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Carbon nanotube field effect transistors with suspended graphene gates.
Svensson, Johannes,Lindahl, Niklas,Yun, Hoyeol,Seo, Miri,Midtvedt, Daniel,Tarakanov, Yury,Lindvall, Niclas,Nerushev, Oleg,Kinaret, Jari,Lee, Sangwook,Campbell, Eleanor E B American Chemical Society 2011 Nano letters Vol.11 No.9
<P>Novel field effect transistors with suspended graphene gates are demonstrated. By incorporating mechanical motion of the gate electrode, it is possible to improve the switching characteristics compared to a static gate, as shown by a combination of experimental measurements and numerical simulations. The mechanical motion of the graphene gate is confirmed by using atomic force microscopy to directly measure the electrostatic deflection. The device geometry investigated here can also provide a sensitive measurement technique for detecting high-frequency motion of suspended membranes as required, e.g., for mass sensing.</P>
Super-atom molecular orbital excited states of fullerenes
Johansson, J. Olof,Bohl, Elvira,Campbell, Eleanor E. B. Royal Society 2016 Philosophical transactions. Series A, Mathematical Vol.374 No.2076
<P>This article is part of the themed issue 'Fullerenes: past, present and future, celebrating the 30th anniversary of Buckminster Fullerene'.</P>
Direct grafting of carbon nanotubes with ethylenediamine
Gromov, Andrei V.,Gray, Nia,Szilá,gyi, Petra Á,gota,Campbell, Eleanor E. B. The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.39
<P>Singlewall and multiwall carbon nanotubes were covalently functionalised with ethylenediamine (EDA) in a simple one-pot process providing a good surface coverage. The successful grafting of EDA on carbon nanotubes (CNTs) was shown by X-ray photoelectron spectroscopy (XPS), infrared and Raman spectroscopies and thermogravimetric analysis (TGA). These functionalised CNTs with terminal amino groups were shown to form composite polyamide materials with uniform CNT distribution in the polymer matrix.</P> <P>Graphic Abstract</P><P>Singlewall and multiwall carbon nanotubes were covalently functionalised with ethylenediamine (EDA) in a simple one-pot process providing a good surface coverage. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm33348a'> </P>
Olofsson, Niklas,Ek-Weis, Johan,Eriksson, Anders,Idda, Tonio,Campbell, Eleanor E B IOP Pub 2009 Nanotechnology Vol.20 No.38
<P>The electromechanical properties of arrays of vertically aligned multiwalled carbon nanotubes were studied in a parallel plate capacitor geometry. The electrostatic actuation was visualized using both optical microscopy and scanning electron microscopy, and highly reproducible behaviour was achieved for actuation voltages below the pull-in voltage. The walls of vertically aligned carbon nanotubes behave as solid cohesive units. The effective Young’s modulus for the carbon nanotube arrays was determined by comparing the actuation results with the results of electrostatic simulations and was found to be exceptionally low, of the order of 1–10 MPa. The capacitance change and <I>Q</I>-factor were determined by measuring the frequency dependence of the radio-frequency transmission. Capacitance changes of over 20% and <I>Q</I>-factors in the range 100–10 were achieved for a frequency range of 0.2–1.5 GHz. </P>
Lee, Dong Su,Svensson, Johannes,Lee, Sang Wook,Park, Yung Woo,Campbell, Eleanor E B American Scientific Publishers 2006 Journal of Nanoscience and Nanotechnology Vol.6 No.5
<P>We have developed a method to fabricate crossed junctions between semiconducting (s) and metallic (m) carbon nanotubes (CNTs) combining electric field directed chemical vapor deposition growth and dielectrophoretic alignment. By separating the s- and m-CNTs with a thin dielectric an ultra-small field effect transistor (FET) was fabricated. By using the m-CNT as a gate it was possible to modulate the source-drain current through the s-CNT FET channel. We have also used the m-CNT as an electrical lead. An off-state current lowering was observed when the m-CNT lead was used as a drain electrode.</P>
Kim, Hakseong,Shin, Dong Hoon,McAllister, Kirstie,Seo, Miri,Lee, Sangik,Kang, Il-Suk,Park, Bae Ho,Campbell, Eleanor E. B.,Lee, Sang Wook American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.8
<P>Accurate and precise determination of mechanical properties of nanoscale materials is mandatory since device performances of nanoelectromechanical systems (NEMS) are closely related to the flexural properties of the materials. In this study, the intrinsic mechanical properties of highly stressed silicon nitride (SiN) beams of varying lengths are investigated using two different techniques: Dynamic flexural measurement using optical interferometry and quasi-static flexural measurement using atomic force microscopy. The resonance frequencies of the doubly clamped, highly stressed beams are found to be inversely proportional to their length, which is not usually observed from a beam but is expected from a string-like structure. The mass density of the SiN beams can be precisely determined from the dynamic flexural measurements by using the values for internal stress and Young's modulus determined from the quasi-static measurements. As a result, the mass resolution of the SiN beam resonators was predicted to be a few attograms, which was found to be in excellent agreement with the experimental results. This work suggests that accurate and precise determination of mechanical properties can be achieved through combined flexural measurement techniques, which is a crucial key for designing practical NEMS applications such as biomolecular sensors and gas detectors.</P>
Svensson, Johannes,Sourab, Abdelrahim A,Tarakanov, Yury,Lee, Dong Su,Park, Seung Joo,Baek, Seung Jae,Park, Yung Woo,Campbell, Eleanor E B IOP Pub 2009 Nanotechnology Vol.20 No.17
<P>Direct measurements are presented of the Schottky barrier (SB) heights of carbon nanotube devices contacted with Pd electrodes. The SB barrier heights were determined from the activation energy of the temperature-dependent thermionic emission current in the off-state of the devices. The barrier heights generally decrease with increasing diameter of the nanotubes and they are in agreement with the values expected when assuming little or no influence of Fermi level pinning. </P>
Adsorption Materials and Processes for Carbon Capture from Gas-Fired Power Plants: AMPGas
Gibson, J. A. Arran,Mangano, Enzo,Shiko, Elenica,Greenaway, Alex G.,Gromov, Andrei V.,Lozinska, Magdalena M.,Friedrich, Daniel,Campbell, Eleanor E. B.,Wright, Paul A.,Brandani, Stefano American Chemical Society 2016 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.55 No.13
<P>The key challenge in postcombustion capture from gas-fired power plants is related to the low CO2 concentration in the flue gas (4-8% by volume). This means that conventional amine processes will result in a relatively high energy penalty, whereas novel adsorbents and adsorption processes have the potential to improve the efficiency of separation. High-selectivity adsorbents are required to achieve relatively high CO2 uptake at low partial pressures, which means that the separation process should be based on either very strong physisorption or chemisorption with thermal regeneration. From the process point of view, the main challenge is to develop efficient separation processes with rapid thermal cycles. In this report we present a detailed overview of the methodology behind the development of novel materials and processes as part of the 'Adsorption Materials and Processes for Gas-fired power plants' (AMPGas) project. Examples from a wide variety of materials tested are presented, and the design of an innovative bench-scale 12-column rotary wheel adsorber system is discussed. The strategy to design, characterize, and test novel materials (zeolites, amine-containing MOFs, amine-based silicas, amine-based activated carbons, and carbon nanotubes), specifically designed for CO2 capture from dilute streams is presented.</P>