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(a) SPE modified with AuNPs, silica nanospheres (SNs), DNA and MB. (b) SPE modified with AuNPs, SNs, DNA, cadmium chloride (CdCl) and MB. (c) SPE modified with AuNPs, SNs and MB. (d) SPE modified with AuNPs, SNs and DNA. (e) SPE modified with AuNPs and SNs.
