AI Article Synopsis
- The study focuses on developing two types of hemi-isoindigo-based polymers (P1 and P2) for flexible nitrogen oxide sensors.
- Both polymers utilize thermally removable side chains that create molecular cavities upon heating, which improve nitrogen oxide diffusion and enhance gas detection.
- The sensors made from these polymers show significant sensitivity to NO with detection limits of 514 ppb and 38.9 ppb, while also being highly selective for NO compared to other gases.
Article Abstract
The study has developed two hemi-isoindigo (HID)-based polymers for printed flexible resistor-type nitrogen oxide (NO) 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 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. Gas sensors fabricated from P1 and P2 films, anneal under optimized conditions to partially remove carbamate side chains, exhibit remarkable sensitivities of +1400% ppm and +3844% ppm, and low detection limit (LOD) values of 514 ppb and 38.9 ppb toward NO, respectively. These sensors also demonstrate excellent selectivity for NO over other gases.
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| http://dx.doi.org/10.1002/smtd.202301521 | DOI Listing |
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