Abstract
We report the development and testing of a novel hydrogen sensor that shows a very peculiar response to hydrogen exposure, due to its micro-structured palladium surface. The fabrication of the wrinkled Pd surface is obtained using an innovative, fast and cheap technique based on the deposition of a thin Pd film on to a thermo-retractable polystyrene sheet that shrinks to 40% of its original size when heated. The buckling of the Pd surface induced by shrinking of the substrate produces nano and micro-wrinkles on the sensor surface. The micro-structured sensor surface is very stable even after repeated hydrogen sorption/desorption cycles. The hydrogen sensing mechanism is based on the transitory absorption of hydrogen atoms into the Pd layer, leading to the reversible change of its electrical resistance. Interestingly, depending on hydrogen concentration the proposed sensor shows the concurrent effect of both the usually described behaviors of increase or decrease of resistance, related to different phenomena occurring upon hydrogen exposure and formation of palladium hydride. The study reports and discusses evidences for an activation threshold of hydrogen concentration in air switching the behavior of sensor performances from, e.g., poor negative to large positive sensitivity and from slow to fast detection.
| Original language | English |
|---|---|
| Pages (from-to) | 17529-17539 |
| Number of pages | 11 |
| Journal | International Journal of Hydrogen Energy |
| Volume | 37 |
| Issue number | 22 |
| DOIs | |
| Publication status | Published - 2012 Nov |
| Externally published | Yes |
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Keywords
- Hydrogen sensor
- Lower flammability limit
- Micro-structured surface
- Palladium film
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology
Cite this
Micro-wrinkled palladium surface for hydrogen sensing and switched detection of lower flammability limit. / Greco, F.; Ventrelli, L.; Dario, P.; Mazzolai, B.; Mattoli, V.
In: International Journal of Hydrogen Energy, Vol. 37, No. 22, 11.2012, p. 17529-17539.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Micro-wrinkled palladium surface for hydrogen sensing and switched detection of lower flammability limit
AU - Greco, F.
AU - Ventrelli, L.
AU - Dario, P.
AU - Mazzolai, B.
AU - Mattoli, V.
PY - 2012/11
Y1 - 2012/11
N2 - We report the development and testing of a novel hydrogen sensor that shows a very peculiar response to hydrogen exposure, due to its micro-structured palladium surface. The fabrication of the wrinkled Pd surface is obtained using an innovative, fast and cheap technique based on the deposition of a thin Pd film on to a thermo-retractable polystyrene sheet that shrinks to 40% of its original size when heated. The buckling of the Pd surface induced by shrinking of the substrate produces nano and micro-wrinkles on the sensor surface. The micro-structured sensor surface is very stable even after repeated hydrogen sorption/desorption cycles. The hydrogen sensing mechanism is based on the transitory absorption of hydrogen atoms into the Pd layer, leading to the reversible change of its electrical resistance. Interestingly, depending on hydrogen concentration the proposed sensor shows the concurrent effect of both the usually described behaviors of increase or decrease of resistance, related to different phenomena occurring upon hydrogen exposure and formation of palladium hydride. The study reports and discusses evidences for an activation threshold of hydrogen concentration in air switching the behavior of sensor performances from, e.g., poor negative to large positive sensitivity and from slow to fast detection.
AB - We report the development and testing of a novel hydrogen sensor that shows a very peculiar response to hydrogen exposure, due to its micro-structured palladium surface. The fabrication of the wrinkled Pd surface is obtained using an innovative, fast and cheap technique based on the deposition of a thin Pd film on to a thermo-retractable polystyrene sheet that shrinks to 40% of its original size when heated. The buckling of the Pd surface induced by shrinking of the substrate produces nano and micro-wrinkles on the sensor surface. The micro-structured sensor surface is very stable even after repeated hydrogen sorption/desorption cycles. The hydrogen sensing mechanism is based on the transitory absorption of hydrogen atoms into the Pd layer, leading to the reversible change of its electrical resistance. Interestingly, depending on hydrogen concentration the proposed sensor shows the concurrent effect of both the usually described behaviors of increase or decrease of resistance, related to different phenomena occurring upon hydrogen exposure and formation of palladium hydride. The study reports and discusses evidences for an activation threshold of hydrogen concentration in air switching the behavior of sensor performances from, e.g., poor negative to large positive sensitivity and from slow to fast detection.
KW - Hydrogen sensor
KW - Lower flammability limit
KW - Micro-structured surface
KW - Palladium film
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U2 - 10.1016/j.ijhydene.2012.04.145
DO - 10.1016/j.ijhydene.2012.04.145
M3 - Article
VL - 37
SP - 17529
EP - 17539
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 22
ER -