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      Application of carbon nanotube field emission effect to an ionization gauge

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      Applied Physics Letters
      AIP Publishing

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          Fully sealed, high-brightness carbon-nanotube field-emission display

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            Miniaturized gas ionization sensors using carbon nanotubes.

            Gas sensors operate by a variety of fundamentally different mechanisms. Ionization sensors work by fingerprinting the ionization characteristics of distinct gases, but they are limited by their huge, bulky architecture, high power consumption and risky high-voltage operation. Here we report the fabrication and successful testing of ionization microsensors featuring the electrical breakdown of a range of gases and gas mixtures at carbon nanotube tips. The sharp tips of nanotubes generate very high electric fields at relatively low voltages, lowering breakdown voltages several-fold in comparison to traditional electrodes, and thereby enabling compact, battery-powered and safe operation of such sensors. The sensors show good sensitivity and selectivity, and are unaffected by extraneous factors such as temperature, humidity, and gas flow. As such, the devices offer several practical advantages over previously reported nanotube sensor systems. The simple, low-cost, sensors described here could be deployed for a variety of applications, such as environmental monitoring, sensing in chemical processing plants, and gas detection for counter-terrorism.
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              Fabrication and electrical characteristics of carbon nanotube field emission microcathodes with an integrated gate electrode

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                Author and article information

                Journal
                Applied Physics Letters
                Appl. Phys. Lett.
                AIP Publishing
                0003-6951
                1077-3118
                October 24 2005
                October 24 2005
                : 87
                : 17
                : 173104
                Article
                10.1063/1.2112184
                865a4992-a415-44c9-a451-389dc4b43259
                © 2005
                History

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