Strategic Design of Hemi‐Isoindigo Polymer for a Highly Sensitive and Selective All‐Printed Flexible Nitrogen Dioxide Chemiresistive Sensor
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Bibliographic record
Abstract
Abstract The study has developed two hemi‐isoindigo (HID)‐based polymers for printed flexible resistor‐type nitrogen oxide (NO 2 ) sensors: poly[2‐ethylhexyl 3‐((3′“,4′‐bis(dodecyloxy)‐3,4‐dimethoxy‐[2,2′:5′,2′”‐terthiophen]‐5‐yl)methylene)‐2‐oxoindoline‐1‐carboxylate] ( P1 ) and poly[2‐ethylhexyl 2‐oxo‐3‐((3,3′“,4,4′‐tetrakis(dodecyloxy)‐[2,2′:5′,2′”‐terthiophen]‐5‐yl)methylene)indoline‐1‐carboxylate] ( P2 ). These polymers feature thermally removable carbamate side chains on the HID units, providing solubility and creating molecular cavities after thermal annealing. These cavities enhance NO 2 diffusion, and the liberated unsubstituted amide ─C(═O)NH─ groups readily form robust double hydrogen bonds (DHB), as demonstrated by computer simulations. Furthermore, both polymers possess elevated highest occupied molecular orbital (HOMO) energy levels of −4.74 and −4.77 eV, making them highly susceptible to p‐doping by NO 2 . Gas sensors fabricated from P1 and P2 films, anneal under optimized conditions to partially remove carbamate side chains, exhibit remarkable sensitivities of +1400% ppm −1 and +3844% ppm −1 , and low detection limit (LOD) values of 514 ppb and 38.9 ppb toward NO 2 , respectively. These sensors also demonstrate excellent selectivity for NO 2 over other gases.
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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) | 0.001 | 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) | 0.000 | 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 it