Ethylenediamine assisted synthesis of wurtzite zinc sulphide nanosheets and porous zinc oxide nanostructures: near white light photoluminescence emission and photocatalytic activity under visible light irradiation

Zinc blende versus wurtzite ZnS nanoparticles: control of the phase and optical properties by tetrabutylammonium hydroxide

“…[1][2][3][4][5] The synthesis of ZnS nanocrystals with tunable size and phase not only provides alternative variables in tailoring the physical properties of this semiconductor material, but is also vital to develop them as building blocks in constructing the future nanoscale optoelectronic devices using the so-called ''bottom-up'' approach whereby atoms and molecules selforganize into nano-sized crystals or more complex molecular assemblies. 6,7 ZnS can adopt three phases: cubic zinc blende, hexagonal wurtzite or the rarely observed cubic rock salt.…”

“…[76][77][78] According to Lamer and Dinegar, 79 the precursor conversion reactions that limit the crystallization determine the temporal evolution of monomer concentration as well as the steady state supersaturation during the growth phase. In our case, the [Zn(SH) 4 ] 2À complex in solution can be considered as the growth unit for the ZnS nanostructures. [80][81][82] Therefore, we propose a growth process of ZnS nanostructures as shown in Fig.…”

Effect of thermal annealing on dual photoluminescence emission characteristics of chemically synthesized uncapped Mn2+ doped ZnS quantum dots

“…After the samples are annealed at 600 1C temperature, the UV PL emission peak appeared at $ 405 nm and the intensity is enhanced by $ 42% for undoped ZnS and $ 38% for ZnS:Mn as compared to that of as-synthesized sample. The increase in PL emission intensity at this annealing temperature may be due to the improved crystallinity of the newly formed phase of wurtzite ZnO and this emission takes place due to recombination of conduction band electrons with the zinc vacancy (V Zn ) in ZnO [25,26].…”

Photocatalytic reduction of Cr(VI) by using stacked ZnS layers of ZnS( en ) x complex

“…The net weight loss for the elimination of the amine organic is $18 wt.%, which is smaller than the value theoric (ca. 23 wt.%) [16,19], suggesting that the stoichiometry of the sheet is less than 0.5 (ZnS(en) <0.5 ). The third weight loss of 11% from 545 to 668 C is attributed to the oxidation of ZnS to ZnO.…”

“…Its photocatalytic activity was attributed to the strong quantum confinement effect, which provided the thermodynamic conditions to perform photocatalytic redox reactions and to be stable to the photocorrosion process. Several authors have also reported the photodegradation of organic molecules, dyes and phenolic, using this hybrid semiconductor of high crystallinity, of unique sheet morphology with high degree of intercalation of ZnS layers (superstructures), but with the low specific surface area [14][15][16]. Nevertheless, the effect of the morphology, including surface area property on the photocatalytic activity, with a controlled degree of ZnS layers intercalation has not been studied.…”