A Second Harmonic Generation Study of a Physisorbed Precursor to the Electrodeposition of a Monolayer of Alkanethiols
Bibliographic record
Abstract
Physisorbed thiolates are found to be precursors in the oxidative chemisorption of hexadecanethiolates. In alkaline electrolyte solution, the physisorbed species undergo a slow, nonelectrochemical, reaction that shifts their oxidative adsorption to more positive potentials. This reaction, which makes the formation of a self-assembled monolayer more difficult, was monitored using second harmonic generation (SHG) spectroscopy. The SHG signal is found to be constant for the first 3 min that the thiolates are physisorbed. After this induction period, there is a slow decrease of the SHG signal that lasts 15 min. The magnitude of the SHG decrease is a function of the applied potential. A larger decrease is observed when the potential is close to the hydrogen evolution region. These results suggest that the reaction is a protonation of the physisorbed thiolates via a reaction with adsorbed hydrogen atoms. We also compare the electrodeposition of alkanethiolates with the adsorption of alkanethiols in absence of an applied electric field.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".