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Sökning: WFRF:(Singhal Sandeep) > Kungliga Tekniska Högskolan

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1.
  • Chawla, Amit Kumar, et al. (författare)
  • Study of composition dependent structural, optical, and magnetic properties of Cu-doped Zn1-xCdxS nanoparticles
  • 2010
  • Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 108:12, s. 123519-
  • Tidskriftsartikel (refereegranskat)abstract
    • Cu-doped Zn1-xCdxS nanoparticles were synthesized by coprecipitation technique in ice bath at 280 K. The band gap energy of Zn1-xCdxS:Cu nanoparticles can be tuned to a lower energy by increasing the Cd content, indicating the formation of the alloyed nanoparticles. The alloy structure is further supported by the systematic shifting of characteristic x-ray diffraction peaks to lower angles with increase in Cd content. Systematic copper doping induces a red shift in the energy band gap of Zn0.9Cd0.1S:Cu nanoparticles with increase in copper concentration. Cu-doped Zn0.9Cd0.1S nanoparticles were found to have ferromagnetic nature at 5 K whereas undoped particles were found to be diamagnetic. Green luminescence further proves proper doping of Cu into the ZnCdS matrix. It is believed that the green luminescence originates from the recombination between the shallow donor level (sulfur vacancy) and the t(2) level of Cu2+. This method provides an inexpensive and simple procedure to produce ternary ZnCdS: Cu nanoparticles with tunable optical properties via changing Cd and/or Cu concentrations.
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2.
  • Singhal, Sonal, et al. (författare)
  • Photoluminescence measurements in the phase transition region of Zn1-x Cd (x) S films
  • 2010
  • Ingår i: Journal of nanoparticle research. - : Springer Science and Business Media LLC. - 1388-0764 .- 1572-896X. ; 12:4, s. 1415-1421
  • Tidskriftsartikel (refereegranskat)abstract
    • Thin films of Zn1-x Cd (x) S (0.1 a parts per thousand currency sign x a parts per thousand currency sign 0.5) were prepared by using pulsed laser ablation technique on corning glass substrates. Phase transition from cubic to hexagonal in Zn1-x Cd (x) S films is determined by X-ray diffraction analysis. We observed a lowering in the phase transition temperature with increase in the cadmium concentration. Transmission electron microscopy suggests the crystalline nature of thin films with average particle size of 15 nm. The grown Zn1-x Cd (x) S samples show the high peak intensity ratio of the near band edge emission to the defect center luminescence even at room temperature, which indicates the small concentration of complex defects in the samples. Photoluminescence measurement show stoichiometric dependence of the energy band gap and is found to have quadratic dependence on x.
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  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
Typ av innehåll
refereegranskat (2)
Författare/redaktör
Nagar, Sandeep (2)
Chandra, Ramesh (2)
Chawla, Amit Kumar (2)
Singhal, Sonal (2)
Gupta, Hari Om (2)
Lärosäte
Kungliga Tekniska Högskolan  (2)Ta bort avgränsningen
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Engelska (2)
Forskningsämne (UKÄ/SCB)
Teknik (1)
År
2010 (2)

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