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The term SnO 2 nanoarrays refers to the alignments of SnO 2 nanounits on different substrates, whose design and synthesis have attracted considerable attention due to their range of promising applications. We summarize various synthetic strategies towards the dimension-, size-and shape-controlled synthesis of SnO 2 nanoarrays on various substrates, providing the rational understanding on their on-purpose design through the control of growth parameters. The properties of SnO 2 nanoarrays related to their energy storage and conversion applications as anode materials for lithium ion batteries and photoanodes of dyesensitized solar cells are reviewed. CrystEngCommThis journal is Fig. 5 (a) Tilted view and (b) cross-section images of double-layered SnO 2 hemispheres on a Si substrate. Reproduced with permission. 35

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