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Dear student,

Following techniques are used for characterization of quantum dots:

1. Size characterization :
i) SEM- Scaning Electron Microscopy
ii) TEM-Transmission Electron Microscopy
iii) DLS- Dynamic Light Scattering
iv) AFM-Atomic Force Microscopy 

2. Optical characterization:
i) UV-VIS Spectroscopy
ii) Photoilluminisence spectroscopy

3. Characterization of surface chemistry 
i) X-Ray photoelectric Spectroscopy 
ii) NMR-Nuclear Magnetic Resonance Spectroscopy 
iii) Rutherford backscattering

Regards,