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(A) Schematic representation of the synthesis procedure, starting with the solvothermal synthesis of magnetite NRs, which are modified with APTES, then by electrostatic binding of gold nanoclusters, and a final growth of a gold shell. (B) Schematic representation of the measurement procedure, by adding the NR@Au to an antibiotic-containing solution, magnetic separation and accumulation, and Raman measurement at the pellet spot.
