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Updated: Mar 17, 2026
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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
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Geometry-Engineered Pd-Au Plasmonic Nanoarrays: Unveiling Design Principles for High-Performance Hydrogen Sensing
Weiyi Li1, Guoqun Li1, Yunfang Xiao1
1Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, China.
The Journal of Physical Chemistry Letters
|March 16, 2026
Summary
Researchers developed a new method for creating palladium-gold (Pd-Au) nanostructures for highly sensitive and rapid hydrogen sensors. This breakthrough enables precise control over nanostructure design for improved hydrogen detection performance.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Plasmonic sensors using palladium-gold (Pd-Au) nanostructures offer label-free hydrogen detection.
- Rational design of these sensors is limited by poor control over nanoscale structural parameters and their impact on performance.
Purpose of the Study:
- To develop a fabrication strategy for highly ordered Pd-Au nanoarrays with tunable structural parameters.
- To establish the structure-property relationships governing hydrogen sensing performance.
Main Methods:
- Template-assisted evaporation strategy to create Pd-Au nanoarrays.
- Independent tuning of stacking sequence, lateral size, and out-of-plane geometry.
- Correlation of experimental data with an extended Gans model for mechanistic elucidation.
Main Results:
- Stacking order critically influences the balance between sensing sensitivity and response kinetics.
- Out-of-plane geometry dictates depolarization factors and refractive index sensitivity.
- Optimized Pd/Au nanoarrays demonstrated a significant localized surface plasmon resonance (LSPR) shift of 81 nm at 4 vol % H2 and 14 nm at 0.5 vol % H2.
Conclusions:
- Fundamental design principles for high-performance plasmonic hydrogen sensors were established.
- The developed fabrication method and mechanistic insights enable rational design of advanced hydrogen detection platforms.
