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Manufacturing of a Nafion-coated, Reduced Graphene Oxide/Polyaniline Chemiresistive Sensor to Monitor pH in Real-time During Microbial Fermentation
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High-sensitivity NH3 gas sensor using pristine graphene doped with CuO nanoparticles.

Oleksandr Tsymbalenko1,2, Soyoung Lee1, Yong-Min Lee1

  • 1Climate and Environmental Research Institute, Korea Institute of Science and Technology, Hwarang-ro 14 gil 5, Seongbuk-gu, 02792, Seoul, Republic of Korea.

Mikrochimica Acta
|March 15, 2023
PubMed
Summary

A novel ammonia (NH3) gas sensor utilizing graphene doped with copper(II) oxide (CuO) nanoparticles demonstrates high sensitivity and selectivity. This development offers a promising solution for real-time ammonia monitoring applications.

Keywords:
Chemiresistive sensorCuO–doped graphene sensorGraphene NH3 gas sensorGraphene dopingPristine graphene

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Development of highly sensitive and selective gas sensors is crucial for environmental monitoring and industrial safety.
  • Graphene's unique electronic properties make it a promising material for gas sensing applications.
  • Doping graphene with metal oxides can enhance its gas sensing performance.

Purpose of the Study:

  • To develop a highly sensitive and selective ammonia (NH3) gas sensor.
  • To investigate the effect of copper(II) oxide (CuO) nanoparticle doping on graphene's NH3 sensing capabilities.
  • To evaluate the sensor's performance characteristics, including response, recovery, selectivity, and reusability.

Main Methods:

  • High-quality single-layer graphene was synthesized using chemical vapor deposition.
  • Approximately 15 nm-sized CuO nanoparticles were fabricated via a microwave-assisted thermal method.
  • Pristine graphene was doped with an aqueous suspension of CuO nanoparticles using a spin-coating technique.

Main Results:

  • The CuO-doped graphene sensor exhibited a significant resistivity change (approx. 83%) upon exposure to NH3 gas.
  • The sensor demonstrated high selectivity for NH3 detection at room temperature (25 °C) and 55% relative humidity.
  • Excellent performance metrics were achieved, including a fast response time (approx. 19 s), rapid recovery (approx. 277 s), a low detection limit (0.041 ppm), and good reusability.

Conclusions:

  • Single-layer graphene doped with specific-sized CuO nanoparticles is a highly effective material for developing sensitive and selective NH3 gas sensors.
  • The p-type doping mechanism significantly enhances graphene's electrical response to NH3.
  • This sensor technology holds potential for real-time, reliable ammonia monitoring.