The Experts below are selected from a list of 57156 Experts worldwide ranked by ideXlab platform

Gabino Rubiobollinger - One of the best experts on this subject based on the ideXlab platform.

  • carbon fibre tips for scanning probe microscopy based on quartz tuning fork Force sensors
    Nanotechnology, 2010
    Co-Authors: Andres Castellanosgomez, Nicolas Agrait, Gabino Rubiobollinger
    Abstract:

    We report the fabrication and the characterization of carbon fibre tips for use in combined scanning tunnelling and Force microscopy based on piezoelectric quartz tuning fork Force sensors. We find that the use of carbon fibre tips results in a minimum impact on the dynamics of quartz tuning fork Force sensors, yielding a high quality factor and, consequently, a high Force gradient Sensitivity. This high Force Sensitivity, in combination with high electrical conductivity and oxidation resistance of carbon fibre tips, make them very convenient for combined and simultaneous scanning tunnelling microscopy and atomic Force microscopy measurements. Interestingly, these tips are quite robust against occasionally occurring tip crashes. An electrochemical fabrication procedure to etch the tips is presented that produces a sub-100-nm apex radius in a reproducible way which can yield high resolution images.

  • carbon fibre tips for scanning probe microscopy based on quartz tuning fork Force sensors
    arXiv: Mesoscale and Nanoscale Physics, 2010
    Co-Authors: Andres Castellanosgomez, Nicolas Agrait, Gabino Rubiobollinger
    Abstract:

    We report the fabrication and the characterization of carbon fibre tips for their use in combined scanning tunnelling and Force microscopy based on piezoelectric quartz tuning fork Force sensors. We find that the use of carbon fibre tips results in a minimum impact on the dynamics of quartz tuning fork Force sensors yielding a high quality factor and consequently a high Force gradient Sensitivity. This high Force Sensitivity in combination with high electrical conductivity and oxidation resistance of carbon fibre tips make them very convenient for combined and simultaneous scanning tunnelling microscopy and atomic Force microscopy measurements. Interestingly, these tips are quite robust against occasionally occurring tip crashes. An electrochemical fabrication procedure to etch the tips is presented that produces a sub-100 nm apex radius in a reproducible way which can yield high resolution images.

Nicolas Agrait - One of the best experts on this subject based on the ideXlab platform.

  • carbon fibre tips for scanning probe microscopy based on quartz tuning fork Force sensors
    Nanotechnology, 2010
    Co-Authors: Andres Castellanosgomez, Nicolas Agrait, Gabino Rubiobollinger
    Abstract:

    We report the fabrication and the characterization of carbon fibre tips for use in combined scanning tunnelling and Force microscopy based on piezoelectric quartz tuning fork Force sensors. We find that the use of carbon fibre tips results in a minimum impact on the dynamics of quartz tuning fork Force sensors, yielding a high quality factor and, consequently, a high Force gradient Sensitivity. This high Force Sensitivity, in combination with high electrical conductivity and oxidation resistance of carbon fibre tips, make them very convenient for combined and simultaneous scanning tunnelling microscopy and atomic Force microscopy measurements. Interestingly, these tips are quite robust against occasionally occurring tip crashes. An electrochemical fabrication procedure to etch the tips is presented that produces a sub-100-nm apex radius in a reproducible way which can yield high resolution images.

  • carbon fibre tips for scanning probe microscopy based on quartz tuning fork Force sensors
    arXiv: Mesoscale and Nanoscale Physics, 2010
    Co-Authors: Andres Castellanosgomez, Nicolas Agrait, Gabino Rubiobollinger
    Abstract:

    We report the fabrication and the characterization of carbon fibre tips for their use in combined scanning tunnelling and Force microscopy based on piezoelectric quartz tuning fork Force sensors. We find that the use of carbon fibre tips results in a minimum impact on the dynamics of quartz tuning fork Force sensors yielding a high quality factor and consequently a high Force gradient Sensitivity. This high Force Sensitivity in combination with high electrical conductivity and oxidation resistance of carbon fibre tips make them very convenient for combined and simultaneous scanning tunnelling microscopy and atomic Force microscopy measurements. Interestingly, these tips are quite robust against occasionally occurring tip crashes. An electrochemical fabrication procedure to etch the tips is presented that produces a sub-100 nm apex radius in a reproducible way which can yield high resolution images.

Andres Castellanosgomez - One of the best experts on this subject based on the ideXlab platform.

