Ali Moazzam, Sarma D D
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.
J Nanosci Nanotechnol. 2007 Jun;7(6):1960-4. doi: 10.1166/jnn.2007.748.
Colloidal ZnSe nanocrystals were synthesized in hot mixtures of long-chain alkylamines, fatty acids, and alkylphosphines. It was possible to tune the size of nanocrystals by varying the reaction time. Transmission electron microscope images showed the presence of spherical ZnSe nanocrystals and X-ray diffraction pattern of ZnSe nanocrystals showed the existence of both the crystalline phase, namely, wurtzite and zinc blende. The ZnSe nanocrystals were then passivated with higher band gap ZnS; this lead to a 2.6-fold enhancement in the integrated photoluminescence intensity of ZnSe nanocrystals. We also synthesized the reverse type core/shell ZnS/ZnSe nanocrystals. These exhibited a significant red shift in the absorption edge after coating with a thin ZnSe shell.
在长链烷基胺、脂肪酸和烷基膦的热混合物中合成了胶体ZnSe纳米晶体。通过改变反应时间可以调节纳米晶体的尺寸。透射电子显微镜图像显示存在球形ZnSe纳米晶体，ZnSe纳米晶体的X射线衍射图谱表明存在两种晶相，即纤锌矿和闪锌矿。然后用带隙更高的ZnS对ZnSe纳米晶体进行钝化；这导致ZnSe纳米晶体的积分光致发光强度提高了2.6倍。我们还合成了反型核/壳ZnS/ZnSe纳米晶体。在用薄ZnSe壳包覆后，这些纳米晶体在吸收边缘出现了明显的红移。
