Tags: experiments

Online Presentations (61-78 of 78)

  1. SPMW Nanotube, nanoneedle and nanomeniscus: mechanical and wetting properties of modified AFM tip apex

    12 Dec 2006 | | Contributor(s)::

    Among AFM microscopes, Dynamic force microscopes (DFM) are very sensitive to variation of minute forces involved in the interaction between the tip and the surface. However, despite numerous efforts, imaging and probing mechanical properties of soft materials in air and water at the nm scale are...

  2. SPMW Nanomechanics: from nanotechnology to biology

    12 Dec 2006 | | Contributor(s)::

    The development of new materials with size of few nanometers has opened a new field of scientific and technological research. The goal is to develop faster and better communication systems and transports, as well as smarter and smaller nanodevices for biomedical applications. To reach these...

  3. SPMW Nonlinear dynamics in AFM - chaos and parametric resonance

    05 Jan 2007 | | Contributor(s):: Arvind Raman

    The field of nonlinear dynamics deals with mathematical techniques to study the nonlinear equations that serve as models of physical systems. The benefits of using nonlinear dynamics concepts to interpret and predict probe oscillations in dynamic AFM [1] are becoming increasingly clear....

  4. SPMW Mechanisms of atomic friction studied by friction force microscopy

    12 Dec 2006 | | Contributor(s):: Meyer

    Force microscopy is a versatile instrument to investigate physical phenomena on surfaces. The first emphasis is on the study of friction on the nanometer-scale, also called nanotribology. It will be shown that atomic-scale stick-slip is relatively well understood, where the dependence on...

  5. Materials Science on the Atomic Scale with the 3-D Atom Probe

    08 Nov 2006 | | Contributor(s)::

    Some of the key goals of materials science and technology are to be able to design a material from first principles, to predict its behaviour, and also to optimise the processing route for its manufacture. In recent years, these goals have come closer to realisation, thanks in part to the...

  6. A Primer on Scanning Tunneling Microscopy (STM)

    04 Apr 2006 | | Contributor(s):: Ron Reifenberger

    Scanning Probe Microscopes and their remarkable ability to provide three-dimensional maps of surfaces at the nanometer length scale have arguably been the most important tool in establishing the world-wide emergence of Nanotechnology. In this talk, the fundamental ideas behind the first scanning...

  7. Electron and Ion Microscopies as Characterization Tools for Nanoscience and Nanotechnology

    27 Feb 2006 | | Contributor(s):: Eric Stach

    This tutorial presents a broad overview of the basic physical principles of techniques used in scanning electron microscopy (SEM), as well as their application to understanding processing/structure/property relationships in nanostructured materials. Special emphasis is placed on the capabilities...

  8. Metal Oxide Nanowires: Synthesis, Characterization and Device Applications

    07 Mar 2006 | | Contributor(s):: Jia Grace Lu

    Various metal oxide nanowires, such as ZnO, SnO2, Fe2O3, In2O3 and Ga2O3, have been synthesized by chemical vapor deposition method. Their structures and properties are characterized by TEM, SEM, XRD, AFM, photoluminescence, photoconductance, scanning surface potential microscopy, and electrical...

  9. Making the Tiniest and Fastest Transistor using Atomic Layer Deposition (ALD)

    13 Feb 2006 | | Contributor(s):: peide ye

    Atomic layer deposition (ALD) is an emerging nanotechnology enables the deposit of ultrathin films, one atomic layer by one atomic layer. ALD provides a powerful, new capability to grow or regrow nanoscale ultrathin films of metals, semiconductors and insulators. This presentation introduces ALD...

  10. Designing Nanocomposite Materials for Solid-State Energy Conversion

    10 Nov 2005 | | Contributor(s)::

    New materials will be necessary to break through today's performance envelopes for solid-state energy conversion devices ranging from LED-based solid-state white lamps to thermoelectric devices for solid-state refrigeration and electric power generation. The combination of recent materials...

  11. Designing Nanocomposite Thermoelectric Materials

    08 Nov 2005 | | Contributor(s):: Timothy D. Sands

    This tutorial reviews recent strategies for designing high-ZT nanostructured materials, including superlattices, embedded quantum dots, and nanowire composites. The tutorial highlights the challenges inherent to coupled electronic and thermal transport properties.

  12. Laser Cooling of Solids

    06 Oct 2005 | | Contributor(s)::

    Enhanced laser cooling of ion doped nanocrystalline powders (e.g., Yb3+: Y2O3) can be achieved by enhancing the anti-Stokes, off-resonance absorption, which is proportional to the three design-controlled factors, namely, dopant concentration, pumping field energy, and anti-Stokes transition...

  13. Semiconductor Interfaces at the Nanoscale

    17 Oct 2005 | | Contributor(s):: David Janes

    The trend in downscaling of electronic devices and the need to add functionalities such as sensing and nonvolatile memory to existing circuitry dictate that new approaches be developed for device structures and fabrication technologies. Various device technologies are being investigated,...

  14. Towards Molecular Electronic Circuitry: Selective Deposition of Metals on Patterned ...

    28 Jul 2005 | | Contributor(s)::

    We have developed a robust method by which to construct complex two- and three- dimensional structures based on controlling interfacial chemistry. This work has important applications in molecular/organic electronics, sensing, and other technologies. Our method is extensible to many different...

  15. Synthetic and Processing Strategies to New Molecular and Polymeric...

    28 Jul 2005 | | Contributor(s):: ,

    Recent achievements in the design and synthesis of new arene/heteroaromatic oligomers/molecules functionalized with a variety of phenacyl, alkylcarbonyl, and perfluoroalkylcarbonyl will be presented. These organic semiconductors exhibit low-lying LUMOs allowing efficient electron...

  16. Probing Silicon-Based Molecular Electronics with Scanning Tunneling Microscopy

    29 Jul 2005 | | Contributor(s)::

    In recent years, substantial progress has occurred in the field of molecular electronics [1]. In this paper, charge transport through molecule-semiconductor junctions is probed with ultra-high vacuum (UHV) scanning tunneling microscopy (STM). The presence of the semiconductor band gap enables...

  17. Measurement of Single Molecule Conductance using STM-Based Break Junctions

    28 Jul 2005 | | Contributor(s)::

    We have measured single molecule conductance using a combined STM- and conducting AFM-based break junction method. The method works in aqueous solutions, which is suitable for biologically relevant molecules such as DNA and peptides, and also allows us to control electron transport through redox...

  18. Probing Molecular Conduction with Scanning Probe Microscopy

    08 Jul 2004 | | Contributor(s)::

    This tutorial will provide an overview of scanning probe microscopy (SPM) andits application towards problems in molecular conduction. In an effort to communicatethe power and limitations of these instruments, the tutorial will describe designconsiderations and reveal the detailed construction...