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A double-sided radiating flat-panel X-ray source device has been developed. The device has a diode configuration composed of an anode target of a tungsten thin film and field-emitter arrays of ZnO nanowires prepared on glass substrates. The X-ray radiation comes from both transmission and reflection of X-rays induced by electron bombardment. When operated at 24 kV with an anode current of 3.16 mA,...
The atomic edge, excellent conductivity, stable chemical and mechanical properties make graphene a good candidate for the scanning tunneling microscopy (STM) tip. Here, a one-step growth method is used to fabricate graphene STM tips. The graphene was directly grown on a sharp tungsten tip vertically by using microwave plasma enhanced chemical vapor deposition method without any catalyst. The high...
A concurrently high beam current and high current density carbon nanotube (CNT) cold cathode electron gun is herein developed. A radial electron source has been realized, formed from CNTs synthesized directly on the side walls of a stainless steel truncated-cone electron gun. Experimental results evidenced a 35 kV/50 mA electron beam can achieve a beam transparency of nearly 100% through the use of...
A transparent cold cathode panel was fabricated and applied in a double-side emitting light source using ZnO nanowire field emitter arrays(FEAs). ITO thin film coating on starting Zn film was adopted to modify the morphology and field-emission properties of ZnO nanowires. The transparent ZnO nanowire cold cathode panel shows more than 84.7% transmission in the visible light region. A fully sealed...
Using the ZnO nanowire emitters with the photoconductor as the anode, the concept of a light-responsive field emission display (FED) was demonstrated. The brightness of display can be automatically increased with the increasing of external light-intensity. Additionally, the photo/dark current ratio can be controllably adjusted by changing the device parameters. The response of conductivity of photoconductor...
ZnO nanowire field emitter arrays with non-coplanar focus electrode structure was designed. A simulation was conducted to verified the focusing ability of the focus electrode structure. The designed structure was realized successfully and the growth condition of ZnO nanowires in the structure was studied.
Field Emission Pattern Image of Carbon Nanotubes has been captured by using electron beam scanning analyzer. The measurement showed that the Faraday cup scanning method can provide a high resolution field emission sites distribution measurement (the best resolution is up to 0.01mm), which is higher than that using the transparent anode method.
A transmission anode flat panel X-ray source with the ZnO nanowire field emitter arrays(FEAs) has been realized. The thickness of the transmission-type flat panel X-ray target has been optimized to maximize the output intensity of X-rays. The EGSnrc-based Monte Carlo codes are utilized to simulate the X-ray intensity and spectrum generated from the target. The simulation results show that the target...
α-Fe2O3 nanomaterials with different morphology parameters were prepared by varying growth temperature in the thermal oxidation process. After current aging treatment, emission current density increased from 0.05 mA/cm2 to 5.70 mA/cm2 under applied electrical field of 7.8 MV/m.α-Fe2O3 nanoflakes prepared under 350 °C exhibits low threshold field of 5.1 MV/m. Current aging treatment was carried out...
Vacuum micro/nano electronic devices possess merits of radiation hardness, temperature tolerance, high working frequency and output power. It's regarded as the promising candidates for the application on ultra-high speed transistor [1, 2], portable and fast-switch X-ray source [3], free electron laser [4], field emission display [5] and so on. In the developing of modern vacuum electronic, to achieve...
Field electron emission patterns emitted from few-layer graphene with different edge morphology were investigated using field emission microscopy (FEM). The FEM image of few-layer graphene was observed as a “lantern”, which is composed of light and dark fringes. The relationship between graphene edge morphology and field emission pattern was investigated using a emission electron spatial interference...
A traveling wave tube (TWT) based on carbon nanotube (CNT) cold cathode is theoretically researched in this paper. A magnetic injection electron gun and helix slow-wave structure is adopted in the TWT. Simulation results show that the maximum output power of the CNT TWT can reach 54 W at 9.4 GHz with an input power of 50 mW, corresponding to the maximum gain of 30 dB, when the gyrating electron beam...
ZnO nanowires have potential applications as large area field emitters for plat panel x-ray source and high emission current is needed for such application. In this study, patterned ZnO nanowires with different separations have been fabricated on ITO coated glass substrate by thermal oxidation technique. It is found that the separation of the patterns affects the growth of ZnO nanowires. The field...
Lanthanum hexaboride (LaB6) nanowires have attracted much attention due to their outstanding physical properties. In order to enhance the developments of LaB6 nanowires, it is essential to study the field emission (FE) properties of LaB6 nanowires in different environments. Here, we investigate the effect of oxygen (O2) on the FE behaviors of LaB6 nanowires. And it is found that the oxygen content...
A theoretical model for one-dimensional CuO nanowire was established considering transport mechanisms induced by different defect concentration. By using a one-dimensional heat equation, the emission current was calculated by considering the temperature induced by the emission current. The maximum emission current density and maximum applied field was studied considering different electrical properties...
Amorphous indium-gallium-zinc-oxide thin film transistor (a-IGZO TFT) was used as active driving device for ZnO nanowire field emitters. The characteristics of ZnO FEAs controlled by a-IGZO TFT were studied. Low driving voltage, precise control and stabilization of field emission current are achieved.
We report the featured field electron emitter of Si tip with individually integrated nano-channel. A rational procedure was developed to fabricate the uniform integrated device. The Si nano-channel can limit both current and heat flow. The heat resistance of the nano-channel resulted in the heat accumulation at the tip apex, inducing the thermally assisted field electron emission. The negative feedback...
Pulse field emission characteristics of a single carbon nanotube (CNT) were investigated using an in-situ scanning electron microscope combined field emission measurement system. The critical field emission current density was related to the length of CNT. Given a certain pulse period, CNT which is shorter in length, could bear higher electric field strength and achieve higher current density.
Fluorine doping of ZnO nanowires was realized by using a biased CF4 plasma treatment. The morphology, work function, electrical characteristics and field emission properties of ZnO nanowires were investigated before and after CF4 plasma treatment. Though lowered work function and resistance were observed, the ZnO nanowires exhibit higher turn-on field after CF4 plasma treatment. The results were explained...
The feasibility of preparation of nanowire on glass favors the realization of large area devices, which makes nanowire field emitter arrays (FEAs) good candidate for large-area vacuum microelectronics applications. In this study, a coaxial gated ZnO nanowire FEAs was fabricated. Effective emission current modulation by the gate voltage was achieved and the addressing capability was demonstrated.
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