水溶液法制备CdSe和ZnSe纳米棒

Aqueous synthesis of ZnSe and CdSe nanorods

用水溶液法直接合成了水溶性、发荧光的ZnSe和CdSe纳米棒。ZnSe纳米棒的直径约20～30nm,长度可达60～70nm;CdSe纳米棒的直径约30～60nm,长度可达150～450nm。用X射线衍射仪(XRD)、透射电镜(TEM)、高分辨透射电镜(HR-TEM)、荧光仪等仪器对纳米棒进行了表征。XRD和HRTEM的结果显示纳米棒具有立方结构,结晶度较高。讨论了纳米棒的形成机理以及pH对纳米棒发光强度的影响。合成的纳米棒在水溶液中至少稳定半年,表面被氨基和羧基化,在生物分析中具有广泛的应用前景。

Water-soluble,photoluminescent ZnSe and CdSe nanorods（NRs） were directly synthesized in aqueous media at low temperature.The as-synthesized ZnSe nanorods were 20-30nm in diameter and 60-70nm in length.The as-synthesized CdSe nanorods were 30-60nm in diameter and 150-450nm in length.The products were characterized by means of X-ray diffraction （XRD）,transimission electron microscopy （TEM）,high-resolution transimission electron microscopy （HRTEM）,photoluminescence.The results of XRD and HRTEM showed that the as-prepared nanorods had high crystallinity and cubic structure.The detailed formation mechanism and the effect of pH value on the photoluminescence （PL） intensity were also discussed.These nanorods were functionalized on their surface with carboxylic group and amino group and photoluminescence was stable for half a year at least,suggesting possible biological applications.