The Anistropy of Field Effect Mobility of CVD Graphene Grown on Copper Foil

Zhang, Dayong; Jin, Zhi; Shi, Jingyuan; Ma, P.; Peng, Songang; Liu, Xinyu; Ye, Tianchun

doi:10.1002/smll.201303195

Cited by 28 publications

(22 citation statements)

References 49 publications

(21 reference statements)

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“…Hence, two types of surface roughness are ubiquitous: growth induced wrinkles, and transfer induced nanoripples . Graphene wrinkles can degrade mobility and result in anisotropic electrical transport . Hence, smoothing out graphene wrinkles to fabricate the ultraflat samples are highly required for improving the electrical performance.…”

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confidence: 99%

Anisotropic Strain Relaxation of Graphene by Corrugation on Copper Crystal Surfaces

Deng

Zhang

et al. 2018

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Corrugation is a ubiquitous phenomenon for graphene grown on metal substrates by chemical vapor deposition, which greatly affects the electrical, mechanical, and chemical properties. Recent years have witnessed great progress in controlled growth of large graphene single crystals; however, the issue of surface roughness is far from being addressed. Here, the corrugation at the interface of copper (Cu) and graphene, including Cu step bunches (CuSB) and graphene wrinkles, are investigated and ascribed to the anisotropic strain relaxation. It is found that the corrugation is strongly dependent on Cu crystallographic orientations, specifically, the packed density and anisotropic atomic configuration. Dense Cu step bunches are prone to form on loose packed faces due to the instability of surface dynamics. On an anisotropic Cu crystal surface, Cu step bunches and graphene wrinkles are formed in two perpendicular directions to release the anisotropic interfacial stress, as revealed by morphology imaging and vibrational analysis. Cu(111) is a suitable crystal face for growth of ultraflat graphene with roughness as low as 0.20 nm. It is believed the findings will contribute to clarifying the interplay between graphene and Cu crystal faces, and reducing surface roughness of graphene by engineering the crystallographic orientation of Cu substrates.

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confidence: 99%

Anisotropic Strain Relaxation of Graphene by Corrugation on Copper Crystal Surfaces

Deng

Zhang

et al. 2018

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“…Therefore, single cell isolation and analysis is not necessarily the key to understanding distinct stem cells but appreciation for the population as a whole, which reflects the existence of multiple cells within tissues. Advancement of cell culture approaches has led to studying the effects of mechanical stress, changes in substrate geometries and microfluidics to predict stem cell orientation and engraftment of delivered cells [75-77]. Stretch-activated channels on the cell surface allow for influx of calcium known to regulate stem cell behavior as seen with cyclic stretch of human CPCs leading to a decrease in proliferation and increase in growth and expression of cardiomyogenic markers [76,78].…”

Section: Myocardial Mechanical Stress To Impact Stem Cell Engraftmentmentioning

confidence: 99%

Making it stick: chasing the optimal stem cells for cardiac regeneration

Quijada

Sussman²

2014

Expert Review of Cardiovascular Therapy

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Despite the increasing use of stem cells for regenerative-based cardiac therapy, the optimal stem cell population(s) remains in a cloud of uncertainty. In the past decade, the field has witnessed a surge of researchers discovering stem cell populations reported to directly and/or indirectly contribute to cardiac regeneration through processes of cardiomyogenic commitment and/or release of cardioprotective paracrine factors. This review centers upon defining basic biological characteristics of stem cells used for sustaining cardiac integrity during disease and maintenance of communication between the cardiac environment and stem cells. Given the limited successes achieved so far in regenerative therapy, the future requires development of unprecedented concepts involving combinatorial approaches to create and deliver the optimal stem cell(s) that will enhance myocardial healing.

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“…20 The earlier investigations on electrical characterization of wrinkled graphene were performed using two and four terminal measurements involving contact fabrication processes which might contribute to unwanted contamination to the samples thereby making the interprepation of transport data non-trivial. 16,17,21 Therefore, it is most important to synthesize and characterize large area graphene films by clean methods free from chemical processing of the surface. Here, we use Conductive Atomic Force Microscopy (CAFM) and Kelvin Probe Force Microscopy (KPFM) to locally map the graphene samples directly grown on nickel foils.…”

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confidence: 99%

Enhanced electrical transport through wrinkles in turbostratic graphene films

Moun,

Vasdev,

Pujar

et al. 2021

Preprint

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Formation of wrinkles is a common phenomenon in the large area growth of two dimensional layered materials on metallic substrates. Wrinkles can significantly affect the working of 2D materials based large scale electronic devices and therefore, it is of utmost importance to investigate local electrical properties of such wrinkled/folded structures on 2D materials. Here, we report local conductivity measurements by conducting atomic force microscopy (CAFM) and surface potential mapping by Kelvin Probe Force microscopy (KPFM) on large area wrinkled turbostratic graphene films grown on nickel foils. We show that the electrical transport current is several orders of magnitude higher on the wrinkles than that on the flat regions of the graphene films. Therefore, our results suggest that controlled engineering of such wrinkles on graphene may facilitate development of superior graphene-based nano-electronic devices where transport of high current through narrow channels are desired.

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The Anistropy of Field Effect Mobility of CVD Graphene Grown on Copper Foil

Cited by 28 publications

References 49 publications

Anisotropic Strain Relaxation of Graphene by Corrugation on Copper Crystal Surfaces

Anisotropic Strain Relaxation of Graphene by Corrugation on Copper Crystal Surfaces

Making it stick: chasing the optimal stem cells for cardiac regeneration

Enhanced electrical transport through wrinkles in turbostratic graphene films

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