X-ray generation using carbon-nanofiber-based flexible field emitters

Abstract

Carbon nanofibers were grown on flexible polyimide substrates using an ion-beam sputtering technique. Field emission measurement showed a fairly low threshold voltage of 1.5V∕μm with a current density of 1μA∕cm2. The field enhancement factor was determined to be 4400. The emitter showed resilience when exploited as a high voltage electron source for x-ray generation. The x-ray generated by the flexible emitter is capable of delivering fine images of biological samples with superior sharpness, resolution, and contrast.

Highly flexible and robust N-doped SiC nanoneedle field emitters

“…[1][2][3][4] Among the emerging technologies, there is considerable interest in flexible field emission (FE) emitters due to their unique lightweight, conformable and flexible nature, which give them the significant advantage of being utilized in roll-up flexible FE displays, 3 e-papers 5 and high-performance X-ray tubes. 6 To enable such next-generation flexible devices, flexible cathodes must be used as the fundamental starting component to replace conventional emitters grown on rigid substrates. These flexible emitters should maintain their original or even better FE properties as well as excellent electrical and mechanical performances after bending, compressing, twisting and stretching.…”

Quantitative characterization of acidic groups on acid-treated multi-walled carbon nanotubes using 1-aminopyrene as a fluorescent probe

“…Carbon nanotubes (CNTs) are one of the most noteworthy materials for electronic, mechanical, and optical devices due to their unique structural and quantum characteristics [1][2][3][4][5][6][7][8][9]. Such carbon nanomaterials need to be functionalized on their surface in order to interact with other substances.…”

Fabrication of Ion-Induced Carbon Nanocomposite Fibres and their Application to Magnetic Force Microscope Probes

“…The investigations along these lines are now being undertaken. Besides the probe applications, ion-induced pristine and composite CNFs are applicable to field electron emission devices (Tanemura et al, 2005b;Tanemura et al, 2005c;Tan et al, 2006;Sim et al, 2007;Wang et al, 2009). In addition, by using the ion (a) (b) www.intechopen.com Advances in Nanocomposites -Synthesis, Characterization and Industrial Applications 832 irradiation method, ZnO based composite nanoneedles for ultra violet laser emission Tanemura et al, 2006c;Yang et al, 2006;Tanemura et al, 2007) and spintronics devices (Herng et al, 2007;Herng et al, 2009) can be fabricated.…”

“…This allows us a greater choice of substrates. In fact, densely distributed CNF-tipped cones www.intechopen.com Fabrication of Ion-Induced Carbon Nanocomposite Fibres and their Application to Magnetic Force Microscope Probes 819 grow also on carbon coated plastic substrates (Tanemura et al, 2006a;Tan et al, 2006;Sim et al, 2007). Another feature of ion-induced CNFs is that the higher ion-incidence angle (ion irradiation at oblique direction) produces CNFs of smaller diameter (Tanemura et al, 2005a;Yusop et al, 2010).…”