Conductive probe AFM study of Pt-thiol and Au-thiol contacts in metal-molecule-metal systems
Bibliographic record
Abstract
The charge transport mechanism between 1,8-octanedithiol (ODT, C(8)H(16)S(2)H(2)) and platinum and gold electrodes is studied by breaking bonds between single ODT molecules and atomic metal junctions using conductive probe atomic force microscopy. Histograms of conductance values show peaks that are obscured by background processes that differ from the metal-molecule-metal conduction path of interest. We introduce a new method to reduce greatly such backgrounds by dividing by a 1-octanethiol (OMT, C(8)H(17)SH) reference histogram, without data selection. The method reveals three series of conductance values for both platinum and gold contacts, which we associate with geometrically different configurations between thiol and metal atoms. The ordering of conductance values, Pt-ODT-Pt > Pt-ODT-Au> Au-ODT-Au, is consistent with a relative dependence on both the number of electron channels and the density of states.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".