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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Esfandyarpour, B. Soleimani, E.S. |
| Copyright Year | 2006 |
| Description | Author affiliation: Dept. of Electr. & Comput. Eng., Tehran Univ. (Esfandyarpour, B.) |
| Abstract | Nanocrystalline thin film tin-oxide microsensors were fabricated on $Si_{3}N_{4}$ membranes using standard lithography process for the fast detection of reducing gases. The sensing material was spin-coated over platinum electrode contacts with various thicknesses using a sol-gel method. Subsequently, the spin-coated film was gradually heated up to 200 degC in an extended period of 150 mins. After the preannealing process, various thicknesses of platinum were deposited onto the tin oxide surface. Subsequently, platinum layers sputtered on tin-oxide thin films were annealed at different temperatures up to 850 degC in a quartz tube furnace. Due to the high porosity of the films, Pt nanoclusters are formed on the surface of tin-oxide thin films during the postannealing process. The size of crystallites changes from 20 to 200 nm depending on the platinum thickness and the postannealing process. Conductivity measurements of the sensors annealed at different temperatures have been carried out in dry air and in presence of various concentrations of CO, $H_{2}$ and ethanol. The response time of sensors for detection of reducing gases was less than 5s. TEM, SEM and XRD analyses were used to investigate the surface morphology and the crystallinity of SnO2 films |
| Starting Page | 1625 |
| Ending Page | 1628 |
| File Size | 287589 |
| Page Count | 4 |
| File Format | |
| ISBN | 1424400384 |
| DOI | 10.1109/CCECE.2006.277829 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2006-05-07 |
| Publisher Place | Canada |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Thin film sensors Platinum Tin Sputtering Surface morphology Gases Annealing Crystallization Temperature sensors Semiconductor thin films sol-gel fast response Microgas sensor thin film tin-oxide Pt nanoclusters |
| Content Type | Text |
| Resource Type | Article |
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