Fast response–recovery time toward acetone by a sensor prepared with Pd doped WO<sub>3</sub> nanosheets

He, Ke; Jin, Zhao; Chu, Xiangcheng; Bi, Wenjie; Wu, Weiqi; Wang, Chao; Liu, Shantang

doi:10.1039/c9ra04429a

Cited by 36 publications

(23 citation statements)

References 62 publications

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“…Here, we can see that the highest response of ∼100% is for the working temperature of 350 °C with response and recovery/decay times of τ r = 14.4 s and τ d = 27.1 s, respectively. Several methods are available to enhance the response vs recovery times of the sensors, such as changing the heat treatment regime, 20 doping with different impurities 55 or functionalizing with nanoparticles of noble metals. 43 The latter has been used by us in this study case and will be investigated thoroughly and reported in future work.…”

Section: Resultsmentioning

confidence: 99%

Single CuO/Cu₂O/Cu Microwire Covered by a Nanowire Network as a Gas Sensor for the Detection of Battery Hazards

Lupan

Ababii

Mishra

et al. 2020

ACS Appl. Mater. Interfaces

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In this study, a strategy to prepare CuO/Cu2O/Cu microwires that are fully covered by a nanowire (NW) network using a simple thermal-oxidation process is developed. The CuO/Cu2O/Cu microwires are fixed on Au/Cr pads with Cu microparticles. After thermal annealing at 425 °C, these CuO/Cu2O/Cu microwires are used as room-temperature 2-propanol sensors. These sensors show different dominating gas responses with operating temperatures, e.g., higher sensitivity to ethanol at 175 °C, higher sensitivity to 2-propanol at room temperature and 225 °C, and higher sensitivity to hydrogen gas at ∼300 °C. In this context, we propose the sensing mechanism of this three-in-one sensor based on CuO/Cu2O/Cu. X-ray diffraction (XRD) studies reveal that the annealing time during oxidation affects the chemical appearance of the sensor, while the intensity of reflections proves that for samples oxidized at 425 °C for 1 h the dominating phase is Cu2O, whereas upon further increasing the annealing duration up to 5 h, the CuO phase becomes dominant. The crystal structures of the Cu2O–shell/Cu–core and the CuO NW networks on the surface were confirmed with a transmission electron microscope (TEM), high-resolution TEM (HRTEM), and selected area electron diffraction (SAED), where (HR)TEM micrographs reveal the monoclinic CuO phase. Density functional theory (DFT) calculations bring valuable inputs to the interactions of the different gas molecules with the most stable top surface of CuO, revealing strong binding, electronic band-gap changes, and charge transfer due to the gas molecule interactions with the top surface. This research shows the importance of the nonplanar CuO/Cu2O layered heterostructure as a bright nanomaterial for the detection of various gases, controlled by the working temperature, and the insight presented here will be of significant value in the fabrication of new p-type sensing devices through simple nanotechnology.

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Section: Resultsmentioning

confidence: 99%

Single CuO/Cu₂O/Cu Microwire Covered by a Nanowire Network as a Gas Sensor for the Detection of Battery Hazards

Lupan

Ababii

Mishra

et al. 2020

ACS Appl. Mater. Interfaces

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“…Among them, although acetone is not carcinogenic like formaldehyde, it is slightly toxic. (1) Its main harmful effects are anesthesia and inhibition of the central nervous system. Long-term exposure to an environment with acetone content higher than 1% may cause headaches, vomiting, and even coma.…”

Section: Introductionmentioning

confidence: 99%

“…Their newly designed thin-film acetone gas sensor showed a wide linear range (10-300 mg/cm 3 acetone) at a working temperature of 200 °C. In the same year, He et al (13) synthesized Pd-WO 3 nanosheets through a one-step hydrothermal method using Na 2 PdCl 4 solution as the palladium source and sodium tungstate as the tungsten source, and used them to detect acetone. The detection limit for acetone was 50 ppb at the optimum working temperature of 300 °C, and the selectivity for acetone was excellent in a 100 ppm acetone atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Graphene Quantum Dots and Their Sensing Properties in Quartz Crystal Microbalance Acetone Sensor