  • carbon fibre tips for scanning probe microscopy based on quartz tuning fork Force sensors
    Nanotechnology, 2010
    Co-Authors: Andres Castellanosgomez, Nicolas Agrait, Gabino Rubiobollinger
    Abstract:

    We report the fabrication and the characterization of carbon fibre tips for use in combined scanning tunnelling and Force microscopy based on piezoelectric quartz tuning fork Force sensors. We find that the use of carbon fibre tips results in a minimum impact on the dynamics of quartz tuning fork Force sensors, yielding a high quality factor and, consequently, a high Force gradient Sensitivity. This high Force Sensitivity, in combination with high electrical conductivity and oxidation resistance of carbon fibre tips, make them very convenient for combined and simultaneous scanning tunnelling microscopy and atomic Force microscopy measurements. Interestingly, these tips are quite robust against occasionally occurring tip crashes. An electrochemical fabrication procedure to etch the tips is presented that produces a sub-100-nm apex radius in a reproducible way which can yield high resolution images.

  • carbon fibre tips for scanning probe microscopy based on quartz tuning fork Force sensors
    arXiv: Mesoscale and Nanoscale Physics, 2010
    Co-Authors: Andres Castellanosgomez, Nicolas Agrait, Gabino Rubiobollinger
    Abstract:

    We report the fabrication and the characterization of carbon fibre tips for their use in combined scanning tunnelling and Force microscopy based on piezoelectric quartz tuning fork Force sensors. We find that the use of carbon fibre tips results in a minimum impact on the dynamics of quartz tuning fork Force sensors yielding a high quality factor and consequently a high Force gradient Sensitivity. This high Force Sensitivity in combination with high electrical conductivity and oxidation resistance of carbon fibre tips make them very convenient for combined and simultaneous scanning tunnelling microscopy and atomic Force microscopy measurements. Interestingly, these tips are quite robust against occasionally occurring tip crashes. An electrochemical fabrication procedure to etch the tips is presented that produces a sub-100 nm apex radius in a reproducible way which can yield high resolution images.

Ricardo Garcia - One of the best experts on this subject based on the ideXlab platform.

  • theory of multifrequency atomic Force microscopy
    Physical Review Letters, 2008
    Co-Authors: Jose R Lozano, Ricardo Garcia
    Abstract:

    We develop a theory that explains the origin of the high Force Sensitivity observed in multifrequency Force microscopy experiments. The ability of the microscope to extract complementary information on the surface properties is increased by the simultaneous excitation of several flexural cantilever modes. The Force Sensitivity in multifrequency operation is about 0.2 pN. The analytical model identifies the virial and the energy dissipated by the tip-surface Forces as the parameters responsible for the material contrast. The agreement obtained among the theory, experiments and numerical simulations validates the model.

  • Force microscopy imaging of individual protein molecules with sub pico newton Force Sensitivity
    Journal of Molecular Recognition, 2007
    Co-Authors: Shivprasad Patil, Nicolas F Martinez, Jose R Lozano, Ricardo Garcia
    Abstract:

    The capability of atomic Force microscopes (AFM) to generate atomic or nanoscale resolution images of surfaces has deeply transformed the study of materials. However, high resolution imaging of biological systems has proved more difficult than obtaining atomic resolution images of crystalline surfaces. In many cases, the Forces exerted by the tip on the molecules (1-10 nN) either displace them laterally or break the noncovalent bonds that hold the biomolecules together. Here, we apply a Force microscope concept based on the simultaneous excitation of the first two flexural modes of the cantilever. The coupling of the modes generated by the tip-molecule Forces enables imaging under the application of Forces ( approximately 35 pN) which are smaller than those needed to break noncovalent bonds. With this instrument we have resolved the intramolecular structure of antibodies in monomer and pentameric forms. Furthermore, the instrument has a Force Sensitivity of 0.2 pN which enables the identification of compositional changes along the protein fragments.

James Ranshaw - One of the best experts on this subject based on the ideXlab platform.

  • Femto-Newton Force Sensitivity quartz tuning fork sensor
    Sensors and Actuators A-physical, 2007
    Co-Authors: Mladen Barbic, Lowell Eliason, James Ranshaw
    Abstract:

    We describe a quartz tuning fork resonator that is smaller in size than previously reported sensors of the same shape. Smaller dimensions result in the reduced spring constant of the tuning fork resonator with important potential performance improvements in scanning probe microscopes and Force sensing instruments. The spring constant of 480 N/m and mechanical quality factor Q of 27,500 are nearly optimal values needed for frequency modulated atomic Force microscopy. The tuning fork resonator Force noise floor of 6.5 fN/√Hz provides better Force Sensitivity than previously reported larger size quartz tuning forks.