4.7 Article

Daily writing carbon ink: Novel application on humidity sensor with wide detection range, low detection limit and high detection resolution

期刊

SENSORS AND ACTUATORS B-CHEMICAL
卷 339, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.129884

关键词

Carbon ink; Humidity sensor; Wide detection range; Low detection limit; High detection resolution

资金

  1. National Science Funds for Excellent Young Scholars of China [61822106]
  2. Natural Science Foundation of China [U19A2070]
  3. National Science Funds for Creative Research Groups of China [61421002]

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By analyzing the physical and chemical properties of daily writing carbon ink, researchers were able to fabricate a high-performance humidity sensor. This sensor showed positive humidity sensitive characteristics, wide detection range, low detection limit, and high detection resolution, making it a promising option for further research in this field.
For a long time, the application of the daily writing carbon ink is mainly reflected on writing and painting, and rarely used in electronic field. Herein, we analyzed the physical and chemical properties of the daily writing carbon ink. Characterization results show that the daily writing carbon ink is mainly composed of carbon nanoparticles, and has good hydrophilicity and very stable dispersion. Further, the humidity sensor was fabricated using daily writing carbon ink and its humidity sensing performances were investigated at room temperature (20 ?C). The testing results show that the resistance of the humidity sensor increases with the increase of relative humidity (RH), showing a positive humidity sensitive characteristic. Compared with most of the reported humidity sensors, the carbon ink humidity sensor has better humidity sensing performances on wide detection range (2 - 95 % RH), low detection limit (2% RH) and high detection resolution (1% RH). Finally, the positive humidity sensitive characteristic of the humidity sensor is analyzed using electron tunneling effect (blocking of water molecular membrane). This work not only demonstrates a facile and low-cost way to realize high performance humidity sensor, but also provides a pathway for the research of humidity sensor with positive response characteristic.

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