How CdS nanomaterials identify by the UV-spectrometer, Photoluminescence (PL), DLS and FTIR easily. Give me the ideas and simple characterization procedure. Also most welcome for such type of papers which have information regarding my question.
CdS can easily be characterized by the above methods mentioned by you. In Uv-Vis you will get a very stiff/straight soulder at around 470-500 (2.42 eV) nm for wurtzite CdS. If it is zinc blend, absorption will be at lower wavelength. But generally no PL for CdS. Moreover, from the absorption peak, you can find the size of CdS particle following a certain principle published in Chemistry of Materials. DLS gives the hydrodynamic radii and FTIR is not much applicable, only the identification of surfactant around it. Best way is XRD and HRTEM
You can use UV-Visible spectroscopy for your identification. You can obtain shoulder peak around 400 to 500 nm for CdS nanoparticles. However, depending on your particle size, it may shift. However, FTIR not good technique for your work (Mid IR). Near IR can be use for identify metal sulphide bond. But Raman spectroscopy is good for this. You also can apply XRD too.
http://www.ias.ac.in/pramana/v65/p801/fulltext.pdf
All the above techniques are pretty efficient in identifying CdS nanoparticles. Another technique which is worth a shot in case you want to determine non-uniformity of particle dimentions is by spectroscopic ellipsometry. For that a thin-film has to be made from the colloidal solutions. Done as a real time analysis, this technique can give a sense of changes of the nano-particle over time, which is a good way of detecting the stability of the colloidal particles.
Its really worthy and helpful to me ......thanks Rajashree Chakravarti. Will you share any link or pdf.
CdS nanocrystals are characterized by extense separation between absorbance peak (380-450 nm) and a broadened PL emission, due to surface deffects, CdS has a wide band gap, but in order to obtain UV-Vis emission core-shell structure is necessary. Without shell, CdS colloids have red-orange to yellow emission due to band-intraband transitions. The paper that Lakmal gave to you is a good reference.
Mr. Kenneth I want to synthesize CdS NCs for detection of polluted substances in field.
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