Photon stimulated sensor based on indium oxide nanoparticles I: Wide-concentration-range ozone monitoring in air

Wang, Ch. Y.; Becker, R.W.; Passow, T.; Pletschen, W.; Köhler, K.; Cimalla, V.; Ambacher, O.

doi:10.1016/j.snb.2010.12.014

Cited by 59 publications

(38 citation statements)

References 17 publications

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“…headache, burning eyes, respiratory irritation and lung damage). 34,41 The European Guidelines (2002/3/EG) recommend avoiding exposure to ozone levels above 120 ppb. 41 Such arguments support the requirement for the determination and continuous monitoring of ozone levels.…”

Section: -28mentioning

confidence: 99%

A novel ozone gas sensor based on one-dimensional (1D) α-Ag₂WO₄ nanostructures

et al. 2014

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aThis paper reports on a new ozone gas sensor based on a-Ag 2 WO 4 nanorod-like structures. Electrical resistance measurements proved the efficiency of a-Ag 2 WO 4 nanorods, which rendered good sensitivity even for a low ozone concentration (80 ppb), a fast response and a short recovery time at 300 C, demonstrating great potential for a variety of applications.Metal semiconducting oxides have drawn the interest of many researchers due to their wide range of applications, especially as gas sensing materials. 1-5 Among them, one-dimensional (1-D) semiconductor nanostructures have been proposed as very interesting materials, especially as gas sensor devices.6-12 It is well known that several technological applications of nanostructured materials are directly related to the morphology, particle size, crystalline phase and activity of specic crystalline planes strictly dependent on synthesis methods. 4,[13][14][15] In particular, the relationship between morphology and gas sensing properties has been well established. 4,16,17Tungsten-based oxides are an important class of materials that display wide potential functional properties, 18-20 speci-cally the silver tungstate (Ag 2 WO 4 ) compound, which can exhibit three different structures: a-orthorhombic, b-hexagonal, and g-cubic.21-25 Recently, our research group reported a detailed study of the synthesis, structural and optical properties of hexagonal nanorod-like elongated a-Ag 2 WO 4 nanocrystals obtained by different methods. 26-28Ozone (O 3 ) is an oxidizing gas used in many technological applications in different areas, such as the food industry, drinking-water treatment, medicine, microelectronic cleaning processes, and others.29,34-39 For example, ozone has been employed as a powerful drinking-water disinfectant and oxidant. 34,35,40 On the other hand, when the ozone level in an atmosphere exceeds a certain threshold value, the exposure to this gas becomes hazardous to human health and can cause serious health problems (e.g. headache, burning eyes, respiratory irritation and lung damage).34,41 The European Guidelines (2002/3/EG) recommend avoiding exposure to ozone levels above 120 ppb.41 Such arguments support the requirement for the determination and continuous monitoring of ozone levels. 3,29,41Gas sensing properties are evaluated in terms of operating temperature, sensitivity, response time, recovery time and stability.29-33 SnO 2 , In 2 O 3 and WO 3 compounds have been considered the most promising ozone gas sensors. 29-33To the best of our knowledge, to date the gas sensing properties of a-Ag 2 WO 4 nanocrystals have never been evaluated.Here, we report the sensing properties of 1-D a-Ag 2 WO 4 nanorod-like structures obtained by the microwave-assisted hydrothermal (MAH) method.42-46 Because of such properties, nanorods are potential candidates for practical applications as ozone gas sensors.The crystalline phase of the as-obtained a-Ag 2 WO 4 sample was analyzed by X-ray diffraction measurement and all reec-tions were indexed to an orthorhombic struc...

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Section: -28mentioning

confidence: 99%

A novel ozone gas sensor based on one-dimensional (1D) α-Ag₂WO₄ nanostructures

et al. 2014

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“…When the ozone generator was turned off, the adsorbed ozone molecules desorbed from the surface due to continuous UV irradiation, and the resistance returned to its initial value. This process was repeated for different ozone concentrations (13,11,4, and 0.4 ppm), and the maximum value of the resistance of SnO 2 increased accordingly (Fig. 3).…”

Section: Response Of Snomentioning

confidence: 99%

“…Researches have demonstrated that the responses of thin film semiconductor gas sensors are dependent on film thickness [3,5,6], operation temperature [6][7][8] and relative humidity [8][9][10][11][12]. Research also showed that a wide concentration range of ozone from 10 ppb to 200 ppm can be monitored by semiconductor gas sensors (In 2 O 3 nanoparticles) [13].…”

Section: Introductionmentioning

confidence: 99%

Fast gas concentration sensing by analyzing the rate of resistance change

Jiang

Chiu

et al. 2015

Sensors and Actuators B: Chemical

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“…As a great advantage ozone sensors based on defect‐rich In 2 O

_{3 - x}

films can be operated at room temperature compared to most solid gas sensors, which normally require temperatures between 200 and 600

^{\circ} normalC

. After oxidation the sensor can be regenerated by UV light . The UV irradiation causes a reduction of oxygen adsorbate concentration resulting in a strong reduction of the film resistivity and electron concentration allowing a reversal of the saturation of surface defects by oxygen adsorbates.…”

Section: Introductionmentioning

confidence: 99%

Interaction of indium oxide nanoparticle film surfaces with ozone, oxygen and water

Himmerlich

Eisenhardt

Berthold

et al. 2016

Physica Status Solidi (a)

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The interaction of defect-rich nanocrystalline indium oxide films, which have previously shown to exhibit excellent ozone sensing properties, with O-3, O-2, and H2O molecules is investigated using ultra-violet and X-ray photoelectron spectroscopy. The investigated samples are grown by metalorganic chemical vapor deposition at low temperatures resulting in high oxygen deficiency and high defect density. The ozone-induced surface oxidation and UV-induced photoreduction mechanisms of the ozone sensor active material are evaluated with respect to surface stoichiometry and electronic properties including adsorbate features, band bending and surface dipole formation. A strong interaction with ozone and water is found, whereas the interaction with O-2 is relatively weak. In all cases the interaction results in the same negatively charged oxygen adsorbate species. which can either be removed by UV light or by annealing resulting in the capability of these films to be used in reversible adsorption induced oxidation and UV/thermal reduction cycles

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Photon stimulated sensor based on indium oxide nanoparticles I: Wide-concentration-range ozone monitoring in air

Cited by 59 publications

References 17 publications

A novel ozone gas sensor based on one-dimensional (1D) α-Ag₂WO₄ nanostructures

A novel ozone gas sensor based on one-dimensional (1D) α-Ag₂WO₄ nanostructures

Fast gas concentration sensing by analyzing the rate of resistance change

Interaction of indium oxide nanoparticle film surfaces with ozone, oxygen and water

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Photon stimulated sensor based on indium oxide nanoparticles I: Wide-concentration-range ozone monitoring in air

Cited by 59 publications

References 17 publications

A novel ozone gas sensor based on one-dimensional (1D) α-Ag2WO4 nanostructures

A novel ozone gas sensor based on one-dimensional (1D) α-Ag2WO4 nanostructures

Fast gas concentration sensing by analyzing the rate of resistance change

Interaction of indium oxide nanoparticle film surfaces with ozone, oxygen and water

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A novel ozone gas sensor based on one-dimensional (1D) α-Ag₂WO₄ nanostructures

A novel ozone gas sensor based on one-dimensional (1D) α-Ag₂WO₄ nanostructures