Addition/Correction pubs.acs.org/ac
Correction to Optical and Electrochemical Methods for Determining the Effective Area and Charge Density of Conducting Polymer Modified Electrodes for Neural Stimulation Alexander R. Harris,* Paul J. Molino, Robert M. I. Kapsa, Graeme M. Clark, Antonio G. Paolini, and Gordon G. Wallace Anal Chem. 2015, 87, 738−746. DOI: 10.1021/ac503733s In Table 1 and Table 2 in the original manuscript, the values for the linear electroactive area were calculated using a scan rate in mV s−1 rather than V s−1. The corrected values for the electrode area and charge density are given here. The ordinate axes in Figures 3b,d, 4b,d, and 5c−f will be affected, but this has no impact on the correlations or conclusions in the original manuscript. Table 1. Average, Standard Deviation, and Coefficient of Variation of Electrode Area Measured Optically or by Reduction of Ru(NH3)63+ for a Steady-State or Linear Electroactive Area optical area (μm2)
steady-state electroactive area (μm2)
linear electroactive area (μm2)
polymer coating
avg
SD
CV
avg
SD
CV
avg
SD
CV
15 s PEDOT-PSS 30 s PEDOT-PSS 45 s PEDOT-PSS 60 s PEDOT-PSS 45 s PEDOT-pTs uncoated 15 s PEDOT-DBSA 30 s PEDOT-DBSA 45 s PEDOT-DBSA 60 s PEDOT-DBSA 45 s PEDOT-pTs uncoated
985.8 1558.0 1813.5 2245.1 710.8 403.5 816.5 1105.1 1432.5 1651.0 678.3 430.5
128.6 79.2 201.1 197.7 31.6 24.6 95.8 165.3 242.4 340.8 59.2 13.0
0.13 0.05 0.11 0.09 0.04 0.06 0.12 0.15 0.17 0.21 0.09 0.03
123.6 833.7 − − 174.1 119.8 304.4 466.3 673.2 693.7 246.8 103.0
1.0 − − − 89.9 66.8 112.2 193.5 199.3 64.2 43.1 8.3
0.01 − − − 0.52 0.56 0.37 0.41 0.30 0.09 0.17 0.08
9181.4 7055.5 6367.1 10173.0 661.7 544.5 1072.6 1675.6 2426.7 3200.0 848.3 483.8
7635.0 2156.1 2745.0 4100.4 274.6 226.9 73.2 228.3 455.5 368.6 78.0 21.1
0.83 0.31 0.43 0.40 0.42 0.42 0.07 0.14 0.19 0.12 0.09 0.04
Table 2. Average, Standard Deviation, and Coefficient of Variation of Electrode Charge Density Measured from the Reduction Charge and Optical, Steady-State, or Linear Electroactive Area optical charge density (mC/cm2)
steady-state charge density (mC/cm2)
linear charge density (mC/cm2)
polymer coating
avg
SD
CV
avg
SD
CV
avg
SD
CV
15 s PEDOT-PSS 30 s PEDOT-PSS 45 s PEDOT-PSS 60 s PEDOT-PSS 45 s PEDOT-pTs uncoated 15 s PEDOT-DBSA 30 s PEDOT-DBSA 45 s PEDOT-DBSA 60 s PEDOT-DBSA 45 s PEDOT-pTs uncoated
121.4 104.6 111.3 130.4 18.6 15.8 49.5 95.1 42.8 76.1 16.5 14.2
222.9 86.3 124.5 77.8 0.9 1.9 67.1 121.3 9.3 40.4 0.8 2.0
1.84 0.82 1.12 0.60 0.05 0.12 1.36 1.28 0.22 0.53 0.05 0.14
189.4 67.3 − − 102.5 64.6 66.9 78.3 84 110.4 46.2 61.2
13.6 − − − 65.2 21.9 7.9 19.7 18.7 9.8 6.8 5.0
0.07 − − − 0.64 0.34 0.12 0.25 0.22 0.09 0.15 0.08
27.2 20.4 21.2 33.7 23.8 13.1 19.0 20.2 22.6 24.0 13.3 13.0
27.9 14.2 6.4 17.6 11.2 3.5 7.8 2.3 4.1 2.6 1.4 0.8
1.03 0.70 0.30 0.52 0.47 0.26 0.41 0.12 0.18 0.11 0.10 0.06
© 2014 American Chemical Society
A
DOI: 10.1021/acs.analchem.5b03915 Anal. Chem. XXXX, XXX, XXX−XXX
