PrGO decorated TiO2 nanoplates hybrid nanocomposite for augmented NO2 gas detection with faster gas kinetics under UV light irradiation

Harathi, Nimmala; Bollu, Manoj; Pasupuleti, Kedhareswara Sairam; Tauanov, Zhandos; Peta, Koteswara Rao; Kim, Moon‐Deock; Reddeppa, Maddaka; Sarkar, Angsuman; Rao, Vempuluru Navakoteswara

doi:10.1016/j.snb.2022.131503

Cited by 55 publications

(11 citation statements)

References 43 publications

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“…The signal response of TNT below 0.1 ppm could not be observed due to the limitation of experimental conditions. We used the International Union of Pure Applied Chemistry (IUPAC) standard to calculate the detection limit of the sensor D L normalp normalp normalm = 3 normalR normalM normalS normaln normalo normali normals normale normalS normall normalo normalp normale normalR normalM normalS normaln normalo normali normals normale = ( R i − R f ) 2 N where RMS noise is the root-mean-square of the noise of the sensor in the air and estimated by fitting a fifth-order polynomial.…”

Section: Resultsmentioning

confidence: 99%

“…The signal response of TNT below 0.1 ppm could not be observed due to the limitation of experimental conditions. We used the International Union of Pure Applied Chemistry (IUPAC) standard to calculate the detection limit of the sensor where RMS noise is the root-mean-square of the noise of the sensor in the air and estimated by fitting a fifth-order polynomial.…”

Section: Resultsmentioning

confidence: 99%

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A Composite Gas-Phase Explosives Sensor with Frequency-Resistance Dual-Signal Display Based on Surface Acoustic Wave

Yang

Wang

Zhu

et al. 2023

ACS Appl. Electron. Mater.

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The surface acoustic wave (SAW) technology has been widely used for hazardous gas detection, but the low sensitivity, poor selectivity, long response/recovery time, and signal “false positives” of the sensors have limited its application for gas-phase explosives detection. In this paper, a composite gas-phase explosives sensor with frequency-resistance dual-signal display was designed by transferring 25 layers of graphene (rGO) in the sensing area of the SAW device and coupling p-aminothiophenol (PATP)-modified gold nanoparticles (AuNPs). The rGO:AuNP/PATP-SAW sensor shows signal response from two signal dimensions, frequency and resistance, to 0.1–80 ppm TNT gas with a low detection limit (DL) of 41.2 ppb. The composite sensor has a short response/recovery time (9.8 s/27.1 s) with good selectivity, repeatability, and stability. The excellent gas-sensitive performance of the rGO:AuNP/PATP-SAW sensor was attributed to the fact that PATP provides a large number of selective capture groups, which are enriched in the sensing area by the presence of multiple strong interactions with 2,4,6-trinitrotoluene (TNT) molecules. This work will provide scientific guidance for the engineering promotion of surface acoustic wave gas-phase explosives sensors.

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Section: Resultsmentioning

confidence: 99%

“…The signal response of TNT below 0.1 ppm could not be observed due to the limitation of experimental conditions. We used the International Union of Pure Applied Chemistry (IUPAC) standard to calculate the detection limit of the sensor where RMS noise is the root-mean-square of the noise of the sensor in the air and estimated by fitting a fifth-order polynomial.…”

Section: Resultsmentioning

confidence: 99%

A Composite Gas-Phase Explosives Sensor with Frequency-Resistance Dual-Signal Display Based on Surface Acoustic Wave

Yang

Wang

Zhu

et al. 2023

ACS Appl. Electron. Mater.

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“…The results are still competitive with the recently reported ones, e.g., Harathi et al developed a TiO 2 Nps/PrGO-based NO 2 sensor with a sensitivity of 14.9% at 100 ppm at room temperature. 65 In 2022, Bai et al reported a room temperature chemiresistive NO 2 sensor based on SnO 2 nanospheres functionalized with Pd nanoparticles and rGO nanosheets with a sensitivity of 7.92% toward 100 ppm. 66 In the same year, Guo demonstrated a room-temperature and ppb-level NO 2 sensor based on n-CdS/p-CuO heterojunction modified with rGO nanosheets.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Structured Graphene Oxide/Reduced Graphene Oxide Interfaces for Improved NO₂ Sensing

Kumar

Dmitrieva

Meng

et al. 2023

ACS Appl. Nano Mater.

