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(A)TEM of synthesized AuNPs, (B) TEM of aggregated AuNPs, (C) IR of aggregated AuNPs, (D) IR of AuNPs, (E) spectrum of synthesized AuNPs and aggregated AuNPs spectrum in optimum condition and (F) aggregation spectra of AuNPs up to 10 min in the presence of morphine 10 µg/mL. Conditions: temperature 25 °C, ionic strength 1 mmol/L and pH 6.
