Synthesis of Diamond-like Carbon as a Dielectric Platform for Graphene Field Effect Transistors

Abstract

The platform for supporting two-dimensional (2D) materials such as graphene has a critical influence on the electronic properties of the materials it supports. Here we report on the filtered cathodic vacuum arc deposition (FCVAD) of atomically flat diamond-like carbon (DLC) films with varied C sp 3 /sp 2 content ratio by modulating the parameters of substrate bias voltage, then used as a dielectric platform for supporting graphene. By doing this, an all-carbon DLC−graphene heterostructure would be formed. Through characterizing this heterostructure and constructing graphene field effect transistors (FETs) on DLC, it was shown that graphene on DLC platforms had less doping from the substrate and improved FET carrier mobility compared with that of graphene on SiO 2 /Si substrate. Moreover, the graphene on different DLC platforms exhibited an increased FET mobility (up to ∼7032 and 5558 cm −2 V −1 s −1 for hole and electron, respectively) with the increase of C sp 3 /sp 2 bond fraction in DLC which could be tuned by the negative bias voltage applied to the deposited substrates in the FCVAD synthesis of DLC here.

Enhanced Thermopower of Saturated Molecules by Noncovalent Anchor‐Induced Electron Doping of Single‐Layer Graphene Electrode

“…Examples of such cases include the formation of crystal defects, [ 71–73 ] increase in strain, [ 74–76 ] doping induced by chemi‐/physisorption. [ 69,77–80 ]…”

“…Examples of such cases include the formation of crystal defects, [71][72][73] increase in strain, [74][75][76] doping induced by chemi-/physisorption. [69,[77][78][79][80] In our physisorption, the nitrogen atom of the amine group (NH 2 ) in H 2 NC n interacts with the carbon atoms that form the SLG to generate new in-gap states. We conducted ab initio calculations to examine the creation of such energy states upon physisorption of the amine molecules on SLG, and what factors do and do not influence the states.…”

Mixed sp2–sp3 Nanocarbon Materials: A Status Quo Review

“…Diamond-like films, obtained by the cathodic vacuum arc deposition method, were used as a dielectric platform to support GN [126]. The GN deposited on these films revealed improved FET carrier mobility compared with GN on SiO 2 /Si substrate due to the significant suppression of the doping.…”

Paper-Based Point-of-Care Testing of SARS-CoV-2

“…Finally, in recent years there have been many reports of using 2D nanomaterials for ultrasensitive diagnosis of diseases ( Zhu et al, 2015 ). Due to its excellent intrinsic electrical and mechanical properties ( Hao et al, 2018 ; Wang C. et al, 2020 ), graphene has emerged as the most promising functional material ( Luo et al, 2021 ). To data, graphene-based biosensors have been reported to detect a wide range of biomolecules including nucleic acids ( Wang et al, 2019a ), proteins ( Tang et al, 2018 ; Hao Z. et al, 2019 ), and small molecules ( Wang et al, 2019b ; Li et al, 2019c ).…”