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Accommodation of Plastic Deformation by Ultrasound-Induced Grain Rotation

Dutta, R.K. (author), Petrov, R.H. (author), Hermans, M.J.M. (author), Richardson, I.M. (author)

Electron backscatter diffraction was used to investigate the softening effect in low-carbon steel [Fe-0.051C-0.002Si-0.224Mn-0.045Al (wt pct)] during tensile deformation with in situ ultrasonic treatment. A bimodal grain size distribution is observed with relatively small equiaxed grains with an average diameter of 10 ?m at the grain boundaries...

journal article 2015

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Methods for assessing basic particle properties and cytotoxicity of engineered nanoparticles

Kalantzi, O.I. (author), Biskos, G. (author)

The increasing penetration of materials and products containing engineered nanoparticles (ENPs) to the market is posing many concerns regarding their environmental impacts. To assess these impacts, there is an urgent need of techniques for determining the health-related properties of ENPs and standards for assessing their toxicity. Although a...

journal article 2014

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Imaging of charge trapping in distorted carbon nanotubes by x-ray excited scanning probe microscopy

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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Self-detecting gate-tunable nanotube paddle resonators

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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Fabrication and low-temperature transport properties of selectively grown dual-gated single-electron transistors

Motohisa, J. (author), Nakajima, F. (author), Fukui, T. (author), Van der Wiel, W.G. (author), Elzerman, J.M. (author), De Franceschi, S. (author), Kouwenhoven, L.P. (author)

We report on the fabrication of a dual-gated single-electron transistor (SET) based on a quantum dot (QD) formed by selective area growth of metalorganic vapor-phase epitaxy, and its low-temperature transport properties. We observe clear Coulomb oscillations in a SET fabricated in combination with direct growth of nanostructures and...

journal article 2002

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Photoluminescence enhancement in thin films of PbSe nanocrystals

Christova, C.G. (author), Stouwdam, J.W. (author), Eijkemans, T.J. (author), Silov, A.Y. (author), Van der Heijden, R.W. (author), Kemerink, M. (author), Janssen, R.A.J. (author), Salemink, H.W.M. (author)

Remarkable photoluminescence enhancement (PLE) in submonolayer films of PbSe nanocrystals (NCs) upon continuous illumination was observed. The intensity increase from films on InP substrates was highest in vacuum, while for films on Si/SiO2 substrates the PLE was stronger in air. The magnitude of the PLE was found to depend on the excitation...

journal article 2008

document

Magnetovibrational coupling in small cantilevers

Kovalev, A.A. (author), Bauer, G.E.W. (author), Brataas, A. (author)

A nanomagnetomechanical system consisting of a cantilever and a thin magnetic film is predicted to display magnetovibrational modes, which should enable applications for sensors and actuators. The “polaritonic” modes can be detected by line splittings in ferromagnetic resonance spectra.

journal article 2003

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Josephson squelch filter for quantum nanocircuits

Forn-Díaz, P. (author), Schouten, R.N. (author), Den Braver, W.A. (author), Mooij, J.E. (author), Harmans, C.J.P.M. (author)

We fabricated and tested a squelch circuit consisting of a copper powder filter with an embedded Josephson junction connected to ground. For small signals (squelch ON), the small junction inductance attenuates strongly from dc to at least 1 GHz, while for higher frequencies dissipation in the copper powder increases the attenuation exponentially...

journal article 2009

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Let’s Get Small: An Introduction to Transitional Issues in Nanotech and Intellectual Property

Koepsell, D.R. (author)

Much of the discussion regarding nanotechnology centers around perceived and prosphesied harms and risks. While there are real risks that could emerge from futuristic nanotechnology, there are other current risks involved with its development, not involving physical harms, that could prevent its full promise from being realized. Transitional...

journal article 2009

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Scaling of nano-Schottky-diodes

Smit, G.D.J. (author), Rogge, S. (author), Klapwijk, T.M. (author)

A generally applicable model is presented to describe the potential barrier shape in ultrasmall Schottky diodes. It is shown that for diodes smaller than a characteristic length lc (associated with the semiconductor doping level) the conventional description no longer holds. For such small diodes the Schottky barrier thickness decreases with...

journal article 2002

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Deposition and atomic force microscopy of individual phthalocyanine polymers between nanofabricated electrodes

Tans, S.J. (author), Geerligs, L.J. (author), Dekker, C. (author), Wu, J. (author), Wegner, G. (author)

journal article 1997

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Nanofabrication of electrodes with sub-5 nm spacing for transport experiments on single molecules and metal clusters

