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Chemical structures octanethiol (OT) and 1-naphthalenethiol (1NT), the compounds used in this study.
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A two-dimensional (2D) mixture in the form of a self-assembled monolayer composed of two distinct organothiol compounds was created by sequentially depositing 1-naphthalenethiol (1NT) and octanethiol (OT) on a gold surface. By varying the sequence of deposition, two mixed surface systems were created. The surface structure of the resulting mixed mo...
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... were collected in triplicate, and uncertainties represent the standard deviation of the measured values. Figure 1 shows the chemical structures of the compounds investigated in this study. OT has a length of 8.06 Å, and 1NT has a length of 6.8 Å from the outer edge of one benzene ring to the outer edge of its neighboring benzene ring. ...
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... Spectra of Binary OT/1NT and 1NT/OT SAMs. Binary monolayers produced spectra with similar binding energies for the C 1s peak, Figure 10a−b. In 1NT/OT binary SAMs, this peak was observed at 284.7 eV. ...
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... There is, however, a marked difference in the S 2p spectra for binary SAMs with opposing deposition sequence. As shown in Figure 10c, in binary SAMs where OT is deposited second (1NT/OT), the S 2p signal is composed only of a doublet centered at 162.0 eV. Conversely, the S 2p signal from OT/ 1NT monolayers has a doublet peak centered at 161.6 eV as well as a peak at 168.4 eV, signifying the presence of oxidized sulfur species in the form of sulfonates within the monolayer, Figure 10d. ...
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... shown in Figure 10c, in binary SAMs where OT is deposited second (1NT/OT), the S 2p signal is composed only of a doublet centered at 162.0 eV. Conversely, the S 2p signal from OT/ 1NT monolayers has a doublet peak centered at 161.6 eV as well as a peak at 168.4 eV, signifying the presence of oxidized sulfur species in the form of sulfonates within the monolayer, Figure 10d. There is also a considerable amount of signal in the region between 163 and 165 eV, signifying physisorbed sulfur species. ...
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... the graphs, the raw data signal is shown in black, the curves used to fit the data are shown in green, and the final fit is shown in red. Figure 10. XP spectra of binary monolayers. ...
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... Journal of Physical Chemistry C pubs.acs.org/JPCC Article molecular layers were analyzed first to understand the fundamental properties of OT and 1-NT, shown in Figure 11a and 11b, respectively. For each molecular layer there is a broad anodic response that can be attributed to oxidative readsorption. ...
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... molecular layer also shows a broad cathodic response around −0.4 to −0.5 V. The broad peak is the least negative peak observed and is also present in control measurements of bare gold surfaces, shown in Figure S1. We therefore attribute the broad peak to desorption of solvent species. ...
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... Reductive desorption measurements of sequential deposition of 1NT followed by OT in Figure 11c reveal three peaks, with a broad peak attributed to the solvent present at a relatively low negative potential. A small peak at −0.99 ± 0.02 V is also present, and the most negative peak is present at −1.18 ± 0.03 V. ...
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... of reductive desorption of sequential deposition of OT followed by 1NT were far less reproducible than the other surfaces measured in this work. One example is shown in Figure 11d with additional examples included in Figure S2. We observe two reproducible prominent peaks, the broad peak attributed to solvent −0.45 ± 0.06 V and a peak at −1.18 ± 0.03 V that has a desorption potential that is indistinguishable from the most negative peaks of the other three molecular layers. ...
