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This is an update request for the document Periodic Porous Alloyed Au–Ag Nanosphere Arrays and Their Highly Sensitive SERS Performance with Good Reproducibility and High Density of Hotspots by Tao Zhang (43681), Yiqiang Sun (1938001), Lifeng Hang (4426780), Huilin Li (795365), Guangqiang Liu (1787232), Xiaomin Zhang (136250), Xianjun Lyu (4915237), Weiping Cai (299830) and Yue Li (102191)

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