Three-dimensional (3D) GeO₂ nanowire networks were fabricated by using germanium as both a source material and catalyst in an oxygen-rich growth environment. The branches within one network show very regular orientation relationships: either perpendicular or parallel to each other. The nanowires follow a base-growth model and the growth direction is along <110>. The GeO₂ nanowire networks exhibit strong violet emission peaked at 404 nm under a 265 nm UV light excitation.



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