Graphene junction device quantumwise
The hydrogen sensitivity at room temperature using thermally evaporated palladium (Pd) nanoparticles over a graphene surface. Hydrogen sensor application using palladium (Pd) decoration over a graphene surface. Wu et al (2010) synthesized single-layer graphene by thermal CVD and showed a Mobility ~200 000 cm2 V−1 s−1), and suitable surface carrier density (~1012 cm−2). Immense promise for miniaturization in the field of gas sensors due to their 2D atomic structure, extremely high surface to volume ratio, ultra-fast electron transport (highest Of late, graphene and its oxide derivative have shown In realizing the efficient hydrogen sensors operating at different temperatures. Recentĭevelopments of nano-size carbon-based materials like CNTĪnd graphene/graphene oxide can possibly make a difference Oxides, mixed oxides etc have shown good results.
Of temperatures, using conventional semiconductors, metal Our experimental results reveal the potentiality of the graphene sensor for selective hydrogen detection at a moderately Recovery characteristics along with the reproducibility, selectivity, and stability of the Pd/Graphene junction were studied. Of the graphene-based planar device in the temperature rangeġ00 ☌–150 ☌. Subsequently we studied the hydrogen sensor behavior The domestic consumption of hydrogen as a fuel is seriously limited due to safetyĪFM. Hydrogen is widely used as a fuel for spacecraft propulsionĪnd different industrial applications. Continuous efforts to develop miniature and robust gas sensors for working over a wide range H2 leakage such that the 4% (with respect to air) explosive Storage, and transportation it is imperative to monitor the However, the idea of developing hydrogen-drivenĮngines has not been abandoned so far and is an effectiveĪgenda for a country’s economic future. (Some figures may appear in colour only in the online journal) Keywords: multilayer graphene, CVD growth, Pd-graphene planar device, hydrogen sensor,įast response and recovery, reproducible and stable Indicates the reorientation of the graphene surface after the sensing operation, most probably Related to the change in the hydrogen partial pressure and temperature.
With hydrogen, the change in the interface barrier, and the adsorption–desorption processes The gas sensing mechanism has been suggested on the basis of the interaction of palladium Was found to be selective for hydrogen relative to methane in the temperature range studied. Reproducibility, the selectivity, and the stability of the device were also studied. ☌) revealed a relatively fast response (~12 s) and recovery (~24 s) for hydrogen sensing.
The sensor performance in the temperature range (110 ☌–150 A planar device with latera l Pd metal contacts was used for Graphene film was studied by field emission scanning electron microscopy (FESEM) and byĪtomic force microscopy (AFM). An energy gap ofĠ.234 eV was determined by the optical transmission method. Spectroscopy and electron dispersive spectroscopy (EDS), respectively. The MLG and the presence of the oxide on the graphene surface were confirmed by Raman Substrate by atmospheric pressure chemical vapor deposition (APCVD). IC Design and Fabrication Centre, Department of ETCE, Jadavpur University, Kolkata, Indiaĭepartment of Electronics and Telecommunication Engineering, Indian Institute of Engineering Scienceĭepartment of Physics and Materials Science, Jaypee University of Information Technology (JUIT),ĭepartment of Physics, Jadavpur University, Kolkata, IndiaĮ-mail: 26 June 2015, revised 19 August 2015Īccepted for publication 16 September 2015Ī multilayer graphene (MLG) film was grown on thermally oxidized silicon (SiO2/Si) Please note that terms and conditions apply. View the table of contents for this issue, or go to the journal homepage for more This content has been downloaded from IOPscience. Performance of a CVD grown graphene-based planar device for a hydrogen gas sensor