Fig. 2. Particle sizes and TEM images of AuNPs in different conditions. Experimental conditions: (a) AuNPs; (b) AuNPs + aptamer (400 nM), NaCl (300 nM) + acetamiprid (1 μg mL⁻¹); (c) AuNPs + aptamer (400 nM), NaCl (300 mM) + acetamiprid (5 μg mL⁻¹).