| Summary: | 碩士 === 國立交通大學 === 應用化學系碩博士班 === 105 === The heavy metal pollution owing to the rapid industrial development has been long an environmental issue which attracted lots of attention. Conventional heavy metal analysis usually can be achieved by atomic absorption spectrometry (AA), atomic emission spectrometry (AES), atomic fluorescence spectrometry (AFS), or inductively coupled plasma mass spectrometry (ICP-MS). These techniques provide reliable measurement in quantification of heavy metal ion; however, they are costly and are not portable, limiting the flexibility for quick in situ water testing. As a result, gold nanoparticle-based sensors have been extensively investigated to enable heavy metal ion analysis. Beside the well-known colorimetric methods, recently, chemiresistor sensor has become a newly developed analytical strategy. Although such type of sensors could be of mobile capabilities, cost-effectiveness and facilitates real-time monitoring, the improvements in the accuracy, selectivity and sensitivity are required, which potentially could be achieved by optimizing the surface modification of the devices. In this study we aimed to investigate the influence of the varied diameters and the interparticle distance of gold nanoparticles on resistance-based metal ion (Cadmium) detection. In addition, a comparison of the performance between the chemiresistor sensor and the colorimetric method was summarized. We foresee to eventually delineate optimized parameters (particle diameter and spacing) for the future AuNP-based heavy metal chemiresistor sensor development
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