Silva Michele V C O, Carvalho Mayane S, Silva Luiz R G, Rocha Raquel G, Cambraia Luciana V, Janegitz Bruno C, Nossol Edson, Muñoz Rodrigo A A, Richter Eduardo M, Stefano Jéssica S
Institute of Chemistry, Federal University of Uberlândia, Uberlândia, Minas Gerais, 38400-902, Brazil.
Department of Nature Sciences, Mathematics and Education, Federal University of São Carlos, Araras, São Paulo, 13600-970, Brazil.
Mikrochim Acta. 2024 Sep 29;191(10):633. doi: 10.1007/s00604-024-06720-7.
The development of a tailored filament is reported composed of reduced graphene oxide (rGO) and carbon black (CB) in a polylactic acid (PLA) matrix and its use in the production of electrochemical sensors. The electrodes containing rGO showed superior performance when compared with those prepared in the absence of this material. Physicochemical and electrochemical characterizations of the electrodes showed the successful incorporation of both rGO and CB and an improved conductivity in the presence of rGO (lower resistance to charge transfer). As a proof-of-concept, the developed electrodes were applied to the detection of the forensic analytes TNT and cocaine. The electrodes containing rGO presented a superior analytical performance for both TNT and cocaine detection, showing the lower limit of detection values (0.22 and 2.1 µmol L, respectively) in comparison with pure CB-PLA electrodes (0.93 and 11.3 µmol L, respectively). Besides, better-defined redox peaks were observed, especially for TNT, as well as increased sensitivity for both molecules.
据报道，一种定制长丝已研发成功，其由聚乳酸（PLA）基质中的还原氧化石墨烯（rGO）和炭黑（CB）组成，并用于生产电化学传感器。与未使用该材料制备的电极相比，含rGO的电极表现出卓越性能。电极的物理化学和电化学表征表明，rGO和CB均成功掺入，且在存在rGO的情况下导电性得到改善（电荷转移电阻更低）。作为概念验证，所研发的电极被应用于法医分析物三硝基甲苯（TNT）和可卡因的检测。含rGO的电极在TNT和可卡因检测方面均呈现出卓越的分析性能，与纯CB-PLA电极相比，检测下限值更低（分别为0.22和2.1 μmol/L，而纯CB-PLA电极分别为0.93和11.3 μmol/L）。此外，观察到更清晰的氧化还原峰，尤其是对于TNT，并且对两种分子的灵敏度均有所提高。
