ZnO hierarchical 3D-flower like architectures and their gas sensing properties at room temperature

Ganesh, R. Sankar; Mani, Ganesh Kumar; Elayaraja, R.; Elamaran, Durgadevi; Navaneethan, M.; Ponnusamy, S.; Tsuchiya, Kazuyoshi; Muthamizhchelvan, C.; Hayakawa, Y.

doi:10.1016/j.apsusc.2018.01.199

Cited by 35 publications

(18 citation statements)

References 54 publications

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“…The majority of the single phase n-type SMONs without modifications by other elements can be used for NH 3 gas sensors, including ZnO, [210][211][212] 78 Du et al 111 reported a RT NH 3 gas sensor using porous In 2 O 3 nanotubes. This gas sensor exhibits an ultra-high response value of 2500 and good reproducibility with response and recovery times less than 20 s, both of which are better than those of the sensors made of In 2 O 3 nanowires or nanoparticles.…”

Section: Yongqing Fumentioning

confidence: 99%

Advances in designs and mechanisms of semiconducting metal oxide nanostructures for high-precision gas sensors operated at room temperature

et al. 2019

Mater. Horiz.

558

328

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Section: Yongqing Fumentioning

confidence: 99%

Advances in designs and mechanisms of semiconducting metal oxide nanostructures for high-precision gas sensors operated at room temperature

et al. 2019

Mater. Horiz.

558

328

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“…The hierarchical architecture feature of the nest‐like structure (nanowall) has a very promising sensor application due to its very high surface‐to‐volume ratio; thus a high surface area for gas diffusion and therefore expected to have a good electrical response for sensor applications . The gas‐sensing capability of a good sensor is largely affected by the particle size and surface morphology.…”

Section: Resultsmentioning

confidence: 99%

“…Zinc oxide (ZnO) is a well‐known and remarkable semiconductor due to its wide 3.37 eV‐bandgap and 60 meV‐exciton binding energy, which are relatively higher than other semiconductors. It has therefore enormous potential for practical applications in optoelectronics industry such in the areas of perovskite and dye‐sensitized solar cells, photocatalysts, and gas sensors . Furthermore, hierarchical ZnO nanostructures have been reported to exhibit fascinating optical and catalytic properties due to their unique designs that offers large surface‐to‐volume ratio suitable for gas‐sensing, high photosensitivity for catalysis applications and excellent electrical properties for electrical transport properties for dye‐sensitized and perovskite solar cells …”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, novel ZnO nanostructures, such as the 2D/3D nanowalls and grown using different techniques, have been intensively studied and explored for practical and potential applications in dye‐sensitized and perovskite‐type solar cells, energy storage devices, inverted polymer solar cells (IPSCs) and chemical and biological sensors due to their improved photoluminescence (PL) properties and high surface‐to‐volume surface ratio that offers a good advantage over thin films …”

Section: Introductionmentioning

confidence: 99%

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Designing zinc oxide nanostructures (nanoworms, nanoflowers, nanowalls, and nanorods) by pulsed laser ablation technique for gas‐sensing application

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In this study, pulsed laser ablation technique, also known as pulsed laser deposition (PLD), is used to design and grow zinc oxide (ZnO) nanostructures (nanoworms, nanowalls, and nanorods) by template/seeding approach for gas-sensing applications. Conventionally, ZnO nanostructures used for gas-sensing have been usually prepared via chemical route, where the 3D/2D nanostructures are chemically synthesized and subsequently plated on an appropriate substrate. However, using pulsed laser ablation technique, the ZnO nanostructures are structurally designed and grown directly on a substrate using a two-step temperature-pressure seeding approach. This approach has been optimized to design various ZnO nanostructures by understanding the effect of substrate temperature in the 300-750°C range under O 2 gas pressure from 10-mTorr to 10 Torr. Using a thin ZnO seed layer as template that is deposited first at substrate temperature of~300°C at background oxygen pressure of 10 mTorr on Si(100), ZnO nanostructures, such as nanoworms, nanowalls, and nanorods (with secondary flower-like growth) were grown at substrate temperatures and oxygen background pressures of (550°C and 2 Torr), (550°C and 0.5 Torr), and (650°C and 2 Torr), respectively. The morphology and the optical properties of ZnO nanostructures were examined by Scanning Electron Microscope (SEM-EDX), X-ray Diffraction (XRD), and photoluminescence (PL). The PLDgrown ZnO nanostructures are single-crystals and are highly oriented in the c-axis. The vapor-solid (VS) model is proposed to be responsible for the growth of ZnO nanostructures by PLD process. Furthermore, the ZnO nanowall structure is a very promising nanostructure due to its very high surface-to-volume ratio. Although ZnO nanowalls have been grown by other methods for sensor application, to this date, only a very few ZnO nanowalls have been grown by PLD for this purpose. In this regard, ZnO nanowall structures are deposited by PLD on an Al 2 O 3 test sensor and assessed for their responses to CO and ethanol gases at 50 ppm, where good responses were observed at 350 and 400°C, respectively. The PLD-grown ZnO nanostructures are very excellent materials for potential applications such as in dyesensitized solar cells, perovskite solar cells and biological and gas sensors.

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“…( a , b ) 1-D as the building unit of 3-D ZnO [134,135]; ( c , d ) 2-D as the building unit of ZnO [136,137]; ( e ) hollow sphere [138]; ( f ) nanoflower grown on an alumina substrate [139]. Reproduced with permission from: ( a ) Ref.…”

Section: Figurementioning

confidence: 99%

Electrochemical-Based Biosensors on Different Zinc Oxide Nanostructures: A Review

et al. 2019

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Electrochemical biosensors have shown great potential in the medical diagnosis field. The performance of electrochemical biosensors depends on the sensing materials used. ZnO nanostructures play important roles as the active sites where biological events occur, subsequently defining the sensitivity and stability of the device. ZnO nanostructures have been synthesized into four different dimensional formations, which are zero dimensional (nanoparticles and quantum dots), one dimensional (nanorods, nanotubes, nanofibers, and nanowires), two dimensional (nanosheets, nanoflakes, nanodiscs, and nanowalls) and three dimensional (hollow spheres and nanoflowers). The zero-dimensional nanostructures could be utilized for creating more active sites with a larger surface area. Meanwhile, one-dimensional nanostructures provide a direct and stable pathway for rapid electron transport. Two-dimensional nanostructures possess a unique polar surface for enhancing the immobilization process. Finally, three-dimensional nanostructures create extra surface area because of their geometric volume. The sensing performance of each of these morphologies toward the bio-analyte level makes ZnO nanostructures a suitable candidate to be applied as active sites in electrochemical biosensors for medical diagnostic purposes. This review highlights recent advances in various dimensions of ZnO nanostructures towards electrochemical biosensor applications.

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ZnO hierarchical 3D-flower like architectures and their gas sensing properties at room temperature

Cited by 35 publications

References 54 publications

Advances in designs and mechanisms of semiconducting metal oxide nanostructures for high-precision gas sensors operated at room temperature

Advances in designs and mechanisms of semiconducting metal oxide nanostructures for high-precision gas sensors operated at room temperature

Designing zinc oxide nanostructures (nanoworms, nanoflowers, nanowalls, and nanorods) by pulsed laser ablation technique for gas‐sensing application

Electrochemical-Based Biosensors on Different Zinc Oxide Nanostructures: A Review

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