Graphene synthesis by chemical vapor deposition and transfer by a roll-to-roll process

Abstract

We synthesized centimeter-scale single-to few-layer graphene (FLG) films via chemical vapor deposition (CVD) on Ni foils. We demonstrates that the precipitation mechanism may not be the only important mechanism in the formation of graphene by CVD in Ni system, and that controlling the cooling rate in the CVD process may not be the appropriate way to control the thickness of graphene films. In addition, we are the first to demonstrate the transfer of centimeter-scale FLG from Ni foil to transparent flexible polyethylene terephthalate substrates via an efficient roll-to-roll process. Comparing to rigid substrates, synthesis of graphene on flexible Ni foil has necessity for the use of a roll-to-roll transfer process.

Configuration-enriched magneto-electronic spectra of AAB-stacked trilayer graphene

“…The essential electronic properties can be drastically changed by the layer number [35][36][37], stacking configuration [37][38][39][40][41][42], magnetic field [43,44], electric field [45][46][47], dopping [48,49], mechanical strain [50][51][52], and temperature variation [53,54]. Few-and multi-layer graphenes have been successfully produced by experimental methods such as exfoliation of highly orientated pyrolytic graphite [55][56][57][58], metalorganic chemical vapour deposition (MOCVD) [61][62][63][64][65][66], chemical and electrochemical reduction of graphene oxide [67][68][69], and arc discharge [70,71]. There exist important stacking configurations, including AAB [57,58,69], ABC [59,60,[66][67][68][69], AAA …”

“…Few-and multi-layer graphenes have been successfully produced by experimental methods such as exfoliation of highly orientated pyrolytic graphite [55][56][57][58], metalorganic chemical vapour deposition (MOCVD) [61][62][63][64][65][66], chemical and electrochemical reduction of graphene oxide [67][68][69], and arc discharge [70,71]. There exist important stacking configurations, including AAB [57,58,69], ABC [59,60,[66][67][68][69], AAA [62,63], ABA [60,61,66,69], and twisted [62,69] and turbostratic ones [64]. The interlayer atomic interactions and stacking configurations induce the rich electronic properties of graphene.…”

Recent Advances in Graphene Based TiO2 Nanocomposites (GTiO2Ns) for Photocatalytic Degradation of Synthetic Dyes

“…Of these substances, synthetic dyes represent a large group and therefore deserve particular attention, due to the high quantity-more than 800,000 tons-that is produced annually worldwide [3]. About one third of these is released into receiving waters every year through industrial wastewater discharges [4], which may have a severe influence on both the environment In the bottom-up growth of graphene sheets (Table 1), the synthesis of graphene [70] can be obtained via epitaxial growth [71][72][73], chemical vapor deposition (CVD) [74][75][76][77][78][79][80][81][82], electrochemical reduction of CO and CO2 [83,84], arc discharge [85,86], unzipping carbon nanotubes [70,87], organic synthesis [88], and pyrolysis [89][90][91].…”

“…Much interest is directed at the study of proceedings to obtain graphene in the form of highly reduced graphene oxide (rGO) [114,115] or chemically modified graphene [116,117] from the oxidation and exfoliation of graphite and successive chemical reduction. Two methods to shape and transfer films to specific substrates [79] Monolayer G films on SiC(0001) Ex-situ graphitization in argon atmosphere [80] Centimeter-scale single-to few-layer G on Ni foils Efficient roll-to-roll process [81] -N-doped graphene N-type behavior useful to modulate G electrical properties [82] Electrochemical reduction of CO and CO 2 Several types of nanocarbons of controlled shape Direct reaction of CO 2 with Mg metal [83] -G flakes Room-temperature synthesis method on copper foil from different carbon sources using external charges [84] Arc discharge -Few-layered G The reactivity of buffer gases (helium, oxygen-helium, and hydrogen-helium) is the key factor [85] Few-layered G Different mechanisms in the presence and absence of TiO 2 and ZnO catalysts [86] Unzipping carbon-nanotubes (CNT) -Chemical-free G Radial and shear loading unzipping modes with cryomill method at 150 K [70] -G nanoribbons Linear longitudinal opening of the Multi Wall CNT (MWCNT) [87] Organic synthesis -Two-dimensional G nanoribbons…”

Synthesis of Graphene on Ni/SiC Structure

“…Currently, graphene can be prepared by different methods such as mechanical cleavage or exfoliation [2], chemical reduction of graphite oxide [3], epitaxial growth by SiC thermal graphitization in vacuum [4] or in an Ar atmosphere [5] and chemical vapour deposition (CVD) on transition metals [6]. Very promising is the synthesis of graphene on SiC substrates at a relatively low temperature [7] based on the carbon segregation from a metal layer saturated by carbon.…”