We are interested in ITO glass. Can you please provide available specifications? We are also interested in quartz, CaF2, MgF2, and other optical substrates that can be used to fabricate SERS devices with minimal Raman background. Is it possible to supply ITO-coated quartz or ITO-coated fused silica substrates?
What Wafers Are Used for SERS?
Researchers developing Surface-Enhanced Raman Spectroscopy (SERS) devices require substrates that provide low background interference, excellent optical properties, and compatibility with plasmonic nanostructures. Common SERS substrate materials include ITO glass, quartz, CaF2, magnesium fluoride (MgF2), fused silica, silicon, and graphene-based platforms.
A researcher from a major university requested the following substrate for SERS fabrication:
Reference #196360 for specifications, availability, and pricing.
Thin Silicon Wafers for Raman Spectroscopy Analysis
Ultra-thin silicon wafers are frequently used in Raman spectroscopy research, MEMS fabrication, microfluidics, and nanotechnology applications. Researchers often require custom thicknesses and diced substrates for creating wells, microstructures, and sensing platforms.
I would like a thin silicon wafer approximately 1 µm thick to deposit onto another substrate and create a 1 µm deep well for Raman spectroscopy analysis. Rectangular pieces are preferred, and the smallest dimensions possible would be ideal.
Reference #268359 for specifications and pricing.
Get Your SERS Substrate Quote FAST! Or, Buy Online and Start Researching Today!
Why Are Gold and Silver Nanoparticles Used in SERS?
The extraordinary sensitivity of SERS comes from metallic nanostructures, typically gold or silver nanoparticles. These materials support localized surface plasmon resonance (LSPR), concentrating electromagnetic fields at the nanoparticle surface and dramatically increasing Raman signal intensity. As a result, SERS can detect trace concentrations of chemicals, biomolecules, pollutants, and pharmaceutical compounds that may be impossible to identify using conventional Raman spectroscopy alone.
Applications of Surface-Enhanced Raman Spectroscopy
- Biomedical Diagnostics – Detection of proteins, DNA, cancer biomarkers, and pathogens.
- Chemical Analysis – Identification of trace contaminants, pharmaceuticals, and industrial chemicals.
- Environmental Monitoring – Analysis of pollutants in water, air, and soil samples.
- Forensic Science – Detection of explosives, narcotics, and trace evidence.
- Materials Science – Characterization of thin films, nanoparticles, polymers, and coatings.
- Nanotechnology – Development of nanosensors, plasmonic devices, and advanced nanomaterials.
SERS vs. Conventional Raman Spectroscopy
Both SERS and Raman spectroscopy analyze molecular vibrations, but SERS provides dramatically greater sensitivity. Traditional Raman spectroscopy relies solely on molecular scattering, whereas SERS utilizes nanostructured metallic surfaces to amplify Raman signals by several orders of magnitude. This enhancement enables ultra-sensitive detection of molecules at extremely low concentrations and can even support single-molecule detection under optimized conditions.
What Are SERS Nanoparticles?
SERS nanoparticles are engineered nanostructures—typically gold, silver, nanostars, nanorods, or nanospheres—that enhance Raman scattering through plasmonic effects. These nanoparticles can be functionalized with antibodies, proteins, DNA probes, or other molecules to create highly selective biosensors for medical diagnostics, environmental testing, and chemical sensing applications.
Understanding the Virtual State in Raman Spectroscopy
A virtual state is a short-lived intermediate energy state created when incident photons interact with a molecule during Raman scattering. The energy difference between the incoming and scattered photons provides information about molecular vibrations, making Raman spectroscopy and SERS powerful tools for molecular identification, chemical analysis, and materials characterization.
What is Surface-Enhanced Raman Spectroscopy (SERS)?
Surface-Enhanced Raman Spectroscopy (SERS) is an advanced analytical technique that dramatically increases the sensitivity of conventional Raman spectroscopy. By combining Raman scattering with nanostructured metallic surfaces, SERS can detect molecules at extremely low concentrations, making it valuable for chemical analysis, biomedical research, environmental monitoring, pharmaceutical development, and nanotechnology applications.
Unlike traditional Raman spectroscopy, SERS utilizes specially engineered substrates containing metallic nanostructures that amplify electromagnetic fields near the surface. This enhancement can increase Raman signal intensity by factors exceeding 106–1011, allowing researchers to identify trace amounts of analytes that would otherwise be difficult to detect.
What is a SERS Substrate?
A SERS substrate is the foundation of any Surface-Enhanced Raman Spectroscopy system. These substrates typically consist of nanostructured metals such as gold, silver, or copper deposited on silicon, glass, quartz, graphene, or other supporting materials. The nanostructures create localized surface plasmon resonances (LSPR), generating highly concentrated electromagnetic "hot spots" that significantly enhance Raman scattering signals.
The performance of a SERS substrate depends on several factors, including material selection, surface morphology, nanostructure geometry, substrate uniformity, and fabrication method. Optimized substrates provide higher sensitivity, reproducibility, and detection limits for analytical measurements.
What Wafers and Substrates Are Used for SERS?
Researchers commonly use a variety of wafer materials to fabricate SERS-active surfaces, depending on the application requirements. Popular substrate materials include:
- Gold-Coated Silicon Wafers
- Silver Nanostructured Substrates
- Silicon Wafers
- Thermal Oxide Silicon Wafers
- Graphene Substrates
- Quartz Wafers
- Fused Silica Substrates
- Calcium Fluoride (CaF₂) Substrates
- Gallium Arsenide (GaAs)
- ITO-Coated Glass
One commonly requested SERS platform is a 100mm P-type Boron-doped (100) silicon wafer with 500nm thermal oxide. Researchers use these substrates as a foundation for depositing gold, silver, and other plasmonic nanostructures that generate strong Raman enhancement effects.
Why Silicon Wafers Are Popular for SERS Research
Silicon wafers remain one of the most widely used substrate materials for SERS device fabrication because they are cost-effective, readily available, compatible with semiconductor processing techniques, and suitable for microfabrication. Silicon also allows researchers to integrate SERS structures with MEMS devices, biosensors, microfluidics, and lab-on-a-chip systems.
Thermal oxide-coated silicon wafers are especially popular because the oxide layer provides electrical isolation while supporting the deposition of plasmonic metals and nanostructures required for high-sensitivity Raman measurements.
Advantages of SERS Technology
- Ultra-high sensitivity for trace molecular detection
- Non-destructive chemical analysis
- Rapid identification of biological and chemical compounds
- Minimal sample preparation requirements
- Capability for single-molecule detection in optimized systems
- Compatibility with biosensors, microfluidics, and semiconductor devices
As advances in nanofabrication continue, SERS substrates based on silicon, graphene, gold, silver, and engineered nanomaterials are enabling increasingly sensitive detection platforms for biomedical diagnostics, environmental monitoring, food safety testing, pharmaceutical research, and advanced materials characterization.
Related Raman Spectroscopy & SERS Resources
- Raman Spectroscopy Measurements
- Gold-Coated Silicon Wafers
- Silicon Wafers
- Thermal Oxide Silicon Wafers
- Graphene Substrates
- ITO Glass Substrates
- Single Crystal Quartz Wafers
- Fused Silica Wafers
- Calcium Fluoride (CaF₂) Substrates
- Nanotechnology Research
- Materials Science Applications
- Biosensor Development
- Thin Silicon Wafers