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Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
Published on: March 20, 2015
Surface-enhanced Raman scattering for arsenate detection on multilayer silver nanofilms
Mei-Juan Han1, Jumin Hao, Zhonghou Xu
1Center for Environmental Systems, Stevens Institute of Technology, Hoboken, NJ 07030, United States.
Analytica Chimica Acta
|April 20, 2011
Summary
Surface-enhanced Raman scattering (SERS) offers a sensitive method for detecting arsenate (As(V)). This study developed a silver nanofilm substrate for SERS analysis, achieving a low detection limit for arsenate in water samples.
Area of Science:
- Analytical Chemistry
- Materials Science
- Environmental Science
Background:
- Surface-enhanced Raman scattering (SERS) is a powerful technique for trace chemical detection.
- Arsenate (As(V)) contamination in water poses significant health risks, necessitating reliable detection methods.
- Existing SERS substrates require further optimization for sensitivity and selectivity in complex matrices.
Purpose of the Study:
- To develop and validate a SERS-based method for the quantitative analysis of arsenate (As(V)).
- To investigate the performance of multilayer silver nanofilms on glass slides (Ag/GL substrates) as SERS-active platforms.
- To evaluate the influence of background electrolytes on SERS sensitivity and selectivity for As(V).
Main Methods:
- Fabrication of multilayer Ag nanofilms on glass slides via electroless deposition.
- SERS measurements of arsenate solutions with varying concentrations and background electrolytes.
- Analysis of SERS spectra to determine limit of detection (LOD), calibration curves, and selectivity.
- Assessment of substrate reproducibility using relative standard deviation (RSD).
Main Results:
- Achieved an As(V) limit of detection (LOD) of approximately 5 μg L⁻¹ or lower.
- Observed a >2-fold enhancement in SERS sensitivity towards As(V) in the presence of background electrolytes.
- Established excellent linear relationships between SERS peak heights and As(V) concentrations (0-250 μg L⁻¹).
- Demonstrated high selectivity for As(V) over other oxyanions (phosphate, nitrate, sulfate).
- Reported a low sample-to-sample RSD of 5.2%, indicating substrate uniformity and reproducibility.
Conclusions:
- The developed Ag/GL SERS substrate is effective for the sensitive and selective quantification of arsenate.
- The SERS method shows promise for analyzing As(V) in real-world samples, such as groundwater.
- The findings highlight the potential of SERS for environmental monitoring and water quality assessment.
