ZnS, CdS and HgS Nanoparticles via Alkyl-Phenyl Dithiocarbamate Complexes as Single Source Precursors

Abstract

The synthesis of II-VI semiconductor nanoparticles obtained by the thermolysis of certain group 12 metal complexes as precursors is reported. Thermogravimetric analysis of the single source precursors showed sharp decomposition leading to their respective metal sulfides. The structural and optical properties of the prepared nanoparticles were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) UV-Vis and photoluminescence spectroscopy. The X-ray diffraction pattern showed that the prepared ZnS nanoparticles have a cubic sphalerite structure; the CdS indicates a hexagonal phase and the HgS show the presence of metacinnabar phase. The TEM image demonstrates that the ZnS nanoparticles are dot-shaped, the CdS and the HgS clearly showed a rice and spherical morphology respectively. The UV-Vis spectra exhibited a blue-shift with respect to that of the bulk samples which is attributed to the quantum size effect. The band gap of the samples have been calculated from absorption spectra and werefound to be about 4.33 eV (286 nm), 2.91 eV (426 nm) and 4.27 eV (290 nm) for the ZnS, CdS and HgS samples respectively.

Synthesis and Characterization of Novel Diorganotin(IV) Complexes Derived from N-Methyl-phenethyl Dithiocarbamate and Bis(2-ethoxyethyl) Dithiocarbamate

“…All complexes produced a strong thioureide ν(C N) band in the range 1489-1479 cm -1 comparable to previous literature [23], which could be due to the increase of the carbon-nitrogen double bond character as the band is observed at a lower frequency in a free ligand [24]. This phenomenon occurs when electrons are delocalized towards the tin atom upon complexation [3].…”

“…Single sharp bands occurring in this region signifies bidenticity whereas splitting of the same band within a difference of 20 cm -1 in the same region signifies monodenticity or anisobidenticity [24]. A sharp single peak in the range of 986 to 971 cm -1 was observed in all three complexes, suggesting the bidentate behaviour of the ligand upon the tin center [25].…”

Structural and Optical studies of Traditional Indian Medicine: Kajjali & Narikela Lavan

“…11 The free orthorhombic sulphur also found at 22.4, 23.08, 26.95, 27.6, 33.61, 35 and 47.1 degree in 2Theta. 12 Grazing angle X-ray powder diffraction data along with the calculated lattice parameters and d-values for each reflection for the NaCl and meta-cinnabar samples are provided in Table 1 and Table 2. Figure 3(A) represents the two dimensional SEM image of 52 ± 5 nm NaCl nanostructures or Narikela Lavan.…”

Complexes of tetraethylthiuram disulphide with group 12 metals: single-source precursor in metal sulphide nanoparticles’ synthesis

“…Thus, it is a well-known technologically important material. Despite these applications of HgS nanoparticles, relatively less study is available due to difficulty in synthesis and toxicity of mercury (Onwudiwe and Ajibadercury 2011).…”