Department of Electronic Engineering, Kwangwoon University, Seoul, 139-701, Republic of Korea.
Department of Chemical Engineering, Kwangwoon University, Seoul, 139-701, Republic of Korea.
Anal Chim Acta. 2022 May 29;1209:339872. doi: 10.1016/j.aca.2022.339872. Epub 2022 Apr 26.
Here, nanocomposite-decorated laser-induced graphene-based flexible hybrid sensor is newly developed for simultaneous detection of heavy metals, pesticides, and pH in freshwater. A series of deposition methods such as drop-casting, electroplating, and heating are adopted to modify and functionalize laser-induced graphene for engineering the high-performance detection at the individual sensor. A micro-dendritic structured bismuth@tin alloy inlaid on laser-induced graphene is prepared via a simple ex-situ electrodeposition method and thermal treatment for detecting heavy metals. The electrochemical performance is evaluated through the simultaneous determination of lead and cadmium ions at the optimized deposition potential of -1.2 V for 170 s, and a wide detection concentration range of 2-250 ppb and low detection limits (1.6 ppb and 0.9 ppb, respectively) are achieved. The pesticide sensor co-modified by zirconia nanoparticles and multilayered TiCT-MXene is successfully implemented with a good linear performance for parathion after an optimal accumulation time of 120s. It realizes a low detection concentration range (0.1-5 ppb) with a detection limit of 0.06 ppb. Furthermore, a polyaniline/antimony/laser-induced graphene-based pH sensor is also integrated, showing an excellent sensitivity of -72.08 mV pH in the pH range (2-9). They are also measured and characterized in different real water samples, exhibiting an acceptable detection performance, which provides promising applicability in the on-site monitoring of pollutants in the water environment.
这里，新开发了一种基于纳米复合修饰的激光诱导石墨烯的柔性混合传感器，用于同时检测淡水环境中的重金属、农药和 pH 值。采用滴铸、电镀和加热等一系列沉积方法对激光诱导石墨烯进行修饰和功能化，以在单个传感器上实现高性能检测。通过简单的原位电沉积方法和热处理，在激光诱导石墨烯上制备了一种微枝晶结构的铋@锡合金，用于检测重金属。通过在优化的沉积电位-1.2 V 下对铅和镉离子进行同时测定，评估了电化学性能，检测浓度范围为 2-250 ppb，检测限分别为 1.6 ppb 和 0.9 ppb。经过 120 s 的最佳积累时间，成功实现了同时修饰氧化锆纳米粒子和多层 TiCT-MXene 的农药传感器，对马拉硫磷具有良好的线性性能。它实现了低检测浓度范围（0.1-5 ppb），检测限为 0.06 ppb。此外，还集成了基于聚苯胺/锑/激光诱导石墨烯的 pH 传感器，在 pH 范围（2-9）内具有-72.08 mV pH 的优异灵敏度。在不同的实际水样中进行了测量和表征，表现出可接受的检测性能，为水环境中污染物的现场监测提供了有前景的应用。
