Effect of grain boundaries on hydrocarbon sensing in Fe-doped p-type semiconducting perovskite SrTiO3 films
Bibliographic record
Abstract
Films of Fe-doped SrTiO3 deposited using pulsed laser deposition on sapphire and alumina, when exposed to propane, showed different sensor responses measured (as a resistance change) as a function of temperature and microstructure. The film deposited on alumina has a stronger response towards 3000-ppm propane than does the film deposited on sapphire. Films deposited on alumina exhibit higher dc conductivity than the films on sapphire. The activation energies indicate a mixed electronic/ionic conduction at low temperature with the high-temperature regime showing a temperature-independent conductivity. The origin of the difference in gas responses caused by varying temperature and morphology has been explored using ac impedance techniques and measured as a function of frequency (1Hz⩽f⩽1MHz) and temperature (200⩽T⩽480°C). A single relaxation (a single semicircle in the complex impedance plane) in the frequency domain was observed in addition to the relaxation due to the electrode-film interface. A model and a mechanism of conduction for the above are derived using equivalent circuits to fit the ac impedance data and dc conductivity. It is proposed that the reduction of Fe-doped SrTiO3, which is induced by propane, enhances the space-charge barrier near the grain boundaries and increases the sensitivity to propane.
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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".