Flexible Room Temperature Ammonia Gas Sensor Based on Low-Temperature Tuning of Functional Groups in Grapheme

Sett, Avik; Majumder, Snehamoy; Bhattacharyya, Tarun Kanti

doi:10.1109/ted.2021.3075197

Cited by 26 publications

(7 citation statements)

References 28 publications

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“…The fitting results of both devices show that Langmuir isotherm model correlates well with the adsorption data. As summarized in Figure 5i, both the sensitivity and the response time of the device are among the best among the gas sensors reported thus far with various kinds of active materials, i.e., organic semiconductors, 7,8,12 conducting polymers, 44−46 metal oxides, 47−49 two-dimensional materials, 41,50,51 and metal-organic frameworks. 52−54 The excellent performance of the LLA P3BT thin film-based sensors should be mainly ascribed to the uniform morphology of the active layers.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

High-Performance Flexible Gas Sensors Based on Layer-by-Layer Assembled Polythiophene Thin Films

Tan

Liu

et al. 2021

Chem. Mater.

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Gas sensors using organic semiconductors (OSCs) as active materials possess many advantages, including tunable selectivity and intrinsic flexibility, but still suffer from slow response and limited sensitivity. Ultrathin OSC films with high surface-to-volume ratios can improve the sensing performance; however, fabrication of continuous and uniform ultrathin OSC films using conventional methods remains challenging. In this work, we introduce a layer-by-layer assembly method, which is derived from the concept of atomic/molecular layer deposition technology, to prepare polythiophene OSC films under precise control. The resulting polythiophene film exhibits a linear growth as a function of the deposition cycle, and the nanoscale ultrathin films present a good thickness uniformity and smooth surface, in contrast to the uneven porous structure of spin-coated films. The assembly mechanism is revealed based on the detailed characterization of the polythiophene films. Further, the fabricated gas sensor using the layer-by-layer assembled polythiophene film as an active layer exhibits a 17%/ppm sensitivity to ammonia and a response time of less than 2 s, which is much superior to its counterpart with the spin-coated polythiophene film and is the best performance compared to previous reports. Flexible gas sensors are further demonstrated by depositing the film on a polymer substrate using the abovementioned method. Therefore, this work provides a widely applicable method to precisely deposit ultrathin and uniform OSC films for advanced applications.

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Section: ■ Results and Discussionmentioning

confidence: 98%

High-Performance Flexible Gas Sensors Based on Layer-by-Layer Assembled Polythiophene Thin Films

Tan

Liu

et al. 2021

Chem. Mater.

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“…Consequently, graphene may be a viable competitor to metal oxides in the development for the next generation of resistive gas sensors [13]. However, pure graphene has low adsorption energy due to a lack of oxygen functionalities and defect sites, hence it is not suitable for gas detection [14]. Adding defect sites to the graphene matrix raises the adsorption energy and permits the charge transfer between the matrix and molecules that have been adsorbed [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the fabrication of room temperature operable gas sensors is one of the main areas of research currently being pursued. To date, a large number of RGO-based ammonia gas sensors have been reported [14,[28][29][30]. However, earlier reported research results illustrate that RGO-based devices come with several drawbacks, including low response, high response/recovery time and poor repeatability [14].…”

Section: Introductionmentioning

confidence: 99%

A synergistic approach to enhance sensitivity and selectivity of room temperature operable ammonia gas sensor with humidity assistance using RGO/WO₃ nanocomposite

