Martins Vitor H N, da Silva Monize M, Gonçalves Daniel A, Presser Volker, Husmann Samantha, Souza Victor H R
Faculty of Exact Science and Technology, Universidade Federal da Grande Dourados, Dourados, Mato Grosso do Sul 79804-970, Brazil.
INM-Leibniz Institute for New Materials, Campus D2-2, 66123 Saarbrücken, Germany.
ACS Omega. 2024 Jul 10;9(29):31569-31577. doi: 10.1021/acsomega.4c01457. eCollection 2024 Jul 23.
Developing thin, freestanding electrodes that work simultaneously as a current collector and electroactive material is pivotal to integrating portable and wearable chemical sensors. Herein, we have synthesized graphene/Prussian blue (PB) electrodes for hydrogen peroxide detection (HO) using a two-step method. First, an reduced graphene oxide/PAni/FeO freestanding film is prepared using a doctor blade technique, followed by the electrochemical deposition of PB nanoparticles over the films. The iron oxide nanoparticles work as the iron source for the heterogeneous electrochemical deposition of the nanoparticles in a ferricyanide solution. The size of the PB cubes electrodeposited over the graphene-based electrodes was controlled by the number of voltammetric cycles. For HO sensing, the PB10 electrode achieved the lowest detection and quantification limits, 2.00 and 7.00 μM, respectively. The findings herein evidence the balance between the structure of the graphene/PB-based electrodes with the electrochemical performance for HO detection and pave the path for developing new freestanding electrodes for chemical sensors.
开发同时作为集流体和电活性材料的超薄独立电极对于集成便携式和可穿戴化学传感器至关重要。在此，我们采用两步法合成了用于过氧化氢检测（HO）的石墨烯/普鲁士蓝（PB）电极。首先，使用刮刀技术制备还原氧化石墨烯/聚苯胺/FeO独立膜，然后在膜上电化学沉积PB纳米颗粒。氧化铁纳米颗粒作为铁源，用于在铁氰化物溶液中异相电化学沉积纳米颗粒。沉积在石墨烯基电极上的PB立方体的尺寸由伏安循环次数控制。对于HO传感，PB10电极实现了最低的检测限和定量限，分别为2.00和7.00 μM。本文的研究结果证明了石墨烯/PB基电极结构与HO检测电化学性能之间的平衡，并为开发用于化学传感器的新型独立电极铺平了道路。
