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SiV–Ag structures. (a) Schematic illustration of the diamond-encapsulated Ag nanoparticles with embedded SiV centers. The SiV center consists of a Si atom between two adjacent carbon vacancies in the diamond lattice. (b) Room temperature photoluminescence spectrum of SiV centers. (c) SEM and (d) TEM images of the Ag–diamond core–shell structure, showing a columnar growth structure like that depicted in (a).
