Synthesis of ZnS hollow nanospheres with holes using different amine templates

Abstract

ZnS hollow nanospheres with holes were prepared by reacting ZnSO 4 with H 2 S, the sulfide source formed in the reaction of CS 2 with ethylenediamine, 1,3-propylenediamine, butylamine or 2-(2-aminoethylamino) ethanol, which also acted as a template agent, at 50uC under agitation. The shape, particle size of about 100-850 nm and hole size of about 150-600 nm of ZnS hollow nanospheres with holes were shown by SEM and TEM images. These ZnS nanospheres with b cubic ZnS phase and composed of 2-5 nm nanocrystals were characterized by XRD and HRTEM. The blue shift of maximum absorption in UV-vis displayed the effect of quantum size. The two amino groups of amine templates reacted favorably with Zn 2+ to form uniform and relatively smooth ZnS nanospheres with holes, while hydroxyethyl played a disadvantageous role. A reasonable mechanism of hole formation by H 2 S rushing out is suggested.

Ethylenediamine-Mediated Wurtzite Phase Formation in ZnS

“…However, Jang et al obtained the porous plates composed of wurtzite ZnS nanocrystallites which are in the amorphous ZnS.0.5(EN), and after calcinations at temperatures of 400–500 ◦ C, remnants are ZnO, ZnS, and ZnS.0.5(EN) of solvothermally synthesized samples . Ouyang et al and R. Mosca et al also got ZnS.0.5(EN), having layered the wurtzite ZnS fragment using the same synthesis route in the presence of EN. , There are some more references on the synthesis of ZnS with EN; − the as-synthesized product has been reported to be a ZnS-EN complex, and high temperature annealing is needed to stabilize the wurtzite phase. Therefore, it is challenging to directly synthesize wurtzite ZnS and stabilize it at low temperature by controlling its transformation to the cubic phase.…”

“…Morphology control of ZnS nanocrystallites is another important factor in the manipulation of optical properties. The research efforts in the field of morphology control of ZnS have been mostly focused on fabricating one-dimensional (1D) nanowires or nanorods and two-dimensional nanosheets. − Therefore, the synthesis of ZnS nanoparticles of desired size, shape, crystalline phase, and composition by a simple synthesis method is interesting.…”

HF-Free synthesis of colloidal Cs2ZrF6 and (NH4)2ZrF6 nanocrystals

“…Hollowing has been observed in a variety of fluoride NCs, 35,36 and in some cases a sensitivity to surfactants has been demonstrated. 37 We thus hypothesized that altering the surface chemistry may affect NC hollowing. Following the same hotinjection procedure described above, capping ligands trioctylphosphine and oleylamine were now introduced to the reaction solution, in addition to oleic acid.…”