. Author manuscript; available in PMC: 2013 Jun 26.

Published in final edited form as: ACS Nano. 2012 May 24;6(6):5429–5439. doi: 10.1021/nn301308w

Table 1.

Size, zeta potential, and photophysical properties of PFBT dots with different density of side-chain carboxylic acid functional groups.

	PFBT-C2	PFBT-C14	PFBT-C50
a) Size (nm)	21	21	21
b) ξ (mV)	-50.2	-54.4	-57.5
c) Abs (10^-13 cm²)	2.69	2.36	1.17
d) Φ (%)	30±2	23±1	17±1
e) B (counts)	3350	2960	610

a): hydrodynamic size; b): zeta potential; c): absorption cross-section estimated from absorption spectra, the actual value for PFBT-C50 dots is lower due to their loose structure; d): fluorescence quantum yield; e): single-particle brightness (CCD counts/0.1s)