Gas Sensors Based on Semiconducting Metal Oxide One-Dimensional Nanostructures

Huang, Jin; Wan, Qing

doi:10.3390/s91209903

Cited by 372 publications

(201 citation statements)

References 95 publications

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“…Here, we prepared CuO nanowires by thermal oxidation and electrical characterizations were made to individual devices contacted in 4-probe configuration. Responses to NH 3 and H 2 S of the nanowires were examined to qualitatively describe the working principle behind their performance, paving the way to more complex studies that combine experimental data and simulation studies in the same way that previous works on SnO 2 nanowire sensors [17]. Here, an unequivocal correlation was established between the experimental data and the p-character of the CuO.…”

Section: Introductionmentioning

confidence: 77%

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Copper (II) oxide nanowires for p-type conductometric NH3 sensing

Shao

Hernández-Ramírez

Prades

et al. 2014

Applied Surface Science

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Copper (II) oxide (CuO) is a metal oxide suitable for developing solid state gas sensors.Nevertheless, a detailed insight into the chemical-to-electrical transduction mechanisms between gas molecules and this metal oxide is still limited. Here, individual CuO nanowires were evaluated as ammonia (NH 3 ) and hydrogen sulphide (H 2 S) sensors, validating the p-type character of this semiconductor. The working principle behind their performance was qualitatively modelled and it was concluded that adsorbed oxygen at the surface plays a key role necessary to explain the experimental data. Compared to their counterparts of SnO 2 nanowires, an appreciable sensitivity enhancement to NH 3 for concentrations below 100 ppm was demonstrated.

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Section: Introductionmentioning

confidence: 77%

“…Metal oxides (MOX) show outstanding sensing properties to different chemical species with simple and cost effective device configurations [1][2][3]. Compared to n-type metal oxides, the existing knowledge about the surface chemistry of gas molecules onto p-type materials remains however poorly explored.…”

Section: Introductionmentioning

confidence: 99%

Copper (II) oxide nanowires for p-type conductometric NH3 sensing

Shao

Hernández-Ramírez

Prades

et al. 2014

Applied Surface Science

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“…[1][2][3][4][5] Metal oxides have been extensively employed as gas sensing materials due to their low cost and high compatibility with microelectronic processing. [1][2][3][4][5][6][7][8][9] Among semiconductor metal-oxides, WO 3 is considered as one of the most promising materials for toxic gas detection, 10,11 in particular for ammonia detection.…”

Section: Introductionmentioning

confidence: 99%

Surface interaction of WO3 nanocrystals with NH3. Role of the exposed crystal surfaces and porous structure in enhancing the electrical response

et al. 2014

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We report on the surface interaction between NH 3 and WO 3 nanoparticles having different exposed surfaces or different porous structure, to identify the relative importance of exposed crystal surfaces, porous architecture, and specific surface area in the oxide sensing properties. WO 3 nanocrystals with tailored morphology and definite prominent surfaces were synthesized by hydrothermal reactions. In parallel, inverted opal macroporous WO 3 films have been prepared by a one-step sol-gel procedure, and WO 3 hierarchical layers have been obtained by an innovative one-step dual-templating strategy which leads to macropores and mesopores simultaneously. The performances of WO 3 samples in NH 3 sensing, indicate that high-energy surfaces result in a significant improvement of the electrical response.Enhanced porous structure and high surface area are not enough to produce high electrical response, while their synergistic combination with tailored crystal faceting appears effective. XPS survey performed on shape controlled WO 3 nanocrystals demonstrated that, upon interaction with NH 3 , oxidized nitrogen atoms represent the prevalent species on the surface of rectangular (WO 3 -RE) nanocrystals with highly exposed high-energy {020} and {002} facets. Conversely, in the case of rectangular platelets and square platelets (WO 3 -RS) with very low surface area of high-energy surfaces, N-H surface groups are predominant. These results suggest that {020} and {002} crystal surfaces provide privileged reactive sites for ammonia oxidation and therefore they play a key role in driving the sensing properties of the WO 3 layers.

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“…Sensitivity also depends on factors other than the crystallite size, such as the concentration of adsorption sites, the energy levels within the material, and the adsorption/desorption energies of interacting gas molecules, which are dependent on the shape, microstructure and crystallographic orientation of crystallite planes within the nanoparticle [4]. In this context nanostructured materials (NSM) such as nanowires (NW), nanobelts (NB), nanoribbons (NR), and nanoneedles (NN) may have an impact in all these factors, and enhance the performance of the sensing films, making NSM very attractive for gas sensor applications [5][6][7]. To date, three approaches for fabricating chemoresistive gas sensors based on NSM have been used [5].…”

Section: Introductionmentioning

confidence: 99%

“…In this context nanostructured materials (NSM) such as nanowires (NW), nanobelts (NB), nanoribbons (NR), and nanoneedles (NN) may have an impact in all these factors, and enhance the performance of the sensing films, making NSM very attractive for gas sensor applications [5][6][7]. To date, three approaches for fabricating chemoresistive gas sensors based on NSM have been used [5]. The first deals with single structures (e.g.…”

Section: Introductionmentioning

confidence: 99%

Important considerations for effective gas sensors based on metal oxide nanoneedles films

Stoycheva

Vallejos

Blackman

et al. 2012

Sensors and Actuators B: Chemical

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Gas sensor devices based on either polycrystalline or nanoneedle tungsten oxide were deposited in situ on classical ceramic substrates via AACVD, and subsequently functionalised with gold nanoparticles via sputtering. The sensing properties of the films were tested to a wide range of analytes, revealing high responses to ethanol, hydrogen, and nitrogen dioxide, at low operating temperatures (≤ 250 ºC), and a lack of response to carbon monoxide, ammonia, and hydrogen sulfide. In addition, the sensing responses to hydrogen and nitrogen dioxide, at 100 ºC and 150 ºC, were improved by using gold functionalised structures. Modest differences of the sensor response magnitude in polycrystalline, and nanoneedle films were observed, suggesting the need of special substrate platforms for effective application of nanostructured films in gas sensors devices.

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Gas Sensors Based on Semiconducting Metal Oxide One-Dimensional Nanostructures

Cited by 372 publications

References 95 publications

Copper (II) oxide nanowires for p-type conductometric NH3 sensing

Copper (II) oxide nanowires for p-type conductometric NH3 sensing

Surface interaction of WO3 nanocrystals with NH3. Role of the exposed crystal surfaces and porous structure in enhancing the electrical response

Important considerations for effective gas sensors based on metal oxide nanoneedles films

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