How do you quantify quantum dots' molarity??

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Chemgod1
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How do you quantify quantum dots' molarity??

Hi,

I am running an experiment with cadmium telluride (CdTe) quantum dots. I need to know how to calculate molarity of QD's? I know I can use initial Cadmium concentration to calculate assuming I know the diameter of QD to be about 5-5nm. but I also need to know how many Cd ions there are in each QD (approximatly on average)?