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Related Concept Videos

P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Transparent TiO2/MoO3 Heterojunction-Based Photovoltaic Self-Powered Triethylamine Gas Sensor with IoT-Enabled

Rahul Suresh Ghuge1, Sreelakshmi Madhavanunni Rekha2, Hajeesh Kumar Vikraman3

  • 1Laboratory of Sensors, Energy and Electronic Devices (Lab SEED), Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India.

ACS Sensors
|November 26, 2024
PubMed
Summary

A new self-powered gas sensor uses a TiO2/MoO3 heterojunction for efficient volatile organic compound (VOC) detection. This cost-effective, solution-processed sensor offers high sensitivity and selectivity for triethylamine (TEA) and integrates with smartphones for IoT applications.

Keywords:
TiO2/MoO3 heterojunctioncontact potential differencephotovoltaic self-powered gas sensorscanning Kelvin probetriethylamine sensor prototypework function

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Nanotechnology

Background:

  • Conventional gas sensors have high power demands, limiting their use in smartphones and IoT devices.
  • Self-powered gas sensors offer an energy-efficient alternative, with photovoltaic designs showing promise.
  • Existing photovoltaic sensors can be complex to fabricate and primarily detect oxidizing gases.

Purpose of the Study:

  • To develop a cost-efficient, solution-processed photovoltaic gas sensor for enhanced volatile organic compound (VOC) detection.
  • To address the limitations of complex fabrication and narrow detection scope in current self-powered gas sensors.
  • To demonstrate a novel TiO2/MoO3 heterojunction-based sensor with superior performance.

Main Methods:

  • Fabrication of a transparent, bilayer TiO2/MoO3 heterojunction using solution processing.
  • Utilized scanning Kelvin probe (SKP) measurements to analyze surface potential changes.
  • Operated the sensor in photovoltaic mode for gas detection and quantified sensitivity and limit of detection.

Main Results:

  • The TiO2/MoO3 sensor exhibited a significant contact potential difference change (-23 mV/kPa) in a triethylamine (TEA) atmosphere.
  • Achieved high sensitivity (∼2.35 × 10^-3 ppm^-1) and a low limit of detection (22 ppm) for TEA.
  • Demonstrated selective detection and quantification of TEA in binary VOC mixtures, with practical IoT integration.

Conclusions:

  • The developed TiO2/MoO3 photovoltaic sensor offers a cost-effective and efficient solution for VOC detection.
  • The sensor's high sensitivity and selectivity towards TEA are attributed to strong molecular affinity and electronic properties.
  • The successful integration with smartphone and IoT platforms highlights its potential for real-time environmental monitoring.