Abstract
In this work a hybrid structure assembly of amorphous carbon nanotubes (a-CNTs) -reduced graphene oxide (RGO) has been fabricated on carbon cloth/PET substrates for enhanced edge effect assisted flexible field emission device application. The carbon nanostructures prepared by chemical processes were finally deposited one over the other by a simple electrophoretic deposition (EPD) method on carbon cloth (CC) fabric. The thin films were then characterized by X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscope (HRTEM). Field assisted electron emission measurement was performed on this hybrid structure. It was observed that the hybrid carbon nanostructure showed exceptional field emission properties with outstanding low turn-on and threshold field (Eto∼ 0.26 Vμm−1, Eth ∼ 0.55 Vμm1). These observed results are far better compared to standalone and plasma etched edge enhanced RGO systems due to the bottom layer a-CNTs bed which assisted in significant enhancement of edge effect in RGO sheets.
Highlights
Since the advent of the 2D carbon nanostructure i.e. graphene in 2004, nanotechnology has flourished rapidly under its wing mainly attributed to its unique electronic and mechanical properties.[1,2,3] The diaspora of research has been as diverse and enriching as the material itself
Earlier we have successfully reported the field emission of reduced graphene oxide (RGO) and plasma etched RGO over carbon cloth with low turn-on field.25–27Although etching might work for a singular RGO system; it is deterrent when considered for a hybrid system like in this present work
Pure amorphous carbon nanotubes (a-CNTs) were synthesized using a mixture of ferrocene and ammonium chloride taken in 1:2 weight ratios that were mixed in a mortar finely
Summary
A-CNTs morphology gets affected due to etching and the residual secondary field emission from the tips will not be accumulated in the quest for overall improvement of field emission properties For this reason here we have taken a dual carbon hybrid system into consideration and tried to increase the edge effect of RGO through bed layer a-CNT morphological distortion which substitutes itself as a partial secondary emitter by exclusively pursuing a non-etchant enhanced field emission route. The selection of carbon cloth fiber substrate as a bed to the composite layer has been chosen due to its superior conductivity and flexibility that it provides.[27,28] The additional support of the PET back cover was added to ensure providing more stability and robustness to the flexible thin film device structure This hybrid structure is expected to show better field emission which could prove to have potential impact for upcoming flexible device applications
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