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(a) Porous PVDF nanofibers, whose porous structure was created by the mixture of solvents (acetone and DMF) [98]. Copyright 2018, Springer. (b) The difference in evaporation rate of methanol and DMF solvent formed the tube-in-tube structure of SnO2 nanofibers [100]. Copyright 2017, Royal Society of Chemistry. (c) The effect of heating rate on the inner tube structure of the Mn2O3/RuO2 tube-in-tube [101]. Copyright 2016, American Chemical Society.
