Table 2 The zeta potentials on the surface of gold nanoparticles before and after the surface modification of ssDNA. The ssDNAs carry negative charges that make the surface potentials more negative after the modification.
Size of gold nanoparticles (nm) | Zeta potential before ssDNA conjugated (mV) | Zeta potential after ssDNA conjugated (mV) |
|---|---|---|
13 ± 2.6 | -13.99 ± 1.75 | -27.27 ± 1.03 |
45 ± 3.1 | -17.83 ± 1.31 | -28.69 ± 1.07 |
70 ± 4.9 | -19.14 ± 1.48 | -24.66 ± 1.88 |
110 ± 5.1 | -10.25 ± 0.80 | -19.48 ± 0.97 |