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Related Concept Videos

Oxygen Delivering System I: Nasal Cannula and Face Mask01:26

Oxygen Delivering System I: Nasal Cannula and Face Mask

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The human body requires oxygen to function, and when the natural process of respiration is hindered, external devices, including the following, are needed to help deliver this vital gas.
Nasal Cannula
A nasal cannula is a lightweight tube split at one end into two prongs and placed in the nostrils. It is typically used to deliver low to medium levels of oxygen.
Suggested flow rate: The suggested flow rate for a nasal cannula typically ranges between 1 and 6 L/min.
Oxygen percentage setting:...
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Flexible Ni/NiOx-Based Sensor for Human Breath Detection.

Le Duc-Anh Ho1, Vu Binh Nam1, Daeho Lee1

  • 1Laser and Thermal Engineering Laboratory, Department of Mechanical Engineering, Gachon University, Seongnam 13120, Korea.

Materials (Basel, Switzerland)
|January 11, 2022
PubMed
Summary
This summary is machine-generated.

Researchers created a flexible breath sensor using nickel/nickel oxide (Ni/NiOx) and laser patterning. This novel sensor detects human breath efficiently at low temperatures with excellent stability and repeatability.

Keywords:
NiNiOxbreath sensorflexible sensorlaser digital patterninglaser-induced reductive sintering processnanoparticlesnickelnickel oxide

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sensor Technology

Background:

  • Development of advanced gas sensors for breath analysis is crucial for non-invasive diagnostics.
  • Existing sensors often require high operating temperatures or lack mechanical flexibility.
  • Nickel oxide (NiOx) based materials show promise for gas sensing applications.

Purpose of the Study:

  • To develop a simple, cost-effective method for fabricating a flexible Ni/NiOx-based breath sensor.
  • To evaluate the sensing performance, including response time, recovery time, and repeatability.
  • To assess the mechanical stability and understand the gas sensing mechanism.

Main Methods:

  • Fabrication of Ni/NiOx thin-film using solution-processed NiOx nanoparticle ink.
  • Single-step laser digital patterning for creating Ni electrodes and NiOx sensing channels on a polymer substrate.
  • Gas sensing measurements at low operating temperature (50 °C).
  • X-ray photoelectron spectroscopy (XPS) for mechanism investigation.
  • Cyclic bending tests for mechanical stability assessment.

Main Results:

  • Successful fabrication of a flexible Ni/NiOx breath sensor via laser-induced reductive sintering.
  • Efficient detection of human breath with fast response (1.4 s) and recovery (1.7 s) times.
  • Excellent repeatability and stable performance demonstrated over 10,000 bending cycles.
  • Decoupled analysis of temperature and chemical component effects on sensor response.

Conclusions:

  • The developed laser patterning method offers a facile route to flexible Ni/NiOx breath sensors.
  • The sensor exhibits high performance and superior mechanical robustness for practical applications.
  • This technology holds potential for non-invasive health monitoring through breath analysis.