Optimization of multilayer graphene-based gas sensors by ultraviolet photoactivation

Peña, Álvaro; Matatagui, Daniel; Ricciardella, Filiberto; Sacco, Leandro; Vollebregt, Sten; Otero, Daniel; López-Sánchez, Jesús; Marı́n, P.; Horrillo, M.C.

doi:10.1016/j.apsusc.2022.155393

Cited by 19 publications

(7 citation statements)

References 61 publications

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“…However, its application has been restricted because of issues such as a low sensitivity, poor selectivity, large band gap, and high operation temperature. Recently, graphene, graphene oxide (GO), and reduced graphene oxide (rGO) have been accepted as a good candidate for improving the functional properties of metal oxide at room temperature [30][31][32][33][34][35][36]. It has been very sensitive to chemicals owing to its monolayer structure such as high thermal conductivity, high specific surface area, and high electron mobility at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Hydrogen Sulfide on Reduced Graphene Oxide-Wrapped Titanium Dioxide Nanofibers

Kamlangkla,

Phongphala,

Pakdee

2023

Adsorption Science & Technology

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This work presents a fabrication of room-temperature gas sensor for hydrogen sulfide (H2S) adsorption. Pristine titanium dioxide (TiO2) nanofibers, reduced graphene oxide (rGO) sheets, and reduced graphene oxide-wrapped titanium dioxide (rGO-wrapped TiO2) nanofibers were presented in the form of integrated suspension used for a gas-sensing layer. The TiO2 nanofibers were firstly synthesized by using an electrospinning method with a polyvinylpyrrolidone (PVP) polymer. The rGO sheets were then wrapped around TiO2 nanofibers by a hydrothermal method. Scanning electron microscope, transmission electron microscope, X-ray diffractometer, and Raman spectrometer confirmed the presence of rGO sheets onto the surface of TiO2 nanofibers. Ultraviolet-visible spectrophotometer was also considered and displayed to calculate the band gap of TiO2 and rGO-wrapped TiO2 nanofibers. After preparing the gas-sensing suspensions, they were dropped onto the polyethylene terephthalate substrates with silver-interdigitated electrodes. The gas-sensing properties of sensors were evaluated for H2S adsorption at room temperature. Based on the results, the rGO-wrapped TiO2 nanofiber gas sensor exhibited higher H2S sensitivity and selectivity than pristine TiO2 nanofiber and pure rGO gas sensors. The H2S-sensing mechanism of rGO-wrapped TiO2 nanofiber gas sensor was discussed based on a formation of p-n heterojunctions between p-type rGO sheets and n-type TiO2 nanofibers. Furthermore, a direct charge-transfer process by physisorption was also highlighted as a second H2S-sensing mechanism.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Hydrogen Sulfide on Reduced Graphene Oxide-Wrapped Titanium Dioxide Nanofibers

Kamlangkla,

Phongphala,

Pakdee

2023

Adsorption Science & Technology

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“…For example, graphene, having high carrier mobility, chemical, and thermal stability, was the primary two-dimensional single-element material and has been considered in various fields. Moreover, fast reaction time, high sensitivity, appropriate selectivity, fast recoverability, and less power consumption, have made it a promising material for gas sensing [17][18][19][20]. In addition to the graphene sheets, other configurations of this material, such as metal-decorated [21,22], ribbon [23,24], folded graphene nanoribbon [25] nanotube [26,27], or graphene oxide [28][29][30], are also used in sensing applications.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Xenes nanoribbons for sensing CO, CO₂, and CH₄ gases

Alaee,

Sadeghzadeh,

Ostovari

2023

Phys. Scr.

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Xenes can be suitable candidates for sensing applications. So, their nanoribbon’s capabilities as carbon gas sensors have been investigated by employing tight-binding approximation coupling to Non-Equilibrium Green’s Function. The armchair type of graphene, silicene, and phosphorene nanoribbons (AGNR, ASiNR, and APNR) are selected from Xenes materials for sensing CO, CO2, and CH4 as carbon-based gases in different concentrations. Our study shows that AGNR-based sensors are sensitive to CO and CO2 gas molecules at low concentrations (below 0.15). ASiNR-based sensors have considerable sensitivity to all CO and CH4 gas molecule concentrations. However, APNR-based sensors can only detect CO2 gas molecules. While AGNR-based sensors show the best selectivity properties in the presence of three gases, and ASiNR-based sensors can select CO gas molecules from the rest. Although, APNR-based sensors show weak selectivity. Furthermore, due to their bond type, the APNR-based sensor has less recovery time than AGNR- and ASiNR-based gas sensors.

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“…It has been demonstrated that not only are the dynamics of recovery assisted by UV irradiation, but continuous irradiation also improves the sensing performance for some gas species. By enhancing oxidation or reduction with light irradiation, sensors show improved gas response and can rapidly recover after being exposed to a target gas [36]. Because the physical mechanisms are not yet understood, the irradiation parameters of wavelength and optical power must currently be optimised empirically for a sensor-analyte pair.…”

Section: Introductionmentioning

confidence: 99%

Insecticide Monitoring in Cattle Dip with an E-Nose System and Room Temperature Screen-Printed ZnO Gas Sensors

2023

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Taktic, an Amitraz-based insecticide, is commonly used in sub-Saharan Africa to treat cattle for ticks. Due to misuse in rural dipping pools, some ticks are showing resistance to Taktic. This work presents a low-cost e-nose with commercial sensors to monitor Taktic levels in dipping pool water. The device shows distinctly different measurements for the odours of air, distilled water, farm water, and four levels of Taktic insecticide in farm water. A naive Bayes algorithm with a Gaussian distribution is trained on the data and a validation set achieves a 96.5% accuracy. This work also compares two sol-gel ZnO nanoparticle solutions with an off-the-shelf ZnO nanoparticle ink for use as active material in chemiresistive gas sensors to be employed in an e-nose array. The ZnO solutions are screen-printed onto gold electrodes, auto-sintered with a built in heater, and used with UV illumination to operate as low-power, room temperature gas sensors. All of the screen-printed ZnO sensors show distinct changes in resistance when exposed to Taktic vapours under room temperature and humidity conditions. The custom room temperature ZnO gas sensors fabricated via facile and low-cost processes are suitable for future integration in a point-of-need microsystem for the detection of Taktic in water.

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Optimization of multilayer graphene-based gas sensors by ultraviolet photoactivation

Cited by 19 publications

References 61 publications

Adsorption of Hydrogen Sulfide on Reduced Graphene Oxide-Wrapped Titanium Dioxide Nanofibers

Adsorption of Hydrogen Sulfide on Reduced Graphene Oxide-Wrapped Titanium Dioxide Nanofibers

Simulation of the Xenes nanoribbons for sensing CO, CO₂, and CH₄ gases

Insecticide Monitoring in Cattle Dip with an E-Nose System and Room Temperature Screen-Printed ZnO Gas Sensors

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Optimization of multilayer graphene-based gas sensors by ultraviolet photoactivation

Cited by 19 publications

References 61 publications

Adsorption of Hydrogen Sulfide on Reduced Graphene Oxide-Wrapped Titanium Dioxide Nanofibers

Adsorption of Hydrogen Sulfide on Reduced Graphene Oxide-Wrapped Titanium Dioxide Nanofibers

Simulation of the Xenes nanoribbons for sensing CO, CO2, and CH4 gases

Insecticide Monitoring in Cattle Dip with an E-Nose System and Room Temperature Screen-Printed ZnO Gas Sensors

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Product

Resources

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Simulation of the Xenes nanoribbons for sensing CO, CO₂, and CH₄ gases