1. Date of download: 10/23/2017
Copyright © ASME. All rights reserved.
From: Study of Insulating Properties of Alkanethiol Self-Assembled Monolayers Formed Under Prolonged Incubation Using Electrochemical Impedance Spectroscopy
J. Nanotechnol. Eng. Med. 2013;3(3): doi: /
Figure Legend:
AFM measurement of bare gold substrate obtained in intermittent contact mode. The scan area shown is 1 μm by 1 μm.

2. Date of download: 10/23/2017
Copyright © ASME. All rights reserved.
From: Study of Insulating Properties of Alkanethiol Self-Assembled Monolayers Formed Under Prolonged Incubation Using Electrochemical Impedance Spectroscopy
J. Nanotechnol. Eng. Med. 2013;3(3): doi: /
Figure Legend:
Cyclic voltammograms of a bare polycrystalline gold surface scanned (▾) and an Au substrate with a “defect- free” thiol monolayer (▪), which was grown for 5 days. The supporting electrolyte used was 10 mM (I = 0.0316 M) phosphate buffer solution, pH 7, and scan rate 1 V s−1.

3. Date of download: 10/23/2017
Copyright © ASME. All rights reserved.
From: Study of Insulating Properties of Alkanethiol Self-Assembled Monolayers Formed Under Prolonged Incubation Using Electrochemical Impedance Spectroscopy
J. Nanotechnol. Eng. Med. 2013;3(3): doi: /
Figure Legend:
Plot of phase shift at 1 Hz from EIS measurements performed at voltages ranging from −0.3 V to 0.5 V (versus Ag/AgCl)

4. Date of download: 10/23/2017
Copyright © ASME. All rights reserved.
From: Study of Insulating Properties of Alkanethiol Self-Assembled Monolayers Formed Under Prolonged Incubation Using Electrochemical Impedance Spectroscopy
J. Nanotechnol. Eng. Med. 2013;3(3): doi: /
Figure Legend:
Plot of model data (CPE and α) obtained from fitting the EIS data for various incubation times. The dc potential was varied from −0.3 V (versus Ag/AgCl) to 0.5 V. For immersion times shorter than 120 h, the CPE model did not hold over the full dc potential range due to ion penetration.

5. Date of download: 10/23/2017
Copyright © ASME. All rights reserved.
From: Study of Insulating Properties of Alkanethiol Self-Assembled Monolayers Formed Under Prolonged Incubation Using Electrochemical Impedance Spectroscopy
J. Nanotechnol. Eng. Med. 2013;3(3): doi: /
Figure Legend:
Bode plot of undecanethiol applied at 0 V (versus Ag/AgCl) for different incubation times

6. Date of download: 10/23/2017
Copyright © ASME. All rights reserved.
From: Study of Insulating Properties of Alkanethiol Self-Assembled Monolayers Formed Under Prolonged Incubation Using Electrochemical Impedance Spectroscopy
J. Nanotechnol. Eng. Med. 2013;3(3): doi: /
Figure Legend:
Schematic of alkanethiolate SAM evolution on a gold surface over a range of incubation times

7. Date of download: 10/23/2017
Copyright © ASME. All rights reserved.
From: Study of Insulating Properties of Alkanethiol Self-Assembled Monolayers Formed Under Prolonged Incubation Using Electrochemical Impedance Spectroscopy
J. Nanotechnol. Eng. Med. 2013;3(3): doi: /
Figure Legend:
Equivalent circuits of the thiol monolayer: (a) CPE in series with a solution resistance, indicative of a “defect-free” SAM and (b) an equivalent Randle circuit of an SAM with potential induced defects

8. Date of download: 10/23/2017
Copyright © ASME. All rights reserved.
From: Study of Insulating Properties of Alkanethiol Self-Assembled Monolayers Formed Under Prolonged Incubation Using Electrochemical Impedance Spectroscopy
J. Nanotechnol. Eng. Med. 2013;3(3): doi: /
Figure Legend:
Phase angle plot of undecanethiol SAMs formed at different immersion times, with an applied potential of −0.2 V. The phase angle at low frequencies of the 48-h grown monolayer exhibits a phase angle less than −88 deg, for 1 mM and 10 mM concentrations. The substrate Agonafer 23 immersed in thiol solution for 5 days shows a phase angle of −88 deg, an indication of a monolayer without defects for 1 mM and 10 mM concentrations.