Figure 3

EDS spectra for InN _x cone (black) and InN nanowires (red), respectively. A relatively lower indium signal in InN _x microcones is probably due to nonuniform radial distribution of In and N in the micron-size cone with more N expected from core surface attachment of N in vapor. Due to the short penetration of electron beam used for EDS, the surface signals may be emphasized when compared to that of the inner part of the cone