Bezryadin, A. (author), Dekker, C. (author)

journal article 1997

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Magnetic properties of electroplated nano/microgranular NiFe thin films for rf application

Zhuang, Y. (author), Vroubel, M. (author), Rejaei, B. (author), Burghartz, J.N. (author), Attenborough, K. (author)

A granular NiFe thin film with large in-plane magnetic anisotropy and high ferromagnetic-resonance frequency developed for radio-frequency integrated circuit (IC) applications is presented. During the deposition, three-dimensional (3D) growth occurs, yielding NiFe grains (? ? 1.0??m). Nanonuclei (? ? 30–50?nm) are observed in single NiFe grains...

journal article 2005

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Highly efficient carrier multiplication in PbS nanosheets

Aerts, M. (author), Bielewicz, T. (author), Klinke, C. (author), Grozema, F.C. (author), Houtepen, A.J. (author), Schins, J.M. (author), Siebbeles, L.D.A. (author)

Semiconductor nanocrystals are promising for use in cheap and highly efficient solar cells. A high efficiency can be achieved by carrier multiplication (CM), which yields multiple electron-hole pairs for a single absorbed photon. Lead chalcogenide nanocrystals are of specific interest, since their band gap can be tuned to be optimal to exploit...

journal article 2014

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High charge mobility in two-dimensional percolative networks of PbSe quantum dots connected by atomic bonds

Evers, W.H. (author), Schins, J.M. (author), Aerts, M. (author), Kulkarni, A. (author), Capiod, P. (author), Berthe, M. (author), Grandidier, B. (author), Delerue, C. (author), van der Zant, H.S.J. (author), van Overbeek, C. (author), Peterse, J.L. (author), Vanmaekelbergh, D. (author), Siebbeles, L.D.A. (author)

Two-dimensional networks of quantum dots connected by atomic bonds have an electronic structure that is distinct from that of arrays of quantum dots coupled by ligand molecules. We prepared atomically coherent two-dimensional percolative networks of PbSe quantum dots connected via atomic bonds. Here, we show that photoexcitation leads to...

journal article 2015

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High charge-carrier mobility enables exploitation of carrier multiplication in quantum-dot films

Suchand Sandeep, C.S. (author), Ten Cate, S. (author), Schins, J.M. (author), Savenije, T.J. (author), Liu, Y. (author), Law, M. (author), Kinge, S. (author), Houtepen, A.J. (author), Siebbeles, L.D.A. (author)

Carrier multiplication, the generation of multiple electron–hole pairs by a single photon, is of great interest for solar cells as it may enhance their photocurrent. This process has been shown to occur efficiently in colloidal quantum dots, however, harvesting of the generated multiple charges has proved difficult. Here we show that by tuning...

journal article 2013

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Proximity effect in ion-beam-induced deposition of nanopillars

Chen, P. (author), Salemink, H.W.M. (author), Alkemade, P.F.A. (author)

Ion-beam-induced deposition (IBID) is a powerful technique for prototyping three-dimensional nanostructures. To study its capability for this purpose, the authors investigate the proximity effect in IBID of nanopillars. In particular, the changes in shape and dimension of pillars are studied when a second pillar is grown near an existing pillar....

journal article 2009

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Nanoparticles made-to-measure: Aerosols prove to be indispensable for nanotechnology

Schrauwers, A. (author)

Is it possible to make platinum particles with a diameter of less than eight nanometres? That was the question Jan Marijnissen at the aerosol lab of Delft ChemTech was asked. Together with graduate student Jan van Erven, the famous aerosol expert Sheldon Friedlander of the University of California (UCLA), and the University of Karlsruhe, Germany...

journal article 2005

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Electron-beam-induced deformations of SiO2 nanostructures

Storm, A.J. (author), Chen, J.H. (author), Ling, X.S. (author), Zandbergen, H.W. (author), Dekker, C. (author)

The imaging beam of a transmission electron microscope can be used to fine tune critical dimensions in silicon oxide nanostructures. This technique is particularly useful for the fabrication of nanopores with single-nanometer precision, down to 2 nm. We report a detailed study on the effect of electron-beam irradiation on apertures with various...

journal article 2005

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A critical literature review of focused electron beam induced deposition

Van Dorp, W.F. (author), Hagen, C.W. (author)

An extensive review is given of the results from literature on electron beam induced deposition. Electron beam induced deposition is a complex process, where many and often mutually dependent factors are involved. The process has been studied by many over many years in many different experimental setups, so it is not surprising that there is a...

journal article 2008