Synthesis and Characterization of MoSe2 and WSe2 Nanoclusters

The synthesis, characterization, absorption, and emission spectra of MoSe2 and WSe2 nanoclusters are reported. These nanoclusters are about 3.5−6 nm (MoSe2, see graphic) and 4−7 nm (WSe2) in diameter, as measured by TEM imaging. The particles are strongly quantum confined and highly anisotropic. Electron diffraction results indicate that they are three-atoms thick, consisting of a single two-dimensional Se−Mo−Se or Se−W−Se trilayer.