Urchin-like ZnO nanorod arrays for gas sensing applications

Barreca, Davide; Bekermann, Daniela; Comini, Elisabetta; Devi, Anjana; Fischer, Roland A.; Gasparotto, Alberto; Maccato, Chiara; Sada, Cinzia; Tondello, Eugenio

doi:10.1039/c0ce00139b

Cited by 100 publications

(131 citation statements)

References 21 publications

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“…Nano structured metal oxide semiconductors such as ZnO, SnO 2 , TiO 2 and WO 3 [21][22][23][24][25][26][27][28] are widely used as gas sensors, as their resistivity changes in the presence of reactive gases [29,30]. Nanostructures are attractive as sensing elements owing to their large surface area to volume ratio allowing higher adsorption of gas molecules.…”

Section: Discussionmentioning

confidence: 99%

Studies on Spray Pyrolised Nanostructured SnO2 Thin Films for H2 Gas Sensing Application

Bari¹,

Patil²

2014

ILCPA

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The objective of this work is to study the influence of pyrolysis temperature on structural, surface morphology and gas sensing properties of the nanostructured SnO 2 thin films prepared by spray pyrolysis technique. These films were characterized for the structural, morphological and elemental composition carried by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrophotometer (EDAX). The information of crystallite size, dislocation density and microstrain is obtained from the full width-at half-maximum (FWHM) of the diffraction peaks. Effect of sprayed deposition temperature on H 2 gas sensing performance and electrical properties were studied using static gas sensing system. The sensor (T pyr . = 350 °C) showed high gas response (S = 1200 at 350 °C) on exposure of 500 ppm of H 2 and high selectivity against other gases The results are discussed and interpreted.

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Section: Discussionmentioning

confidence: 99%

Studies on Spray Pyrolised Nanostructured SnO2 Thin Films for H2 Gas Sensing Application

Bari¹,

Patil²

2014

ILCPA

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“…This might be due to the catalytic action of nanostructure LaFeO 3 thin films, which will enhance the reaction between chemisorbed oxygen ions and NO 2 . 39 The sensitivity is highly dependent on film thickness, operating temperature, chemical composition, and crystallite size. Figure 9c and d represents the response and recovery time of LaFeO 3 nanostructure thin films of network and nanocube structures toward 1−5 ppm of NO 2 at RT with an experimental error of ±0.01%.…”

Section: Acs Applied Materials and Interfacesmentioning

confidence: 99%

Surface Morphology-Dependent Room-Temperature LaFeO₃ Nanostructure Thin Films as Selective NO₂ Gas Sensor Prepared by Radio Frequency Magnetron Sputtering

Thirumalairajan

Girija

Mastelaro

et al. 2014

ACS Appl. Mater. Interfaces

136

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In the present work, perovskite LaFeO 3 thin films with unique morphology were obtained on silicon substrate using radio frequency magnetron sputtering technique. The effect of thickness and temperature on the morphological and structural properties of LaFeO 3 films was systematically studied. The X-ray diffraction pattern explored the highly oriented orthorhombic perovskite phase of the prepared thin films along [121]. Electron micrograph images exposed the network and nanocube surface morphology of LaFeO 3 thin films with average sizes of ∼90 and 70 nm, respectively. The developed LaFeO 3 thin films not only possess unique morphology, but also influence the gas-sensing performance toward NO 2 . Among the two morphologies, nanocubes exhibited high sensitivity, good selectivity, fast response−recovery time, and excellent repeatability for 1 ppm level of NO 2 gas at room temperature. The response time for nanocubes was 24−11 s with a recovery duration of 35−15 s less than the network structure. The sensitivity toward NO 2 detection was found to be in the range 29.60−157.89. The enhancement in gassensing properties is attributed to their porous structure, surface morphology, numerous surface active sites, and the oxygen vacancies. The gas-sensing measurements demonstrate that the LaFeO 3 sensing material is an outstanding candidate for NO 2 detection.

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“…Metallic Zn [36][37][38][39][40][41][42][43] or diethylzinc (Et 2 Zn) [44][45][46][47], both with O 2 as carrier (reactive) gas, have been used as precursors for the formation of ZnO via CVD, although other simple precursors such as zinc nitrate (Zn(NO 3 ) 2 ) [48] and organometallic complexes (e.g., Zn(II) ketoiminate) [49,50], have also been reported. ZnO films or NPs have been typically achieved at deposition temperatures between 350 and 450˝C, whereas NS of this material have been reported at deposition temperatures exceeding 450˝C, either with or without the use of gold (catalytic) seeds to encourage NS formation.…”

Section: Zinc Oxidementioning

confidence: 99%

Chemical Vapour Deposition of Gas Sensitive Metal Oxides

et al. 2016

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This article presents a review of recent research efforts and developments for the fabrication of metal-oxide gas sensors using chemical vapour deposition (CVD), presenting its potential advantages as a materials synthesis technique for gas sensors along with a discussion of their sensing performance. Thin films typically have poorer gas sensing performance compared to traditional screen printed equivalents, attributed to reduced porosity, but the ability to integrate materials directly with the sensor platform provides important process benefits compared to competing synthetic techniques. We conclude that these advantages are likely to drive increased interest in the use of CVD for gas sensor materials over the next decade, whilst the ability to manipulate deposition conditions to alter microstructure can help mitigate the potentially reduced performance in thin films, hence the current prospects for use of CVD in this field look excellent.

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Urchin-like ZnO nanorod arrays for gas sensing applications

Cited by 100 publications

References 21 publications

Studies on Spray Pyrolised Nanostructured SnO<sub>2</sub> Thin Films for H<sub>2</sub> Gas Sensing Application

Studies on Spray Pyrolised Nanostructured SnO<sub>2</sub> Thin Films for H<sub>2</sub> Gas Sensing Application

Surface Morphology-Dependent Room-Temperature LaFeO₃ Nanostructure Thin Films as Selective NO₂ Gas Sensor Prepared by Radio Frequency Magnetron Sputtering

Chemical Vapour Deposition of Gas Sensitive Metal Oxides

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Urchin-like ZnO nanorod arrays for gas sensing applications

Cited by 100 publications

References 21 publications

Studies on Spray Pyrolised Nanostructured SnO<sub>2</sub> Thin Films for H<sub>2</sub> Gas Sensing Application

Studies on Spray Pyrolised Nanostructured SnO<sub>2</sub> Thin Films for H<sub>2</sub> Gas Sensing Application

Surface Morphology-Dependent Room-Temperature LaFeO3 Nanostructure Thin Films as Selective NO2 Gas Sensor Prepared by Radio Frequency Magnetron Sputtering

Chemical Vapour Deposition of Gas Sensitive Metal Oxides

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Surface Morphology-Dependent Room-Temperature LaFeO₃ Nanostructure Thin Films as Selective NO₂ Gas Sensor Prepared by Radio Frequency Magnetron Sputtering