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Search for "image contrast" in Full Text gives 44 result(s) in Beilstein Journal of Nanotechnology.

Nanoporous Ge thin film production combining Ge sputtering and dopant implantation

  • Jacques Perrin Toinin,
  • Alain Portavoce,
  • Khalid Hoummada,
  • Michaël Texier,
  • Maxime Bertoglio,
  • Sandrine Bernardini,
  • Marco Abbarchi and
  • Lee Chow

Beilstein J. Nanotechnol. 2015, 6, 336–342, doi:10.3762/bjnano.6.32

Graphical Abstract
  • annealing, leaving deep holes in the Ge film. The image contrast is affected by the variation of both local diffraction conditions and absorption. The moiré pattern visible in various areas of the deposited layer confirms its polycrystalline structure. The pores are difficult to observe in the cross
  • ) placed within the objective lens for capturing high-resolution images. In this mode, the image contrast is mainly affected by topographic variations allowing the presence of holes and asperities at the sample surface to be evidenced. The lateral size and the density were analyzed manually from the SEM
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Published 30 Jan 2015

Overview about the localization of nanoparticles in tissue and cellular context by different imaging techniques

  • Anja Ostrowski,
  • Daniel Nordmeyer,
  • Alexander Boreham,
  • Cornelia Holzhausen,
  • Lars Mundhenk,
  • Christina Graf,
  • Martina C. Meinke,
  • Annika Vogt,
  • Sabrina Hadam,
  • Jürgen Lademann,
  • Eckart Rühl,
  • Ulrike Alexiev and
  • Achim D. Gruber

Beilstein J. Nanotechnol. 2015, 6, 263–280, doi:10.3762/bjnano.6.25

Graphical Abstract
  • and subcellular constituents in detail [110]. Spectral imaging and unmixing offers substantial improvement in signal-to-noise ratio and image contrast compared to the use of monochrome band-pass emission filters as employed in conventional fluorescence microscopes [111]. This approach also facilitates
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Published 23 Jan 2015

Localized surface plasmon resonances in nanostructures to enhance nonlinear vibrational spectroscopies: towards an astonishing molecular sensitivity

  • Dan Lis and
  • Francesca Cecchet

Beilstein J. Nanotechnol. 2014, 5, 2275–2292, doi:10.3762/bjnano.5.237

Graphical Abstract
  • ] as well as unique orientational information about molecules at interfaces [36][37][38][39][40][41][42][43][44][45][46][47]. On the other hand, CARS has enabled rapid tissue imaging in biomedical applications. Proper image contrast can be obtained with CARS microscopy within one second and with a
  • , which often reduces image contrast in common immunofluorescence images. These properties promoted SE-CARS and CARS microscopy as a new tool for biomedical analysis. Still in 2011, Namboodiri et al. investigated the SERS and SE-CARS contribution from a mixture of pyridine molecules and silver colloids
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Published 28 Nov 2014

Cathode lens spectromicroscopy: methodology and applications

  • T. O. Menteş,
  • G. Zamborlini,
  • A. Sala and
  • A. Locatelli

Beilstein J. Nanotechnol. 2014, 5, 1873–1886, doi:10.3762/bjnano.5.198

Graphical Abstract
  • of interest in the image. Figure 3a illustrates XAS-PEEM imaging spectroscopy on a nanostructured Fe film on W(110). The off-resonant image contrast (leftmost panel) is due to the different secondary photoelectron yield from different surface structures, dominated by the variations in the work
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Published 27 Oct 2014

Electron-beam induced deposition and autocatalytic decomposition of Co(CO)3NO

  • Florian Vollnhals,
  • Martin Drost,
  • Fan Tu,
  • Esther Carrasco,
  • Andreas Späth,
  • Rainer H. Fink,
  • Hans-Peter Steinrück and
  • Hubertus Marbach

Beilstein J. Nanotechnol. 2014, 5, 1175–1185, doi:10.3762/bjnano.5.129

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  • transition yields the strongest element-specific absorption and thus maximizes the image contrast for ease of evaluation. The optical density of the structures was calculated by averaging the signal over the area of the respective structure (in the STXM micrograph) and referencing the signal to the
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Published 30 Jul 2014

Characterization of electroforming-free titanium dioxide memristors

  • John Paul Strachan,
  • J. Joshua Yang,
  • L. A. Montoro,
  • C. A. Ospina,
  • A. J. Ramirez,
  • A. L. D. Kilcoyne,
  • Gilberto Medeiros-Ribeiro and
  • R. Stanley Williams

