UV-Activated NO2 Gas Sensing by Nanocrystalline ZnO: Mechanistic Insights from Mass Spectrometry Investigations

Чижов, А. С.; Kutukov, Pavel; Гулин, А. А.; Astafiev, Artyom A.; Rumyantseva, M. N.

doi:10.3390/chemosensors10040147

Cited by 11 publications

(12 citation statements)

References 60 publications

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“…The method for examining the gas-sensitive properties of nanocrystalline oxides and the setup for sensor measurements are described in detail in our previous work [ 43 ]. Briefly, the gas-sensitive properties of the synthesized oxides were studied by in situ measurement of the electrical resistance of thick (about 100

m) conducting polycrystalline porous films.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…A thick conductive layer was formed on the measuring plates over the Pt electrodes by annealing at 300 °C a pasty mixture of metal oxide with

-terpineol. The obtained sensors have a linear current–voltage characteristic at bias up to 4 V [ 43 ].…”

Section: Materials and Methodsmentioning

confidence: 99%

“…The setup for in situ mass spectrometric measurements under dark conditions and under UV radiation is described in detail in our previous work [ 43 ]. Generally, it consists of a flow PTFE cell (internal volume 15 mL) with a quartz window for irradiation of samples, a set of UV LEDs for irradiation (

nm), an electric heater allows to heat samples up to 150 °C, gas and electrical circuits for controlling the cell.…”

Section: Materials and Methodsmentioning

confidence: 99%

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Photoactivated Processes on the Surface of Metal Oxides and Gas Sensitivity to Oxygen

Чижов

Kutukov

Astafiev

et al. 2023

Sensors

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Photoactivation by UV and visible radiation is a promising approach for the development of semiconductor gas sensors with reduced power consumption, high sensitivity, and stability. Although many hopeful results were achieved in this direction, the theoretical basis for the processes responsible for the photoactivated gas sensitivity still needs to be clarified. In this work, we investigated the mechanisms of UV-activated processes on the surface of nanocrystalline ZnO, In2O3, and SnO2 by in situ mass spectrometry and compared the obtained results with the gas sensitivity to oxygen in the dark and at UV irradiation. The results revealed a correlation between the photoactivated oxygen isotopic exchange activity and UV-activated oxygen gas sensitivity of the studied metal oxides. To interpret the data obtained, a model was proposed based on the idea of the generation of additional oxygen vacancies under UV irradiation due to the interaction with photoexcited holes.

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m) conducting polycrystalline porous films.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…A thick conductive layer was formed on the measuring plates over the Pt electrodes by annealing at 300 °C a pasty mixture of metal oxide with

-terpineol. The obtained sensors have a linear current–voltage characteristic at bias up to 4 V [ 43 ].…”

Section: Materials and Methodsmentioning

confidence: 99%

nm), an electric heater allows to heat samples up to 150 °C, gas and electrical circuits for controlling the cell.…”

Section: Materials and Methodsmentioning

confidence: 99%

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Photoactivated Processes on the Surface of Metal Oxides and Gas Sensitivity to Oxygen

Чижов

Kutukov

Astafiev

et al. 2023

Sensors

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“…The synthesized nanocrystalline ZnO (5 mg) was mixed with 50

L of

-terpineol in an agate mortar and the resulting mixture was ground to form a thick dispersion, which was applied to the surface of the measuring plate with a volume of 2–3

L, then dried at 70

C and annealed at 300

C for 24 h. After annealing, a nanocrystalline conductive ZnO film with a thickness of about 100

m with a linear current-voltage characteristic was obtained. A more detailed characterization of the ZnO layers obtained by this method is given in our previous works, for example [ 61 ].…”

