Engineering Mesoporous Composite Nanospheres With Metal Core and Metal Oxide Shell for Plasmonic Promoted Gas Sensing
Tianming Hu1, Keyu Chen1, Xin-Yu Huang1
1Department of Chemistry, State Key Laboratory of Coatings for Advanced Equipment, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, iChEM, Fudan University, Shanghai, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|July 23, 2026
Summary
A new method creates uniform core-shell nanostructures for enhanced catalysis and sensing. These nanohybrids show improved sensitivity for gas detection, driven by light-induced hot-electron injection.
Area of Science:
- Materials Science
- Nanotechnology
- Chemistry
Background:
- Core-shell nanostructures with plasmonic cores and semiconducting metal oxide shells offer potential in catalysis, sensing, and optics.
- Synthetic challenges like precursor hydrolysis and high surface energy limit practical applications.
Purpose of the Study:
- To develop a versatile strategy for constructing uniform mesoporous semiconducting metal oxide (SMO) shells on nanocore seeds.
- To engineer Au@mSnO2 nanospheres for advanced photoresponsive catalysis and chemical sensing applications.
Main Methods:
- Sequential active colloidal interfacial assembly strategy for fabricating core-shell nanospheres.
- Fabrication of MEMS-based chemiresistive sensors using Au@mSnO2 nanospheres and micro-LEDs.
- Investigation of localized surface plasmon resonance (LSPR) induced charge carrier dynamics.
Main Results:
- Uniform Au@mSnO2 nanospheres with precisely coated mesoporous SMO shells were successfully synthesized.
- The fabricated sensors demonstrated a 6-fold increase in sensitivity for NO2 detection at room temperature under green light illumination.
- Ultrafast hot-electron injection was identified as the key mechanism enhancing catalytic activity and gas detection sensitivity.
Conclusions:
- The developed sequential assembly strategy provides a versatile platform for engineering multifunctional core-shell nanostructures.
- These nanohybrids show significant promise for intelligent sensing and nanophotocatalysis applications.
- The findings offer new avenues for designing advanced materials with tailored heterogeneous interfaces.
