Clear complementarity: Surface chemistry induced morphology transformation in layered titanate nanostructures can be used to control their photoelectronic properties. Na2Ti3O7 nanowires can be transformed reversibly into nanotubes with acid/base treatment (see picture); the nanowires exhibit photoluminescence, which is suppressed in the nanotubes, while the charge separation is stronger in the nanotubes.
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Riss et al. (2008) studied this question.
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