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Metal nanoparticles and DNA co-functionalized single-walled carbon nanotube gas sensors

机译:金属纳米颗粒和DNA共官能化的单壁碳纳米管气体传感器

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摘要

Metal/DNA/SWNT hybrid nanostructure-based gas sensor arrays were fabricated by means of ink jet printing of metal ion chelated DNA/SWNTs on microfabricated electrodes, followed by electroless deposition to reduce metal ions to metal. DNA served as a dispersing agent to effectively solubilize pristine SWNTs in water and as metal ion chelating centers for the formation of nanoparticles. Noble metals including palladium, platinum, and gold were used because the high binding affinity toward specific analytes enhances the selectivity and sensitivity. The sensitivity and selectivity of the gas sensors toward various gases such as H_2, H_2S, NH_3, and NO_2 were determined at room temperature. Sensing results indicated the enhancement of the sensitivity and selectivity toward certain analytes by functionalizing with different metal nanoparticles (e.g., Pd/DNA/SWNTs for H_2 and H_2S). The combined responses give a unique pattern or signature for each analyte by which the system can identify and quantify an individual gas.
机译:通过将金属离子螯合的DNA / SWNTs喷墨印刷在微型电极上,然后进行化学沉积以将金属离子还原为金属,来制造基于金属/ DNA / SWNT纳米结构杂化的气体传感器阵列。 DNA充当分散剂,可有效地溶解原始SWNTs在水中,并充当金属离子螯合中心以形成纳米颗粒。使用贵金属包括钯,铂和金,因为对特定分析物的高结合亲和力可提高选择性和灵敏度。在室温下确定气体传感器对各种气体(例如H_2,H_2S,NH_3和NO_2)的灵敏度和选择性。传感结果表明,通过使用不同的金属纳米颗粒(例如,H_2和H_2S的Pd / DNA / SWNTs)进行官能化,可以提高对某些分析物的灵敏度和选择性。组合后的响应为每种分析物提供了独特的模式或特征,系统可以通过这些特征或特征来识别和量化单个气体。

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