Figure 8From: Tube Formation in Nanoscale MaterialsIllustration of ZnO tubes via a chemical etching process.a SEM image of ZnO tube through an in situ template route based on a chemical etching reaction. Formation mechanism of in situ template route:b formation of truncated ZnO template.c Six pits observed at the six corners of the top surface of an truncated ZnO taper after etching.d Further etching of the truncated taper.e Formation of ZnO tube by dissolving ZnO coreBack to article page