Beilstein J. Nanotechnol. 2013, 4, 467–473, doi:10.3762/bjnano.4.55

Graphical Abstract
  • . Scanning transmission electron microscopy (STEM) was also used to explore the forming-free device from a structural and morphological standpoint. Figure 5 depicts STEM images obtained from bright-field (BF) detection. BF imaging was utilized rather than HAADF detection due to the latter having an image
  • contrast mainly dominated by the local atomic mass. In addition, the BF imaging has a major electron-phase contribution and channeling effect, which are more appropriate for probing the switching process. Nonetheless, no evidence of a switching effect was observed from a careful analysis along the junction
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Published 07 Aug 2013
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  • system and the actual imaging parameters used, both virial and dissipation channels reveal significant differences between AM and FM operation. While in AM mode the image contrast shows up in both channels almost equally, the FM data show highly diminished contrast in the dissipation channel but in
  • . However, in the 2nd phase and frequency-shift channels the borderlines of the single DNA strands are clearly visible. Furthermore, comparing the 1st and 2nd phase channels in AM-OL mode it becomes apparent that the observed image contrast in the 2nd eigenmode channel is about one order of magnitude higher
  • than in the 1st mode channel for the chosen parameters. On closer examination of the 2nd eigenmode channels in Figure 4 one notices some asymmetry in the image contrast around the DNA strands in all three operation modes. We checked whether this effect is influenced by the scanning direction but this
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Published 18 Mar 2013

Towards atomic resolution in sodium titanate nanotubes using near-edge X-ray-absorption fine-structure spectromicroscopy combined with multichannel multiple-scattering calculations

  • Carla Bittencourt,
  • Peter Krüger,
  • Maureen J. Lagos,
  • Xiaoxing Ke,
  • Gustaaf Van Tendeloo,
  • Chris Ewels,
  • Polona Umek and
  • Peter Guttmann

Beilstein J. Nanotechnol. 2012, 3, 789–797, doi:10.3762/bjnano.3.88

Graphical Abstract
  • hollow core of these nanostructures (inset shows the interlayer spacing). (c–d) HRTEM images showing typical image contrast pattern associated with the scroll-like morphology. Note the number of layers in opposing tube walls is different in each case. (a) X-ray images at different photon energies E from
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Published 23 Nov 2012

Dimer/tetramer motifs determine amphiphilic hydrazine fibril structures on graphite

  • Loji K. Thomas,
  • Nadine Diek,
  • Uwe Beginn and
  • Michael Reichling

Beilstein J. Nanotechnol. 2012, 3, 658–666, doi:10.3762/bjnano.3.75

Graphical Abstract
  • elliptical features that are about 1.4 nm long (arrows in Figure 4d). Assuming that electron-rich delocalized π clouds of the aromatic rings dominate the image contrast [37], the bright blobs are interpreted as hydrogen-bonded dimers, as shown in Figure 4b. Note that the distance between adjacent bright
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Published 19 Sep 2012

Ordered arrays of nanoporous gold nanoparticles

  • Dong Wang,
  • Ran Ji,
  • Arne Albrecht and
  • Peter Schaaf

Beilstein J. Nanotechnol. 2012, 3, 651–657, doi:10.3762/bjnano.3.74

Graphical Abstract
  • . The samples were investigated using an ultra-high-resolution scanning electron microscope (FE-SEM, Hitachi S-4800). Particle diameters were recalculated as circular diameters and measured by thresholding the image contrast in the SEM images and counting pixels. The average ligament size, which is
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Published 13 Sep 2012

Nano-structuring, surface and bulk modification with a focused helium ion beam

  • Daniel Fox,
  • Yanhui Chen,
  • Colm C. Faulkner and
  • Hongzhou Zhang

Beilstein J. Nanotechnol. 2012, 3, 579–585, doi:10.3762/bjnano.3.67

Graphical Abstract
  • region of sample 1 is available in Figure S1. A JEMS[34] software simulation of the HRTEM images is available in Figure S2. The simulated images illustrate the effect of crystal thickness on image contrast. Supporting Information File 68: High resolution TEM imaging and simulation. Acknowledgements The
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Published 08 Aug 2012

Mapping mechanical properties of organic thin films by force-modulation microscopy in aqueous media

  • Jianming Zhang,
  • Zehra Parlak,
  • Carleen M. Bowers,
  • Terrence Oas and
  • Stefan Zauscher

Beilstein J. Nanotechnol. 2012, 3, 464–474, doi:10.3762/bjnano.3.53

Graphical Abstract
  • properties of self-assembled monolayers and end-tethered protein thin films in aqueous media. Furthermore, we describe a simple analysis of the contact mechanics that enables the selection of FMM imaging parameters and thus yields a reliable interpretation of the FMM image contrast. Keywords: acoustic
  • substrates is further complicated by viscous damping effects [49], particularly when imaging in an aqueous environment. To better interpret image contrast in that case, one needs to understand the dependence of amplitude and phase on surface stiffness, and one needs a method to select the proper contact
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Published 26 Jun 2012

