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In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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Printed oxygen gas sensor using copper-DTDTPA solid electrolyte.

Nivedita Priyadarshni1, Soumen Mandal, Supradeepa Panual Ganesan

  • 1Material Processing and Microsystems Laboratory, CSIR-Central Mechanical Engineering Research Institute, Durgapur, WB 713209, India. somandal88@cmeri.res.in n_chanda@cmeri.res.in.

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|February 16, 2021
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We developed a rapid, cost-effective printed oxygen sensor using a novel solid electrolyte (Cu-DTDTPA) on filter paper. This sensor shows high sensitivity and stability, making it ideal for medical ventilators, especially during the COVID-19 pandemic.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sensor Technology

Background:

  • Development of accurate and affordable oxygen sensors is crucial for medical applications.
  • Existing sensors often face limitations in cost, response time, or operating conditions.
  • The COVID-19 pandemic highlighted the need for reliable monitoring of oxygen levels.

Purpose of the Study:

  • To present a novel method for fabricating low-cost, ambient-temperature potentiometric oxygen sensors.
  • To characterize the performance and stability of the developed sensor for potential medical use.

Main Methods:

  • Utilized copper-dithiolated diethylene triamine pentaacetic acid complex molecules (Cu-DTDTPA) adsorbed on filter paper as a solid electrolyte.
  • Employed 3-D printing with silver/silver chloride ink for interdigitated electrodes.
  • Investigated sensor response to varying oxygen concentrations, temperature, humidity, and ageing.

Main Results:

  • Confirmed filter paper adsorbed Cu-DTDTPA functions as a solid electrolyte.
  • Achieved a maximum sensitivity of 0.052 mV/%O2 and a response time of 1.15 s/%O2.
  • Demonstrated a wide measurement range (14.55 mV to 17.25 mV for 20%-90% O2), low standard deviation (0.12 mV), and stable performance across environmental variations.

Conclusions:

  • The developed printed potentiometric oxygen sensor exhibits high performance and stability.
  • Its rapid, cost-effective fabrication and suitability for ambient temperature operation make it promising for medical ventilator applications.
  • The sensor's characteristics are particularly relevant for monitoring oxygen during critical situations like the COVID-19 pandemic.