I am using a DelsaNano C to quantify the size and distribution of CdSe quantum dots (narrow size distribution ranging from 1 to 20 nm). Until now I have not succeeded. I am sure I have quantum dot suspensions with different particle sizes and narrow distribution; this is concluded from the fluorescence spectra of these samples. However, when I use the DelsaNano C to quantify, even the bigger particles, I do not have reproducible distributions and most of the time I get an error: “Invalid data” during the post-processing of the raw data. I believe that one problem could be the high fluorescence of these samples. Even so, the irradiation wavelength of the DelsaNano C (658 nm) does not match with the spectral range of the excitation of the samples. Perhaps the QD concentration is not enough; however the “intensity indicator” of the DelsaNano indicates that the intensity is “optimum”. Could you please help me to solve this problem? Some guidelines for the size determination of these particular particles is welcomed.
Do you get a reproducible and accurate answer with the (calibrated) polystyrene spheres suspension that you (hopefully) received together with the machine?
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