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Structural Engineering Three-Dimensional Nano-Heterojunction Networks for High-Performance Photochemical Sensing.

Zain Ul Abideen1, Jun-Gyu Choi2, Jodie A Yuwono3

  • 1Nanotechnology Research Laboratory, Research School of Chemistry, College of Science, Australian National University, Canberra, Australian Capital Territory 2601, Australia.

ACS Applied Materials & Interfaces
|November 21, 2023
PubMed
Summary

Deep ultraviolet photoactivation enhances nanoscale heterojunction networks by tuning oxygen vacancies. This boosts photocatalytic activity for sensitive chemical detection in optoelectronic devices.

Keywords:
DFTXPSZnO-NiOdeep ultraviolet photoactivationnanoscale heterojunctionsoxygen vacancyroom temperature sensing

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photocatalysis

Background:

  • Nanoscale heterojunction networks show promise for optoelectronic and photocatalytic applications.
  • Surface defects in these networks hinder performance by causing charge trapping and recombination.

Purpose of the Study:

  • To engineer photocatalytic properties of nanoscale heterojunction networks using deep ultraviolet (DUV) photoactivation.
  • To investigate the role of oxygen vacancies in NiO-ZnO films for enhanced sensing capabilities.

Main Methods:

  • Fabrication of thick (∼10 μm) NiO-ZnO films.
  • In-depth X-ray photoelectron spectroscopy (XPS) analysis to characterize localized p-n nanoheterojunctions and oxygen vacancies (Vo).
  • Density functional theory (DFT) calculations to understand analyte adsorption mechanisms.

Main Results:

  • DUV photoactivation effectively tuned oxygen vacancies in NiO-ZnO nanoheterojunctions.
  • Optimized oxygen vacancy concentration resulted in a 30-fold increase in photochemoresistive response.
  • Detection of analytes at ppb levels was achieved at both 150 °C and room temperature.
  • DFT calculations indicated an 80% increase in analyte adsorption energy.

Conclusions:

  • DUV photoactivation is an effective strategy for controlling surface properties and enhancing photocatalytic activity in nanoscale heterojunction networks.
  • Engineered NiO-ZnO networks demonstrate significant potential for applications in chemical sensors, photodetectors, and photoelectrochemical cells.