Abstract
The interfacial electrochemical properties of self-assembled monolayers (SAMs) on gold derived from a structurally tailored series of monodentate, bidentate, and tridentate chelating alkanethiols were investigated.Specific adsorbates included 1-hexadecanethiol (C16), 2-tetradecylpropane-1,3-dithiol (C16C2), 2-tetradecyl-2-methylpropane-1,3-dithiol (C16C3), 2,2- ditetradecylpropane-1,3-dithiol (C16C16), and 1,1,1-tris(mercaptomethyl) pentadecane (t-C16). Reductive desorption of the SAMs as a function of potential was probed by voltammetric measurements, which indicated the following relative order of electric potential stability: t-C16 > C16C2=C16C3=C16C16 > C16. The ionic permeability was investigated under various applied cathodic potentials by electrochemical impedance spectroscopy (EIS). An examination of SAMs prepared at room temperature and accessed by EIS at open-circuit potential showed that the ionic permeability increased in the order C16C2 > C16 > C16C3 > C16C16 > t-C16. The ionic permeability of films was further influenced by the electric potential of the metal substrate and the temperature at which the monolayers were assembled. The potential dependence of the ionic permeability was qualitatively rationalized by considering both the initial ionic permeability and the electric potential stability of the SAMs. Similarly, the ionic permeability of the SAMs prepared at elevated temperature showed contributions from both their thermal stability and their insulating properties at room temperature.
| Original language | English |
|---|---|
| Pages (from-to) | 3717-3725 |
| Number of pages | 9 |
| Journal | Journal of Physical Chemistry C |
| Volume | 113 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2009 Mar 5 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Surfaces, Coatings and Films
- Physical and Theoretical Chemistry
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Electric potential stability and ionic permeability of SAMs on gold derived from bidentate and tridentate chelating alkanethiols. / Wang, Wei; Zhang, Shishan; Chinwangso, Pawilai; Advincula, Rigoberto C.; Lee, T. Randall.
In: Journal of Physical Chemistry C, Vol. 113, No. 9, 05.03.2009, p. 3717-3725.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Electric potential stability and ionic permeability of SAMs on gold derived from bidentate and tridentate chelating alkanethiols
AU - Wang, Wei
AU - Zhang, Shishan
AU - Chinwangso, Pawilai
AU - Advincula, Rigoberto C.
AU - Lee, T. Randall
PY - 2009/3/5
Y1 - 2009/3/5
N2 - The interfacial electrochemical properties of self-assembled monolayers (SAMs) on gold derived from a structurally tailored series of monodentate, bidentate, and tridentate chelating alkanethiols were investigated.Specific adsorbates included 1-hexadecanethiol (C16), 2-tetradecylpropane-1,3-dithiol (C16C2), 2-tetradecyl-2-methylpropane-1,3-dithiol (C16C3), 2,2- ditetradecylpropane-1,3-dithiol (C16C16), and 1,1,1-tris(mercaptomethyl) pentadecane (t-C16). Reductive desorption of the SAMs as a function of potential was probed by voltammetric measurements, which indicated the following relative order of electric potential stability: t-C16 > C16C2=C16C3=C16C16 > C16. The ionic permeability was investigated under various applied cathodic potentials by electrochemical impedance spectroscopy (EIS). An examination of SAMs prepared at room temperature and accessed by EIS at open-circuit potential showed that the ionic permeability increased in the order C16C2 > C16 > C16C3 > C16C16 > t-C16. The ionic permeability of films was further influenced by the electric potential of the metal substrate and the temperature at which the monolayers were assembled. The potential dependence of the ionic permeability was qualitatively rationalized by considering both the initial ionic permeability and the electric potential stability of the SAMs. Similarly, the ionic permeability of the SAMs prepared at elevated temperature showed contributions from both their thermal stability and their insulating properties at room temperature.
AB - The interfacial electrochemical properties of self-assembled monolayers (SAMs) on gold derived from a structurally tailored series of monodentate, bidentate, and tridentate chelating alkanethiols were investigated.Specific adsorbates included 1-hexadecanethiol (C16), 2-tetradecylpropane-1,3-dithiol (C16C2), 2-tetradecyl-2-methylpropane-1,3-dithiol (C16C3), 2,2- ditetradecylpropane-1,3-dithiol (C16C16), and 1,1,1-tris(mercaptomethyl) pentadecane (t-C16). Reductive desorption of the SAMs as a function of potential was probed by voltammetric measurements, which indicated the following relative order of electric potential stability: t-C16 > C16C2=C16C3=C16C16 > C16. The ionic permeability was investigated under various applied cathodic potentials by electrochemical impedance spectroscopy (EIS). An examination of SAMs prepared at room temperature and accessed by EIS at open-circuit potential showed that the ionic permeability increased in the order C16C2 > C16 > C16C3 > C16C16 > t-C16. The ionic permeability of films was further influenced by the electric potential of the metal substrate and the temperature at which the monolayers were assembled. The potential dependence of the ionic permeability was qualitatively rationalized by considering both the initial ionic permeability and the electric potential stability of the SAMs. Similarly, the ionic permeability of the SAMs prepared at elevated temperature showed contributions from both their thermal stability and their insulating properties at room temperature.
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U2 - 10.1021/jp808957r
DO - 10.1021/jp808957r
M3 - Article
AN - SCOPUS:65249137055
VL - 113
SP - 3717
EP - 3725
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 9
ER -