Moloto N, Moloto M J, Coville N J, Sinha Ray S
DST/CSIR Nanotechnology Innovation Centre, National Centre for Nano-Structured Materials, Council for Scientific and Industrial Research, Pretoria, 0001, Republic of South Africa.
J Nanosci Nanotechnol. 2010 Sep;10(9):5594-601. doi: 10.1166/jnn.2010.2479.
We report on the synthesis and characterization of cobalt sulphide (CoS(1.097)) nanoparticles using a cobalt tetramethylthiuram disulphide complex as a single-source precursor. To study the effect of reaction time on the optical and morphological properties of the synthesized nanoparticles, aliquots from the reaction mixture were collected after different intervals of time. The absorption spectra were time dependent, with the 5 min aliquot being the most blue-shifted from bulk and the subsequent samples showing a slight shift towards the bulk. Photoluminescence of the nanoparticles showed a single emission wavelength of 341 nm, however, the peak intensity of nanoparticles decreased with reaction time. The morphology of the synthesized nanoparticles was investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and high-resolution TEM (HR-TEM). Results from the SEM images showed the formation of spherical CoS(1.097) nanoparticles and the size of the observed nanoparticles increase with increasing reaction time. However, the TEM results showed a change in the morphology of the particles from spherical to wire-like. The change in morphology was thought to be induced by the high voltage electron beam and this was supported by the HR-TEM and optical results.
我们报道了以二硫化四甲基秋兰姆钴配合物作为单源前驱体合成硫化钴（CoS(1.097)）纳米颗粒及其表征。为了研究反应时间对合成纳米颗粒光学和形态性质的影响，在不同时间间隔后从反应混合物中取出等分试样。吸收光谱与时间有关，5分钟的等分试样相对于本体表现出最大的蓝移，随后的样品向本体方向有轻微的移动。纳米颗粒的光致发光显示单一发射波长为341nm，然而，纳米颗粒的峰值强度随反应时间降低。使用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、透射电子显微镜（TEM）和高分辨率TEM（HR-TEM）研究了合成纳米颗粒的形态。SEM图像结果显示形成了球形CoS(1.097)纳米颗粒，观察到的纳米颗粒尺寸随反应时间增加。然而，TEM结果显示颗粒形态从球形变为线状。形态的变化被认为是由高电压电子束引起的，这得到了HR-TEM和光学结果的支持。
