一种超灵敏的 NH3 气体传感器，由离子共轭聚克罗卡因/Ti3C2TX 核壳复合材料实现,Nanoscale Horizons

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一种超灵敏的 NH3 气体传感器，由离子共轭聚克罗卡因/Ti3C2TX 核壳复合材料实现
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2023-03-14 , DOI: 10.1039/d2nh00591c
Jin Zhou ₁ , Seyed Hossein Hosseini Shokouh ₁ , Linfan Cui ₂ , Topias Järvinen ₁ , Olli Pitkänen ₁ , Zhong-Peng Lv ₃ , Krisztian Kordas ₁

Affiliation

MXenes 是新兴的传感材料，因为它们具有金属导电性和丰富的分析物表面化学性质；然而，它们的稳定性较差。与功能性聚合物的结合可以在很大程度上防止性能下降并提高传感性能。在此，我们展示了一种核壳复合材料，Ti ₃ C ₂ T _x @croconaine（聚（1,5-二氨基萘-克罗卡因），PDAC）通过简单的原位聚合反应制备，适用于 NH ₃检测。与原始 Ti ₃ C ₂ T _x_{相比，由 Ti 3} C ₂ T _x制成的传感器^{–polycroconaine 复合物表现出 2.8% ppm -1}的显着增强的灵敏度和 50 ppb 的估计可实现检测限。改进的传感性能可归因于 PDAC 的存在促进了 NH _{3的吸附并改变了 Ti}₃ C ₂ T _x域之间的隧穿电导率。密度泛函理论 (DFT) 计算表明，NH _{3的吸附能}on PDAC 是测试气体中最高的，支持传感器对该分析物的选择性。得益于PDAC外壳赋予的保护，该复合材料的可靠运行期至少为40天。此外，我们展示了一种基于 Ti ₃ C ₂ T _x @PDAC 复合材料的柔性纸基传感器，其性能不会因机械变形而衰减。这项工作提出了一种新的机制和可行的方法来合成 MXene-聚合物复合材料，提高了化学传感的灵敏度和稳定性。

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An ultra-sensitive NH3 gas sensor enabled by an ion-in-conjugated polycroconaine/Ti3C2Tx core–shell composite

MXenes are emerging sensing materials due to their metallic conductivity and rich surface chemistry for analytes; they, however, suffer from poor stability. Incorporation with functional polymers can largely prevent the performance decay and enhance the sensing performance. Herein, we demonstrate a core–shell composite, Ti₃C₂T_x@croconaine (poly(1,5-diaminonaphthalene-croconaine), PDAC) prepared by a facile in situ polymerization reaction, suitable for NH₃ detection. Compared to pristine Ti₃C₂T_x, the sensor made of a Ti₃C₂T_x–polycroconaine composite exhibits a significantly enhanced sensitivity of 2.8% ppm⁻¹ and an estimated achievable limit of detection of 50 ppb. The improved sensing performance could be attributed to the presence of PDAC facilitating the adsorption of NH₃ and changing the tunneling conductivity between Ti₃C₂T_x domains. Density functional theory (DFT) calculations reveal that the adsorption energy of NH₃ on PDAC is the highest among the tested gases, which supports the selectivity of the sensor to this analyte. Benefiting from the protection conferred by the PDAC shell, the composite has a reliable operation period of at least 40 days. In addition, we demonstrated a flexible paper-based sensor of the Ti₃C₂T_x@PDAC composite, without attenuated performance upon mechanical deformation. This work proposed a novel mechanism and a feasible methodology to synthesize MXene–polymer composites with improved sensitivity and stability for chemical sensing.

更新日期：2023-03-14

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