Repulsive bimodal atomic force microscopy on polymers

  • Alexander M. Gigler,
  • Christian Dietz,
  • Maximilian Baumann,
  • Nicolás F. Martinez,
  • Ricardo García and
  • Robert W. Stark

Beilstein J. Nanotechnol. 2012, 3, 456–463, doi:10.3762/bjnano.3.52

Graphical Abstract
  • sample distortions [1][2][3][4][5]. In recent years, various multifrequency approaches for image-contrast enhancement in air and liquid environments have been established [6][7][8][9][10][11]. For example, in bimodal force microscopy [6][7][8][12], two modulation signals resonantly drive the cantilever
  • that the image contrast is related to the signal-to-noise ratio and thus difficult to quantify for heterogeneous samples. The conclusions drawn here are on the basis of the optical impression of the authors. Comparing these observations with the bimodal-spectroscopy measurements on polystyrene from the
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Published 20 Jun 2012

qPlus magnetic force microscopy in frequency-modulation mode with millihertz resolution

  • Maximilian Schneiderbauer,
  • Daniel Wastl and
  • Franz J. Giessibl

Beilstein J. Nanotechnol. 2012, 3, 174–178, doi:10.3762/bjnano.3.18

Graphical Abstract
  • necessary in order to reduce the noise by reducing the bandwidth. In Figure 2b the flattened raw data of the frequency-shift channel gathered in lift-mode show an image contrast of ±5 mHz along the bit tracks. According to the resonance frequency f0 = 24097 Hz and spring constant k = 1250 Nm−1 of the sensor
  • to be set to relatively slow values, allowing for a small bandwidth, but leading to sizeable drift, as seen in both sets of Figure 3. The frequency-shift data set in the second (MFM) path was flattened by applying a simple parabolic fit and shows an image contrast of ±10 mHz (Figure 3b). Along the
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Published 29 Feb 2012

Effect of the tip state during qPlus noncontact atomic force microscopy of Si(100) at 5 K: Probing the probe

  • Adam Sweetman,
  • Sam Jarvis,
  • Rosanna Danza and
  • Philip Moriarty

Beilstein J. Nanotechnol. 2012, 3, 25–32, doi:10.3762/bjnano.3.3

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  • a valuable resource for theoreticians working on the development of realistic tip structures for NC-AFM simulations. Force spectroscopy measurements show that the tip termination critically affects both the short-range force and dissipated energy. Keywords: force spectroscopy; image contrast
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Published 09 Jan 2012

Template-assisted formation of microsized nanocrystalline CeO2 tubes and their catalytic performance in the carboxylation of methanol

  • Jörg J. Schneider,
  • Meike Naumann,
  • Christian Schäfer,
  • Armin Brandner,
  • Heiko J. Hofmann and
  • Peter Claus

Beilstein J. Nanotechnol. 2011, 2, 776–784, doi:10.3762/bjnano.2.86

Graphical Abstract
  • to the addition of the block copolymer P123® interconnects these ceria tubes, thus forming a network structure. Although we were not able to determine the thickness of the ceria film connecting the tubes, the image contrast in the TEM experiment (Figure 7, left side) is comparable to that of the
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Published 30 Nov 2011

Simulation of bonding effects in HRTEM images of light element materials

  • Simon Kurasch,
  • Jannik C. Meyer,
  • Daniela Künzel,
  • Axel Groß and
  • Ute Kaiser

Beilstein J. Nanotechnol. 2011, 2, 394–404, doi:10.3762/bjnano.2.45

Graphical Abstract
  • , we were able to measure the influence of charge redistribution on the HRTEM image contrast experimentally for two different materials, namely nitrogen doped graphene and single-layer hexagonal boron nitride [13]. This result has two important implications: First, chemical bonding gives small
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Published 19 Jul 2011

Formation of precise 2D Au particle arrays via thermally induced dewetting on pre-patterned substrates

  • Dong Wang,
  • Ran Ji and
  • Peter Schaaf

Beilstein J. Nanotechnol. 2011, 2, 318–326, doi:10.3762/bjnano.2.37

Graphical Abstract
  • microscopy (SEM, Hitachi S-4800). Particle sizes were calculated as circular diameters and determined using a threshold image contrast in the SEM images and performing a pixel count. SEM images at 45° tilt of (a) a square array of pyramidal pits (substrate A) and (b) an array of circular holes with square
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Published 22 Jun 2011

Single-pass Kelvin force microscopy and dC/dZ measurements in the intermittent contact: applications to polymer materials

  • Sergei Magonov and
  • John Alexander

Beilstein J. Nanotechnol. 2011, 2, 15–27, doi:10.3762/bjnano.2.2

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  • measurements are helpful in the identification of individual constituents of complex materials and will further enhance compositional imaging. The dC/dZ measurements, which were performed at a single frequency, gave rise to a number of intriguing questions regarding the origin of the image contrast. Expansion
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Published 06 Jan 2011
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