Enhanced Sub-ppm NH3 Gas Sensing Performance of PANI/TiO2 Nanocomposites at Room Temperature

Zhu, Chonghui; Cheng, Xiaoli; Dong, Xin; Xu, Ying

doi:10.3389/fchem.2018.00493

Cited by 36 publications

(18 citation statements)

References 27 publications

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“…The response time (defined as the time for reaching 90% of the full response of the sensor after the gas sensor is exposed to target gas) of gas sensor with m (TiO 2 )/m (Ani) = 2 to 50 ppm NH 3 gas is about 26 s, and the recovery time (defined as the time for falling to 10% of the maximum response after the target gas gets out) is 142 s. It is found that the addition of TiO 2 nanoparticles almost has no effect on the response or recovery time of the gas sensors, even so the sensor response is obviously improved. In Table 2, the gas-sensing properties of the PANI/TiO 2 composites are compared with the reported gas sensors in recent publications [22,35,36,37,38,39]. The results show that the gas sensor prepared by a liquid–gas interfacial self-assembly method at m (TiO 2 )/m (Ani) = 2 exhibits excellent sensor response and low response time to NH 3 gas at room temperature.…”

Section: Resultsmentioning

confidence: 94%

Facile Synthesis of the Composites of Polyaniline and TiO2 Nanoparticles Using Self-Assembly Method and Their Application in Gas Sensing

et al. 2019

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The composites of polyaniline and TiO2 nanoparticles with different contents were prepared in the aqueous solution of phosphoric acid, in which the phosphoric acid was selected as the protonic acid to improve the conductivity of polyaniline. In the composites, the TiO2 nanoparticles with the size of about 20 nm were coated by a layer of polyaniline film with a thickness of about 5 nm. Then, the gas sensors were constructed by a liquid–gas interfacial self-assembly method. The gas-sensing properties of the composites-based gas sensors obviously improved after doping with TiO2 nanoparticles, and the sensor response of the composites increased several times to NH3 from 10 ppm to 50 ppm than that of pure polyaniline. Especially when the mass ratio of TiO2 to aniline monomer was 2, it exhibited the best gas response (about 11.2–50 ppm NH3), repeatability and good selectivity to NH3 at room temperature. The p–n junction structure consisting of the polyaniline and TiO2 nanoparticles played an important role in improving gas-sensing properties. This paper will provide a method to improve the gas-sensing properties of polyaniline and optimum doping proportion of TiO2 nanoparticles.

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Section: Resultsmentioning

confidence: 94%

Facile Synthesis of the Composites of Polyaniline and TiO2 Nanoparticles Using Self-Assembly Method and Their Application in Gas Sensing

et al. 2019

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“…Since the beginning of this century, the gas sensing of some polyaniline hybrid materials has been reported. These hybrid materials include NO 2 and triethylamine with SnO 2 -ZnO/PANI [ 6 , 7 ], H 2 S, CO, NH 3 , and volatile organic compounds with PANI/SnO 2 [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ], E. coli bacteria, acetone, ammonia, ethanol, and CO with PANI/TiO 2 [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ], and NH 3 with PANI/MoO 3 and PANI/nano-In 2 O 3 [ 25 , 26 , 27 , 28 ]. Recently, numerous studies have been reported on the benzene gas sensing behavior of these hybrids such as polyaniline/graphene [ 29 , 30 ]; however, reports on the detection of benzene gases at low concentrations are limited.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Gas Sensing Properties of PANI/SnO2 Hybrid Material

et al. 2021

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A sensor operating at room temperature has low power consumption and is beneficial for the detection of environmental pollutants such as ammonia and benzene vapor. In this study, polyaniline (PANI) is made from aniline under acidic conditions by chemical oxidative polymerization and doped with tin dioxide (SnO2) at a specific percentage. The PANI/SnO2 hybrid material obtained is then ground at room temperature. The results of scanning electron microscopy show that the prepared powder comprises nanoscale particles and has good dispersibility, which is conducive to gas adsorption. The thermal decomposition temperature of the powder and its stability are measured using a differential thermo gravimetric analyzer. At 20 °C, the ammonia gas and benzene vapor gas sensing of the PANI/SnO2 hybrid material was tested at concentrations of between 1 and 7 ppm of ammonia and between 0.4 and 90 ppm of benzene vapor. The tests show that the response sensitivities to ammonia and benzene vapor are essentially linear. The sensing mechanisms of the PANI/SnO2 hybrid material to ammonia and benzene vapors were analyzed. The results demonstrate that doped SnO2 significantly affects the sensitivity, response time, and recovery time of the PANI material.

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“…4-c and d, PANI: Borophene sensor has higher sensitivity than PANI and borophene sensors since borophene improves the NH 3 detection performance of PANI. In comparison with the previous reported NH 3 sensors, the prepared Borophene sensor detected trace-level NH 3 gas at room temperature [48][49][50][51][52][53][54][55][56][57].…”

Section: Resultsmentioning

confidence: 90%

“…On the other hand, Kumara et al [48] reported 25 ppm NH 3 gas detection with 213 s response time at room temperature by PANI sensors. For detecting NH 3 gas, PANI/TiO 2 nanocomposite-based sensors have been prepared by several research group [49][50][51][52][53][54]. The produced sensors generally detected NH 3 gas in the range of 20 ppm − 45 ppb above the room temperature in 1-2 min.…”

Section: Introductionmentioning

confidence: 99%

β12 Phase Borophene Enhanced PANI Gas Sensor for CO and NH3 Detection

Taşaltın¹,

Taşaltın²,

Baytemir³

et al. 2021

Preprint

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In cases where the carbon monoxide concentration reaches to 50 ppm, and ammonia concentration reaches to 25 ppm in indoor ambient, the symptoms such as lung failure, heart failure, brain damage are present, and urgent medical attention is required. Therefore, the development of a rapid and sensitive sensor in order to detect the level of CO and NH3 gases is the critical issue for health and the environment. In this study, borophene nanosheets with the β12 phased crystalline structure are produced by ultrasonic sonication. Using borophene nanosheets, Borophene and PANI: Borophene sensors are fabricated to investigate the CO and NH3 gas detection at room temperature. It has been observed that borophene enhances the CO and NH3 gas detection performance of PANI. The results reveal that borophene sensor detected 6 ppm CO gas with 30 s response time and 40 s recovery time, and 50 ppb NH3 gas with 40 s response time and 60 s recovery time at room temperature. On the other hand, PANI: Borophene sensor detected 6 ppm CO gas with 300 s response time and 320 s recovery time and 50 ppb NH3 gas with 100 s response time and 120 s recovery time at room temperature.

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Enhanced Sub-ppm NH3 Gas Sensing Performance of PANI/TiO2 Nanocomposites at Room Temperature

Cited by 36 publications

References 27 publications

Facile Synthesis of the Composites of Polyaniline and TiO2 Nanoparticles Using Self-Assembly Method and Their Application in Gas Sensing

Facile Synthesis of the Composites of Polyaniline and TiO2 Nanoparticles Using Self-Assembly Method and Their Application in Gas Sensing

Preparation and Gas Sensing Properties of PANI/SnO2 Hybrid Material

β12 Phase Borophene Enhanced PANI Gas Sensor for CO and NH3 Detection

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