A flexible transparent graphene/metal–organic framework complex hybrid chemical sensor for highly sensitive ethanol detection

IF 10.7 Q1 CHEMISTRY, PHYSICAL

EcoMat Pub Date : 2024-01-02 DOI:10.1002/eom2.12433

Yong Hee Kim, Chang Ho Choi, Hyun Woo Song, Eun Kwang Lee, Dong-Pyo Kim, Joon Hak Oh

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Abstract

High-performance flexible and transparent chemical sensors are key to achieving wearable electronics. Graphene with high transmittance and electrical properties is a suitable material for flexible and transparent chemical sensors. However, graphene has low detectivity to chemical substances. Here, we report hybrid chemical sensors fabricated by introducing a highly flat and smooth metal–organic framework (MOF) on graphene. The graphene chemical sensors functionalized with MOF on SiO₂/Si wafer exhibit 22 times higher sensitivity of 6.07 μA ppm⁻¹ in detecting ethanol than that of pristine graphene transistors of 0.28 μA ppm⁻¹ and a low detection limit of 1 ppm. Furthermore, a flexible transparent 7 × 7 chemical sensor array exhibits great driving stability after the bending cycles of 10⁵ at a bending radius of 1.0 mm and shows sensitivity of 0.11 μA ppm⁻¹. Our findings demonstrate an efficient way to improve the chemical sensing ability of graphene for application in wearable chemical sensors.

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用于高灵敏度乙醇检测的柔性透明石墨烯/金属有机框架复合杂化传感器

高性能柔性透明化学传感器是实现可穿戴电子设备的关键。石墨烯具有高透光率和电气特性，是柔性透明化学传感器的合适材料。然而，石墨烯对化学物质的检测率较低。在此，我们报告了通过在石墨烯上引入高度平整光滑的金属有机框架（MOF）而制造的混合化学传感器。在二氧化硅/硅晶片上用 MOF 功能化的石墨烯化学传感器检测乙醇的灵敏度为 6.07 μA ppm-1，比原始石墨烯晶体管的 0.28 μA ppm-1 高出 22 倍，检测限低至 1 ppm。此外，柔性透明 7 × 7 化学传感器阵列在弯曲半径为 1.0 毫米、弯曲次数为 105 次后表现出极高的驱动稳定性，灵敏度为 0.11 μA ppm-1。我们的研究结果表明，提高石墨烯的化学传感能力是应用于可穿戴化学传感器的有效方法。

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来源期刊

EcoMat

CiteScore

17.30

自引率

0.00%

发文量

审稿时长

4 weeks