NO2 gas sensing performance enhancement based on reduced graphene oxide decorated V2O5 thin films
Vijendra Singh Bhati1, D Sheela2,3, Basanta Roul2,3
1Department of Physics, Indian Institute of Technology Jodhpur, Jodhpur-342011 India.
Nanotechnology
|January 31, 2019
Summary
This study presents enhanced nitrogen dioxide (NO2) gas sensing using reduced graphene oxide (rGO) decorated vanadium pentoxide (V2O5) thin films. The novel material combination significantly improves NO2 detection, offering a promising solution for environmental monitoring.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Vanadium pentoxide (V2O5) is a semiconductor with potential gas sensing applications.
- Reduced graphene oxide (rGO) possesses unique electronic properties.
- Developing sensitive and selective gas sensors is crucial for environmental monitoring.
Purpose of the Study:
- To investigate the NO2 gas sensing properties of V2O5 thin films decorated with rGO.
- To explore the role of p-n heterojunctions in enhancing gas sensing performance.
- To evaluate the potential of rGO-decorated V2O5 for environmental NO2 detection.
Main Methods:
- Fabrication of V2O5 thin films using DC sputtering.
- Decoration of V2O5 films with rGO using the drop-cast method.
- Characterization of the gas sensing performance of the fabricated sensors at various conditions.
Main Results:
- The rGO-decorated V2O5 sensor exhibited a significantly higher NO2 response (approx. 61% increase) compared to the pristine V2O5 sensor.
- The enhanced sensing performance is attributed to the formation of p-n heterojunctions between rGO and V2O5.
- Oxygen functional groups on the rGO surface further contributed to the improved sensing capabilities.
Conclusions:
- rGO-decorated V2O5 thin films demonstrate superior NO2 gas sensing properties.
- The developed sensors are highly suitable for timely NO2 detection, aiding in ecosystem protection.
- The study highlights the potential of heterojunction engineering for advanced gas sensor development.
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