The crystal facet-dependent gas sensing properties of ZnO nanosheets: Experimental and computational study

Xu, Jiaqiang; Xue, Zhenggang; Qin, Nan; Cheng, Zhong; Xiang, Qun

doi:10.1016/j.snb.2016.09.193

Cited by 209 publications

(82 citation statements)

References 56 publications

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“…they further suggested that the (001) surface was highly reactive for the adsorption of active oxygen species, which was responsible for the enhanced sensing performance. As regards ZnO, the dominating exposed crystal facets of these nanostructures are usually {1010}, because of the natural instinct of ZnO nanocrystals to grow along the c-axis direction [34]. Although it is difficult to synthesize ZnO with unconventional growth directions, it is possible that a particular synthesis method could make it happen.…”

Section: Zno Exposed Crystal Planes and Sensing Behaviormentioning

confidence: 99%

“…Because the absorption of active species on crystalline surfaces is related to energy aspects, the higher the reduction of energy, the stronger will be the chemisorption of molecules. Therefore, a higher number of dangling bonds can result in an improvement of the sensing performance of the material [34].…”

Section: Zno Exposed Crystal Planes and Sensing Behaviormentioning

confidence: 99%

“…More recently, Xu et al [34] by facile hydrothermal routes, synthesized two porous ZnO nanosheets with different exposed facets. The synthesized nanosheets had similar specific surface areas of about 7.5 m 2 /g, thickness about 100 nm, lateral size about 5 µm, and pore size of 10 nm; however, their dominating exposed crystal facets were (0001) and (101 ̅ 0), respectively (Figure 3a-d).…”

Section: Ethanolmentioning

confidence: 99%

“…These, favoring the adsorption of gas molecules onto the material surface, resulted in the improvement of the gas response to ethanol. Reprinted from [34] with permission from Elsevier.…”

Section: Ethanolmentioning

confidence: 99%

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Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Leonardi

2017

Chemosensors

153

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Two-dimensional (2D) nanomaterials, due to their unique physical and chemical properties, are showing great potential in catalysis and electronic/optoelectronic devices. Moreover, thanks to the high surface to volume ratio, 2D materials provide a large specific surface area for the adsorption of molecules, making them efficient in chemical sensing applications. ZnO, owing to its many advantages such as high sensitivity, stability, and low cost, has been one of the most investigated materials for gas sensing. Many ZnO nanostructures have been used to fabricate efficient gas sensors for the detection of various hazardous and toxic gases. This review summarizes most of the research articles focused on the investigation of 2D ZnO structures including nanosheets, nanowalls, nanoflakes, nanoplates, nanodisks, and hierarchically assembled nanostructures as a sensitive material for conductometric gas sensors. The synthesis of the materials and the sensing performances such as sensitivity, selectivity, response, and recovery times as well as the main influencing factors are summarized for each work. Moreover, the effect of mainly exposed crystal facets of the nanostructures on sensitivity towards different gases is also discussed.

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Section: Zno Exposed Crystal Planes and Sensing Behaviormentioning

confidence: 99%

Section: Zno Exposed Crystal Planes and Sensing Behaviormentioning

confidence: 99%

Section: Ethanolmentioning

confidence: 99%

“…These, favoring the adsorption of gas molecules onto the material surface, resulted in the improvement of the gas response to ethanol. Reprinted from [34] with permission from Elsevier.…”

Section: Ethanolmentioning

confidence: 99%

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Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Leonardi

2017

Chemosensors

153

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“…A whole variety of ways have been applied for ZnO materials to quickly and effectively monitor the target gas. [11][12][13][14] In order to improve the gas sensing performance, the design and synthesis of ordered ZnO 3D hierarchical architectures are expected because of large special surface area, low effective density, good surface permeability. [15] These kinds of structures can facilitate gas diffusion and fast mass transport in ZnO sensing material, and prevent the aggregation of nanosized building blocks, thus contributing both the high gas response and rapid respond speed simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Trimethylamine Sensing Performance of PdO‐Decorated ZnO Flower‐Like Structures Synthesized by One‐ Step Hydrothermal Method

et al. 2019

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ZnO and PdO‐decorated ZnO flower‐like structures have been synthesized using a facile one‐step hydrothermal method followed by subsequent calcination. Then, their structural information and trimethylamine (TMA) sensing performance were investigated. The results exhibited that the diameter of these ZnO flower‐like structures was in the range of 3–7 μm. Its morphology was maintained after introducing PdO nanoparticales. By comparing the sensing properties, it is found that sensors based on PdO‐decorated ZnO flower‐like structures showed higher TMA response than that of pure one. Especially, the sensor fabricated by 1 mol% PdO‐decorated ZnO flower‐like structures displayed superior gas sensing performances including high response, rapid response/recover characteristics, good stability, and high selectivity. Such a superior sensing performance is mainly due to the chemical and electrical sensitization of PdO nanoparticles. This simple synthesis strategy and a desirable TMA sensing performance could be broadly developed other metallic doped metal oxide flower‐like structures as high performance sensing materials.

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Oxygen Vacancies Engineering in Thick Semiconductor Films via Deep Ultraviolet Photoactivation for Selective and Sensitive Gas Sensing

Abideen

Choi

Yuwono

et al. 2023

Adv Elect Materials

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Room‐temperature detection of volatile organic compounds in particle‐per‐billion concentrations is critical for the development of wearable and distributed sensor networks. However, sensitivity and selectivity are limited at low operating temperatures. Here, a strategy is proposed to substantially improve the performance of semiconductor sensors. Tunable oxygen vacancies in thick 3D networks of metal oxide nanoparticles are engineered using deep ultraviolet photoactivation. High selectivity and sensitivity are achieved by optimizing the electronic structure and surface activity while preserving the 3D morphology. Cross‐sectional depth analysis reveals oxygen vacancies present at various depths (≈24% at a depth of 1.13 µm), with a uniform distribution throughout the thick films. This results in ≈58% increase in the sensitivity of ZnO to 20‐ppb ethanol at room temperature while ≈51% and 64% decrease in the response and recovery times, respectively. At an operating temperature of 150 °C, oxygen‐vacant nanostructures achieve a lower limit of detection of 2 ppb. Density functional theory analysis shows that inducing oxygen vacancies reduces activation energy for ethanol adsorption and dissociation, leading to improved sensing performance. This scalable approach has the potential for designing low‐power wearable chemical and bio‐sensors and tuning the activity and band structure of porous, thick oxide films for multiple applications.

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The crystal facet-dependent gas sensing properties of ZnO nanosheets: Experimental and computational study

Cited by 209 publications

References 56 publications

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Investigation on Trimethylamine Sensing Performance of PdO‐Decorated ZnO Flower‐Like Structures Synthesized by One‐ Step Hydrothermal Method

Oxygen Vacancies Engineering in Thick Semiconductor Films via Deep Ultraviolet Photoactivation for Selective and Sensitive Gas Sensing

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