Mechano-chemical synthesis and optical properties of ZnS nanoparticles

作者：Pathak C S^*; Agarwala V; Mandal M K

来源：Physica B: Condensed Matter , 2012, 407(17): 3309-3312.

DOI：10.1016/j.physb.2012.02.033

• Mechanochemical
• Milling
• Semiconductor nanoparticles
• Optical absorption
• Band gap

In the present work, we report the synthesis and optical properties of ZnS nanoparticles produced by the mechano-chemical route. We used zinc acetate and sodium sulphide as source materials in a high energy planetary ball mill at rotation speed of 300 rpm and vial rotation speed of 600 rpm with ball to powder (BPR or charge ratio CR) 5:1 for 30 and 90 min. The milled powders were washed with methanol to remove impurity and dried at 300 degrees C for 1 h. The prepared nanoparticles have been characterized using X-ray diffraction (XRD), Field emission scanning electron microscope (FESEM), UV-vis-NIR spectrophotometer and Fluorescence spectroscopy. The crystallite size of the synthesized ZnS nanoparticles is found to be in the range 7-8 nm which was calculated using Debye-Scherer's formula. The value of optical band gap has been found to be in the range 3.80-4.15 eV. Room temperature photoluminescence (PL) spectrum of ZnS samples exhibit a blue emission peaked at 466 nm under UV excitation.

• 出版日期2012-9-1