Section: Methodsmentioning

confidence: 99%

Sensitization of ZnO Photoconductivity in the Visible Range by Colloidal Cesium Lead Halide Nanocrystals

et al. 2022

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In this work, colloidal perovskite nanocrystals (PNCs) are used to sensitize the photoconductivity of nanocrystalline ZnO films in the visible range. Nanocrystalline ZnO with a crystallite size of 12–16 nm was synthesized by precipitation of a zinc basic carbonate from an aqueous solution, followed by annealing at 300 °C. Perovskite oleic acid- and oleylamine-capped CsPbBr3, CsPb(Cl/Br)3 and CsPb(Br/I)3 PNCs with a size of 6–13 nm were synthesized by a hot injection method at 170 °C in 1-octadecene. Photoconductive nanocomposites were prepared by applying a hexane sol of PNCs to a thick (100 μm) polycrystalline conductive ZnO layer. The spectral dependence of the photoconductivity, the dependence of the photoconductivity on irradiation, and the relaxation of the photoconductivity of the obtained nanocomposites have been studied. Sensitization of ZnO by CsPbBr3 and CsPb(Cl/Br)3 PNCs leads to enhanced photoconductivity in the visible range, the maximum of which is observed at 460 and 500 nm, respectively; close to the absorption maximum of PNCs. Nanocomposites ZnO/CsPb(Br/I)3 turned out to be practically not photosensitive when irradiated with light in the visible range. The data obtained are discussed in terms of the position of the energy levels of ZnO and PNCs and the probable PNCs photodegradation. The structure, morphology, composition, and optical properties of the synthesized nanocrystals have also been studied by XRD, TEM, and XPS. The results can be applied to the creation of artificial neuromorphic systems in the visible optical range.

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“…Over the years, many publications have demonstrated the suitability of low-power UV LEDs to activate the surface sensing mechanism of many SMO films at low or room temperatures, such as SnO 2 [ 99 ], In 2 O 3 [ 100 ], ZnO [ 101 ], WO 3 [ 102 ], and TiO 2 [ 103 ]. While many authors noted a clear increase in the sensitivity response, the SMO sensors nevertheless—whether UV-enhanced or not—still suffered from poor selectivity when a single metal oxide material was used.…”

Section: State-of-the-art In Gas Sensing Technologiesmentioning

confidence: 99%

Application of Two-Dimensional Materials towards CMOS-Integrated Gas Sensors

Filipovic

Selberherr

2022

Nanomaterials

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During the last few decades, the microelectronics industry has actively been investigating the potential for the functional integration of semiconductor-based devices beyond digital logic and memory, which includes RF and analog circuits, biochips, and sensors, on the same chip. In the case of gas sensor integration, it is necessary that future devices can be manufactured using a fabrication technology which is also compatible with the processes applied to digital logic transistors. This will likely involve adopting the mature complementary metal oxide semiconductor (CMOS) fabrication technique or a technique which is compatible with CMOS due to the inherent low costs, scalability, and potential for mass production that this technology provides. While chemiresistive semiconductor metal oxide (SMO) gas sensors have been the principal semiconductor-based gas sensor technology investigated in the past, resulting in their eventual commercialization, they need high-temperature operation to provide sufficient energies for the surface chemical reactions essential for the molecular detection of gases in the ambient. Therefore, the integration of a microheater in a MEMS structure is a requirement, which can be quite complex. This is, therefore, undesirable and room temperature, or at least near-room temperature, solutions are readily being investigated and sought after. Room-temperature SMO operation has been achieved using UV illumination, but this further complicates CMOS integration. Recent studies suggest that two-dimensional (2D) materials may offer a solution to this problem since they have a high likelihood for integration with sophisticated CMOS fabrication while also providing a high sensitivity towards a plethora of gases of interest, even at room temperature. This review discusses many types of promising 2D materials which show high potential for integration as channel materials for digital logic field effect transistors (FETs) as well as chemiresistive and FET-based sensing films, due to the presence of a sufficiently wide band gap. This excludes graphene from this review, while recent achievements in gas sensing with graphene oxide, reduced graphene oxide, transition metal dichalcogenides (TMDs), phosphorene, and MXenes are examined.

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UV-Activated NO2 Gas Sensing by Nanocrystalline ZnO: Mechanistic Insights from Mass Spectrometry Investigations

Cited by 11 publications

References 60 publications

Photoactivated Processes on the Surface of Metal Oxides and Gas Sensitivity to Oxygen

Photoactivated Processes on the Surface of Metal Oxides and Gas Sensitivity to Oxygen

Sensitization of ZnO Photoconductivity in the Visible Range by Colloidal Cesium Lead Halide Nanocrystals

Application of Two-Dimensional Materials towards CMOS-Integrated Gas Sensors

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