dc.contributor.author |
Hazra, Arnab |
|
dc.date.accessioned |
2023-03-13T03:49:05Z |
|
dc.date.available |
2023-03-13T03:49:05Z |
|
dc.date.issued |
2015 |
|
dc.identifier.uri |
https://iopscience.iop.org/article/10.1088/0957-0233/26/11/115104 |
|
dc.identifier.uri |
http://dspace.bits-pilani.ac.in:8080/xmlui/handle/123456789/9654 |
|
dc.description.abstract |
A multilayer graphene (MLG) film was grown on thermally oxidized silicon (SiO2/Si)
substrate by atmospheric pressure chemical vapor deposition (APCVD). The formation of
the MLG and the presence of the oxide on the graphene surface were confirmed by Raman
spectroscopy and electron dispersive spectroscopy (EDS), respectively. An energy gap of
0.234 eV was determined by the optical transmission method. The surface morphology of the
graphene film was studied by field emission scanning electron microscopy (FESEM) and by
atomic force microscopy (AFM). A planar device with lateral Pd metal contacts was used for
the hydrogen sensor studies. The sensor performance in the temperature range (110 °C–150
°C) revealed a relatively fast response (~12 s) and recovery (~24 s) for hydrogen sensing. The
reproducibility, the selectivity, and the stability of the device were also studied. The sensor
was found to be selective for hydrogen relative to methane in the temperature range studied.
The gas sensing mechanism has been suggested on the basis of the interaction of palladium
with hydrogen, the change in the interface barrier, and the adsorption–desorption processes
related to the change in the hydrogen partial pressure and temperature. The AFM study
indicates the reorientation of the graphene surface after the sensing operation, most probably
due to hydrogen passivation. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
IOP |
en_US |
dc.subject |
EEE |
en_US |
dc.subject |
Multilayer graphene |
en_US |
dc.subject |
CVD growth |
en_US |
dc.subject |
Pd-graphene planar device |
en_US |
dc.subject |
Hydrogen sensor |
en_US |
dc.subject |
Fast response and recovery |
en_US |
dc.subject |
Reproducible and stable |
en_US |
dc.title |
Performance of a CVD grown graphene-based planar device for a hydrogen gas sensor |
en_US |
dc.type |
Article |
en_US |