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Exclusive and ultrasensitive detection of formaldehyde at room temperature using a flexible and monolithic chemiresistive sensor

Author

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  • Yong Kun Jo

    (Korea University)

  • Seong-Yong Jeong

    (Korea University)

  • Young Kook Moon

    (Korea University)

  • Young-Moo Jo

    (Korea University)

  • Ji-Wook Yoon

    (Jeonbuk National University)

  • Jong-Heun Lee

    (Korea University)

Abstract

Formaldehyde, a probable carcinogen, is a ubiquitous indoor pollutant, but its highly selective detection has been a long-standing challenge. Herein, a chemiresistive sensor that can detect ppb-level formaldehyde in an exclusive manner at room temperature is designed. The TiO2 sensor exhibits under UV illumination highly selective detection of formaldehyde and ethanol with negligible cross-responses to other indoor pollutants. The coating of a mixed matrix membrane (MMM) composed of zeolitic imidazole framework (ZIF-7) nanoparticles and polymers on TiO2 sensing films removed ethanol interference completely by molecular sieving, enabling an ultrahigh selectivity (response ratio > 50) and response (resistance ratio > 1,100) to 5 ppm formaldehyde at room temperature. Furthermore, a monolithic and flexible sensor is fabricated successfully using a TiO2 film sandwiched between a flexible polyethylene terephthalate substrate and MMM overlayer. Our work provides a strategy to achieve exclusive selectivity and high response to formaldehyde, demonstrating the promising potential of flexible gas sensors for indoor air monitoring.

Suggested Citation

  • Yong Kun Jo & Seong-Yong Jeong & Young Kook Moon & Young-Moo Jo & Ji-Wook Yoon & Jong-Heun Lee, 2021. "Exclusive and ultrasensitive detection of formaldehyde at room temperature using a flexible and monolithic chemiresistive sensor," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-25290-3
    DOI: 10.1038/s41467-021-25290-3
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    Cited by:

    1. Jie Zhang & Linshan Liu & Chaofeng Zheng & Wang Li & Chunru Wang & Taishan Wang, 2023. "Embedded nano spin sensor for in situ probing of gas adsorption inside porous organic frameworks," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Meizhen Gao & Rui-Kang Huang & Bin Zheng & Pengfei Wang & Qi Shi & Wei-Xiong Zhang & Jinxiang Dong, 2022. "Large breathing effect in ZIF-65(Zn) with expansion and contraction of the SOD cage," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
    3. Jiayu Li & Wenzhe Si & Lei Shi & Ruiqin Gao & Qiuju Li & Wei An & Zicheng Zhao & Lu Zhang & Ni Bai & Xiaoxin Zou & Guo-Dong Li, 2024. "Essential role of lattice oxygen in hydrogen sensing reaction," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    4. Hong Zhang & Zuobin Zhang & Zhou Li & Hongjie Han & Weiguo Song & Jianxin Yi, 2023. "A chemiresistive-potentiometric multivariate sensor for discriminative gas detection," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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