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An Ultrasensitive Fluorescent Paper-Based CO2 Sensor.

Hui Wang1, Sergei I Vagin2, Bernhard Rieger2

  • 1Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada.

ACS Applied Materials & Interfaces
|April 23, 2020
PubMed
Summary
This summary is machine-generated.

A new paper-based sensor detects carbon dioxide (CO2) using a color-changing fluorescent material. This easy-to-make, reusable sensor offers stable performance for continuous CO2 monitoring.

Keywords:
CO2fluorescentgaspapersensor

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Analytical Chemistry

Background:

  • Accurate monitoring of carbon dioxide (CO2) levels is crucial for environmental and industrial applications.
  • Existing CO2 sensors can be expensive, complex, or lack long-term stability.
  • Development of low-cost, user-friendly, and reliable CO2 sensing technologies is needed.

Purpose of the Study:

  • To demonstrate a versatile and easily fabricated paper-based sensor for carbon dioxide (CO2) detection.
  • To develop a stable and repeatable CO2 sensing platform using a fluorescent color-shift chromophore.
  • To explore the potential of this paper-based sensor for low-cost, continuous CO2 monitoring applications.

Main Methods:

  • Infusing a specially designed fluorescent color-shift chromophore into standard filter paper.
  • Utilizing the color change of the fluorescent paper upon exposure to CO2, driven by carbonic acid formation.
  • Employing a ratiometric method to mitigate photobleaching and ensure sensor stability.

Main Results:

  • The paper-based sensor exhibited a color change upon exposure to CO2, indicating successful CO2 detection.
  • The ratiometric method effectively eliminated the effects of photobleaching, resulting in stable and repeatable sensor performance.
  • The sensor demonstrated a response time on the order of 1 minute and low detection limits.

Conclusions:

  • A versatile, easily fabricated, and reusable paper-based CO2 sensor has been successfully developed.
  • The sensor's stability, repeatability, and low detection limits suggest its potential for cost-effective CO2 monitoring.
  • This technology could be applied in smart buildings and other facilities requiring continuous CO2 level surveillance.