Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand.
Research and Development Division, T. Robotics, Co., Ltd., Khon Kaen 40000, Thailand.
Sensors (Basel). 2023 Mar 14;23(6):3099. doi: 10.3390/s23063099.
In this work, we report a low-cost and highly sensitive electrochemical sensor for detecting As(III) in water. The sensor uses a 3D microporous graphene electrode with nanoflowers, which enriches the reactive surface area and thus enhances its sensitivity. The detection range achieved was 1-50 ppb, meeting the US-EPA cutoff criteria of 10 ppb. The sensor works by trapping As(III) ions using the interlayer dipole between Ni and graphene, reducing As(III), and transferring electrons to the nanoflowers. The nanoflowers then exchange charges with the graphene layer, producing a measurable current. Interference by other ions, such as Pb(II) and Cd(II), was found to be negligible. The proposed method has potential for use as a portable field sensor for monitoring water quality to control hazardous As(III) in human life.
在这项工作中，我们报告了一种用于检测水中 As(III) 的低成本、高灵敏度电化学传感器。该传感器使用具有纳米花的 3D 微孔石墨烯电极，其丰富了反应表面积，从而提高了其灵敏度。实现的检测范围为 1-50 ppb，符合美国环保署 10 ppb 的截止标准。该传感器通过利用 Ni 和石墨烯之间的层间偶极子捕获 As(III)离子，还原 As(III)并将电子转移到纳米花上来工作。纳米花然后与石墨烯层交换电荷，产生可测量的电流。发现其他离子（如 Pb(II)和 Cd(II)）的干扰可以忽略不计。该方法有望用作便携式现场传感器，用于监测水质，以控制人类生活中的有害 As(III)。
