Structural and optical characterization of Ni-doped CdS quantum dots |
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| Authors: | M Thambidurai N Muthukumarasamy S Agilan N Sabari Arul N Murugan R Balasundaraprabhu |
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| Affiliation: | (1) Department of Physics, Coimbatore Institute of Technology, Coimbatore, India;(2) Department of Nanoscience and Technology, Bharathiar University, Coimbatore, India;(3) Department of Mechanical Engineering, Coimbatore Institute of Technology, Coimbatore, India;(4) Department of Physics, PSG College of Technology, Coimbatore, India |
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| Abstract: | Ni-doped CdS quantum dots have been prepared by chemical precipitation technique. The X-diffraction results indicated that
the particle size of Ni-doped CdS nanoparticles is smaller than that of undoped CdS and no secondary phase was observed. The
average grain size of the nanoparticles is found to lie in the range of 2.7–4 nm. The compositional analysis results show
that Cd, Ni, and S are present in the samples. HRTEM studies reveal that the average particle size of undoped and Ni-doped
CdS quantum dots is 2 and 3 nm, respectively. Raman spectra shows that 1LO, 2LO, and 3LO peaks of the Ni-doped CdS samples
are slightly red shifted when compared to that of undoped CdS. The absorption edge of Ni-doped CdS nanoparticles is found
to shift towards the higher-wavelength (red shift) side when compared to that of undoped CdS and the band gap is observed
to lie in the range of 3.79–3.95 eV. This band gap is higher than that of the bulk CdS and is due to quantum confinement effect
present in CdS nanoparticles. |
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