Mechanism of Shape Evolution in Ag Nanoprisms Stabilized by Thiol-Terminated Poly(ethylene glycol): An in Situ Kinetic Study
Bibliographic record
Abstract
Silver nanoprisms are found to undergo a shape transformation from triangular to disk-like upon functionalization with thiol-terminated poly(ethylene glycol) (PEG-SH). The shape transformation starts with a rounding of the nanoprism tips followed by a reduction in the overall particle size. The changes in nanoparticle morphology and surface chemistry during the PEGylation process are investigated by a combination of transmission electron microscopy, in situ UV–vis spectroscopy, and in situ solution-phase X-ray absorption near-edge structure at the Ag L 3 - and the S K -edge. We found that PEG-SH etches the Ag surface through a catalytic redox process, whereby oxidized surface atoms are first removed from the nanoprism tips (likely as the silver(I) thiolate complex) and then reduced back to elemental silver (in the form of small clusters) in the solution along with oxidation of the thiolate to the disulfide. The effect of PEG-SH concentration and molecular weight are investigated, along with the role of ambient oxygen in the etching process. The results have implications for the behavior of silver nanoprisms in various plasmonic applications (e.g., surface-enhanced Raman scattering and metal-enhanced fluorescence) and also provide insights into the degradation mechanism of silver nanomaterials in the environment.
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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 | 0.001 | 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 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".