The Role of Hierarchical Morphologies in the Superior Gas Sensing Performance of CuO‐Based Chemiresistors

Volanti, Diogo P.; Felix, Anderson A.; Orlandi, Marcelo Ornaghi; Whitfield, George C.; Yang, Daejong; Longo, Elson; Tuller, Harry L.; Varela, José Arana

doi:10.1002/adfm.201202332

Cited by 277 publications

(191 citation statements)

References 60 publications

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“…The porous structure is obviously different from the literature for those leaves-like or sheet structures of CuO. [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] The surface area of these CuO nanosheets obtained based on the BET method is 10.03 m 2 ·g -1 . These porous CuO nanosheets are efficient for the gas flowing in and out, thus enhancing their gas sensing performance.…”

Section: Structural Characterizationmentioning

confidence: 71%

Room-Temperature High-Performance H₂S Sensor Based on Porous CuO Nanosheets Prepared by Hydrothermal Method

Wang

Lin

et al. 2016

ACS Appl. Mater. Interfaces

239

109

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Porous CuO nanosheets were prepared on alumina tubes using a facile hydrothermal method, and their morphology, microstructure and gas sensing properties were investigated. The monoclinic CuO nanosheets had an average thickness of 62.5 nm and were embedded with numerous holes with diameters ranging 5 nm to 17 nm. The porous CuO nanosheets were used to fabricate gas sensors to detect hydrogen sulfide (H 2 S) operated at room temperature. The sensor showed a good response sensitivity of 1.25 with the respond/recovery time of 234 s and 76 s, respectively, when tested with the H 2 S concentrations as low as 10 ppb. It also showed a remarkably high selectivity to the H 2 S, but only minor responses to other gases such as SO 2 , NO, NO 2 , H 2 , CO and C 2 H 5 OH. The working principle of the porous CuO nanosheets based sensor to detect the H 2 S was identified to be the phase transition from semiconducting CuO to a metallic conducting CuS.

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Section: Structural Characterizationmentioning

confidence: 71%

Room-Temperature High-Performance H₂S Sensor Based on Porous CuO Nanosheets Prepared by Hydrothermal Method

Wang

Lin

et al. 2016

ACS Appl. Mater. Interfaces

239

109

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“…The performance of the YZO NRs GISs was systematically tested in different gas environments, including air, O 2 , N 2 , CO 2 , CH 4 and Ar, at a fixed standard atmospheric gas pressure (1000 mbar). The ionization process follows Townsend's mechanism and the breakdown voltage, V bd , is determined by the Paschen's law given by Eq.…”

Section: Gis Performancesmentioning

confidence: 99%

“…Gas sensors are generally classified as chemical or physical types based on their operational mechanism. Most of the conventional gas sensors are of the chemical type in which chemisorbed target gases on metal oxide [4][5][6][7], silicon [8] and carbon nanotube (CNT) [2,9,10] substrates are quantified by the responses of their electrical [11] or optical property [12]. However, these types of sensors suffer from limited selectivity [11,13] and difficulties in detecting gases with poor adsorption.…”

Section: Introductionmentioning

confidence: 99%

An enhanced gas ionization sensor from Y-doped vertically aligned conductive ZnO nanorods

Lee

Fang

Turner

et al. 2016

Sensors and Actuators B: Chemical

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A stable and highly sensitive gas ionization sensor (GIS) constructed from vertically aligned, conductive yttrium-doped ZnO nanorod (YZO NR) arrays is demonstrated. The conductive YZO NRs are synthesized using a facile one-pot hydrothermal method. At higher Y/Zn molar ratio, the aspect ratio of the YZO NRs is increased from 11 to 25. Doping with yttrium atoms decreases the electrical resistivity of ZnO NRs more than 100 fold. GIS measurements reveal a 6-fold enhancement in the sensitivity accompanied with a significant reduction in breakdown voltage from the highly conductive YZO NRs. Direct correlations between the resistivity of the NRs and GIS characteristics are established. 1 An Enhanced Gas Ionization Sensor from Y-doped Vertically Aligned Conductive ZnO Nanorods AbstractA stable and highly sensitive gas ionization sensor (GIS) constructed from vertically aligned, conductive yttrium-doped ZnO nanorod (YZO NR) arrays is demonstrated. The conductive YZO NRs are synthesized using a facile one-pot hydrothermal method. At higher Y/Zn molar ratio, the aspect ratio of the YZO NRs is increased from 11 to 25. Doping with yttrium atoms decreases the electrical resistivity of ZnO NRs more than 100 fold. GIS measurements reveal a 6-fold enhancement in the sensitivity accompanied with a significant reduction in breakdown voltage from the highly conductive YZO NRs. Direct correlations between the resistivity of the NRs and GIS characteristics are established.

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“…4,[13][14][15] In particular, the relationship between morphology and gas sensing properties has been well established.…”

mentioning

confidence: 99%

“…[1][2][3][4][5] Among them, one-dimensional (1-D) semiconductor nanostructures have been proposed as very interesting materials, especially as gas sensor devices. [6][7][8][9][10][11][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.…”

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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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The Role of Hierarchical Morphologies in the Superior Gas Sensing Performance of CuO‐Based Chemiresistors

Cited by 277 publications

References 60 publications

Room-Temperature High-Performance H₂S Sensor Based on Porous CuO Nanosheets Prepared by Hydrothermal Method

Room-Temperature High-Performance H₂S Sensor Based on Porous CuO Nanosheets Prepared by Hydrothermal Method

An enhanced gas ionization sensor from Y-doped vertically aligned conductive ZnO nanorods

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

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The Role of Hierarchical Morphologies in the Superior Gas Sensing Performance of CuO‐Based Chemiresistors

Cited by 277 publications

References 60 publications

Room-Temperature High-Performance H2S Sensor Based on Porous CuO Nanosheets Prepared by Hydrothermal Method

Room-Temperature High-Performance H2S Sensor Based on Porous CuO Nanosheets Prepared by Hydrothermal Method

An enhanced gas ionization sensor from Y-doped vertically aligned conductive ZnO nanorods

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

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Product

Resources

About

Room-Temperature High-Performance H₂S Sensor Based on Porous CuO Nanosheets Prepared by Hydrothermal Method

Room-Temperature High-Performance H₂S Sensor Based on Porous CuO Nanosheets Prepared by Hydrothermal Method

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