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A high-performance moisture sensor based on ultralarge graphene oxide.

Boon-Hong Wee1, Wai-Hwa Khoh1, Ashis K Sarker2

  • 1Department of Chemistry, Research Institute of Natural Sciences, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon, 406-772, Republic of Korea. hong5506@inu.ac.kr.

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Ultralarge graphene oxide (UGO) sheets significantly enhance humidity sensor performance compared to small-sized graphene oxide (SGO). UGO-based sensors show higher sensitivity, faster response times, and potential for touchless interface applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Graphene oxide (GO) is a promising material for humidity sensing.
  • The lateral size of GO sheets can influence sensor performance.
  • Understanding GO size effects is crucial for optimizing humidity sensor design.

Purpose of the Study:

  • To investigate the impact of graphene oxide (GO) lateral size on humidity sensing properties.
  • To compare the performance of sensors fabricated with ultralarge graphene oxide (UGO) and small-sized graphene oxide (SGO).
  • To evaluate the potential of UGO-based sensors for advanced applications.

Main Methods:

  • Fabrication of humidity sensors using gold electrodes coated with UGO (47.4 ± 22.2 μm) and SGO (0.8 ± 0.5 μm).
  • Measurement of in-plane conductance changes with relative humidity (RH) from 7% to 100%.
  • Analysis of sensor sensitivity, response/recovery times, and stability.
  • Evaluation of proton conductivity via activation enthalpy (Ea).

Main Results:

  • UGO sensors exhibited a four-order-of-magnitude increase in conductance, compared to three orders for SGO sensors.
  • Maximal sensitivity was higher for UGO (4339 ± 433) than SGO (1982 ± 122).
  • UGO sensors demonstrated ultrafast response/recovery times (0.2/0.7 s) and excellent stability (±4.6% variation over five days).
  • Lower activation enthalpy for UGO (0.63 eV) vs. SGO (1.14 eV) indicated improved proton conductivity.

Conclusions:

  • The lateral size of graphene oxide significantly impacts humidity sensing performance.
  • Ultralarge graphene oxide sheets offer superior sensitivity and response times for humidity sensors.
  • UGO-based sensors show potential for touchless interface applications, including fingertip moisture detection.