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- W1964617792 abstract "Recently, one-dimensional semiconducting nanomaterials have attracted considerable interest for their potential as building blocks for fabricating various nanodevices. Among these semiconducting nanomaterials,, <TEX>$SnO_2$</TEX> nanostructures including nanowires, nanorods, nanobelts, and nanotubes were successfully synthesized and their electrochemical properties were evaluated. Although <TEX>$SnO_2$</TEX> nanowires and nanobelts exhibit fascinating gas sensing characteristics, there are still significant difficulties in using them for device applications. The crucial problem is the alignment of the nanowires. Each nanowire should be attached on each die using arduous e-beam or photolithography, which is quite an undesirable process in terms of mass production in the current semiconductor industry. In this study, a simple process for making sensitive <TEX>$SnO_2$</TEX> nanowire-based gas sensors by using a standard semiconducting fabrication process was studied. The nanowires were aligned in-situ during nanowire synthesis by thermal CVD process and a nanowire network structure between the electrodes was obtained. The <TEX>$SnO_2$</TEX> nanowire network was floated upon the Si substrate by separating an Au catalyst between the electrodes. As the electric current is transported along the networks of the nanowires, not along the surface layer on the substrate, the gas sensitivities could be maximized in this networked and floated structure. By varying the nanowire density and the distance between the electrodes, several types of nanowire network were fabricated. The <TEX>$NO_2$</TEX> gas sensitivity was 30~200 when the <TEX>$NO_2$</TEX> concentration was 5~20ppm. The response time was ca. 30~110 sec." @default.
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- W1964617792 date "2010-04-01" @default.
- W1964617792 modified "2023-10-18" @default.
- W1964617792 title "SnO2 Semiconducting Nanowires Network and Its NO2 Gas Sensor Application" @default.
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- W1964617792 doi "https://doi.org/10.3740/mrsk.2010.20.4.223" @default.
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