Abstract
We apply real-time video microscopy to monitor the formation of rolled-up InAs∕GaAs tubes in great detail. The roll-up process is highly nonlinear at the beginning, linear at an intermediate stage, and ceases for long etching times. This self-limitation effect allows precise positioning of the tubes on a substrate surface. We investigate the formation of rolled-up nanotubes (RUNTs) on lithographically patterned substrates as a function of sacrificial layer thickness and tube diameter, and our results are well-described by a simple diffusion model. We fill well-positioned RUNTs of well-defined lengths with dye liquid and we observe strong fluorescence signal of these structures in the red spectral range.
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