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Laser Imaging System Screens Nanotubes

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WEST LAFAYETTE, Ind., Nov. 22, 2010 — Researchers have demonstrated a new imaging tool for rapidly screening structures called single-wall carbon nanotubes, possibly hastening their use in creating a faster and more energy-efficient class of computers and electronics. The semiconducting nanostructures might be used to revolutionize electronics by replacing conventional silicon components and circuits. However, one obstacle in their application is that, unavoidably, metallic versions form during the manufacturing process, contaminating the semiconducting nanotubes. Now researchers have discovered that an advanced...Read full article

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    Published: November 2010
    Glossary
    atomic force microscope
    An atomic force microscope (AFM) is a high-resolution imaging and measurement instrument used in nanotechnology, materials science, and biology. It is a type of scanning probe microscope that operates by scanning a sharp tip (usually a few nanometers in diameter) over the surface of a sample at a very close distance. The tip interacts with the sample's surface forces, providing detailed information about the sample's topography and properties at the nanoscale. Key features and principles of...
    component
    1. A constituent part. It may consist of two or more parts cemented together, or with near and approximately matching surfaces. 2. The projection of a vector on a certain coordinate axis or along a particular direction. 3. In a lens system, one or more elements treated as a unit. 4. An optical element within a system.
    diode
    A two-electrode device with an anode and a cathode that passes current in only one direction. It may be designed as an electron tube or as a semiconductor device.
    electron
    A charged elementary particle of an atom; the term is most commonly used in reference to the negatively charged particle called a negatron. Its mass at rest is me = 9.109558 x 10-31 kg, its charge is 1.6021917 x 10-19 C, and its spin quantum number is 1/2. Its positive counterpart is called a positron, and possesses the same characteristics, except for the reversal of the charge.
    electronics
    That branch of science involved in the study and utilization of the motion, emissions and behaviors of currents of electrical energy flowing through gases, vacuums, semiconductors and conductors, not to be confused with electrics, which deals primarily with the conduction of large currents of electricity through metals.
    excited state
    The stationary state of an ion, atom or molecule, above the ground state that is produced by the interaction with the radiation field or another ion, atom or molecule. See ground state.
    ground state
    Also known as ground level. The lowest energy level of an atom or atomic system. A material in the ground state is not capable of emitting optical radiation. All other states are called excited states.
    label-free
    Label-free refers to a technique or method that does not require the use of additional labels, tags, or markers to detect or identify specific components or entities. In various scientific and technological applications, labeling often involves attaching fluorescent dyes, radioactive isotopes, or other markers to molecules, cells, or structures of interest. However, in label-free approaches, detection or analysis is performed without the need for these additional labels. Common applications...
    morphology
    In image processing, the study of structure or form of objects in an image.
    nano
    An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
    nanotube
    A nanotube, also known as a nanotubule or simply a tube-like structure, is a nanoscale cylindrical structure composed of various materials, including carbon, boron nitride, or other compounds. Nanotubes have unique physical and chemical properties due to their small size and specific atomic arrangement, making them of significant interest in various scientific and technological fields. One of the most well-known types of nanotubes is the carbon nanotube (CNT), which is composed of carbon...
    probe
    Acronym for profile resolution obtained by excitation. In its simplest form, probe involves the overlap of two counter-propagating laser pulses of appropriate wavelength, such that one pulse selectively populates a given excited state of the species of interest while the other measures the increase in absorption due to the increase in the degree of excitation.
    surface
    1. In optics, one of the exterior faces of an optical element. 2. The process of grinding or generating the face of an optical element.
    transistor
    An electronic device consisting of a semiconductor material, generally germanium or silicon, and used for rectification, amplification and switching. Its mode of operation utilizes transmission across the junction of the donor electrons and holes.
    Alexander E. RibbeAmericasatomic force microscopeBasic SciencebiomedicinecarbonChang-Hua LiuchemistryChen YangcircuitcomponentcomputercontaminationDevicediodeelectronelectronicsenergy-efficientengineeringexcited stategraphenegraphiteground statehydrogenImagingIndianaindustrialJi-Xin Chenglabel-freelight microscopemanufacturingmetallicMicroscopyMikhail N. SlipchenkomorphologynanonanoelectronicsnanomaterialsnanotubenanowireNational Science Foundationphysical chemistryPhysical Review LettersprobepulsedPurdue UniversityResearch & Technologyscreeningsemiconductorssiliconsingle wallsubstratesurfacetransient absorptiontransistorUniversity of MichiganWeldon School of Biomedical EngineeringYookyung JungZhaohui ZhongLasers

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