Two-Dimensional Self-Assembled Gold Silicide Honeycomb Nanonetwork on Si(111)7×7
Bibliographic record
Abstract
The growth evolution of Au on Si(111)7×7 at room temperature under ultrahigh vacuum conditions is studied by using scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). Both STM filled-state and empty-state imaging show that on the 7×7 surface two distinct Au layers form one after another, each by connecting patches of adjoining Au clusters, before individual islands start to grow on top. XPS measurements of the same coverages reveal that Au exists as gold silicide in the two interfacial distinct layers and as metallic Au in the islands. The critical thickness of the gold silicide interface region is found to be two monolayers, which marks the transition from layer-by-layer to island growth. These results provide direct observation and chemical-state characterization of Au growth on Si(111)7×7 in the Stranski–Krastanov mode. Of special interest is the formation of the gold silicide honeycomb nanonetwork at 0.76 monolayer coverage, which is made up of six triangular Au clusters (around each corner hole) interconnected to one another at the dimer rows of the Si(111)7×7 substrate. With the corner holes of the 7×7 surface exposed, this new gold silicide nanonetwork, in effect, forms a two-dimensional template of nanopores (∼1 nm in pore size) for molecular trapping application. The gold silicide honeycomb nanonetwork also offers a new conducting phase of fundamental interest to semiconductor device fabrication and to potential applications in biofunctionalization.
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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 | 0.001 |
| 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".