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Intimate Humidity Monitoring: Development and Performance Evaluation of Wearable Color-Electric Dual-Mode Humidity Sensor

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Abstract

Flexible wearable humidity sensors have seen significant development in healthcare fields. However, most sensors have only one electrical response mode with low visualization, thus limiting applications. Here, a wearable color-electric dual-mode linked-response humidity sensor was provided for intimate humidity monitoring. Specifically, nickel (II) iodide (NiI2) and polyacrylonitrile (PAN) were chemically treated and sodium hydroxide (NaOH)-modified, respectively. Subsequently, the modified NiI2 and PAN were configured into a spinning solution to fabricate humidity-sensitive NiI2/PAN membranes utilizing the solution blow-spinning method. Polyimide-based fork-finger electrodes were then laminated onto the humidity-sensitive NiI2/PAN membrane to assemble a wearable color-electric bimodal NiI2/PAN humidity sensor. The sensor was characterized by a fast response time (6.19 s) and recovery time (9.58 s), wide humidity-monitoring range (11–98% RH), relatively small hysteresis (1.9% RH), and excellent stability (> 30 d). As the relative humidity (RH) increased from 11 to 98%, the color of the Ni2/PAN membrane changed drastically from black to light yellow, demonstrating significant potential in enhancing the visualization of humidity sensors and optimizing their monitoring effects.

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Funding

This research was supported by the Hainan Provincial Natural Science Foundation of China (Grant no.223MS054).

Author information

Authors and Affiliations

  1. Fiber Materials Research Center, School of Textiles and Fashion, Shanghai University of Engineering Science, Shanghai, China

    Hui Zhu, Guangwu Sun, Hongyan Hu & Changfa Xiao

  2. Mechanical and Electrical Engineering College, Hainan Vocational University of Science and Technology, Haikou, Hainan Province, China

    Huimin Han & Guangwu Sun

  3. School of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai, China

    Hua Zhang

  4. State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin, China

    Changfa Xiao

Authors
  1. Hui Zhu
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  2. Huimin Han
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The manuscript was collaboratively written with contributions from all the authors, who also provided feedback on previous versions of the manuscript. All the authors have thoroughly read and approved the final version of the manuscript.

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Correspondence to Guangwu Sun.

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Zhu, H., Han, H., Sun, G. et al. Intimate Humidity Monitoring: Development and Performance Evaluation of Wearable Color-Electric Dual-Mode Humidity Sensor. Fibers Polym 25, 673–682 (2024). https://doi.org/10.1007/s12221-023-00444-w

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