Enhancing gas-sensing property and sensing mechanism at molecule level of the hollow microspheres assembled with ZnO nanoflakes exposing {001} facets

Chen, Yan; Liu, Bin; Liu, Junfang; Chen, Pei; Zhao, Hua; Shang, Yonghui; Yang, Heqing

doi:10.1007/s10854-020-03165-5

Cited by 8 publications

(4 citation statements)

References 35 publications

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“…Meanwhile, several reports have focused on the sensing and energy conversion capabilities of ZnO. , Researchers have demonstrated that ZnO has the ability to detect various gases, such as NO 2 , CO, , NH 3 , H 2 S, and EtOH, and can therefore be utilized for monitoring air quality and controlling pollution. Various synthesis methods for developing electronic devices from ZnO nanostructures have been attempted, including thermal oxidation, , wet-chemical, hydrothermal, and sol–gel methods .…”

Section: Methodsmentioning

confidence: 99%

Transparent Electronics for Wearable Electronics Application

Won,

Bang,

Choi

et al. 2023

Chem. Rev.

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Recent advancements in wearable electronics offer seamless integration with the human body for extracting various biophysical and biochemical information for real-time health monitoring, clinical diagnostics, and augmented reality. Enormous efforts have been dedicated to imparting stretchability/flexibility and softness to electronic devices through materials science and structural modifications that enable stable and comfortable integration of these devices with the curvilinear and soft human body. However, the optical properties of these devices are still in the early stages of consideration. By incorporating transparency, visual information from interfacing biological systems can be preserved and utilized for comprehensive clinical diagnosis with image analysis techniques. Additionally, transparency provides optical imperceptibility, alleviating reluctance to wear the device on exposed skin. This review discusses the recent advancement of transparent wearable electronics in a comprehensive way that includes materials, processing, devices, and applications. Materials for transparent wearable electronics are discussed regarding their characteristics, synthesis, and engineering strategies for property enhancements. We also examine bridging techniques for stable integration with the soft human body. Building blocks for wearable electronic systems, including sensors, energy devices, actuators, and displays, are discussed with their mechanisms and performances. Lastly, we summarize the potential applications and conclude with the remaining challenges and prospects.

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Section: Methodsmentioning

confidence: 99%

Transparent Electronics for Wearable Electronics Application

Won,

Bang,

Choi

et al. 2023

Chem. Rev.

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“…Their work reported gas sensing at 15 ppm level [51]. ZnO in the form of nanofiber (1D) [57], nanosheet (2D) [58,59], and microspheres (3D) [60,61] have been also reported as sensing elements for detecting gases. For instance, Du et al [57] reported 1D ZnO nanofiber for sensing acetone with a sensitivity of 125Ra/Rg and a response time of 75 s@100 ppm.…”

Section: Literature Surveymentioning

confidence: 99%

“…3D ZnO microspheres has been reported to detect ethanol and acetone gases. Chen et al [60] has reported a ZnO microsphere based ethanol gas sensor with a response time and sensitivity of 1 s@2 ppm and 1.66 Ra/Rg respectively at a temperature of 350 °C. Recently, Shi et al [61] reported an acetone gas sensor with a sensitivity of 36Ra/Rg and a response time of 1 s@ 100 ppm.…”

Section: Literature Surveymentioning

confidence: 99%

Recent Advances in ZnO Based Electrochemical Ethylene Gas Sensors for Evaluation of Fruit Maturity

Mathew

Das

2021

Springer Proceedings in Materials

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India is the largest producer of fruits and vegetables in the world. However, a major portion of agro-products is wasted during harvesting, shipping, and storage, i.e., negligence in the food supply chain management (FSCM) system. Globally, one third of food produced is wasted. Importantly, two-third of the wastage of food occurs due to limitations in the supply chain management system. Wastage of perishable agro-products due to negligence in FSCM is a critical issue, especially in the case of agro-products like fruit. Therefore, the early detection and segregation of fruits are critical to reduce agro-product wastage. A typical indicator of maturity and ripening of fruits is the rate of generation and concentration of ethylene gas. Even though, literature encompasses examples of a variety of ethylene gas sensors, ZnO based electrochemical ethylene gas sensors depict numerous advantages compared to other sensor variants. ZnO is an extensively studied wide band gap semiconductor for sensing applications. When used as a sensing layer material it 'senses', ethylene gas by changing its band gap and thereby electrical property. Further, the sensitivity and selectivity of the pristine ZnO vary with shape, substrate, and metal doping. This paper elucidates a review of recent advances in ZnO based electrochemical sensors for ethylene gas detection. The review covers various levels of design abstraction that include material and device. In addition, we summarize the design challenges and future trends in the development of ZnO based electrochemical ethylene gas sensors.

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“…Currently, some researchers have used density function theory (DFT) to analyze the semiconductor-based gas sensing properties and successfully explained the experimental results [1,16]. However, most calculations mainly focus on specific new materials in terms of doping or surface functioning; few contribute to the facet-dependent selectivity, even though it has been extensively studied by experiments due to ease of control and apparent structure selectivity correlations [15,17,18].…”

Section: Introductionmentioning

confidence: 99%

Facet-Dependent Gas Adsorption Selectivity on ZnO: A DFT Study

et al. 2022

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Semiconductor-based gas sensors are of great interest in both industrial and research settings, but poor selectivity has hindered their further development. Current efforts including doping, surface modifications and facet controlling have been proved effective. However, the “methods-selectivity” correlation is ambiguous because of uncontrollable defects and surface states during the experiments. Here, as a case study, using a DFT method, we studied the adsorption features of commonly tested gases—CH2O, H2, C2H5OH, CH3COCH3, and NH3—on facets of ZnO(0001¯), ZnO(101¯0) and ZnO(101¯1). The adsorption energies and charge transfers were calculated, and adsorption selectivity was analyzed. The results show ZnO(0001¯) has obvious CH2O adsorption selectivity; ZnO(101¯0) has a slight selectivity to C2H5OH and NH3; and ZnO(101¯1) has a slight selectivity to H2, which agrees with the experimental results. The mechanism of the selective adsorption features was studied in terms of polarity, geometric matching and electronic structure matching. The results show the adsorption selectivity is attributed to a joint effort of electronic structure matching and geometric matching: the former allows for specific gas/slab interactions, the latter decides the strength of the interactions. As the sensing mechanism is probably dominated by gas–lattice interactions, this work is envisioned to be helpful in designing new sensing material with high selectivity.

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Enhancing gas-sensing property and sensing mechanism at molecule level of the hollow microspheres assembled with ZnO nanoflakes exposing {001} facets

Cited by 8 publications

References 35 publications

Transparent Electronics for Wearable Electronics Application

Transparent Electronics for Wearable Electronics Application

Recent Advances in ZnO Based Electrochemical Ethylene Gas Sensors for Evaluation of Fruit Maturity

Facet-Dependent Gas Adsorption Selectivity on ZnO: A DFT Study

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