Does anyone have practical steps or advice for preparing and measuring dark-colored solid samples using UV–DRs to obtain reliable RESULTS?

21 August 2025 1 1K Report

I am measuring the band gap of dark-colored solid materials using a UV–Vis spectrometer. However, all materials give nearly identical results, making it difficult to distinguish between them or extract accurate band gap values.

Abdelhak Maghchiche

To reliably measure band gaps of dark-colored solids using UV-DRS, prepare homogeneous, diluted samples mixed with a reflective matrix like BaSO4 and use diffuse reflectance with Kubelka-Munk data processing. Ensure consistent measurement conditions and replicate sampling to avoid signal saturation and improve differentiation.

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