Photochemical Strategies for the Facile Synthesis of Gold−Silver Alloy and Core−Shell Bimetallic Nanoparticles
Bibliographic record
Abstract
The reduction of HAuCl 4 and AgNO 3 in aqueous surfactant solutions by 2-hydroxy-2-propyl radical generated by the photochemical cleavage of 1-[4-(2-hydroxyethoxy)phenyl]-2-hydroxy-2-methyl-1-propane-1-one, commercialized as Irgacure-2959 (I-2959), produces Au−Ag bimetallic nanoparticles with different composition, and architecture,, alloys, and core−shells. The nanoparticle architecture depends on the surfactant employed. The use of hexadecyltrimethylammonium chloride (CTAC) produces Au(core)−Ag(shell) nanoparticles, as expected on the basis of the redox properties of the two metals, whereas when the surfactant is sodium dodecyl sulfate (SDS), it promotes the formation of Au−Ag alloy nanoparticles; the effect is attributed to silver’s Coulombic advantage that compensates for the fact that gold is a “more noble” metal. Both structures are characterized by UV−vis spectroscopy, transmission electron microscopy (TEM) and high-resolution transmission spectroscopy (HR-TEM).
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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".