ZnO-Decorated In/Ga Oxide Nanotubes Derived from Bimetallic In/Ga MOFs for Fast Acetone Detection with High...

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• Acetone gas detection is crucial for air quality monitoring and medical diagnostics.
• Developing highly sensitive and selective acetone sensors remains a significant challenge.
• Metal-organic frameworks (MOFs) offer tunable properties for gas sensing applications.

Purpose of the Study:

• To design and fabricate an efficient acetone gas sensor using a core-shell nanotube heterostructure.
• To investigate the synergistic effects of In/Ga oxide (IGO) and ZnO nanoparticles for enhanced acetone detection.
• To evaluate the sensing performance, including sensitivity, selectivity, and response/recovery times.

Main Methods:

• Synthesis of bimetallic In/Ga MOF (MIL-68 (In/Ga)) as a precursor.
• Coupling with zinc ions to form In/Ga oxide (IGO)@ZnO core-shell nanotubes.
• Characterization of the heterostructure using electron microscopy and other techniques.
• Fabrication and testing of the IGO@ZnO gas sensor for acetone detection.

Main Results:

• The IGO@ZnO core-shell nanotubes exhibited a large specific surface area and abundant oxygen vacancies.
• The sensor demonstrated a low detection limit (200 ppb) and high response to acetone.
• Fast response (6.8 s) and recovery (6.1 s) times, along with good selectivity and stability, were achieved.
• A good linear relationship was observed between sensing responses and acetone concentrations.

Conclusions:

• The IGO@ZnO core-shell nanotube heterostructure provides an effective platform for highly sensitive acetone detection.
• The synergistic effect between IGO and ZnO nanoparticles significantly enhances gas sensing performance.
• The developed sensor shows great potential for practical applications in air quality monitoring and medical diagnosis.