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Colorimetric Sensors: Temperature‐Activated Reverse Sensing Behavior of Pd Nanowire Hydrogen Sensors (Small 2/2013)
Author(s) -
Yang Dachi,
Valentín Luis,
Carpena Jennifer,
Otaño Wilfredo,
Resto Oscar,
Fonseca Luis F.
Publication year - 2013
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201370013
Subject(s) - nanowire , materials science , electrode , microelectromechanical systems , hydrogen , nanotechnology , hydrogen sensor , optoelectronics , molecule , palladium , catalysis , chemistry , biochemistry , organic chemistry
The image shows an artistic version of a Pd nanowire surrounded by hydrogen molecules. The nanowire is electrically connected to the Pt electrodes of a sensor device by L. F. Fonseca and co‐workers to study the effects of reduced temperature on its electrical response during hydrogen gas exposure. The TEM image shows the ordered crystal structure of the material. As described on page 188 , when temperature is reduced, a crossover from a bulk‐ to a percolationcontrolled response is observed. This effect was confirmed in nanowires arrays on interdigitated electrodes and single nanowires integrated to MEMS devices.