UV/VIS/NIR
What is UV-Vis/NIR Spectroscopy?
UV-Vis/NIR spectroscopy measures how a sample absorbs or transmits light across the ultraviolet (UV), visible (Vis), and near-infrared (NIR) regions. The resulting spectrum reveals information related to electronic transitions (UV-Vis) and overtone/combination vibrational bands (NIR), supporting both quantitative concentration measurement and material/optical property characterization.
UV-Vis/NIR is widely used for solutions, thin films, coatings, glasses, polymers, semiconductors, nanoparticles, and optical materials for applications such as color control, absorbance/transmittance, band-edge behavior, and process/QC monitoring.
What UV-Vis/NIR Can Help You Solve
Concentration/assay measurement using Beer–Lambert law (with standards or calibration curve)
Color and appearance control (absorbance spectrum, color consistency checks)
Optical performance evaluation (transmittance/absorbance in UV/Vis/NIR ranges)
Material comparison (batch-to-batch, supplier comparison, before/after aging)
Thin film & coating characterization (absorbance/transmittance vs wavelength; comparative QC)
Nanomaterials screening (plasmon peaks, dispersion quality—project-dependent)
Typical Applications
Chemicals & solutions: concentration verification, impurity screening by spectral changes
Pharmaceutical & biotech: protein/nucleic acid absorbance (project-dependent), assay support
Optical materials: glass, filters, lenses, films—UV cut-off and NIR transmission checks
Coatings & polymers: UV-blocking coatings, optical clarity, aging/yellowing evaluation
Semiconductor & displays: substrate/film transmission, absorption edge trends (project-dependent)
Nanoparticles & pigments: dispersion and peak shift monitoring (project-dependent)
Test Capabilities & What You Receive
Measurement Modes (project-dependent)
Absorbance / Transmittance / Reflectance vs wavelength
Solution testing (cuvette-based)
Solid and film testing (transmission or reflectance configurations, as applicable)
Baseline correction and comparative overlays for multiple samples
Quantitative analysis (single-point using known absorptivity or calibration curve)
Deliverables
UV-Vis/NIR spectra (plots and data)
Key metrics at specified wavelengths (e.g., %T at 550 nm, UV cut-off wavelength)
For quantitative projects: calculated concentration with method details and QC checks
Comparison summary and pass/fail vs your specification (if provided)
Sample Requirements
Liquids / Solutions
Typical volume: ~2–5 mL (depends on cuvette type and repeats)
Clarity: minimize bubbles and particulates (filter if compatible)
Solvent/matrix: provide solvent identity and expected concentration range
Containers: clean, tightly sealed, labeled
Solids / Films
Flat, clean surfaces preferred; provide thickness if known
Indicate whether measurement is transmission (transparent samples) or reflectance (opaque samples)
Information to provide: target wavelength range (UV/Vis/NIR), required reporting metrics, spec limits, and any reference/control sample.
Workflow
Requirement review (measurement mode, wavelength range, quant vs comparison, spec limits)
Sample preparation guidance (dilution, filtration, cuvette/path length selection, mounting for solids)
Instrument setup (baseline/reference, scan parameters)
Measurement and repeat checks as needed
Data processing (baseline correction, peak/edge metrics, calibration calculations)
Reporting (spectra + results table + conclusions)
FAQs
Can UV-Vis/NIR identify unknown materials?
UV-Vis/NIR is great for comparison and for systems with known spectral signatures, but it is not always definitive for unknown identification. For unknowns, complementary methods such as FTIR, Raman, GC/MS, or LC-MS may be recommended.
Can you measure very concentrated or strongly absorbing samples?
Yes—typically by dilution, using a shorter path length, or adjusting measurement configuration. Provide expected absorbance range if known.
What’s the difference between UV-Vis and NIR information?
UV-Vis mainly reflects electronic transitions (color, band-edge behavior). NIR often relates to overtone/combination bands and can be useful for certain compositional or moisture-related trends (matrix-dependent).
Can you report transmission at specific wavelengths (e.g., 365 nm, 550 nm, 1064 nm)?
Yes. Tell us your required wavelengths and acceptance criteria, and we will report the specified metrics.
Do you provide calibration curves for concentration measurements?
Yes. If you provide standards (or we prepare them per your guidance), we can build a calibration curve and report concentration with QC checks.
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