Whether absorbance spectrum of PbS quantum dots can be measured using ordinary UV- Visible spectrophotometer ?

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Ayan Sarkar

Have you tried by dispersing a little amount of PbS sample in ethanol/acetone/chloroform?

Emmanuel Lhuillier

Most of the time PbS QD have infrared exciton.

they absorb all visible wavelength in the visible which make them brown/dak in solution

very small PbS QD will have feature around 800nm and big one up to 2µm typically