Figure 4

Characterization of SA-AuNPs and probe-SA-AuNPs, (a) transmission electron microscopy (TEM) imaging of SA-AuNPs at 20 nm size, (b) TEM imaging of SA-AuNPs at 40 nm size, (c) absorbance spectra of colloidal SA-AuNPs and probe-SA-AuNPs (SA-AuNP-biotin probe), (d) TEM of positive samples with probe-SA-AuNPs, (e) TEM of negative samples with probe-SA-AuNPs.