Cationic and Anionic Surface Binding Sites on Nanocrystalline Zinc Oxide: Surface Influence on Photoluminescence and Photocatalysis
Bibliographic record
Abstract
To probe the influence of the surface on the overall nature of zinc oxide nanocrystals (ZnO NCs) this paper examines the effects of surface modifiers: cobalt Co(II) and trimethylsilanolate, on the properties of ZnO NCs. A clear relationship between the surface, photocatalytic (PC), and photoluminescent (PL) character of ZnO is observed. With potassium trimethylsilanolate and cobalt(II) acetate we have determined that anionic binding sites occupied by silanolate contribute to 40% of the PL character of the defect emission (500-550 nm). Photodegradation of 4-nitrophenol was used as a probe to evaluate the effect of surface modification on the PC performance of ZnO NCs. At maximum silanolate modification the PC activity of ZnO was reduced by 50%. Modification of ZnO NCs with Co(II) resulted in the transfer of photoexcited electrons to the cobalt center where consequent nonradiative recombination, at energies lower than required for PC, was observed via a comparable decrease in both PL and PC activity. These results are critical for using ZnO NCs in sensory, photocatalytic, and electronic applications.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".