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Fluorographene based Ultrasensitive Ammonia Sensor.

Kiran Kumar Tadi1, Shubhadeep Pal1, Tharangattu N Narayanan1

  • 1TIFR-Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Hyderabad - 500075, India.

Scientific Reports
|May 5, 2016
PubMed
Summary
This summary is machine-generated.

Fluorographene sensors achieve ultra-low level detection of ammonia and ammonium. This breakthrough in selective gas sensing offers potential for advanced point-of-care and clinical diagnostic devices.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Graphene's properties can be tuned with dopants for single molecule detection.
  • Fluorine doping in graphene creates fluorographene (FG) with unique electrostatic interactions.

Purpose of the Study:

  • To develop a selective and highly sensitive sensor for ammonia/ammonium detection.
  • To investigate the use of fluorographene for ultra-low level gas sensing applications.

Main Methods:

  • Fabrication of screen-printed fluorographene sensors with varying fluorine content (~5% and ~24%).
  • Utilizing impedance changes to detect ammonia and ammonium ions.
  • Employing density functional theory (DFT) calculations to analyze interaction energies between FG and ammonia/ammonium.

Main Results:

  • Achieved a very low limit of detection of ~0.44 pM for ammonia/ammonium.
  • Demonstrated sensor linearity over a wide concentration range (1 pM–0.1 μM).
  • Confirmed sensor functionality for both ionized (ammonium) and un-ionized ammonia.

Conclusions:

  • Fluorographene-based impedance sensors offer selective, high-sensitivity, and ultra-low level detection of ammonia.
  • The developed sensor platform is fast-responding, patternable, and suitable for large-area applications.
  • This technology holds promise for the development of novel point-of-care and clinical diagnostic devices.