| dc.creator | Paulino Cordero, Leandro Guillermo | |
| dc.creator | Fonseca, Luis (Consejero) | |
| dc.date | 2015-12-08T14:26:17Z | |
| dc.date | 2015-12-08T14:26:17Z | |
| dc.date | 2015-12-08T14:26:17Z | |
| dc.date.accessioned | 2017-03-17T16:54:48Z | |
| dc.date.available | 2017-03-17T16:54:48Z | |
| dc.identifier | http://hdl.handle.net/10586 /563 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/647681 | |
| dc.description | Gas sensors based on semiconducting metal oxides are commonly used in the
markets of automotive, aerospace and logistic applications due to their stability and
favorable response while monitoring toxic and combustible gases, being the main
drawback their operating temperature. In particular, semiconducting molybdenum
oxide (MoO3) has been proved to be highly sensitive to NO2, NH3, CO, H2, among
others, in the temperature range between 300 °C and 450 °C. The goal of this work is
to reduce the operating temperature of a MoO3 based sensor prototype by developing
an oxide-metal composite with catalytic properties.
Orthorhombic MoO3 microbelts were synthesized by Chemical Vapor Deposition
in two stages using MoCl5 precursor powders. The as-synthesized material was
liquid exfoliated to reduce sample’s thickness to the nanoscale and, at the same time,
its electrical resistance. Finally, platinum ions were added by 9 keV Pt-ion irradiation
to serve as catalyst during hydrogen gas exposure. XRD was used to confirm successful
synthesis of the material; SEM to assess the thickness reduction and to retrieve
EDS spectra to confirm successful Pt-ion deposition over liquid exfoliated MoO3.
Pt-MoO3 samples were integrated to gold interdigitated electrodes and later
heated at 300°C for 15 minutes to ensure connectivity between MoO3 and the electrodes,
with the goal of performing gas sensing tests on the device. The sensor showed
response to H2 gas at 100°C, 50°C and room temperature at different concentrations. | |
| dc.language | en | |
| dc.subject | Gas Sensor | |
| dc.subject | Hydrogen Sensor | |
| dc.subject | Molybdenum oxide (MoO3) | |
| dc.subject | Chemical vapor deposition | |
| dc.subject | Semiconducting metal oxides | |
| dc.subject | Toxic gas | |
| dc.subject | Combustible gases | |
| dc.title | Pt-Ion Irradiated MoO3: Synthesis and its Applicability in Hydrogen Sensor Devices | |
| dc.type | Tesis | |
