Fig. 2

UV–Vis–NIR spectrophotometer of the naked AuNPs and AuNPs-FMDV biosensor: curve A the UV–Vis–NIR spectrophotometer in the visible region image showing one absorption peak of 520 nm representing 13 nm of naked AuNPs. Curve B the UV–Vis–NIR spectrophotometer in the visible region image showing one absorption peak of 260 nm representing free oligonucleotides. Curve C the UV–Vis–NIR spectrophotometer in the visible region image showing two absorption peaks one for AuNPs at 520 nm and the other was for conjugated oligonucleotides at 260 nm forming of AuNPs-FMDV biosensor