Baku State University Master student of Department of Physics Amrahova Aynur

1. Baku State UniversityMaster student of Department of Physics Amrahova Aynur This work was carried by the master studentes of department of chemical H.Nurana, Q.Eldar Email:AynurAmrahova@gmail.com Phone:+994505169529

2. Formation of CdS nanoparticles

3. Introduction Here we shall report a convenient synthetic method of CdS nanoparticles by ultrasonic irradiation of a mixed solution of CdCl2, Na2S2O3 and (CH3)2CHOH in Ar atmosphere and the irradiotion of the powder of CdS in distilled water.The whole process is carried at room temperature and ambient pressure.

4. Reagents Cadmium chloride(CdCL2* 2.5 H2O) - 0.9 g Sodium tiosulphate(Na2S2O3* 5 H2O) - 1.2 g Isopropyl alcohol((CH3)2CHOH)) – 24ml Doubly distilled water -51 ml

5. ULTRASONİC VCX-500 Power – 500W 20Khz

6. Formation mechanism of CdS nanoparticles

7. Depositing CdS nanoparticles after a day

8. CdS Nanocomposits

9. Dependence of (αhv)٨2 on energy of fotons for CdS nanoparticles

10. The band gap energy of CdS nanoparticles wich was obtained from this experiment is: Eg=3.7 ev and the size is 6,7 nm

11. Second experiment The conseption of down to up.This is the method of sedimentation.From this flask we took part of this solution in different hours and analysed it in SPECORD250 UV-VIS.

12. Dependence of (αhv)٨2 on energy of fotons for powder of CdS

13. The band gap energies corresponding to the spectrum wich was shown in former slide in different hours

14. Summary Ultrasonic irradiation has been successfully used to prepare CdS nanoparticles at room temperature.The advantage of this method is that it is a simple and efficent way to produce nanoparticles, which could find use in modern electronic and electrooptical devices.By appropriate control of the different surfactants, carriers and solvents, we predict that the ultrasonic reduction method may be extended to the preparation of metal sulfide semiconductor nanoparticles in aqueous systems

15. Conclusion The broad absorption band can be attributed to a surface state of CdS nanoparticles, because the absorption lies below the absorption edge of the particles and the absorption energy is lower than the band gap of the particles,which are corresponding well to CdS particles as previously reported

16. Acknowledgements For this work we thank E.Gonche PH.D. She is acknowledged for her help in all measurements.

17. Thank you for your attention