Structure of Dithiothreitol Monolayers on Au(111)
Bibliographic record
Abstract
We have investigated the structure and properties of dithiothreitol (DTT) monolayers adsorbed on Au(111). Using scanning tunneling microscopy (STM), and Auger electron spectroscopy (AES), we have compared the properties of DTT monolayers with those of more conventional octanethiol layers. STM measurements indicate that much of the DTT layer is disordered; however, small ordered regions with local 2√3×√3 symmetry are observed. STM images of octanethiol films exhibit the characteristic close packed √3×√3 molecular layer with c(4×2) supersymmetry. AES indicates sulfur coverage for both the DTT and octanethiol films is similar. AES studies involving Ellman's reagent, a marker species, suggest a significant fraction of the DTT molecules in the adlayer bind to the gold via two Au−S bonds. On the basis of AES and STM measurements, we propose a structural model in which the majority of DTT molecules bind to the gold surface via two Au−S bonds. The distance between the two Au−S bonds is 5.00 Å, or the same √3a spacing observed between close packed alkanethiol molecules.
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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".