Evolution of nanostructure with reaction time for ZnS synthesized by solvothermal process

Abstract

ZnS nanostructures has been successfully synthesized from zinc acetate [(CH3COO)2Zn; 2H2O] and thiourea (NH2CSNH2) by solvothermal process with ethylenediamine (en) solvent at 180 °C for three different reaction times (1 h, 3 h and 5 h) respectively. Various techniques such as XRD, SEM and TEM are employed for structural characterization whereas the composition and chemical purity are determined using EDAX. Photoluminescence studies show broad emission peak around 360 nm corresponding to Zn2+ and S2‐ transitions. In addition, two small sharp peaks originating from vacancy and interstitial states are also observed. Electrical transport studies at room temperature and above predict thermally activated behavior typical of semiconductors (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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.…”