Wang¹,

Lin²,

Lin³

et al. 2021

Sensors and Materials

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Acetone is a slightly toxic volatile organic gas, which exists in the breath and is closely related to diseases such as diabetes. In this paper, a quartz crystal microbalance (QCM) was used to fabricate an acetone sensor, and graphene quantum dots (GQDs) were used as a gas-sensing material to modify the QCM. GQDs were prepared by citrate pyrolysis and characterized by high-resolution transmission electron microscopy (TEM). The gas sensitivity of the sensor to low concentrations of acetone was investigated. It exhibited good linearity at acetone concentrations of less than 240 ppm with a sensitivity of 16.78 Hz/ppm and a minimum detection limit of 2.5 ppm, and the fitted line had a coefficient of determination R 2 of 0.95658. In a mixture of acetone, butanol, and isopropanol, the sensor exhibited good selectivity for acetone. For different acetone concentrations, the response speed of the same sensor was basically the same, and the response and recovery times were 32 and 48 s, respectively. We showed that the prepared gas sensor has good sensitivity, repeatability, and selectivity for low concentrations of acetone.

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“…Due to their simple preparation process and low cost, metal-oxidesemiconductor sensors have been widely used in the detection of acetone gas. 2,3 NiO is a p-type semiconductor, which has been used as a sensing material for VOCs sensors, because of the high VOCs catalytic activity and oxygen adsorption characteristics. [4][5][6] The previous report has shown that the gas-sensing performance of p-type metal oxides is much lower than that of the n-type metal oxides.…”

Section: Introductionmentioning

confidence: 99%

“…Due to their simple preparation process and low cost, metal-oxide-semiconductor sensors have been widely used in the detection of acetone gas. 2,3 …”

Section: Introductionmentioning

confidence: 99%

High acetone sensing properties of In₂O₃–NiO one-dimensional heterogeneous nanofibers based on electrospinning

Fan

2021

RSC Adv.

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Fast response–recovery time toward acetone by a sensor prepared with Pd doped WO₃ nanosheets

Abstract: Pd-WO3 nanosheets were synthesized through a one-step hydrothermal method using Na2PdCl4 solution as the palladium source and sodium tungstate as the tungsten source, and were used to detect acetone.

Cited by 36 publications

References 62 publications

Single CuO/Cu₂O/Cu Microwire Covered by a Nanowire Network as a Gas Sensor for the Detection of Battery Hazards

Single CuO/Cu₂O/Cu Microwire Covered by a Nanowire Network as a Gas Sensor for the Detection of Battery Hazards

Preparation of Graphene Quantum Dots and Their Sensing Properties in Quartz Crystal Microbalance Acetone Sensor

High acetone sensing properties of In₂O₃–NiO one-dimensional heterogeneous nanofibers based on electrospinning

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Fast response–recovery time toward acetone by a sensor prepared with Pd doped WO3 nanosheets

Abstract: Pd-WO3 nanosheets were synthesized through a one-step hydrothermal method using Na2PdCl4 solution as the palladium source and sodium tungstate as the tungsten source, and were used to detect acetone.

Cited by 36 publications

References 62 publications

Single CuO/Cu2O/Cu Microwire Covered by a Nanowire Network as a Gas Sensor for the Detection of Battery Hazards

Single CuO/Cu2O/Cu Microwire Covered by a Nanowire Network as a Gas Sensor for the Detection of Battery Hazards

Preparation of Graphene Quantum Dots and Their Sensing Properties in Quartz Crystal Microbalance Acetone Sensor

High acetone sensing properties of In2O3–NiO one-dimensional heterogeneous nanofibers based on electrospinning

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Resources

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Fast response–recovery time toward acetone by a sensor prepared with Pd doped WO₃ nanosheets

Single CuO/Cu₂O/Cu Microwire Covered by a Nanowire Network as a Gas Sensor for the Detection of Battery Hazards

Single CuO/Cu₂O/Cu Microwire Covered by a Nanowire Network as a Gas Sensor for the Detection of Battery Hazards

High acetone sensing properties of In₂O₃–NiO one-dimensional heterogeneous nanofibers based on electrospinning