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Semiconducting SnO2 nanoparticles for surface-enhanced Raman scattering applications.

P Surya Lakshmi1, B Mohanarao1, P Babuji1

  • 1Department of Physics, School of Sciences, GITAM Deemed to be University Visakhapatnam 530045 India svadaval@gitam.edu saivadavalli@gmail.com.

RSC Advances
|April 27, 2026
PubMed
Summary
This summary is machine-generated.

Tin oxide (SnO2) nanoparticles synthesized via sol-gel and annealing show promise for surface-enhanced Raman scattering (SERS). Optimized defect engineering in SnO2 enhances charge transfer for sensitive, metal-free SERS applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Spectroscopy

Background:

  • Surface-enhanced Raman scattering (SERS) typically relies on noble metal nanostructures.
  • Developing cost-effective, non-plasmonic alternatives is crucial for broader SERS applications.
  • Semiconductor nanostructures offer potential for SERS through charge transfer mechanisms.

Purpose of the Study:

  • To synthesize and optimize tin oxide (SnO2) nanoparticles for non-plasmonic SERS.
  • To investigate the role of thermal annealing and oxygen vacancies in SERS performance.
  • To demonstrate the potential of defect-engineered SnO2 as a SERS substrate.

Main Methods:

  • Sol-gel synthesis of SnO2 nanoparticles followed by thermal annealing at 800 °C and 900 °C.
  • Characterization using X-ray diffraction (XRD), Rietveld refinement, high-resolution electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS).
  • SERS measurements using Nile blue as an analyte to evaluate substrate performance.

Main Results:

  • Phase-pure SnO2 nanoparticles with enhanced crystallinity and spherical morphology were obtained.
  • Annealing at 800 °C optimized oxygen vacancies, crucial for charge transfer enhancement.
  • SERS measurements showed a significant enhancement factor (3.95 × 10^3) and a low detection limit (10^-6 mol L^-1).
  • The SnO2 substrate demonstrated high reproducibility and minimal fluorescence.

Conclusions:

  • Thermally optimized SnO2 nanoparticles serve as an effective non-plasmonic SERS substrate.
  • Defect engineering via thermal treatment is a viable strategy for enhancing semiconductor SERS.
  • This metal-free SnO2 platform offers a scalable and cost-effective solution for chemical and biosensing.