Tripathi,

Chauhan,

Rawat

2023

Nanotechnology

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In this study, the fabrication of an ultrahigh selective NH3 gas sensor based on RGO/WO3 nanocomposite has been proposed. The hydrothermal method was employed to synthesize the RGO/WO3 nanocomposite. The formation of RGO/WO3 nanocomposite and the elemental composition, structure and morphology of the as-synthesized materials were confirmed through an array of analytical techniques, including XRD, Raman, FT-IR, XPS and TEM. For gas sensing applications, pure RGO and RGO/WO3 have effectively spin-coated onto the interdigitated electrodes (IDE’s) based on fluorine doped tin oxide (FTO) respectively, and their sensitivity towards NH3 was tested. Gas sensing characteristics of prepared materials were analyzed at room temperature (25⁰C) under different relative humidity (RH) levels. The developed RGO/WO3 sensor was subjected to different NH3 concentrations, demonstrating a high sensing response of 89% towards 500 ppm NH3 under 11%―97%―11% RH conditions. Notably, the sensor exhibited rapid response and recovery times with an average response time of 92 s and recovery time of 26 s when exposed to 500 ppm NH3 under the specified RH conditions. To gauge the material selectivity, the prepared nanocomposite was exposed to a range of volatile organic compounds and the results showcased the sensor’s remarkable selectivity and sensitivity specifically toward NH3 vapor. This superior performance can be attributed to the abundant active sites and the excellent electron transport properties inherent to the RGO component. Importantly, the RGO/WO3 sensor displayed high reproducibility and consistent responses, with minimal degradation (1.98% degradation) over 30 days at 11%―97%―11% RH. Furthermore, we examined the sensor’s response with varying levels of relative humidity to assess its potential for real-world applications. The sensor exhibited extremely low power consumption, outperforming a commercially available metal oxide sensor while operating at ambient temperature. The robust performance of RGO/WO3 coupled with low power requirements and ambient temperature operation, positions it as a promising candidate for next-generation gas sensing technologies.

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“…Despite the large number of publications devoted to ammonia sensors, research is far from slowing down. Chemiresistive gas sensors are most often found in recent literature [60], and special materials such as graphene [60,61] and transition metal dichalcogenides [62] are among the most investigated. A quartz crystal resonator was recently employed in series with a PANI coated interdigital electrode [59].…”

Section: Introductionmentioning

confidence: 99%

“…The measurement of frequency brought significant advantages, namely a high shift while the resistance tuning effect was very weak. Ammonia flexible sensors are presently gaining special interest [60][61][62][63][64]. The search for the ideal sensor continues.…”

Section: Introductionmentioning

confidence: 99%

A New Analytical Method to Quantify Ammonia in Freshwater with a Bulk Acoustic Wave Sensor

Antunes

Gomes

2022

Sensors

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A new method to analyse ammonia in freshwater, based on a piezoelectric quartz crystal coated with the metalloporphyrin chloro[5,10,15,20-tetrakis(pentafluorophenyl)porphyrinato] manganese(III) is presented. A 9 MHz quartz crystal coated on both faces with an amount of porphyrin produced a frequency decrease of 21.4 kHz, which allowed ammonia in a 10.00 mL sample to be quantified in concentrations between 5 and 70 µg L−1, with a sensitivity of 0.60 Hz L µg−1, over a period of at least eight months. The proposed method has several advantages over the officially recommended indophenol spectrophotometric method: sample volume was reduced by a factor of 2.5, toxic reagents (phenol and sodium nitroprusside) were eliminated, analysing turbid samples presented no difficulty, and there was not only a significant time saving in solution preparation, but also in sample analysis time, which was reduced from 1 h to 2 min. No statistically significant differences (α = 0.05) were found both in the mean and precision of the results obtained for ammonia in water samples collected from domestic wells, analysed by this new method and by the indophenol spectrophotometric method. Furthermore, the proposed method would allow the individual quantification, with similar sensitivity, of amines and ammonia within a single analytical run.

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Flexible Room Temperature Ammonia Gas Sensor Based on Low-Temperature Tuning of Functional Groups in Grapheme

Cited by 26 publications

References 28 publications

High-Performance Flexible Gas Sensors Based on Layer-by-Layer Assembled Polythiophene Thin Films

High-Performance Flexible Gas Sensors Based on Layer-by-Layer Assembled Polythiophene Thin Films

A synergistic approach to enhance sensitivity and selectivity of room temperature operable ammonia gas sensor with humidity assistance using RGO/WO₃ nanocomposite

A New Analytical Method to Quantify Ammonia in Freshwater with a Bulk Acoustic Wave Sensor

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Flexible Room Temperature Ammonia Gas Sensor Based on Low-Temperature Tuning of Functional Groups in Grapheme

Cited by 26 publications

References 28 publications

High-Performance Flexible Gas Sensors Based on Layer-by-Layer Assembled Polythiophene Thin Films

High-Performance Flexible Gas Sensors Based on Layer-by-Layer Assembled Polythiophene Thin Films

A synergistic approach to enhance sensitivity and selectivity of room temperature operable ammonia gas sensor with humidity assistance using RGO/WO3 nanocomposite

A New Analytical Method to Quantify Ammonia in Freshwater with a Bulk Acoustic Wave Sensor

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A synergistic approach to enhance sensitivity and selectivity of room temperature operable ammonia gas sensor with humidity assistance using RGO/WO₃ nanocomposite