A graphene/gold-coated surface plasmon sensor for sodium nitrate detection
A sodium nitrate sensor with graphene/gold coating is presented in this paper. A Kretschmann setup with angle interrogation was used to detect sodium nitrate in the range of 0-15%. Using a graphene coating on top of the 50 nm gold layer showed an improvement in the sensitivity of the sensor. The gol...
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| Main Authors: | , , , , |
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| Format: | Article |
| Published: |
MDPI
2022
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| Subjects: | |
| Online Access: | http://eprints.um.edu.my/41409/ |
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| Summary: | A sodium nitrate sensor with graphene/gold coating is presented in this paper. A Kretschmann setup with angle interrogation was used to detect sodium nitrate in the range of 0-15%. Using a graphene coating on top of the 50 nm gold layer showed an improvement in the sensitivity of the sensor. The gold-coated setups had a sensitivity of 0.198 degrees/%. In contrast, the graphene/gold-coated samples showed a sensitivity of 0.244 degrees/% due to the charge transfer between the graphene and the gold and the resulting excited solid electric field. The graphene/gold-coated sensor showed good stability with time in the temperature range of 19-34 degrees C. This shows that this setup may be beneficial in detecting sodium nitrate. |
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