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The optical properties of lead sulfide semiconducting nanoparticulate thin films with pancake-like structures are controlled by the lowest dimension of the particles, which is a consequence of 1D quantum confinement. Optical absorption and photoluminescence spectra of the nanoparticles (see Figure) reveal that their bandgap does not change with temperature in contrast to bulk lead sulfide.
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Nanda et al. (2001) studied this question.
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