Microdroplet-Based Organic Vapour Sensor on a Disposable GO-Chitosan Flexible Substrate
Microdroplet-Based Organic Vapour Sensor on a Disposable GO-Chitosan Flexible Substrate
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DOI：
10.1109/jsen.2020.2992087
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发表时间：
2020-07-15
影响因子：
4.3
通讯作者：
Dahiya, Ravinder S.
中科院分区：
文献类型：
--
作者：
Bhattacharjee, Mitradip;Vilouras, Anastasios;Dahiya, Ravinder S.
随着环境中有害有机蒸气的增加，挥发性有机蒸气化合物（VOCs）的检测变得越来越重要。为此，本文提出了一种基于导电液滴的一次性传感器。与传统传感器不同，液滴系统易于更换，并且能够基于表面张力梯度检测多种蒸汽。本文提出的化学电阻传感器是在2.5 μ m厚的超柔性氧化石墨烯-壳聚糖（GOC）上制造的，Pt电极具有60 μ m的间隙。GO与壳聚糖中的多糖基团之间的静电相互作用和强氢键为液滴提供了可调的疏水性和稳定性。用类似于10 μ L的aq. NaCl作为分散在Pt电极之间的活性传感材料，观察到液滴在VOC存在下显示出14-21%的电阻变化。同时设计了一个读出电路，用于读取液滴传感器的数据。本传感器的响应时间（3-4秒）明显优于其固态传感器。具有吸引力的功能，如一次性，负担得起和快速响应的传感器将在工业环境，实验室，健康中心和生物医学设备中找到应用。
With rising hazardous organic vapours in the environment, the detection of volatile organic vapour compounds (VOCs) is becoming important. To this end, this paper presents a conductive droplet-based disposable sensor. Unlike conventional sensors, the droplet system is easily replaceable and is capable of detecting multiple vapours based on surface tension gradient. The chemiresistive sensor presented here is fabricated on 2.5 mu m thick ultra-flexible graphene oxide-chitosan (GOC) with Pt electrodes having 60 mu m gap. The electrostatic interaction and strong hydrogen bonds between GO and polysaccharide groups in chitosan provide tunable hydrophobicity and stability to the droplet. With a conductive droplet of similar to 10 mu L of aq. NaCl as an active sensing material dispensed between the Pt electrodes, it was observed that the droplet showed 14-21% change in resistance in the presence of VOCs. A read-out circuit was also designed to get the data from the droplet sensor. The response time for the presented sensor (3-4 seconds) is significantly better than its solid-state sensor counterparts. With attractive features such as disposability, affordability and fast response the presented sensor will find applications in industrial environments, laboratories, health centres, and biomedical devices.