Enrichment of 1.0 Nanometer Diameter Single-Chirality Single-Walled Carbon Nanotubes Dictated by Conjugated Polymer Characteristics: Implications for High-Performance Thin-Film Transistors
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide In conjugated polymer extraction (CPE), the polymer characteristics impact the chiral selectivity and yield in the enrichment of single-chirality, single-walled carbon nanotubes (SWCNTs). Polyfluorene is one of the most efficient conjugated polymers to enrich semiconducting or single-chirality SWCNTs. We found that copolymers of fluorene and pyridine (PF12-Py2,5) or oxadiazole (P(F 4 -alt-Ox)) exhibited a prevailing selectivity toward (8,7) (diameter 1.032 nm). The chiral purity of (8,7) was improved by storage and ultracentrifugation. In addition, p -xylene is better than toluene to achieve a higher selectivity; as a result, 66% (8,7) purity was reached in p -xylene. Furthermore, the length of the alkyl side chain in PF-Py2,5 also influences the selectivity, with the medium length ( n -dodecylfluorene, PF12-Py2,5) showing higher (8,7) selectivity than a shorter length ( n -octylfluorene, PF8-Py2,5) and a longer length ( n -tetradecylfluorene, PF14-Py2,5). Besides, copolymers of fluorene and benzothiadiazole (PFO-BT) and anthracene (PFO=A) enriched (10,5) (diameter 1.050 nm) in p -xylene and (9,5) (diameter 0.976 nm) in toluene with their chiral purity up to 94.5% and 86%, respectively. The chiral purity was calculated based on the area percentage of the optical absorption S 11 peak and also evaluated by photoluminescence excitation (PLE) mapping and Raman scattering spectroscopy. All three (n,m) achieved the highest purity within the CPE methodology. The quality of enriched (8,7) was examined by the performance of thin-film transistors (TFT), which exhibited hole and electron mobilities of 2.6 ± 0.7 and 1.5 ± 0.6 cm 2 /(V s), respectively, and high on/off ratios of ∼10 4 . 1.0 nm diameter was suggested to reach balanced drive current and leakage in high-performance TFTs. Density functional theory calculation shows that polyfluorene exhibits increasing wrapping stability as the tube diameter increases, and the geometric model of polymer wrapping suggests that P(F 4 -alt-Ox) has better coverage of nanotube surface toward (8,7).
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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".