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Graphene-based CO2 sensing and its cross-sensitivity with humidity

机译：石墨烯基CO 2 传感及其与湿度的交叉敏感性

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We present graphene-based CO2 sensing and analyze its cross-sensitivity with humidity. In order to assess the selectivity of graphene-based gas sensing to various gases, measurements are performed in argon (Ar), nitrogen (N2), oxygen (O2), carbon dioxide (CO2), and air by selectively venting the desired gas from compressed gas bottles into an evacuated vacuum chamber. The sensors provide a direct electrical readout in response to changes in high concentrations, from these bottles, of CO2, O2, nitrogen and argon, as well as changes in humidity from venting atmospheric air. From the signal response to each gas species, the relative graphene sensitivity to each gas is extracted as a relationship between the percentage-change in graphene's resistance response to changes in vacuum chamber pressure. Although there is virtually no response from O2, N2 and Ar, there is a sizeable cross-sensitivity between CO2 and humidity occurring at high CO2 concentrations. However, under atmospheric concentrations of CO2, this cross-sensitivity effect is negligible – allowing for the use of graphene-based humidity sensing in atmospheric environments. Finally, charge density difference calculations, computed using density functional theory (DFT) are presented in order to illustrate the bonding of CO2 and water molecules on graphene and the alterations of the graphene electronic structure due to the interactions with the substrate and the molecules.
机译：我们提出了基于石墨烯的CO 2 传感技术，并分析了其与湿度的交叉敏感性。为了评估基于石墨烯的气体对各种气体的选择性，在氩气（Ar），氮气（N 2 ），氧气（O 2 ），二氧化碳（CO 2 ）和空气，方法是将压缩气体瓶中的所需气体选择性地排放到抽真空室。传感器根据这些瓶中CO 2 ，O 2 < / small>，氮气和氩气，以及由于排出大气而引起的湿度变化。从对每种气体种类的信号响应中，提取出对每种气体的相对石墨烯敏感性，作为石墨烯电阻响应对真空室压力变化的百分比变化之间的关系。尽管O 2 ，N 2 和Ar几乎没有响应，但交叉灵敏度相当大CO 2 和高CO 2 浓度下的湿度之间的关系。但是，在大气浓度为CO 2 的情况下，这种交叉敏感效应可以忽略不计–允许在大气环境中使用基于石墨烯的湿度感应。最后，介绍了使用密度泛函理论（DFT）计算的电荷密度差计算，以说明CO 2 和水分子在石墨烯上的键合以及碳原子的变化。石墨烯的电子结构归因于与底物和分子的相互作用。

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