Achieving high response of poly (3-hexylthiophene-2,5-diyl) molecules to gaseous ammonia using anodic aluminum oxide nanoporous substrate operated under 1 V

Biring, Sajal; Bakash, K Rahim

doi:10.1016/j.snb.2022.132712

Cited by 8 publications

(6 citation statements)

References 46 publications

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“…According to IUPAC, the sensitivity of the sensor is defined as the change in response (R) with respect to the H 2 S concentrations (c). 54 = R c sensitivity d d…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Achieving Room-Temperature ppb-Level H₂S Detection in a Au-SnO₂ Sensor with Low Voltage Enhancement Effect

Deb,

Lu,

Zan

2024

ACS Sens.

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Although semiconductor metal oxide-based sensors are promising for gas sensing, low-power and room temperature operation (24 ± 1 °C) remains desirable for practical applications particularly considering the request of energy saving or net zero emission. In this study, we demonstrate a Au/SnO 2 -based ultrasensitive H 2 S gas sensor with a limit of detection (LOD) of 2 ppb, operating at very low voltages (0.05 to 0.5 V) at room temperature. The Au/SnO 2 -based sensor showed approximately 7 times higher response (the ratio of change in the current to initial current) of ∼270% and 4 times faster recovery (126 s) compared to the pure SnO 2 -based sensor when exposed to 500 ppb H 2 S gas concentration at 0.5 V operating voltage at relative humidity (RH) 17.5 ± 2.5%. The enhancement can be attributed to the catalytic characteristics of AuNPs, increasing the number of adsorbed oxygen species on sensing material surfaces. Additionally, AuNPs aid in forming flower-petal-like Au/SnO 2 nanostructures, offering a larger surface area and more active sites for H 2 S sensing. Moreover, at low voltage (<1 V), the localized dipoles at the Au/SnO 2 interface may further enhance the absorption of polar oxygen molecules and hence promote the reaction between H 2 S and oxygen species. This low-power, ultrasensitive H 2 S sensor outperforms high-powered alternatives, making it ideal for environmental, food safety, and healthcare applications.

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“…According to IUPAC, the sensitivity of the sensor is defined as the change in response (R) with respect to the H 2 S concentrations (c). 54 = R c sensitivity d d…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…On the other hand, sensitivity is an important parameter of the sensor, which can determine the applicability of the sensor by indicating the sensitive zone. According to IUPAC, the sensitivity of the sensor is defined as the change in response ( R ) with respect to the H 2 S concentrations ( c ) sensitivity = normald R normald c …”

Section: Resultsmentioning

confidence: 99%

Achieving Room-Temperature ppb-Level H₂S Detection in a Au-SnO₂ Sensor with Low Voltage Enhancement Effect

Deb,

Lu,

Zan

2024

ACS Sens.

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“…[ 10 ] Lu and co‐workers designed a squaraine of resonance‐stabilized zwitterionic structure to detect NH 3 , achieving a lower detection limit while maintaining fast response/recovery and good stability. [ 11 ] In addition, sensing materials such as highly oriented PPy nanotubes, [ 12 ] polythiophene (PTh) films, [ 13 ] and polyimide materials [ 14 ] were also employed to gain low detection limit and fast response to NH 3 . However, the accurate design of ammonia sensing materials with high response values is still a great challenge, thus limiting the development of sensors.…”

Section: Introductionmentioning

confidence: 99%

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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“…Poly(3-hexylthiophene) (P3HT), a derivative of PT, is a notable candidate among a range of CPs due to its exceptional chemical stability and remarkable sensitivity towards NH 3 molecules. [26,27] The potential of P3HT films for NH 3 gas sensing at room temperature was demonstrated in a pioneering study conducted by A. Assadi et al in 1990. [28] Nevertheless, pristine P3HT NH 3 sensors exhibit certain limitations, such as a diminished response, delayed reaction recovery time, notable baseline drift, and various other challenges.…”

Section: Introductionmentioning

confidence: 99%

Poly3‐Hexylthiophene Titanium Dioxide (P3HT‐TiO₂) Composite Sensor for High Response Detection of Ammonia at Room Temperature

Fei,

Nie,

Ding

et al. 2024

ChemNanoMat

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Gas sensors for ammonia (NH3) play a crucial role in the maintenance of air quality, preservation of the atmosphere, and evaluation of human health. However, the endeavor to attain a high level of sensitivity in detecting NH3 under ambient conditions remains a challenging task. In this work, poly(3‐hexylthiophene)s and titanium dioxide (P3HT‐TiO2) heterostructure NH3 gas‐sensitive material was prepared, and by drop‐casting the material onto a substrate with Au interdigital electrodes, a sensor for high‐response detection of NH3 at room temperature was constructed. The designed gas sensor exhibited a high response signal of 114.61% toward 15 ppm NH3 at room temperature (25°C) with good reproducibility, strong long‐term stability, and excellent selectivity. Moreover, by analyzing the response law of the sensor under different humidity conditions, it has been noted that both excessively high and excessively low levels of humidity adversely affect the sensor’s response. The remarkable increase in NH3 sensing properties is attributed to the synergistic enhancement effect of P‐N heterojunction formed between P3HT and TiO2. This NH3 gas sensor exhibits tremendous potential for use due to its straightforward structure and outstanding ammonia sensing performance.

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Achieving high response of poly (3-hexylthiophene-2,5-diyl) molecules to gaseous ammonia using anodic aluminum oxide nanoporous substrate operated under 1 V

Cited by 8 publications

References 46 publications

Achieving Room-Temperature ppb-Level H₂S Detection in a Au-SnO₂ Sensor with Low Voltage Enhancement Effect

Achieving Room-Temperature ppb-Level H₂S Detection in a Au-SnO₂ Sensor with Low Voltage Enhancement Effect

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

Poly3‐Hexylthiophene Titanium Dioxide (P3HT‐TiO₂) Composite Sensor for High Response Detection of Ammonia at Room Temperature

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Achieving high response of poly (3-hexylthiophene-2,5-diyl) molecules to gaseous ammonia using anodic aluminum oxide nanoporous substrate operated under 1 V

Cited by 8 publications

References 46 publications

Achieving Room-Temperature ppb-Level H2S Detection in a Au-SnO2 Sensor with Low Voltage Enhancement Effect

Achieving Room-Temperature ppb-Level H2S Detection in a Au-SnO2 Sensor with Low Voltage Enhancement Effect

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

Poly3‐Hexylthiophene Titanium Dioxide (P3HT‐TiO2) Composite Sensor for High Response Detection of Ammonia at Room Temperature

Contact Info

Product

Resources

About

Achieving Room-Temperature ppb-Level H₂S Detection in a Au-SnO₂ Sensor with Low Voltage Enhancement Effect

Achieving Room-Temperature ppb-Level H₂S Detection in a Au-SnO₂ Sensor with Low Voltage Enhancement Effect

Poly3‐Hexylthiophene Titanium Dioxide (P3HT‐TiO₂) Composite Sensor for High Response Detection of Ammonia at Room Temperature