Porous carbon-based nanomaterials have attracted much attention because of their specific structure and multifunctionality. We report on a strategy for constructing porous microparticles consisting of carbon nanotubes (CNTs) connected with honeycomb nanopores and their application for electrochemical sensors. The microdroplets containing silica nanoparticles (SiO₂NPs) and CNTs are created using a microfluidic device, with droplet size and composition being tunable via the fluidic phases. Solid microparticles consisting of close-packed SiO₂NPs and CNTs (SiO₂NP-CNT-μPs) are obtained after water evaporation and calcination. Target honeycomb CNT-microparticles (h-CNT-μPs) are achieved after removing SiO₂NPs from the SiO₂NP-CNT-μPs. The glassy carbon electrodes (GCEs) modified with h-CNT-μPs and Nafion (h-CNT-μPs/Nafion/GCEs) show highly enhanced specific surface area and electrocatalytic activity. Under optimized conditions, h-CNT-μPs/Nafion/GCEs exhibit linear response to methyl parathion (MP) in the concentration ranges of 0.3–20.0 μM and 20.0–150.0 μM with the limit of detection of 0.092 μM (S/N = 3), showing good sensitivity, selectivity, reproducibility and anti-interference. Prepared electrochemical sensors have also been applied for determination of MP in practical samples of tomato and cabbage, showing comparable results to those measured using a high-performance liquid chromatography (HPLC). This proposed strategy is highly efficient for constructing microscale sensor units considering their size, uniformity and compositions, providing a reliable way for monitoring pesticide and other active components in fruits, vegetables and other scenarios of agricultural and industrial production.

多孔碳基纳米材料因其特殊的结构和多功能性而备受关注。我们报告了一种构建由与蜂窝状纳米孔相连的碳纳米管（CNT）组成的多孔微粒的策略及其在电化学传感器中的应用。使用微流体装置可产生包含二氧化硅纳米颗粒（SiO ₂ NPs）和CNT的微滴，微滴的大小和组成可通过液相进行调节。由紧密堆积的SiO的固体微粒₂的NP和碳纳米管（SIO ₂ NP-CNT-的μP）的水蒸发和煅烧后获得的。去除SiO ₂后获得目标蜂窝状CNT微粒（h - CNT- μPs）从在SiO的NP ₂ NP-CNT-的μP。用h -CNT-μPs和Nafion（h -CNT-μPs/ Nafion / GCEs ）修饰的玻璃碳电极（GCE）显示出大大提高的比表面积和电催化活性。在优化条件下，h-CNT-μPs/ Nafion / GCE在0.3–20.0μM和20.0–150.0μM的浓度范围内表现出对甲基对硫磷（MP）的线性响应，检出限为0.092μM（S / N = 3），显示出良好的灵敏度，选择性，可重复性和抗干扰性。制备的电化学传感器也已用于测定番茄和大白菜的实际样品中的MP，与使用高效液相色谱（HPLC）测得的结果相近。考虑到其尺寸，均匀性和组成，该拟议的策略对于构建微型传感器单元非常有效，为监测水果，蔬菜以及其他农业和工业生产场景中的农药和其他活性成分提供了可靠的方法。