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a, b Infrared spectra of FeOOH nanorods (curve a) before layer-by-lay assembly and (curve b) after layer-by-lay assembly; nitrogen adsorption and desorption isotherms of FeOOH nanorods c before layer-by-lay assembly and e after layer-by-lay assembly at 77 K with corresponding pore-size distribution calculated by BJH method from desorption branch (d) and (f)
