Doping

can cause a little change to lattice constant. Therefore, the present measurable shift of diffraction peak (about 0.05°) come from doped Mn because of the larger ionic radius of Mn2+ (0.80 Å) than that of Zn2+ (0.74 Å). Such shift of diffraction peak can also be observed in other doped nanostructures [17–19]. Therefore, manganese can diffuse and dope into ZnSe nanobelts efficiently when MnCl2 or Mn(CH3COO)2 were used as dopants. Figure 1 XRD patterns. click here (a) Pure ZnSe, ZnSeMn, , and nanobelts. (b) Enlarged (111) diffraction peak of the four samples. Figure 2a is a SEM image of pure ZnSe nanobelts, which deposited on the Si substrate randomly. The nanobelts have a length of hundreds of micro-meter, width of several micro-meter, and thickness of tens of nanometer. EDS (inset of Figure 2a) shows only Zn and Se elements (Si comes from the substrate). The atomic ratio of Zn to Se approaches to 1, demonstrating that pure ZnSe is stoichiometric. Figure 2b,c,d shows the SEM images of doped ZnSe nanobelts obtained using

Mn, MnCl2, Mn(CH3COO)2 as dopants. The belt-like IWR-1 morphology of ZnSeMn is similar with that of pure ZnSe but shows a little Milciclib research buy difference from those of and . The insets of Figure 2b,c,d are the corresponding EDS images. We cannot detect the Mn element, and the ratio between Zn and Se deviates a little from 1 in ZnSeMn nanobelts. The dopant concentrations are 0.72% and 1.98% in and nanobelts, respectively. Mn powder is hard to be evaporated due to its high melting point. Therefore, little manganese can dope into the ZnSe nanobelts under the present evaporation temperature when Mn powder was used as the dopant. MnCl2 and Mn(CH3COO)2 have Liothyronine Sodium low melting points and are easy to be evaporated. So, manganese can dope into the ZnSe nanobelts effectively when MnCl2 or Mn(CH3COO)2 were used as dopants. The MnCl2 and Mn(CH3COO)2 were usually used as dopants in other semiconductor nanostructures [16, 17]. We mapped the elements to detect the distribution of Mn dopant in the nanobelt. Figure 2e shows the EDS mapping of nanobelt. The mapping profiles

show that Mn, Zn, and Se elements distributed homogeneously within the nanobelt. Figure 2f is the EDS mapping of nanobelt, which shows that the distribution of Mn element is inhomogeneous. The minute inhomogeneous distribution of Mn can affect the optical property of the nanobelt greatly. Figure 2 SEM images and corresponding EDS and element mapping. (a) to (d) Pure ZnSe, ZnSeMn, , and nanobelts, respectively. The insets are the corresponding EDS images. (e) to (f) Element mapping of single cand nanobelts, respectively. Further characterization of these doped ZnSe nanobelt is performed by means of TEM operating at 300 kV. High-resolution TEM (HRTEM) can be used to describe the crystal quality and growth direction. Figure 3a is a TEM image of a ZnSeMn nanobelt.