Recent Progress of Nanodiamond Film in Controllable Fabrication and Field Emission Properties

Abstract

The interest in the field electron emission cathode nanomaterials is on the rise due to the wide applications, such as electron sources, miniature X-ray devices, display materials, etc. In particular, nanodiamond (ND) film is regarded as an ideal next-generation cathode emitter in the field emission devices, due to the low or negative electron affinity, small grain size, high mechanical hardness, low work function, and high reliability. Increasing efforts are conducted on the investigation of the emission structures, manufacturing cost, and field emission properties improvement of the ND films. This review aims to summarize the recent research, highlight the new findings, and provide a roadmap for future developments in the area of ND film electron field emitter. Specially, the optimizing methods of large-scale, high-quality, and cost-effective synthesis of ND films are discussed to achieve more stable surface structure and optimal physical properties. Additionally, the mainstream strategies applied to produce high field emission performance of ND films are analyzed in detail, including regulating the grain size/boundary, hybrid phase carbon content, and doping element/type of ND films; meanwhile, the problems existing in the related research and the outlook in this area are also discussed.

Magnetic Resonance Study of Bulky CVD Diamond Disc

“…In many samples grown for both research and applications, relatively thin (up to tens of microns) CVD diamond films are considered [13][14][15][16][17][18][19][20][21][22][23][24]. In the future, a variety of optical, thermal, mechanical, and radiation sensor applications will require more substantial CVD diamonds [25][26][27][28][29][30][31][32]. It was of certain interest to probe the quality and defect structure of such material.…”

Dielectric multilayer cavity coupled metamaterial

“…They have been studied and applied in the field of nonlinear optics, ultrafast all-optical modulation, and scattering enhancement [11][12][13]. Integrating dielectric and plasmonic materials creates new opportunities for EM wave modulation [14].…”