Fine-Tunable CO2 Colorimetric Sensors and CO2 Level Indicator Meter with Horizontal Linear Gauge via Inter-Chain Spacers,Advanced Materials Technologies

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Fine-Tunable CO2 Colorimetric Sensors and CO2 Level Indicator Meter with Horizontal Linear Gauge via Inter-Chain Spacers
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2024-03-10 , DOI: 10.1002/admt.202302147
Donghyun Kim ₁ , Ki‐Seob Hwang ₂ , Won‐Gun Koh ₃ , Jun‐Young Lee ₂

Affiliation

Fine-tuning the sensing properties of carbon dioxide (CO₂) colorimetric sensors is a challenging task. In this study, a short synthetic route is developed for CO₂-responsive nanoparticles with diverse sensitivity and detection range across a wide range of CO₂ concentrations. This involves the addition of oily liquids as inter-chain spacers, which changes the diffusivity of CO₂ gas into the sensing matrices without other chemical modifications. R values and the limit of detection (LOD) are estimated from Euclidean distance (ED) curves, indicating a ten-fold difference in sensitivity. Optical and physical analyses revealed that these results arise from intercalating inter-chain spacers between polymeric chains and modifying the gas diffusivity. Furthermore, the sensitivity and detection range can be easily tuned by mixing two CO₂-responsive nanoparticles having different inter-chain spacers, allowing the fabrication of the sensors with subtle differences in sensitivity and detection range. Based on these results, a CO₂ level meter with a horizontal linear gauge that allows visible identification of the level of CO₂ over the entire range of CO₂ concentrations (from 0% to 100%) is developed. Consequently, the findings will be helpful in achieving a better understanding of gas information and finding an effective way to control the characteristics of colorimetric sensors.

中文翻译：

可微调 CO2 比色传感器和 CO2 液位计，通过链间间隔器配备水平线性仪表

微调二氧化碳 (CO ₂ ) 比色传感器的传感特性是一项具有挑战性的任务。在这项研究中，开发了一条简短的合成路线，用于在各种CO _{2浓度范围内具有不同灵敏度和检测范围的CO}₂响应性纳米颗粒。这涉及添加油性液体作为链间间隔物，从而改变CO ₂气体进入传感基质的扩散率，而无需其他化学修饰。 R 值和检测限 (LOD) 是根据欧几里德距离 (ED) 曲线估算的，表明灵敏度有十倍的差异。光学和物理分析表明，这些结果是由于在聚合物链之间插入链间间隔基并改变气体扩散率而产生的。此外，通过混合具有不同链间间隔的两种CO ₂响应性纳米粒子，可以容易地调节灵敏度和检测范围，从而允许制造在灵敏度和检测范围上具有细微差别的传感器。基于这些结果，开发了一种带有水平线性仪表的CO ₂液位计，可以在整个CO _{2浓度范围（从0%到100%）内直观地识别CO}₂的水平。因此，这些发现将有助于更好地理解气体信息并找到控制比色传感器特性的有效方法。

更新日期：2024-03-10

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