A direct transfer of layer-area graphene

Regan, William; Alem, Nasim; Alemán, Benjamín; Geng, Baisong; Girit, Çaǧlar; Maserati, Lorenzo; Wang, Feng; Crommie, Michael F.; Zettl, A.

doi:10.1063/1.3337091

Cited by 363 publications

(350 citation statements)

References 14 publications

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“…The thickness of the BN nanosheet was determined to be 7-8 nm (~20 layers) by atomic force microscopy (AFM) after a transfer to a silicon substrate with a 90 nm oxide layer (SiO 2 /Si) (see Supporting Information, Figure S1). [28] Thanks to BN's low absorption of visible light, the BN-covered Cu foil has a very similar metallic color to the bare Cu foil, as…”

Section: Resultsmentioning

confidence: 99%

Boron Nitride Nanosheets for Metal Protection

Tan

Chen

et al. 2014

Adv Materials Inter

164

121

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Although the high impermeability of graphene makes it an excellent barrier to inhibit metal oxidation and corrosion, graphene can form a galvanic cell with the underlying metal that promotes corrosion of the metal in the long term. Boron nitride (BN) nanosheets which have a similar impermeability could be a better choice as protective barrier, because they are more thermally and chemically stable than graphene and, more importantly, do not cause galvanic corrosion due to their electrical insulation. In this study, the performance of commercially

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Section: Resultsmentioning

confidence: 99%

Boron Nitride Nanosheets for Metal Protection

Tan

Chen

et al. 2014

Adv Materials Inter

164

121

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“…Using a direct transfer method 53 , the GO sheets were transferred onto Quantifoil TEM grids. However, after the transfer process onto a TEM grid, we frequently observed the formation of B10-100-nmsized holes in the GO sheets.…”

Section: Methodsmentioning

confidence: 99%

Monolithic graphene oxide sheets with controllable composition

et al. 2014

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Graphene oxide potentially has multiple applications and is typically prepared by solutionbased chemical means. To date, the synthesis of a monolithic form of graphene oxide that is crucial to the precision assembly of graphene-based devices has not been achieved. Here we report the physical approach to produce monolithic graphene oxide sheets on copper foil using solid carbon, with tunable oxygen-to-carbon composition. Experimental and theoretical studies show that the copper foil provides an effective pathway for carbon diffusion, trapping the oxygen species dissolved in copper and enabling the formation of monolithic graphene oxide sheets. Unlike chemically derived graphene oxide, the as-synthesized graphene oxide sheets are electrically active, and the oxygen-to-carbon composition can be tuned during the synthesis process. As a result, the resulting graphene oxide sheets exhibit tunable bandgap energy and electronic properties. Our solution-free, physical approach may provide a path to a new class of monolithic, two-dimensional chemically modified carbon sheets.

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“…To prepare for the TEM samples, few-layer BN sheets exfoliated on SiO2/Si substrate were transferred onto Ni TEM grid with carbon film, using the process described in Ref [40]. The pentacene crystalline films were grown for 3 hours under the source temperature of 160°C, which ~5-10 layers were typically produced.…”

Section: Details Of Afm Tem Raman Polarization-dependent Absorptiomentioning

confidence: 99%

Probing Carrier Transport and Structure-Property Relationship of Highly Ordered Organic Semiconductors at the Two-Dimensional Limit

et al. 2016

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One of the basic assumptions in organic field-effect transistors, the most fundamental device unit in organic electronics, is that charge transport occurs two-dimensionally in the first few molecular layers near the dielectric interface.Although the mobility of bulk organic semiconductors has increased dramatically, direct probing of intrinsic charge transport in the two-dimensional limit has not been possible due to excessive disorders and traps in ultrathin organic thin films. Here, highly ordered mono-to tetra-layer pentacene crystals are realized by van der Waals (vdW) epitaxy on hexagonal BN. We find that the charge transport is dominated by hopping in the first conductive layer, but transforms to band-like in subsequent layers.Such abrupt phase transition is attributed to strong modulation of the molecular packing by interfacial vdW interactions, as corroborated by quantitative structural characterization and density functional theory calculations. The structural modulation becomes negligible beyond the second conductive layer, leading to a mobility saturation thickness of only ~3nm. Highly ordered organic ultrathin films provide a platform for new physics and device structures (such as heterostructures and quantum wells) that are not possible in conventional bulk crystals. 3Organic field-effect transistors (OFETs) offer unique advantages of low cost, lightweight and flexibility and are widely used in electronics and display industry.While the mobility of bulk organic semiconductors has increased dramatically [1][2][3], an outstanding issue is to directly examine the structure-property relationship at the semiconductor-dielectric interface [4], where charge transport actually occurs [5][6][7].Ultrathin organic semiconductors down to few-nanometre thickness are often dominated by traps and disorders and far away from intrinsic transport regime [8][9][10].Another challenge in organic electronics is the development of layer-by-layer epitaxy with the precision similar to molecular beam epitaxy in their inorganic counterparts [11]. These challenges may be alleviated if molecular crystals are processed into large-area, highly crystalline monolayers. Such 2D form factor will also bring about new applications such as nanoporous membranes and insulating dielectrics [12,13].Several recent breakthroughs in various types of 2D organic materials such as polymers [14,15], oligomers [16] and covalent organic frameworks [17] have already shown great promises along this direction. However, one of the most fundamental questions regarding the nature of charge transport at the 2D limit has not been addressed. In this work, we study the benchmark molecule pentacene epitaxially crystallized on BN substrate because of its high mobility and simple structure to model. The highly clean system allows us to provide the first definitive scenario of how molecular packing and charge transport are modulated near the interface, without being dominated by extrinsic factors. Our results suggest the possibility of band-like transport...

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A direct transfer of layer-area graphene

Cited by 363 publications

References 14 publications

Boron Nitride Nanosheets for Metal Protection

Boron Nitride Nanosheets for Metal Protection

Monolithic graphene oxide sheets with controllable composition

Probing Carrier Transport and Structure-Property Relationship of Highly Ordered Organic Semiconductors at the Two-Dimensional Limit

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