Field Emission Properties of Hybrid Carbon Nanotube−ZnO Nanoparticles

Abstract

ZnO nanoparticles are uniformly coated on the walls of carbon nanotubes (CNTs) via a straightforward process, and the particle size and interparticle distance can be controlled by coating time. The appropriate amount of coated nanoparticles effectively reduces the formation of various structural defects induced by oxygen or hydrogen atoms on the walls of CNTs, which can be evaluated through a decrease in the intensity ratio of disorder graphitic band (D peak) over graphitic C-C stretching band (G peak) in the Raman spectrum. An overincrease in coating time simultaneously causes an increase in interstitial zinc and oxygen vacancies in ZnO. The high local electric field around the ZnO particle on the walls of CNTs can increase the tunneling probability at CNTs-ZnO heterojunction, significantly enhancing the field emission property for CNTs.

Enhanced field emission and photocatalytic performance of MoS2 titania nanoheterojunctions via two synthetic approaches

“…Furthermore, the local field strength predominates, and the emission current on top of the nanoparticles becomes stronger than that on the single MoS 2 petal, making it easier to emit to the vacuum. 28 Based on this theory, the vast distribution of nanoparticles can be considered as an effective coupling method in field emission material synthesis.…”

Effect of sulfur sources on the crystal structure, morphology and luminescence of CdS nanocrystals prepared by a solvothermal method

“…Synthesis of nanoscale inorganic crystals with controlled size, shape, and dimension has attracted intensive research interest, since they are potential building blocks for advanced materials and optoelectronic devices [1]. The fabrication of semiconducting metal sulfide nanostructures has been paid much attention in the past decades because of their unusual optical and electric properties and potential applications in nanodevices [2,3].…”

Field Emission Characteristics of SnO2/CNTs Composites Prepared by Microwave‐Assisted Wet Impregnation

“…The higher β values for the composite samples when compared to pure CNTs are attributed to the presence of spherical SnO 2 nanoparticles which act as additional independent emission centers other than the CNT tips. Ho et al recently reported similar observations on ZnO/CNT hybrids with different ZnO layer density [29]. The SnO 2 /CNT composite from the microwave assisted wet impregnation method shows significantly enhanced FE when compared to its counterpart from conventional method which may be due to the increased number of SnO 2 nanoparticles that contributes to the local field strengthening and emission current.…”