Environmentally Friendly Disposable Sensor with Microfabricated On-Chip Planar Carbon Electrode for Heavy Metal Ion Measurement

• Main Authors: YU,SHIN-YI, 游欣怡
• Other Authors: CHENG,KEN-FA
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/27653199132010450998

碩士 === 國防大學理工學院 === 化學工程碩士班 === 104 === The major work in this paper is the development of a disposable heavy metal sensor with on-chip planar chitosan-carbon nanotubes modified carbon working electrode, integrated Ag/AgCl reference electrode, and microfluidic channels by using standard screen-printing technology. The morphology of the chitosan-MWCNTs film surface was characterized using a field-emission scanning electron microscope (SEM). The mechanisms of interaction of chitosan with metal ions were investigated by X-ray photoelectron spectroscopy (XPS). The proposed sensor targets very low cost and mass production, small analytic consumption and waste generation, fast sensing time, and ease of use. This sensor is also suited for fast in situ environmental monitoring. The working electrodes were successfully used as electrochemical sensor for individual and simultaneous detection of Pb2+, Hg2+ , As3+ and Cu2+ in 0.2 M CH3COOH by square-wave stripping voltammetry (SWV). The developed sensor showed good linear behavior in the examined concentration. For individual Pb2+, Hg2+ , As3+ and Cu2+ ion detection, a limit of detection was 5.0ppm, 1.0ppm , 30.0ppm and 0.5ppm, respectively. In addition, based on the results, an adsorption mechanism is proposed. We have explored the adsorption properties of biodegradable material of crosslinked chitosan-carbon nanotubes, which can be utilized for the removal of heavy metal ions from waste water.