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Efficient room temperature hydrogen sensor based on UV-activated ZnO nano-network.

Mohit Kumar1, Rahul Kumar1, Saravanan Rajamani1

  • 1Department of Electrical Engineering, Indian Institute of Technology Jodhpur, Jodhpur-342011, India.

Nanotechnology
|July 1, 2017
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Summary

Novel hydrogen sensors utilizing gold-embedded zinc oxide (ZnO) nano-networks demonstrate enhanced room temperature performance with ultraviolet (UV) light. This advancement offers energy-efficient, low-cost hydrogen detection solutions.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Hydrogen sensors are crucial for safety and energy applications.
  • Developing room-temperature sensors with high sensitivity remains a challenge.
  • Zinc oxide (ZnO) nanostructures offer promising properties for gas sensing.

Purpose of the Study:

  • To fabricate and characterize room-temperature hydrogen sensors based on gold (Au)-embedded ZnO nano-networks.
  • To investigate the effect of ultraviolet (UV) illumination on sensor performance.
  • To explore the potential for energy-efficient hydrogen sensing.

Main Methods:

  • Fabrication of Au-decorated ZnO nano-networks on SiO2/Si substrates via chemical vapor deposition.
  • Characterization using X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM).
  • Sensor performance evaluation with interdigitated electrodes (IDEs) under varying hydrogen concentrations and UV illumination.

Main Results:

  • ZnO nano-networks with uniformly distributed Au nanoparticles were successfully synthesized.
  • The sensor exhibited a significant response (~21.5%) under UV illumination at room temperature for 5 ppm hydrogen.
  • UV illumination enhanced sensor response by promoting ion adsorption and electron transitions.

Conclusions:

  • UV-photoactivated Au-embedded ZnO nano-networks provide an effective platform for room-temperature hydrogen sensing.
  • The combination of GaN UV LEDs and ZnO nanostructures enables energy-efficient, low-cost sensor design.
  • This approach offers a promising route for developing advanced hydrogen detection systems.