Fig. 2

(a)–(f) show the SEM image of the MoSe\(_{2}\)/WSe\(_{2}\) powder with different thermal annealing temperatures in the backscattering emission image mode. The EPMA result supports that the \(\mathrm {W}{:}\mathrm {Se} = 1{:}2\) in the light zone and \(\mathrm {Mo}{:}\mathrm {Se} = 1{:}2\) in the dark zone. The MoSe\(_{2}\) and WSe\(_{2}\) individually locate after 1100° thermal annealed. The others are chemically bonded