field emission – TechConnect Briefs

Low turn-on field of ZnO nanostructures grown with catalyst-free vapor-phase transport

Yang S-H, Hsu Y-M, Tsai M-W, Chang L-L, Chiang P-J, National Kaohsiung University of Applied Sciences, TW

Low turn-on electric field of ZnO nanostructures were grown with pseudo-catalyst by vapor phase transport. A ZnO:Al (AZO) seed layer was deposited on a silicon substrate by RF magnetron sputtering, which formed nucleation sites and [...]

Carbon nanotubes based photocathodes for multisource X-Ray generators

Mazellier J.-P., Thales Research & Technology, FR

Carbon nanotubes (CNT) cathodes are cold field emitters. CNT photocathode consist in combination of CNTs with photodetectors. In a CNT photocathode, the photodetector limits the current that the CNT emit under electric field. As a [...]

A field-emission X-ray source using an anisotropically focused electron beam

Jung S., Kim D., Seol S.K., Korea Electrotechnology Research Institute, KR

A field-emission X-ray source for dental imaging with an anode voltage of 70 kV and an anode current of more than 1 mA was designed and assembled using an anisotropically focused electron beam. With up [...]

Micro Crumples for Self-Assembly of Field Emission Devices

Sambandan S., Palo Alto Research Center, US

We study the electrostatic properties of crumpled conducting films, in particular the effective vertical electric field. The inspiration for this work is the possibility of self-organizing field emission devices with aims to reduce the cost [...]

Enhanced Field Emission properties of Titanium decorated Multiwalled Carbon Nanotubes

Sharma H., Kaushik V., Shukla A.K., Vankar V.D., Indian Institute of Technology Delhi, IN

we report the role of Ti on the growth and field emission properties of multiwalled carbon nanotubes (MWCNTs), prepared by microwave plasma enhanced chemical vapour deposition technique (MPECVD). First set of studies were carried out [...]

Application of direct growth ZnO nanaotetrapods in field emission device

Zhang Q., Zhang Y., Qi J., Zhang Q., Zhang Y., Liao Q., Ye N., University of Science and Technology, Beijing, CN

In summary, we demonstrate the ZnO nanotetrapod synthesized by a simple vapor phase transport process can be good field emission emitters. The field emission measurement as-synthesized materials reveal that these samples have low turn-on field [...]

High Resolution Surface Imaging Using a Carbon Nanotube Array with Pointed Height Distribution

Roy Mahapatra D., Anand S.V., Sinha N., Melnik R.V.N., Massachusetts Institute of Technology, US

In this paper, we discuss a new methodology to obtain high resolution electron micrographs of different materials using field emission from a pointed array of carbon nanotubes (CNTs) and a technique to map the surface [...]

Synthesis of Self-aligned Tungsten Nanowires on Single Crystalline Tungsten Substrates

Wu W., Yu Q., Pei S-S, University of Houston, US

Metallic nanowires have attracted much attention due to their unique mechanical, magnetic, optical and electronic properties, and their function as well-defined building blocks for nanodevices.1-3 Tungsten (W), in particular, is of great interest, being promising [...]

Field Emission Properties of Carbon Nanotube Arrays with Defects and Impurities

Roy Mahapatra D., Sinha N., Melnik R., Yeow J.T.W., University of Waterloo, CA

Field emission from carbon nanotubes (CNTs) in the form of arrays or thin films give rise to several strongly correlated process of electromechanical interaction and degradation. Such processes are mainly due to (1) electron-phonon interaction [...]

High Current Cold Electron Source Based on Carbon Nanotube Field Emitters and Electron Multiplier Microchannel Plate

Raghunandan S., Choi W., Florida International University, US

Vacuum microelectronics has been studied for decades to develop unique devices such as rf-generators, high efficiency flat panel displays, x-ray sources and so on. In recent years field emitters based on carbon nanotubes (CNTs) and [...]