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Showing 13 to 24 of 289 entries
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Oxygen-activated growth and bandgap tunability of large single-crystal bilayer graphene.

Nature nanotechnology

Hao Y, Wang L, Liu Y, Chen H, Wang X, Tan C, Nie S, Suk JW, Jiang T, Liang T, Xiao J, Ye W, Dean CR, Yakobson BI, McCarty KF, Kim P, Hone J, Colombo L, Ruoff RS.
PMID: 26828845
Nat Nanotechnol. 2016 May;11(5):426-31. doi: 10.1038/nnano.2015.322. Epub 2016 Feb 01.

Bernal (AB)-stacked bilayer graphene (BLG) is a semiconductor whose bandgap can be tuned by a transverse electric field, making it a unique material for a number of electronic and photonic devices. A scalable approach to synthesize high-quality BLG is...

An Observational Study on the Use of IV Iron Sucrose Among Anaemic Pregnant Women in Government Healthcare Facilities from Two States of India.

Journal of obstetrics and gynaecology of India

Devasenapathy N, Singh R, Moodbidri P, Bhushan H, Gupta S, Zodpey SP, Neogi SB.
PMID: 26243988
J Obstet Gynaecol India. 2015 Jul;65(4):230-5. doi: 10.1007/s13224-014-0588-2. Epub 2014 Jul 10.

BACKGROUND/PURPOSE OF THE STUDY: In India oral iron tablets for anaemia have been distributed through the health system since many years, but there has been no significant change in the burden of anaemia. The objective of the present study...

Breaking of symmetry in graphene growth on metal substrates.

Physical review letters

Artyukhov VI, Hao Y, Ruoff RS, Yakobson BI.
PMID: 25839288
Phys Rev Lett. 2015 Mar 20;114(11):115502. doi: 10.1103/PhysRevLett.114.115502. Epub 2015 Mar 16.

In graphene growth, island symmetry can become lower than the intrinsic symmetries of both graphene and the substrate. First-principles calculations and Monte Carlo modeling explain the shapes observed in our experiments and earlier studies for various metal surface symmetries....

Continuous Carbon Nanotube-Ultrathin Graphite Hybrid Foams for Increased Thermal Conductivity and Suppressed Subcooling in Composite Phase Change Materials.

ACS nano

Kholmanov I, Kim J, Ou E, Ruoff RS, Shi L.
PMID: 26529570
ACS Nano. 2015 Dec 22;9(12):11699-707. doi: 10.1021/acsnano.5b02917. Epub 2015 Nov 09.

Continuous ultrathin graphite foams (UGFs) have been actively researched recently to obtain composite materials with increased thermal conductivities. However, the large pore size of these graphitic foams has resulted in large thermal resistance values for heat conduction from inside...

Large arrays and properties of 3-terminal graphene nanoelectromechanical switches.

Advanced materials (Deerfield Beach, Fla.)

Liu X, Suk JW, Boddeti NG, Cantley L, Wang L, Gray JM, Hall HJ, Bright VM, Rogers CT, Dunn ML, Ruoff RS, Bunch JS.
PMID: 24339026
Adv Mater. 2014 Mar 12;26(10):1571-6. doi: 10.1002/adma.201304949. Epub 2013 Dec 12.

Large arrays of 3-terminal nanoelectromechanical graphene switches are fabricated. The switch is designed with a novel geometry that leads to low actuation voltages and improved mechanical integrity, while reducing adhesion forces, which improves the reliability of the switch. A...

Preparation and characterization of graphene oxide paper.

Nature

Dikin DA, Stankovich S, Zimney EJ, Piner RD, Dommett GH, Evmenenko G, Nguyen ST, Ruoff RS.
PMID: 17653188
Nature. 2007 Jul 26;448(7152):457-60. doi: 10.1038/nature06016.

Free-standing paper-like or foil-like materials are an integral part of our technological society. Their uses include protective layers, chemical filters, components of electrical batteries or supercapacitors, adhesive layers, electronic or optoelectronic components, and molecular storage. Inorganic 'paper-like' materials based...

Graphene-based composite materials.

Nature

Stankovich S, Dikin DA, Dommett GH, Kohlhaas KM, Zimney EJ, Stach EA, Piner RD, Nguyen ST, Ruoff RS.
PMID: 16855586
Nature. 2006 Jul 20;442(7100):282-6. doi: 10.1038/nature04969.

Graphene sheets--one-atom-thick two-dimensional layers of sp2-bonded carbon--are predicted to have a range of unusual properties. Their thermal conductivity and mechanical stiffness may rival the remarkable in-plane values for graphite (approximately 3,000 W m(-1) K(-1) and 1,060 GPa, respectively); their...

Optical performance monitoring in coherent optical OFDM systems.

Optics express

Shieh W, Tucker RS, Chen W, Yi X, Pendock G.
PMID: 19532250
Opt Express. 2007 Jan 22;15(2):350-6. doi: 10.1364/oe.15.000350.

Optical performance monitoring is an indispensable feature for optical systems and networks. In this paper, we propose the concept of optical performance monitoring through channel estimation by receiver signal processing. We show that in coherent-optical-orthogonal-frequency-division- multiplexed (CO-OFDM) systems, critical...

Epoxide reduction with hydrazine on graphene: a first principles study.

The Journal of chemical physics

Kim MC, Hwang GS, Ruoff RS.
PMID: 19691400
J Chem Phys. 2009 Aug 14;131(6):064704. doi: 10.1063/1.3197007.

Mechanisms for epoxide reduction with hydrazine on a single-layer graphene sheet are examined using quantum mechanical calculations within the framework of gradient-corrected spin-polarized density-functional theory. We find that the reduction reaction is mainly governed by epoxide ring opening which...

High on-off conductance switching ratio in optically-driven self-assembled conjugated molecular systems.

ACS nano

Smaali K, Lenfant S, Karpe S, Oçafrain M, Blanchard P, Deresmes D, Godey S, Rochefort A, Roncali J, Vuillaume D.
PMID: 20349942
ACS Nano. 2010 Apr 27;4(4):2411-21. doi: 10.1021/nn100295x.

A new azobenzene-thiophene molecular switch is designed, synthesized, and used to form self-assembled monolayers (SAM) on gold. An "on/off" conductance ratio up to 7 x 10(3) (with an average value of 1.5 x 10(3)) is reported. The "on" conductance...

Sample size and power analysis in medical research.

Indian journal of dermatology, venereology and leprology

Zodpey SP.
PMID: 17642587
Indian J Dermatol Venereol Leprol. 2004 Mar-Apr;70(2):123-8.

Among the questions that a researcher should ask when planning a study is "How large a sample do I need?" If the sample size is too small, even a well conducted study may fail to answer its research question,...

Graphene growth using a solid carbon feedstock and hydrogen.

ACS nano

Ji H, Hao Y, Ren Y, Charlton M, Lee WH, Wu Q, Li H, Zhu Y, Wu Y, Piner R, Ruoff RS.
PMID: 21879747
ACS Nano. 2011 Sep 27;5(9):7656-61. doi: 10.1021/nn202802x. Epub 2011 Aug 31.

Graphene has been grown on Cu at elevated temperatures with different carbon sources (gaseous hydrocarbons and solids such as polymers); however the detailed chemistry occurring at the Cu surface is not yet known. Here, we explored the possibility of...

Showing 13 to 24 of 289 entries