The Effect of Dispersion Media on Photoluminescence of Colloidal CdSe Nanocrystals Synthesized from TOP
Bibliographic record
Abstract
The media used for dispersion have a significant effect on the photoluminescent (PL) efficiency of colloidal CdSe nanocrystals, in addition to synthetic parameters. The investigated dispersion media were water-insoluble hexanes (Hex), toluene (Tol), chloroform (CHCl 3 ), and water-miscible tetrahydrofuran (THF); in addition, a water−THF mixture (25%, weight), a tri- n -octylphosphine (TOP)−Hex mixture (25%, weight), and a TOP−THF mixture (25%, weight) were also explored as dispersion media. Solvent-dependent equilibriums affect the number of surface-adsorbed molecules available for surface passivation and the removal of surface ligands, with both concentration and additives (such as TOP) and time playing a role, so that PL intensities can either be enhanced or diminished depending on the detailed conditions. Moreover, an enhancement is not possible at low concentrations of nanocrystals after days of storage, as dissociation of the surface ligands plays a major role and leads to the formation of the other fluorescent species causing baseline uprising. The colloidal CdSe nanocrystals used were synthesized in a reaction medium consisting of tri- n -octylphosphine (TOP), with cadium oxide (CdO) as the Cd precursor and TOPSe as the Se source.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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".