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Semiconductor Superlattice with Remarkable Raman Enhancement for Ultrafast Culture-Free Sensing of Multiple Pathogens
Peng Zhou1, Chong Zhao1, Yansha Song2
1Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Dongchuan Road 500, Shanghai 200241, China.
Journal of the American Chemical Society
|May 8, 2026
Summary
A novel gallium-doped zinc oxide superlattice enhances surface-enhanced Raman spectroscopy (SERS) for rapid pathogen detection. This semiconductor substrate achieves performance comparable to noble metals, enabling fast and accurate diagnostics.
Area of Science:
- Materials Science
- Spectroscopy
- Nanotechnology
Background:
- Traditional noble-metal SERS substrates face challenges with nonspecific adsorption and background interference in biological samples.
- Semiconductors offer potential for SERS due to weaker adsorption and charge transfer enhancement, but often suffer from low performance.
- Trace biological species identification requires ultrasensitive and selective analytical methods.
Purpose of the Study:
- To develop a novel semiconductor-based SERS substrate with high enhancement performance for trace analysis.
- To investigate the underlying mechanisms of Raman enhancement in semiconductor superlattices.
- To demonstrate the application of the developed SERS substrate for rapid pathogen detection.
Main Methods:
- Fabrication of a Ga-doped ZnO superlattice SERS substrate with high free carrier density.
- Characterization of the substrate's SERS performance and enhancement mechanisms.
- Integration of the substrate into an ultrafast, culture-free SERS platform for pathogen identification.
Main Results:
- The Ga-doped ZnO superlattice exhibited a record-high free carrier density (9.23 × 10^21 cm^-3) and SERS performance comparable to noble metals.
- Exceptional Raman enhancement was attributed to atomic-level interfaces, charge separation, hot electron transfer, and self-trapped states.
- The SERS platform achieved simultaneous identification of five VAP pathogens with a 1.0 CFU/mL detection limit and 100% accuracy in patient samples.
- Detection time was reduced to 10 minutes from 48-72 hours, with a low per-test cost of US$0.15.
Conclusions:
- Semiconductor superlattices can provide significant Raman enhancement, offering a new strategy for SERS applications.
- The developed Ga-doped ZnO SERS substrate enables rapid, accurate, and cost-effective multiplex screening of pathogens.
- This work paves the way for next-generation point-of-care diagnostic technologies.
