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      The role of morphology and crystallographic structure of metal oxides in response of conductometric-type gas sensors

      Materials Science and Engineering: R: Reports

      Elsevier BV

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          Nanotube molecular wires as chemical sensors

          Chemical sensors based on individual single-walled carbon nanotubes (SWNTs) are demonstrated. Upon exposure to gaseous molecules such as NO(2) or NH(3), the electrical resistance of a semiconducting SWNT is found to dramatically increase or decrease. This serves as the basis for nanotube molecular sensors. The nanotube sensors exhibit a fast response and a substantially higher sensitivity than that of existing solid-state sensors at room temperature. Sensor reversibility is achieved by slow recovery under ambient conditions or by heating to high temperatures. The interactions between molecular species and SWNTs and the mechanisms of molecular sensing with nanotube molecular wires are investigated.
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            Nanobelts of semiconducting oxides.

            Ultralong beltlike (or ribbonlike) nanostructures (so-called nanobelts) were successfully synthesized for semiconducting oxides of zinc, tin, indium, cadmium, and gallium by simply evaporating the desired commercial metal oxide powders at high temperatures. The as-synthesized oxide nanobelts are pure, structurally uniform, and single crystalline, and most of them are free from defects and dislocations. They have a rectanglelike cross section with typical widths of 30 to 300 nanometers, width-to-thickness ratios of 5 to 10, and lengths of up to a few millimeters. The beltlike morphology appears to be a distinctive and common structural characteristic for the family of semiconducting oxides with cations of different valence states and materials of distinct crystallographic structures. The nanobelts could be an ideal system for fully understanding dimensionally confined transport phenomena in functional oxides and building functional devices along individual nanobelts.
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              Size- and support-dependency in the catalysis of gold

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                Author and article information

                Journal
                Materials Science and Engineering: R: Reports
                Materials Science and Engineering: R: Reports
                Elsevier BV
                0927796X
                May 2008
                May 2008
                : 61
                : 1-6
                : 1-39
                Article
                10.1016/j.mser.2008.02.001
                © 2008

                http://www.elsevier.com/tdm/userlicense/1.0/

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