Metal to Insulator Transition in Films of Molecularly Linked Gold Nanoparticles
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Bibliographic record
Abstract
We report a metal to insulator transition (MIT) in disordered films of molecularly linked gold nanoparticles (NPs). As the number of carbons ($n$) of alkanedithiol linker molecules (${\mathrm{C}}_{n}{\mathrm{S}}_{2}$) is varied, resistance ($R$) at low temperature ($T=2\text{ }\text{ }\mathrm{K}$) and at 200 K, as well as trends in $R$ vs $T$ data at intermediate temperatures, all point to an MIT occurring at $n=5$. We describe these results in a context of a Mott-Hubbard MIT. We find that all insulating samples ($n\ensuremath{\ge}5$) exhibit a universal scaling behavior $R\ensuremath{\sim}\mathrm{exp}[({T}_{0}/T{)}^{\ensuremath{\nu}}]$ with $\ensuremath{\nu}=0.65$, and all metallic samples ($n\ensuremath{\le}5$) exhibit weaker $R\mathrm{\text{\ensuremath{-}}}T$ dependencies than bulk gold. We discuss these observations in terms of competitive thermally activated processes and strong, $T$-independent elastic scattering, respectively.
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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 it