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Transparent carbon nanotube field emission devices for display and lamp
Cho, Yousuk,Lee, Sunhee,An, Myungchan,Kim, Dojin WILEY-VCH Verlag 2007 Physica status solidi. PSS. A, Applications and ma Vol.204 No.6
<P>A new, simple method to fabricate transparent carbon nanotube field emission devices is developed. The highly graphitized, single wall carbon nanotubes (SWNTs) are attached to an Sn/ITO glass by the arc discharge method. Post-heat treatments of the sample below the deformation temperature of soda-lime glass form a Sn–SWNT composite, and the nanotubes form good mechanical adhesion and electrical contact with the substrates. When the composite is oxidized in air below 400 °C, the Sn particles change to a transparent oxide form. The emission current density of the heat-treated SWNT–Sn composite is about 1 mA/cm<SUP>2</SUP> at an electric field of 3 V/μm. The emission current density of the SWNT–SnO<SUB>x</SUB> composite is similar. However, at a higher oxidation temperature, the emitter shows more stable emission property and longer life time. The transparency of the emitter can be useful in the design of emitter devices. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Tin-oxide nanotubes for gas sensor application fabricated using SWNTs as a template.
Hoa, Nguyen Duc,Quy, Nguyen Van,An, Myungchan,Song, Hyejin,Kang, Youngjin,Cho, Yousuk,Kim, Dojin American Scientific Publishers 2008 Journal of Nanoscience and Nanotechnology Vol.8 No.10
<P>We develop a simple method to synthesize nano tube or wire structure of tin-oxide for gas sensor application. It is realized by the rheotaxial growth and thermal oxidation (RGTO) of tin on porous single-wall carbon nanotubes (SWNTs) as a template. The morphology and chemical property of thus formed nanostructures are examined. The electrical and NO(x) gas sensing properties are also investigated. The sensor exhibits a fast response time of less than 100 seconds and a good recovery. A sensing response of 23,400% to 10 ppm concentration at 200 degrees C is observed.</P>
A high-performance triode-type carbon nanotube field emitter for mass production
Quy, Nguyen Van,Hoa, Nguyen Duc,An, Myungchan,Cho, Yousuk,Kim, Dojin IOP Pub 2007 Nanotechnology Vol.18 No.34
<P>A triode-type field emission device based on carbon nanotubes (CNTs) synthesized on an anodic aluminum oxide (AAO) template was fabricated. For the improvement of device performance, in addition to the basic advantages of using AAO to obtain uniform CNTs with strong adhesion, several considerations were taken into account, including highly crystalline CNTs synthesized through thermal chemical vapor deposition (CVD) at 1200 °C, lowering the contact resistance with a Ti buffer layer and reducing the pixel size and gate-to-emitter distance. The triode-type field emitter showed a high current density of 20 mA cm<SUP>−2</SUP> and a low turn-on voltage of 16 V. The very high field enhancement factor of 1.6 × 10<SUP>6</SUP> cm<SUP>−1</SUP> confirmed the high efficiency of the triode structure in electron extraction.</P>
One-Dimensional Tin-Oxide-Coated Single-Wall Carbon Nanotubes for Gas Sensor Applications
Nguyen Duc Hoa,Nguyen Van Quy,Li Wei,Myungchan An,송혜진,Youngjin Kang,Yousuk Cho,김도진 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.5
We introduce a simple method to synthesize one-dimensional tin-oxide-coated single-wall carbon nanotubes (SWNTs) for gas sensor applications The SWNTs are synthesized directly on a SiO2/Si substrate with comb-type electrodes via the arc-discharge method. Metallic Sn thin layers with various thicknesses are deposited over the grown SWNTs. After that, a rheotaxial and thermal oxidation is performed to spread and convert the tin metal on the surfaces of the SWNTs into tin oxide. The electrical and the NOx gas sensing properties of the sensor devices are then investigated. The as-grown SWNTs sensor exhibited a p-type semiconducting property whereas the tin-oxide- coated SWNTs exhibited an n-type semiconducting property. Moreover, the one-dimensional tin- oxidecoated SWNTs sensor exhibited a higher sensitivity than the pure SWNTs sensor. We introduce a simple method to synthesize one-dimensional tin-oxide-coated single-wall carbon nanotubes (SWNTs) for gas sensor applications The SWNTs are synthesized directly on a SiO2/Si substrate with comb-type electrodes via the arc-discharge method. Metallic Sn thin layers with various thicknesses are deposited over the grown SWNTs. After that, a rheotaxial and thermal oxidation is performed to spread and convert the tin metal on the surfaces of the SWNTs into tin oxide. The electrical and the NOx gas sensing properties of the sensor devices are then investigated. The as-grown SWNTs sensor exhibited a p-type semiconducting property whereas the tin-oxide- coated SWNTs exhibited an n-type semiconducting property. Moreover, the one-dimensional tin- oxidecoated SWNTs sensor exhibited a higher sensitivity than the pure SWNTs sensor.