Temperature effect on field emission properties and microstructures of polymer-based carbon films

Abstract

We investigated the field emission properties and resistivity of polymer-based carbon films prepared from poly ethyl-co-phenyl carbyne polymer precursors after treatment at different temperatures. As the heat-treatment temperature increased from 40to1200°C, the emission threshold field decreased from 12.4to2.1V∕μm, the emission current density increased from 0.1to6.1mA∕cm2, and the film resistivity decreased from 108to102Ωcm. The structural changes of the polymer films during the heat-treatment process were analyzed by Raman spectroscopy and atomic force microscopy. Raman analysis of these polymer-based carbon films suggests that the hydrogen content decreased while the sp2 carbon phase increased as the heat-treatment temperature increased. The dependence of the field emission properties of the polymer-based carbon films on the film structures (such as sp3, sp2 phases), film surface morphology and film resistivity is discussed. The enhancement of field emission from polymer-based carbon films was related to the increase of sp2∕sp3 ratio, film conductivity, and surface roughness with the heat-treatment temperature.

Noise Modeling in Field Emission and Evaluation of the Nano-Receiver in Terms of Temperature

“…This result is supported by the experiments using, for example, SiC@SiO 2 @graphene nanoarray emitters [35] and VO 2 (A) nanogap emitter [39]. It is also observed that the fluctuation in the current, namely, the noise component, also increases with the increase in temperature [35], [37].…”

“…In the past several decades, the general The associate editor coordinating the review of this manuscript and approving it for publication was Emrecan Demirors. theory has been discussed in the literatures, e.g., [31], [32], and experimental demonstrations have been provided for various types of emitters, including thermally grown SiO 2 emitters [33], carbon-based emitters [34]- [37], and W 18 O 49 nanowires [38]. As the temperature increases, the obtained current is enhanced.…”

Enhancement of electron field emission property with silver incorporation into diamondlike carbon matrix

“…Carey et al 21 and Guo et al 22 proposed that the presence of sp 2 clusters within the insulating sp 3 matrix could give rise to field enhancement in a-C films containing large defect densities ͑Ͼ10 19 cm −3 ͒. % in Ag:DLC films.…”

Hydrodechlorination of Silicon Tetrachloride to Trichlorosilane Over Ordered Mesoporous Carbon Catalysts: Effect of Pretreatment of Oxygen and Hydrochloric Acid

“…All catalysts display similar IR bands at ∼3520 cm −1 , ∼1490 cm −1 and ∼1135 cm −1 cm −1 , corresponding to O-H, C C and Si-O groups on the surface of OMC. [12][13][14][15] The appearance of OH and C C bonds confirms the nature of carbon. The origin of Si-O bond clearly suggests the formation of metal silicides over the surface of OMC catalyst.…”