Searched for: faculty:"Applied%5C%2BSciences"
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Barkelid, K.M. (author)
doctoral thesis 2014
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Meerwaldt, H.B. (author), Johnston, S.R. (author), Van der Zant, H.S.J. (author), Steele, G.A. (author)
We report fast readout of the motion of a carbon nanotube mechanical resonator. A close-proximity high electron mobility transistor amplifier is used to increase the bandwidth of the measurement of nanotube displacements from the kHz to the MHz regime. Using an electrical detection scheme with the nanotube acting as a mixer, we detect the...
journal article 2013
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Meerwaldt, H.B. (author)
A carbon nanotube (CNT) is a remarkable material and can be thought of as a single-atom thick cylinder of carbon atoms capped of with a semisphere. This is called a single-walled CNT and, depending on how the cylinder is rolled up, CNTs are either semiconducting or metallic. A CNT is made into a mechanical resonator by suspending it between two...
doctoral thesis 2013
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Keijzers, C.J.H. (author)
doctoral thesis 2012
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Hortensius, H.L. (author), Öztürk, A. (author), Zeng, P. (author), Driessen, E.F.C. (author), Klapwijk, T.M. (author)
Antenna-coupled suspended single carbon nanotubes exposed to 108?GHz microwave radiation are shown to be selectively heated with respect to their metal contacts. This leads to an increase in the conductance as well as to the development of a power-dependent DC voltage. The increased conductance stems from the temperature dependence of tunneling...
journal article 2012
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Buchs, G. (author), Barkelid, K.M. (author), Bagiante, S. (author), Steele, G.A. (author), Zwiller, V. (author)
We use scanning photocurrent microscopy (SPCM) to investigate individual suspended semiconducting carbon nanotube devices where the potential profile is engineered by means of local gates. In situ tunable p-n junctions can be generated at any position along the nanotube axis. Combining SPCM with transport measurements allows a detailed...
journal article 2011
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Götz, G.T.J. (author)
We experimentally investigate Quantum Dots, formed in Carbon Nanotubes. The first part of this thesis deals with charge sensing on such quantum dots. The charge sensor is a metallic Single-electron-transistor, sensitive to the charge of a single electron on the quantum dot. We use this technique for real-time charge readout and precise tuning of...
doctoral thesis 2010
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Zonnevylle, A.C. (author), Hagen, C.W. (author), Kruit, P. (author), Valenti, M. (author), Schmidt-Ott, A. (author)
Positioning of charged nanoparticles with the help of charge patterns in an insulator substrate is a known method. However, the creation of charge patterns with a scanning electron microscope for this is relatively new. Here a scanning electron microscope is used for the creation of localized charge patterns in an insulator, while a glowing wire...
journal article 2009
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Ishii, M. (author), Hamilton, B. (author), Poolton, N. (author)
We have observed the distribution of electron trapping centers on distorted carbon nanotubes (CNTs) by a unique x-ray analysis technique that has both elemental and spatial selectivities. This technique involves the use of scanning probe microscopy (SPM) under synchrotron radiation excitation of the inner shell of carbon. The probe detects the...
journal article 2008
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Witkamp, B. (author), Poot, M. (author), Pathangi, H. (author), Hüttel, A.K. (author), Van der Zant, H.S.J. (author)
We have fabricated suspended metal paddle resonators with carbon nanotubes functioning as self-detecting torsional springs. We observe gate-tunable resonances that either tune to higher or to lower frequencies when increasing the dc voltage on the back gate. We attribute the former modes to flexural vibrations of the paddle resonator, while the...
journal article 2008
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Tatur, J. (author)
This research focuses on the iron storage protein ferritin. Ferritin is a protein involved in iron homeostasis by storing Fe(II) excess in the form of an Fe(III) mineral core in the presence of oxygen and by releasing iron during iron deficiency. Ferritins are vital for human health. Their malfunction may lead among other diseases to anemia,...
doctoral thesis 2007
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Minot, E.D. (author), Janssens, A.M. (author), Heller, I. (author), Heering, H.A. (author), Dekker, C. (author), Lemay, S.G. (author)
Carbon nanotube transistors show tremendous potential for electronic detection of biomolecules in solution. However, the nature and magnitude of the sensing signal upon molecular adsorption have so far remained controversial. Here, the authors show that the choice of the reference electrode is critical and resolves much of the previous...
journal article 2007
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Kruit, P. (author), Bezuijen, M. (author), Barth, J.E. (author)
The potential application of carbon nanotubes as electron sources in electron microscopes is analyzed. The resolution and probe current that can be obtained from a carbon nanotube emitter in a low-voltage scanning electron microscope are calculated and compared to the state of the art using Schottky electron sources. Many analytical equations...
journal article 2006
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Jarillo-Herrero, P.D. (author)
Electronic transport through nanostructures can be very different from trans- port in macroscopic conductors, especially at low temperatures. Carbon na- notubes are tiny cylinders made of carbon atoms. Their remarkable electronic and mechanical properties, together with their small size (a few nm in diameter), make them very attractive for...
doctoral thesis 2005
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Kong, J. (author), LeRoy, B.J. (author), Lemay, S.G. (author), Dekker, C. (author)
We have developed a fabrication process for incorporating a gate electrode into suspended single-walled carbon nanotube structures for scanning tunneling spectroscopy studies. The nanotubes are synthesized by chemical vapor deposition directly on a metal surface. The high temperature (800?°C) involved in the growth process poses challenging...
journal article 2005
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LeRoy, B.J. (author), Lemay, S.G. (author), Kong, J. (author), Dekker, C. (author)
We have performed low-temperature scanning tunneling microscopy measurements on single-wall carbon nanotubes that are freely suspended over a trench. The nanotubes were grown by chemical vapor deposition on a Pt substrate with predefined trenches etched into it. Atomic resolution was obtained on the freestanding portions of the nanotubes....
journal article 2004
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Maltezopoulos, T. (author), Kubetzka, A. (author), Morgenstern, M. (author), Wiesendanger, R. (author), Lemay, S.G. (author), Dekker, C. (author)
We investigated the local density of states (LDOS) of extended individual metallic single-walled carbon nanotubes using low-temperature scanning tunneling spectroscopy. We observed that the LDOS oscillates with energy close to the Fermi level. The oscillation period of about 50 meV varies with position on the nanotube. Maps of the LDOS reveal...
journal article 2003
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Janssen, J.W. (author)
Carbon nanotubes are small cylindrical molecules with a typical diameter of 1 nm and lengths of up to micrometers. These intriguing molecules exhibit, depending on the exact atomic structure, either semiconducting or metallic behavior. This makes them ideal candidates for possible future molecular electronics. In this thesis Janssen describes...
doctoral thesis 2001
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Postma, H.W.Ch. (author)
In this thesis Postma presents transport experiments performed on individual single-wall carbon nanotubes. Carbon nanotubes are molecules entirely made of carbon atoms. The electronic properties are determined by the exact symmetry of the nanotube lattice, resulting in either metallic or semiconducting behaviour. Due to their small diameter,...
doctoral thesis 2001
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