n-Type boron β-diketone-containing conjugated polymers for high-performance room temperature ammonia sensors

Song, Weichen; Sun, Jiankun; Wang, Qian; Wu, Han; Zheng, Kunpeng; Wang, Binbin; Wang, Zhong; Long, Xiaojing

doi:10.1039/d3mh01596c

Mater. Horiz.

2024

DOI: 10.1039/d3mh01596c

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n-Type boron β-diketone-containing conjugated polymers for high-performance room temperature ammonia sensors

Weichen Song,

Jiankun Sun,

Qian Wang

et al.

Abstract: A novel strategy to modulate the charge distribution of active centers on ammonia sensing materials is reported. Boron β-diketone can effectively modulate surface electronic states, identifying the electron-deficient B ← O units as active centers.

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Cited by 3 publications

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High‐Performance Room Temperature Ammonia Sensors Based on Pure Organic Molecules Featuring B‐N Covalent Bond

Wang,

Zheng

et al. 2024

Advanced Science

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Exploring organic semiconductor gas sensors with high sensitivity and selectivity is crucial for the development of sensor technology. Herein, for the first time, a promising chemiresistive organic polymer P‐BNT based on a novel π‐conjugated triarylboron building block is reported, showcasing an excellent responsivity over 30 000 (Ra/Rg) against 40 ppm of NH3, which is ≈3300 times higher than that of its B‐N organic small molecule BN‐H. More importantly, a molecular induction strategy to weaken the bond dissociation energy between polymer and NH3 caused by strong acid‐base interaction is further executed to optimize the response and recovery time. As a result, the BN‐H/P‐BNT system with rapid response and recovery times can still exhibit a high responsivity of 718, which is among the highest reported NH3 chemiresistive sensors. Supported by in situ FTIR spectroscopy and theoretical calculations, it is revealed that the N‐H fractions in BN‐H small molecule promoted the charge distribution on phenyl groups, which increases charge delocalization and is more conducive to gas adsorption in such molecular systems. Notably, these distinctive small molecules also promoted charge transfer and enhanced electron concentration of the P‐BNT sensing polymer, thus achieving superior B‐N‐containing organic molecules with excellent sensing performance.

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High‐Performance Room Temperature Ammonia Sensors Based on Pure Organic Molecules Featuring B‐N Covalent Bond

Wang,

Zheng

et al. 2024

Advanced Science

Self Cite

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Electron‐Deficient Organic Molecules Based on B←N Unit: A N‐Type Room‐Temperature Chemiresistive Sensors with Moisture Resistance

Wang,

Xing,

Zhang

et al. 2024

Advanced Science

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Organic molecules with tailorable chemical structures, high stability, and solution processability have great potential in the sensing field. Compared with p‐type organic small molecules (OSMs), the electron‐dominated n‐type analogs show superior conductivity when exposed to reducing gases, which can achieve outstanding sensor signal‐to‐noise ratios. However, inadequate humidity resistance at room temperature hinders the development of such molecules. Herein, an A‐D‐π‐D‐A molecular design strategy is proposed based on electron‐deficient B←N units, which results in effective intramolecular charge transport and sensitive responses by extending the π‐conjugation bridge. As a result, the ST‐2BP with A‐D‐π‐D‐A configuration shows a prominent sensitivity of 787 (Ra/Rg) in 20 ppm NH3 at room temperature and an almost initial and stable response under different relative humidity conditions, which is the highest among currently reported OSM sensors. Supported by theoretical calculations and in situ FTIR spectra, it is revealed that B←N units, which function as the active centers mediate the specific ammonia adsorption. This study provides a new understanding of the design of high‐performance room temperature gas sensing materials by decorating B←N units.

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Study on four pyridine-based difluoroboron compounds for mechanofluorochromic behaviors, the ink-free writing and detection of latent fingerprints

Tan,

Tian,

Yang

et al. 2024

Journal of Luminescence

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n-Type boron β-diketone-containing conjugated polymers for high-performance room temperature ammonia sensors

Abstract: A novel strategy to modulate the charge distribution of active centers on ammonia sensing materials is reported. Boron β-diketone can effectively modulate surface electronic states, identifying the electron-deficient B ← O units as active centers.

Cited by 3 publications

References 50 publications

High‐Performance Room Temperature Ammonia Sensors Based on Pure Organic Molecules Featuring B‐N Covalent Bond

High‐Performance Room Temperature Ammonia Sensors Based on Pure Organic Molecules Featuring B‐N Covalent Bond

Electron‐Deficient Organic Molecules Based on B←N Unit: A N‐Type Room‐Temperature Chemiresistive Sensors with Moisture Resistance

Study on four pyridine-based difluoroboron compounds for mechanofluorochromic behaviors, the ink-free writing and detection of latent fingerprints

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