Journal ArticleDOI
High-throughput solution processing of large-scale graphene
Reads0
Chats0
TLDR
The chemically converted graphene sheets that were produced have the largest area reported to date (up to 20 x 40 microm), making them far easier to process, and field-effect devices have been fabricated by conventional photolithography, displaying currents that are three orders of magnitude higher than previously reported for chemically produced graphene.Abstract:
The electronic properties of graphene, such as high charge carrier concentrations and mobilities, make it a promising candidate for next-generation nanoelectronic devices. In particular, electrons and holes can undergo ballistic transport on the sub-micrometre scale in graphene and do not suffer from the scale limitations of current MOSFET technologies. However, it is still difficult to produce single-layer samples of graphene and bulk processing has not yet been achieved, despite strenuous efforts to develop a scalable production method. Here, we report a versatile solution-based process for the large-scale production of single-layer chemically converted graphene over the entire area of a silicon/SiO(2) wafer. By dispersing graphite oxide paper in pure hydrazine we were able to remove oxygen functionalities and restore the planar geometry of the single sheets. The chemically converted graphene sheets that were produced have the largest area reported to date (up to 20 x 40 microm), making them far easier to process. Field-effect devices have been fabricated by conventional photolithography, displaying currents that are three orders of magnitude higher than previously reported for chemically produced graphene. The size of these sheets enables a wide range of characterization techniques, including optical microscopy, scanning electron microscopy and atomic force microscopy, to be performed on the same specimen.read more
Citations
More filters
Journal ArticleDOI
Stimuli-responsive polymer hydrogels containing partially exfoliated graphite
Valeria Alzari,Alberto Mariani,Orietta Monticelli,Luca Valentini,Daniele Nuvoli,Massimo Piccinini,Sergio Scognamillo,Silvia Bittolo Bon,Javier Illescas +8 more
TL;DR: In this article, a stimuli-responsive composite polymer hydrogel containing partially exfoliated graphite was prepared by frontal polymerization, and the materials obtained were characterized by differential scanning calorimetry, RAMAN, scan electron microscopy, transmission electron microscope, atomic force microscopy and in terms of swelling behavior.
Journal ArticleDOI
Surface grafting of reduced graphene oxide using nanocrystalline cellulose via click reaction
TL;DR: In this article, a reduced graphene oxide (RGO) sheet was functionalized with nanocrystalline cellulose (NCC) via click coupling between azide-functionalized graphene oxide and terminal propargyl functionalized nanocrystine celluloses (PG-NCC), which was confirmed by Fourier transform infrared, Raman, DEPT135, and 13 C NMR spectroscopy.
Journal ArticleDOI
Fabrication of Fe3O4@graphene oxide core-shell nanospheres for ferrofluid-based dispersive solid phase extraction as exemplified for Cd(II) as a model analyte
TL;DR: In this article, the synthesis of core-shell structured Fe3O4@graphene oxide nanospheres (denoted as Fe3 o4@GO NSs) via a chemical (covalent) bonding method was described.
Journal ArticleDOI
Graphene Oxide Hybrid with Sulfur–Nitrogen Polymer for High-Performance Pseudocapacitors
Samanta Witomska,Zhaoyang Liu,Włodzimierz Czepa,Alessandro Aliprandi,Dawid Pakulski,Dawid Pakulski,Piotr Pawluć,Artur Ciesielski,Artur Ciesielski,Paolo Samorì +9 more
TL;DR: Graphene oxide is covalently functionalized with a redox active thiourea-formaldehyde polymer, yielding a multifunctional hybrid system that exhibited specific capacitance as high as 400 F g-1, areal capacitance of 160 mF cm-2, and an energy density of 11.1 mWh cm-3.
Journal ArticleDOI
Design and operation of silver nanowire based flexible and stretchable touch sensors
TL;DR: In this article, the authors report flexible and stretchable touch sensors with two different patterns (interdigitated and diamond-shaped capacitors) made of screen-printed silver nanowire electrodes embedded in polydimethylsiloxane.
References
More filters
Journal ArticleDOI
The electronic properties of graphene
TL;DR: In this paper, the basic theoretical aspects of graphene, a one-atom-thick allotrope of carbon, with unusual two-dimensional Dirac-like electronic excitations, are discussed.
Journal ArticleDOI
Raman spectrum of graphene and graphene layers.
Andrea C. Ferrari,Jannik C. Meyer,Vittorio Scardaci,Cinzia Casiraghi,Michele Lazzeri,Francesco Mauri,S. Piscanec,Da Jiang,K. S. Novoselov,S. Roth,A. K. Geim +10 more
TL;DR: This work shows that graphene's electronic structure is captured in its Raman spectrum that clearly evolves with the number of layers, and allows unambiguous, high-throughput, nondestructive identification of graphene layers, which is critically lacking in this emerging research area.
Journal ArticleDOI
Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide
Sasha Stankovich,Dmitriy A. Dikin,Richard D. Piner,Kevin A. Kohlhaas,Alfred Kleinhammes,Yuanyuan Jia,Yue Wu,SonBinh T. Nguyen,Rodney S. Ruoff +8 more
TL;DR: In this paper, a colloidal suspension of exfoliated graphene oxide sheets in water with hydrazine hydrate results in their aggregation and subsequent formation of a high surface area carbon material which consists of thin graphene-based sheets.
Journal ArticleDOI
Two-dimensional atomic crystals
Kostya S. Novoselov,Da Jiang,Fred Schedin,Timothy J. Booth,V. V. Khotkevich,Sergey V. Morozov,Andre K. Geim +6 more
TL;DR: By using micromechanical cleavage, a variety of 2D crystals including single layers of boron nitride, graphite, several dichalcogenides, and complex oxides are prepared and studied.