the current density of 2.09 mA·m −2 , the maximum power density of 0.37 W·m −2 , and the relative power conversion efficiency of 0.85%, at the temperature difference of 50 °C. MWNT electrode by CVD growth also demonstrated good FE and TEC performances. Both types of emitters, especially GMWNTs, possess low ratio of the D band peak to the G band peak (I D /I G ), implying the extreme importance of structural crystallinities of CNTs for FE and TEC applications. The results suggest that construction of MWNT electrodes with low I D /I G ratio might be a promising way for the practical applications of FE and TEC devices.
研究领域:
材料科学
·
纳米技术
·
物理化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Dajun Wu,Yuyao Chen,Xuekun Hong,Lianwei Wang,Wei Ou-Yang,Shi Tao,Quanliang Zhao,Bin Qian,Paul K. Chu
The low efficiency and instability of electron emission from two-dimensional (2D) materials such as WS 2 and NiS hamper application to vacuum microelectronic devices. Although nickel-based alloys have many favorable physicochemical properties suitable for nanoelectronics , electron field emission (FE) from heterostructures comprising tungsten-nickel sulfide alloys and graphite carbon (WNi–S/C) has been seldom studied because it is difficult to fabricate the nanostructures in situ . In this work, field emitters composed of the WNi–S/C nanobelt composite are produced on Si microchannel plates (WNi–S/C@Si) hydrothermally. The structure has a porous and vertically aligned 3D morphology in addition to excellent adhesion strength with the substrate. Geometrical modulation of the WNi–S/C@Si is performed by changing the hydrothermal reaction temperature and an ultralow turn-on electric field of 0.51 V μm −1 for a current density 0.1 mA cm −2 , threshold electric field of 0.65 V μm −1 for a current density of 1 mA cm −2 , and stability of 97.1% for 8 h are accomplished. The related mechanisms are investigated and discussed. Moreover, finite element simulation shows that not only the shape of the nanostructures but also the high aspect plays a key role in reducing screen effects. These outstanding properties suggest large potential in high-performance FE and vacuum nanodevices .
研究领域:
材料科学
·
纳米电子学
·
真空微电子学
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2016
·Vol. 7
·期 1
·32-42
·
IF 2.657
Bin Sun,Yan Wang,Guifu Ding
We report on the fabrication, characterization, and field emission behavior of cold electron cathodes that are specifically designed to be used for X-ray sources. The emitter was designed as a two-tier system, with the patterned CNT field emission array and the Pt comb electrode beneath. The micromachining patterning process, which enhanced the edge effect, significantly improved the field emission performance. By using an inorganic binder, the cathode could resist high temperature annealing up to 800°C. Our novel emitter showed relatively good field emission properties such as low turn on field, high current density, and good stability. We ascribed the improved emission properties after the annealing process to the oxygen desorption induced decrease of work function, and defect annealing which could stabilize the emitter. To check the application of the emitter, the fabricated emitter was sealed in a conventional X-ray tube. The blackened shade on the sensitive film confirmed the X-ray generation, which demonstrated that our emitter successfully survived the high temperature processing steps of the X-ray source fabrication.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Physics
·
2021
·
IF 3.56
Yang JianJun,Shao ShuangShuang,Li YaXin,Wang YueHui,Feng Chi
A large-scale growth of zinc oxide (ZnO) nanorod arrays on graphene sheets was fabricated by a hydrothermal technique, and the Fowler–Nordheim theory was used to build a model to describe the properties of the arrays’ field emission. The results indicated that the morphological characteristics of the ZnO nanorods grown on the graphene sheets can be easily tuned by varying the reaction time and concentrations of the reaction solution. The regular ordered ZnO nanorods arrays on the graphene sheets were obtained under the appropriate experimental conditions. Further, this composite cathode was demonstrated to possess excellent field emission properties due to the outstanding mechanical and electrical properties of graphene. The field emission current density of the composite cathode reached 1,448 μA cm–2 at the electric field of 16.5 V μm–1. The key parameter, field enhancement factor, reached 6,366, while the pure graphene cathode field is about 1,660. These specific nanorod arrays with enhancement of the field emission properties would be useful to sensor or modulator units for accessing networks.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2012
·Vol. 4
·期 24
·7817-7824
·
IF 5.914
Yang Wang,Shouchuan Li,Hui Shi,Ke Yu
Two kinds of Cu2O–ZnO nano-heteroarchitectures were fabricated through a hydrothermal method. By utilizing polyethyleneimine (PEI) as a binding agent, ZnO nanoparticles were uniformly self-assembled onto Cu2O micro structures. Photoluminescence (PL), field emission and photocatalytic activities of the composite samples were investigated and compared with those of the pure Cu2O samples. The results reveal that ZnO nanoparticles combined on Cu2O microstructures remarkably changed the PL signals, and significantly enhanced the field emission and photocatalytic activities. The novel PL properties, enhanced field emission and photocatalysis activities are attributed to the electron transition and the inhibition of photo-induced electron–hole pairs recombination, which stem from interfacial defect states and energy band differentials at the interface of Cu2O and ZnO. The surface nano-protrusions, large surface area and better dye adsorption induced by ZnO nanoparticles are responsible for the field emission and photocatalysis improvements as well.
研究领域:
材料科学
·
光学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PLASMA SCIENCE & TECHNOLOGY
·
2021
·Vol. 23
·期 11
·115403
·
IF 1.567
Weisheng CUI,Qiaolu LIN,Hongbo LI,Shuai ZHAO,Yunge ZHANG,Yifan HUANG,Shuting FAN,Yiling SUN,Zhengfang QIAN,Renheng WANG
The formation of homogeneous dielectric barrier discharge (DBD) in air is a key scientific problem and core technical problem to be solved for the application of plasmas. Here, we report the effect of two-dimensional (2D) nanomaterial Ti3C2Tx (Tx = –F, –O and/or –OH) on regulating the electrical discharge characteristics. The field emission and weak bound state property of Ti3C2Tx can effectively increase the seed electrons and contribute to the generation of atmospheric pressure homogeneous air DBD. The electron avalanche development for the uneven electrode structure is calculated, and the discharge mode transition is modeled. The comparative analyses of discharge phenomena validate the regulation of Ti3C2Tx on the discharge characteristics of DBD. The light emission capture and the voltage and current waveforms verify that the transition of Townsend discharge to streamer discharge is effectively inhibited. The optical emission spectra are used to characterize the plasma and confirm that it is in a non-equilibrium state and the gas temperature is at room temperature. This is the first exploration of Ti3C2Tx on the regulation of electrical discharge characteristics as far as we know. This work proves the feasibility of Ti3C2Tx as a source of seed electrons to form homogeneous DBD, establishing a preliminary foundation for promoting the application of atmospheric pressure non-equilibrium plasma.
研究领域:
物理学
·
材料科学
·
等离子体科学
✓ 已验证
DOI
高影响因子
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