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Here, we demonstrate an improvement in sensitivity toward the NO2 analyte by varying the width ratio of adjacent graphene oxide (GO) and reduced graphene oxide (rGO) layers using the GO laser reduction technique. We evaluated changes brought by laser reduction in material morphology, structure, electrical characteristics, and sensing performance depending on the GO/rGO ratio, which we supported by density functional theory calculations. Our results indicate that the reduction of GO yields the appearance of a chemiresistive response to NO2. An optimum GO/rGO width ratio ensures high conductivity paired with good sorption capacity, allowing to achieve chemiresistive response of 18.1% toward 100 ppm of NO2 at 25 ± 1 °C and a limit of detection of 230 ppb. The improved chemiresistive response of GO/rGO sensors upon NO2 physisorption is due to an increase in sorption energy and improved charge transfer in the presence of NO2 at the sites corresponding to the individual epoxy and hydroxyl groups at the GO/rGO interface area when compared to fully reduced GO.

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“…24 The application of UV illumination has demonstrated an enhancement in the gas sensing performance of nanocomposites. 25 It is an optimal strategy to stimulate the adsorption/desorption reactions on the metal oxide surfaces 26 and considerably improve the recovery and response of the sensors. 27 We take advantage of the excitation properties of UV light and the catalysis properties of Ag to improve the response value and response/recovery performance of the materials.…”

Section: ■ Introductionmentioning

confidence: 99%

Ultraviolet-Induced Gas Sensing Performance of Ag/WO₃/rGO Nanocomposites for H₂S Gas Sensors

Gui,

Wu,

Tian

et al. 2023

ACS Appl. Electron. Mater.

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The attention toward cost-effective and highperformance H 2 S sensors is increasing due to the growing need for physical health and environmental monitoring. In this paper, Ag/WO 3 /reduced graphene oxide (rGO) nanocomposites were synthesized by using a microwave-assisted gas−liquid interfacial method. Nanomaterials with different Ag doping contents were successfully prepared with AgNO 3 as an additive. The Ag/WO 3 / rGO sensors exhibit remarkable selectivity toward H 2 S, and the gas sensing performances of Ag-doped WO 3 /rGO gas sensors are significantly better than those of WO 3 /rGO. At 150 °C, the response value of the 10 wt % Ag/WO 3 /rGO gas sensor to 100 ppm H 2 S is 204.5, which is 7 times higher than that of WO 3 /rGO, and the response/recovery time of the sensor is 9/49 s, respectively. Additionally, the gas sensing performance of the sensor is further enhanced under ultraviolet (UV) irradiation. The response value is enhanced to 685.8, which is 3 times higher than that without UV irradiation, and the response/recovery time is reduced to 8/38 s, respectively. The sensing mechanism is also discussed. This work offers a potential application for H 2 S detection in environmental monitoring and smart healthcare.

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PrGO decorated TiO2 nanoplates hybrid nanocomposite for augmented NO2 gas detection with faster gas kinetics under UV light irradiation

Cited by 55 publications

References 43 publications

A Composite Gas-Phase Explosives Sensor with Frequency-Resistance Dual-Signal Display Based on Surface Acoustic Wave

A Composite Gas-Phase Explosives Sensor with Frequency-Resistance Dual-Signal Display Based on Surface Acoustic Wave

Structured Graphene Oxide/Reduced Graphene Oxide Interfaces for Improved NO₂ Sensing

Ultraviolet-Induced Gas Sensing Performance of Ag/WO₃/rGO Nanocomposites for H₂S Gas Sensors

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PrGO decorated TiO2 nanoplates hybrid nanocomposite for augmented NO2 gas detection with faster gas kinetics under UV light irradiation

Cited by 55 publications

References 43 publications

A Composite Gas-Phase Explosives Sensor with Frequency-Resistance Dual-Signal Display Based on Surface Acoustic Wave

A Composite Gas-Phase Explosives Sensor with Frequency-Resistance Dual-Signal Display Based on Surface Acoustic Wave

Structured Graphene Oxide/Reduced Graphene Oxide Interfaces for Improved NO2 Sensing

Ultraviolet-Induced Gas Sensing Performance of Ag/WO3/rGO Nanocomposites for H2S Gas Sensors

Contact Info

Product

Resources

About

Structured Graphene Oxide/Reduced Graphene Oxide Interfaces for Improved NO₂ Sensing

Ultraviolet-Induced Gas Sensing Performance of Ag/WO₃/rGO Nanocomposites for H₂S Gas Sensors