MoS 2 gas sensor functionalized by Pd for the detection of hydrogen
| Autor: | Dae Hyun Baek, Jongbaeg Kim |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Hydrogen Analytical chemistry chemistry.chemical_element Palladium hydride 02 engineering and technology 010402 general chemistry 01 natural sciences Hydrogen sensor chemistry.chemical_compound Materials Chemistry Work function Electrical and Electronic Engineering Instrumentation Solution process Metals and Alloys Substrate (chemistry) 021001 nanoscience & nanotechnology Condensed Matter Physics Evaporation (deposition) 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Chemical engineering Electrode 0210 nano-technology |
| Zdroj: | Sensors and Actuators B: Chemical. 250:686-691 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2017.05.028 |
| Popis: | A facile, scalable and low-cost strategy for fabricating hydrogen sensors with few-layered Pd-functionalized MoS2 according to a simple solution process is reported. The sensors were prepared by drop-casting a MoS2-containing solution onto a SiO2 substrate and functionalizing the surface of the MoS2 with Pd using evaporation. Patterned deposition of Cr/Au on top of the MoS2-coated SiO2 substrate was then performed using evaporation through a shadow mask to place the micro electrodes on the substrate. The fabricated Pd-MoS2 sensors successfully detected hydrogen gas diluted by air at room temperature. With exposure to hydrogen gas, the Pd was converted to palladium hydride, which has a lower work function than MoS2, resulting in the transfer of electrons from palladium hydride to MoS2, thereby decreasing the resistance of the sensor. The functionalized MoS2 showed a 35.3% resistance change when exposed to a 1% hydrogen-containing gas, while the pristine MoS2 showed no reaction. The lower limit of detection of the resulting functionalized MoS2 sensor was 50 ppm. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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