Graphene-based electrochemical sensor for detection of 2,4,6-trinitrotoluene (TNT) in seawater: the comparison of single-, few-, and multilayer graphene nanoribbons and graphite microparticles.
The detection of explosives in seawater is of great interest. We compared response single-, few-, and multilayer graphene nanoribbons and graphite microparticle-based electrodes toward the electrochemical reduction of 2,4,6-trinitrotoluene (TNT). We optimized parameters such as accumulation time, accumulation potential, and pH. We found that few-layer graphene exhibits about 20% enhanced signal for TNT after accumulation when compared to multilayer graphene nanoribbons. However, graphite microparticle-modified electrode provides higher sensitivity, and there was no significant difference in the performance of single-, few-, and multilayer graphene nanoribbons and graphite microparticles for the electrochemical detection of TNT. We established the limit of detection of TNT in untreated seawater at 1 μg/mL.
Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore.
Madeline Shuhua
MS
Goh
Martin
M
Pumera
D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D055664:Electrochemical Techniques / Q000295:instrumentation / Q000379:methods*; D053834:Explosive Agents / Q000032:analysis*; D006108:Graphite / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry; D012623:Seawater / Q000032:analysis*; D014303:Trinitrotoluene / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D053834:Explosive Agents; D014874:Water Pollutants, Chemical; D014303:Trinitrotoluene; D006108:Graphite