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Microchannel–engraved and Cu–dispersed Carbon Nanocomposite Film as a Chemiresistive Sensor for Aqueous Metal Ions
Chemical Engineering Science ( IF 4.7 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.ces.2020.116282
Ashish Yadav , Amit Kumar , Nishith Verma

Abstract A Cu-carbon nanocomposite film (2 mm thickness) is fabricated as an efficient chemiresistive sensor for aqueous Cd. The novelty of the study is in fabrication of the laser-ablated vertical microchannels (200 µm wide x 100 µm deep x 200 µm inter-spacing) on both sides of the carbon film. The microchannels speed up sensing by inducing a reproducible capillary action in the film, with a rapid rise of the liquid and wetting of the material, and augmenting exposure of the electroconductive Cu nanoparticles to the analyte through the porous textured walls. Capillary action and wetting are facilitated by hydrophilic functional groups in the material. Notably, the sensor response (electrical resistance of the film) is approximately linear (R2 = 0.977) over the concentration range 10 – 150 ppb. The microfluidics-based approach used in this study can be easily extended to develop fast chemiresistive sensors for biofluids, and the other metals in wastewater.

中文翻译:

微通道雕刻和铜分散的碳纳米复合膜作为水性金属离子的化学电阻传感器

摘要 制备了一种铜碳纳米复合膜(2 mm 厚)作为一种高效的 Cd 化学电阻传感器。该研究的新颖之处在于在碳膜两侧制造激光烧蚀垂直微通道(200 µm 宽 x 100 µm 深 x 200 µm 间距)。微通道通过在薄膜中诱导可重复的毛细管作用来加速传感,液体的快速上升和材料的润湿,以及通过多孔纹理壁增加导电铜纳米颗粒对分析物的暴露。材料中的亲水性官能团促进了毛细作用和润湿。值得注意的是,传感器响应(薄膜的电阻)在 10 – 150 ppb 的浓度范围内近似线性(R2 = 0.977)。
更新日期:2021-02-01
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