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SEM images of the gold nanochestnuts grown at the top of the nanopillars by galvanic displacement at different reaction times: 10 min (a), 15 min (b), 20 min (c), 30 min (d), 45 min (e), and 65 min (f). Reproduced with permission from Geng et al. [351]. Copyright (2018), IOP Publishing Ltd.
