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Influence of SAM Quality on the Organic Semiconductor Thin Film Gas Sensors

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Chemical Research in Chinese Universities Aims and scope

Abstract

Gas sensors based on organic semiconductors receive tremendous attentions owing to their advantages on high selectivity and room temperature operation. However, until now, most organic semiconductor based sensors still suffered from problems, such as low sensitivity, slow response/recovery speed and poor stability. In addition, a clear correlation between the sensing performance and the film property is still absent. Herein, we report the investigation on sensing performance of a series of organic films with various morphologies. By simply adjusting the quality of self-assembled monolayer(SAM) on the silicon wafer surface, we obtain organic semiconductor 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) films with varied morphologies and different charge transport abilities. The film with a small grain size and a continuous morphology presents the highest sensing performance to NO2, with a sensitivity up to 730%/ppm(ppm=parts per million, volume ratio). We thus reveal that the high sensitivity of the organic film is evident related with the charge transport ability and initial conductivity of the films, as well as the morphologies of both modification layer and the active films.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China(No.2018YFE0200700), the National Natural Science Foundation of China(Nos.51773143, 51821002), and the Fund of the German-Chinese Transregional Collaborative Research Centre TRR 61(No.21661132006).

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Authors and Affiliations

  1. Institute of Functional Nano & Soft Materials(FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials & Devices, Soochow University, Suzhou, 215123, P. R. China

    Lunan Zhu, Zi Wang, Jie Lu, Xu Zhou, Lizhen Huang & Lifeng Chi

  2. Research and Development Center for Genetics Resource, Chinese Academy of Sciences, Changzhou, 213000, P. R. China

    Zhoufang Zeng

Authors
  1. Lunan Zhu
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  2. Zi Wang
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  3. Jie Lu
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  4. Xu Zhou
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  5. Zhoufang Zeng
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  6. Lizhen Huang
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  7. Lifeng Chi
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Corresponding authors

Correspondence to Lizhen Huang or Lifeng Chi.

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Zhu, L., Wang, Z., Lu, J. et al. Influence of SAM Quality on the Organic Semiconductor Thin Film Gas Sensors. Chem. Res. Chin. Univ. 38, 510–515 (2022). https://doi.org/10.1007/s40242-021-1167-6

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  • DOI: https://doi.org/10.1007/s40242-021-1167-6

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