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High-Performance Humidity Sensor Based on the Graphene Flower/Zinc Oxide Composite.

Muhammad Saqib1, Shenawar Ali Khan1, Hafiz Mohammad Mutee Ur Rehman1

  • 1Faculty of Applied Energy System, Major of Electronic Engineering, Jeju National University, Jeju 63243, Korea.

Nanomaterials (Basel, Switzerland)
|January 22, 2021
PubMed
Summary

A novel graphene flower/zinc oxide composite enhances humidity sensor performance. This material shows high sensitivity, stability, and fast response, making it ideal for health monitoring applications.

Keywords:
fast response/recovery timefunctional materialgraphene flower and ZnO compositehealth monitoring applicationssol–gel methodultra-sensitive humidity sensor

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Electronic device performance depends on functional materials.
  • Composite materials offer a cost-effective route to improved material properties.
  • Graphene and zinc oxide are promising materials for electronic applications.

Purpose of the Study:

  • To synthesize and characterize a novel graphene flower/zinc oxide (GrF/ZnO) composite.
  • To develop a humidity sensor utilizing the GrF/ZnO composite as the functional layer.
  • To evaluate the performance of the GrF/ZnO composite-based humidity sensor.

Main Methods:

  • Sol-gel synthesis method for GrF/ZnO composite preparation.
  • Field Emission Scanning Electron Microscopy (FESEM), Energy-Dispersive Spectroscopy (EDS), and X-ray Diffraction (XRD) for material characterization.
  • Testing the humidity sensor performance across a relative humidity (RH) range of 15% to 86%.

Main Results:

  • Successful synthesis of the GrF/ZnO composite with unique morphology and structure.
  • The humidity sensor demonstrated high sensitivity with an average current change of 7.77 μA/RH%.
  • The sensor exhibited excellent stability, repeatability, fast response, and quick recovery times.

Conclusions:

  • The GrF/ZnO composite is a highly effective functional material for humidity sensing.
  • The developed humidity sensor shows great potential for health monitoring due to its sensitivity to human breathing.
  • This work highlights the utility of composite materials in advancing sensor technology.