报告题目：Low-cost optoelectronic sensors for gas monitoring in diverse environments
报告人：陈 宇
报告时间：2018年5月8日（周二）下午14:30
报告地点：福州大学国家大学科技园 阳光科技大厦 北911室
邀请单位：福州大学生物药光动力治疗技术国家地方联合工程研究中心
报告摘要：
Gas sensors are used extensively in monitoring of the environment. Many volatile organic compound gases found in the environment severely impact the health of an individual. Volatile organic compounds are also present in food odors (i.e. fruits, coffee, poultry) and can be used as an effective indicator of food freshness. For these sensors to be used en masse, they need to be affordable, sensitive, user-friendly, easy to fabricate, and ecofriendly. Thus the objective is design, fabricate, test and validate low-cost optoelectronic sensor arrays for some targeted application in medical diagnostics and food quality monitoring.
Towards this goal, cellulosic paper is among the most promising substrates, since it is inexpensive, flexible, lightweight, portable and biodegradable. Several paper-based gas sensor platforms functionalized with different gas sensitive elements (e.g. chemo-responsive dyes, conductive nanomaterials) have been presented for gas detection in diverse environments. These sensing platforms include a paper-based microfluidic platform functionalized with an array of chemo-responsive dyes for Selective sensing of dissolved ammonia and carbon dioxide with ppm level sensitivity; a disposable food sensor made on paper substrate with colorimetric microbeads arrays arranged as a geometric barcode to monitor the food spoilage; and a paper based optoelectronic platform with combined optical and electrical chemi-resistive sensor arrays used for sensing and discriminating several volatile gases and mixtures.
Another part of work includes a couple of sensor platforms with dye-contained colorimetric microbeads as the core sensing element. These works include a microfluidic sensing platform incorporating colorimetric beads for detection of ammonia concentration in saliva with sub-ppm sensitivity; the colorimetric beads embedded hydrogel fiber used to monitor the pH of the skin for wound monitoring.
These works lay the foundation of low cost mass produced gas sensors for applications in environment, food and health.
报告人简介：
个人教育经历：
博士，电子工程系，塔夫茨大学 (Tufts University)，美国
硕士，微电子学（联合培养）
南洋理工大学 (Nanyang Technological University), 新加坡
慕尼黑工业大学 (Technical University of Munich), 德国
学士，光电信息工程， 南京理工大学，
科研简介：
主要从事以电子技术，光学检测为基础，结合生物医学应用的跨学科研究。主要致力于研究纸基生物传感器(paper-based biosensor)，微流体系统(PDMS,Hydrogel and paper based microfluidic sensor)等，并将光谱检验融入智能手机诊疗，实现了对各种生物标记(biomarker)的定性和定量测试，完成了对待测信号的采集，传输，分析和结果输出的一体化集成。
主要科研项目：
纸基气体检测传感器
§ 应用纸质材料设计能够承载含有光学染料的微流体平台；
§ 选择对二氧化碳和氨气敏感的光学染料，将其凝固在纸基衬底疏水处理后的探测区；
§ 用平板扫仪实现对光谱信号的采集，用Matlab实现对光谱信息的量化。
纸基食品检测传感器
§ 以纸质材料为衬底将不同种类的光学染料以不同几何图形的形式嵌入；
§ 以盖章打印的方式实现对器件的大量重复生产；
§ 以智能手机为探测器实现对颜色信息的采集和传输。
纳米材料集成的光电传感器应用于气体探测
§ 设计了一个融合了各种纳米材料（高聚物，金属氧化物，碳纳米管）的纸纤维衬底光电传感器；
§ 设计了传感器的包装和周围的信号探测电路；
§ 实现多路电学和光学信号探测。
应用于胃部气体测试的功能化光纤
§ 设计了具有生物兼容性的嵌入式光纤实现反射光信号的采集；
§ 实现了将多样化交叉反应的光学染料集成到嵌入式光纤；
§ 用光谱分析仪实现对光纤传感器的信号的采集和分析。
微流体平台唾液检测光谱分析
§ 应用PDMS材料设计能够承载含有光学染料的二氧化硅微粒的微流体平台；
§ 选择对唾液中两大生物标志物（二氧化碳和氨）敏感的光学染料，将其合成入二氧化硅微粒；
§ 用光谱分析仪实现对光纤传感器的信号的采集和分析。
参与哈佛医学院科研项目
§水凝胶光纤用于检测皮肤pH值；
§ 应用具有生物兼容性的水凝胶为载体，将对pH敏感的光学染料合成入水凝胶；
§ 将含有光学染料的水凝胶制成微米级的光纤，集成在医用胶布上；
§ 用智能手机实现光谱信号的采集和传输，应用Matlab软件实现对光信号强度的量化
水凝胶悬浮pH检测计；
§ 应用改性后的水凝胶与光学染料结合设计能够悬浮于液体中的球形胶体；
§ 用光谱检测的方法实现对光信号变化的探测。
