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(A): schematic presentation of the hot spots generated by aggregating sodium borohydride-induced silver nanoparticles. Ag@BO: Silver nanoparticles were obtained by reducing sodium borohydride. (B): Schematic diagram of the virus in the hot spots. Ag@BONNPs: The enhanced substrate formed by adding Na+ to the silver nanoparticles produced by sodium borohydride reduction.
