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Titanium adhesion layers and gold films were sputtered onto Si\/SiO<jats:sub>2<\/jats:sub>substrates for obtaining the electrical contacts. The gold layers were electrochemically thickened until 1\u2009<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M1\"><mml:mrow><mml:mi>\u03bc<\/mml:mi><\/mml:mrow><\/mml:math>m and the electrodes were patterned using photolithography and wet chemical etching. Before the dielectrophoretic deposition of the nanotubes, a gap 1\u2009<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M2\"><mml:mrow><mml:mi>\u03bc<\/mml:mi><\/mml:mrow><\/mml:math>m wide and 5\u2009<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M3\"><mml:mrow><mml:mi>\u03bc<\/mml:mi><\/mml:mrow><\/mml:math>m deep was milled in the middle of the metallic line by focused ion beam, allowing the fabrication of sensors based on suspended nanotubes bridging the electrodes. Subsequently, the sputtering technique was used for decorating the nanotubes with metallic nanoparticles. In order to test the as-obtained sensors, microreactors (100\u2009<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" id=\"M4\"><mml:mrow><mml:mi>\u03bc<\/mml:mi><\/mml:mrow><\/mml:math>L volume) were machined from a single Kovar piece, being equipped with electrical connections and 1\/4\u2032\u2032 Swagelok-compatible gas inlet and outlets for controlling the atmosphere in the testing chamber. The sensors, electrically connected to the contact pins by wire-bonding, were tested in the 10<jats:sup>\u22125<\/jats:sup>to 10<jats:sup>\u22122<\/jats:sup>\u2009W working power interval using oxygen as target gas. The small chamber volume allowed the measurement of fast characteristic times (response\/recovery), with the sensors showing good sensitivity.<\/jats:p>","DOI":"10.1155\/2015\/260382","type":"journal-article","created":{"date-parts":[[2015,2,22]],"date-time":"2015-02-22T16:00:53Z","timestamp":1424620853000},"page":"1-8","source":"Crossref","is-referenced-by-count":5,"title":["Gas Sensors Based on Locally Heated Multiwall Carbon Nanotubes Decorated with Metal Nanoparticles"],"prefix":"10.1155","volume":"2015","author":[{"given":"R.","family":"Savu","sequence":"first","affiliation":[{"name":"Centro de Componentes Semicondutores (CCS), Universidade Estadual de Campinas (UNICAMP), CP 6061, Rua Jo\u00e3o Pandia Cal\u00f3geras 90, 13083-870 Campinas, SP, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J. 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