The choice of suitable materials influences the sensor properties. Carbon materials such as graphene are promising for electrochemical sensors. Laser-induced graphene (LIG) offers a cost-effective alternative to conventional methods.
This work investigates the potential of LIG to improve electrochemical sensors by optimizing the synthesis parameters. We develop LIG-based sensors for the measurement of nitrite and 4-aminophenol in water samples.
The working electrode of the 4-aminophenol sensor was fabricated from LIG and multi-walled carbon nanotubes with polyaniline (MWCNT-PANI), which improves sensitivity and stability. For the detection of nitrite, the LIG was modified with carbon nanotubes and gold nanoparticles (f-MWCNT-AuNPs).
The LIG sensors show excellent properties. The 4-aminophenol sensor on bare LIG reaches a detection limit of 9.23 nM, with MWCNT-PANI 6 nM. The nitrite sensor on LIG/f-MWCNT-AuNPs shows linear behavior from 10 to 140 μM, with a detection limit of 0.9 μM.
The results show that LIG is suitable for versatile electrochemical sensors. The fabrication approach simplifies production and reduces costs. For the first time, an unmodified LIG electrode was used to detect 4-AP in contaminated water samples.:CHAPTER 1. INTRODUCTION
CHAPTER 2. THEORETICAL BACKGROUND ON ELECTROCHEMICAL SENSORS
CHAPTER 3. LASER-INDUCED GRAPHENE
CHAPTER 4. ENHANCEMENT OF LIG ELECTROCHEMICAL SENSORS
CHAPTER 5. 4-AMINOPHENOL DETECTION IN PARACETAMOL AND WATER SAMPLES USING LIG MODIFIED BY MWCNT-PANI
CHAPTER 6. NITRITE DETECTION IN WATER SAMPLES USING LIG FUNCTIONALIZED BY F-MWCNT AND AUNPS
CHAPTER 7. CONCLUSION
APPENDIX
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:90748 |
| Date | 12 June 2024 |
| Creators | Nasraoui, Salem |
| Contributors | Kanoun, Olfa, Ben Ali, Mounir, Errachid, Abdelhamid, Technische Universität Chemnitz |
| Publisher | Universitätsverlag Chemnitz |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:doctoralThesis, info:eu-repo/semantics/doctoralThesis, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | urn:nbn:de:bsz:ch1-qucosa-209652, qucosa:20552 |
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