Table 1. Coating Sequence and Resulting Zeta Potential.

name	surface structure	zeta potential (mV)
PSS AuNRs	sulfonate	–43.33 ± 0.65
PAH AuNRs	amine	+37.31 ± 1.16
silica AuNRs	silanol	–27.62 ± 0.58
amine–silica AuNRs	amine	+29.19 ± 0.92