Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/85598
Type: Artigo de periódico
Title: Gas Sensors Based On Locally Heated Multiwall Carbon Nanotubes Decorated With Metal Nanoparticles
Author: Savu R.
Silveira J.V.
Alaferdov A.
Joanni E.
Gobbi A.L.
Canesqui M.A.
De Lara D.S.
Souza Filho A.G.
Moshkalev S.A.
Abstract: We report the design and fabrication of microreactors and sensors based on metal nanoparticle-decorated carbon nanotubes. Titanium adhesion layers and gold films were sputtered onto Si/SiO2 substrates for obtaining the electrical contacts. The gold layers were electrochemically thickened until 1 μ m and the electrodes were patterned using photolithography and wet chemical etching. Before the dielectrophoretic deposition of the nanotubes, a gap 1 μ m wide and 5 μ 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 μ L volume) were machined from a single Kovar piece, being equipped with electrical connections and 1/4′′ 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 10-5 to 10-2 W 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.
Editor: Hindawi Publishing Corporation
Rights: aberto
Identifier DOI: 10.1155/2015/260382
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-84924363719&partnerID=40&md5=d26897e468a707f98cce5fef0aeb9370
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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