建立了顶空进样法—芯片级非对称场离子迁移谱(Microchip-based FAIMS)技术快速识别霉变烟草。在常压条件下,以经过活性炭和分子筛净化的空气为载气,同时在正负离子模式下进行检测。在优化的条件下(载气流量2000 m L/min,顶空温度为25℃...建立了顶空进样法—芯片级非对称场离子迁移谱(Microchip-based FAIMS)技术快速识别霉变烟草。在常压条件下,以经过活性炭和分子筛净化的空气为载气,同时在正负离子模式下进行检测。在优化的条件下(载气流量2000 m L/min,顶空温度为25℃,样品气流为100 m L/min),对不同霉变程度烟草进行定性分析,建立识别规则,依据规则识别烟草霉变程度,识别率达90%以上,实现对203种烟草的快速检测。对得到不同烟草的特征峰,利用解析-气相色谱-质谱仪器(TD-GC-MS)定性分析不同霉变状态烟草的特征霉变物质,验证FAIMS测试结果。烟草特征峰在指定的CV值和DF值下,离子电流值值存在显著性差异,利于识别。方法重复性的相对标准偏差RSD≤5%。因此,FAIMS检测技术可用于快速识别霉变烟草的方法开发。展开更多
Surface acoustic wave （SAW） resonators are a type of ultraviolet （UV） light sensors with high sensitivity, and they have been extensively studied. Transparent SAW devices are very useful and can be developed into ...Surface acoustic wave （SAW） resonators are a type of ultraviolet （UV） light sensors with high sensitivity, and they have been extensively studied. Transparent SAW devices are very useful and can be developed into various sensors and microfluidics for sensing/monitoring and lab-on-chip applications. We report the fabrication of high sensitivity SAW UV sensors based on piezoelectric （PE） ZnO thin films deposited on glass substrates. The sensors were fabricated and their performances against the post-deposition annealing condition were investigated. It was found that the UV-light sensitivity is improved by more than one order of magnitude after annealing. The frequency response increases significantly and the response becomes much faster. The optimized devices also show a small temperature coefficient of frequency and excellent repeatability and stability, demonstrating its potential for UV-light sensing application.展开更多
文摘建立了顶空进样法—芯片级非对称场离子迁移谱(Microchip-based FAIMS)技术快速识别霉变烟草。在常压条件下,以经过活性炭和分子筛净化的空气为载气,同时在正负离子模式下进行检测。在优化的条件下(载气流量2000 m L/min,顶空温度为25℃,样品气流为100 m L/min),对不同霉变程度烟草进行定性分析,建立识别规则,依据规则识别烟草霉变程度,识别率达90%以上,实现对203种烟草的快速检测。对得到不同烟草的特征峰,利用解析-气相色谱-质谱仪器(TD-GC-MS)定性分析不同霉变状态烟草的特征霉变物质,验证FAIMS测试结果。烟草特征峰在指定的CV值和DF值下,离子电流值值存在显著性差异,利于识别。方法重复性的相对标准偏差RSD≤5%。因此,FAIMS检测技术可用于快速识别霉变烟草的方法开发。
基金supported by the National Natural Science Foundation of China(Grant Nos.61274037 and 61301046)the Research Fund for the Doctoral Program of Higher Education of China(Grant Nos.20120101110031 and 20120101110054)
文摘Surface acoustic wave （SAW） resonators are a type of ultraviolet （UV） light sensors with high sensitivity, and they have been extensively studied. Transparent SAW devices are very useful and can be developed into various sensors and microfluidics for sensing/monitoring and lab-on-chip applications. We report the fabrication of high sensitivity SAW UV sensors based on piezoelectric （PE） ZnO thin films deposited on glass substrates. The sensors were fabricated and their performances against the post-deposition annealing condition were investigated. It was found that the UV-light sensitivity is improved by more than one order of magnitude after annealing. The frequency response increases significantly and the response becomes much faster. The optimized devices also show a small temperature coefficient of frequency and excellent repeatability and stability, demonstrating its potential for UV-light sensing application.
