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Wide range and highly linear signal processed systematic humidity sensor array using Methylene Blue and Graphene

Muhammad Umair Khan1, Gul Hassan1,2, Rayyan Ali Shaukat1

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A novel 3x3 humidity sensor array using graphene composite inks and inkjet printing achieves a highly linear response across all humidity ranges (0-100% RH). This advanced sensor system offers fast response and recovery times for diverse applications.

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Nanotechnology

Background:

  • Accurate humidity sensing is crucial for various applications.
  • Existing sensors often struggle with linearity across the full humidity range.
  • Graphene-based materials show promise for humidity sensing due to their unique properties.

Purpose of the Study:

  • To develop a systematic 3x3 humidity sensor array with a highly linear response across all humidity ranges (0-100% RH).
  • To investigate the effect of graphene particle size and interdigital electrode (IDE) spacing on sensor performance.
  • To utilize signal processing for achieving an all-range linear humidity response.

Main Methods:

  • Fabrication of a 3x3 sensor array using a commercial inkjet printer.
  • Utilization of Methylene Blue and Graphene composite inks with varying particle sizes (BGF, GF, GQD) as the active layer.
  • Spin coating the active layer onto IDEs with different interspaces (300, 200, 100 µm).
  • Application of a linear combination method with weights estimated by least squares for signal processing.

Main Results:

  • Achieved an all-range linear humidity response (0-100% RH) through signal processing of the nine-sensor array.
  • Demonstrated a fast response time (Tres) of 0.2 s and recovery time (Trec) of 0.4 s.
  • The combination of different graphene particle sizes and IDE interspaces contributed to the linear response.

Conclusions:

  • The proposed signal-processed humidity sensor array offers a highly linear and wide-range humidity detection capability.
  • This technology provides a new pathway for advanced humidity sensing applications.
  • The use of inkjet printing and graphene composites presents a scalable and effective approach for sensor fabrication.