The PThTA nanoparticles were nitrated for better solubility in THF as a GPC eluent. Owing to the poor solubility of PTh, nitration of the PTh nanoparticles was carried out with mixed acids (95% H2SO4: 61% HNO3: H2O = 1.00: 0.17: 0.13 v/v) prior to GPC analysis.