NO2 sensing properties of one-pot-synthesized ZnO nanowires with Pd functionalization

Chen, Xiangxiang; Shen, Yanbai; Zhou, Pengfei; Zhao, Sikai; Zhong, Xiangxi; Li, Tingting; Han, Cong; Wei, Dezhou; Meng, Dan

doi:10.1016/j.snb.2018.10.063

Cited by 163 publications

(39 citation statements)

References 51 publications

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“…Additionally, the photocatalytic behavior of ZnO NPs complements their antimicrobial efficiencies. [47][48][49] Pulsed laser deposition 2019 [25] Nanowires: diameter, 100-250 nm; length, 2-10 μm Hydrothermal 2019 [26] N-Ag-TiO 2 -ZnO nanocages Polymerization-assisted assembly 2019 [27] Aligned ZnO nanorods Hydrothermal 2019 [28] 3D hierarchical micro-flowers made up of nanosheets (diameter ∼2-3 μm)…”

Section: Synthesis Techniquesmentioning

confidence: 99%

ZnO Nanostructures in Active Antibacterial Food Packaging: Preparation Methods, Antimicrobial Mechanisms, Safety Issues, Future Prospects, and Challenges

Kim

Karthika

Gopinath

et al. 2020

Food Reviews International

255

119

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Packaging of food products is one of the most important stages of the food supply chain. Nano-size materials for packing food substances with appropriate properties result in better packaging performance and longer food shelf-life. In this review, the application of ZnO nano-size in active packaging of foods is discussed to identify gaps in applications for food packaging and safety. First, the crystal structures and morphologies of modified ZnO nanoparticles (ZnO NPs) are presented, and their synergistic effects on antimicrobial activities are discussed. This review also provides an overview of antimicrobial packaging containing ZnO NPs with a focus on preparation methods, antimicrobial mechanisms, and recent progress in packaging applications. The generation of reactive oxygen species (ROS) is the primary antimicrobial mechanism, which can be varied depending on morphology and size. Generally, ZnO NPs can inactivate fungi or Gram-positive and Gram-negative bacteria growth, which reduce the risk of cross-contamination, thereby extending the shelf life of products. Notably, the health concerns and hazards regarding the safety and migration of ZnO NPs application are also elaborated. Unintentional migration, inhalation, skin penetration, and ingestion may result in human health hazards. Therefore, to provide safety regulations, further investigations such as case by case study are recommended. KEYWORDSZinc oxide nanostructure; shelf life; safety; antimicrobial activity; food packaging CONTACT Jongchul Seo

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Section: Synthesis Techniquesmentioning

confidence: 99%

ZnO Nanostructures in Active Antibacterial Food Packaging: Preparation Methods, Antimicrobial Mechanisms, Safety Issues, Future Prospects, and Challenges

Kim

Karthika

Gopinath

et al. 2020

Food Reviews International

255

119

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“…Apart from gas sensing, ZnO has attracted high technological applications, like photodetectors, photodiodes, surface acoustic wave filters, solar cells, photonic crystals, LEDs, optical waveguides, due to its wide direct band gap (3.3 eV) and large excitation binding energy (60 meV) [6][7][8][9][10][11][12]. In the state of the art, doping of noble metals like gold (Au), platinum (Pt), ruthenium (Ru), nickel (Ni), palladium (Pd), gallium (Ga), silver (Ag) and their combinations showed significant improvement in ZnO-based gas sensor [13][14][15][16][17][18][19][20]. The loading of these noble metals into parent metal oxide amplifies the charge transfer mechanism.…”

Section: Introductionmentioning

confidence: 99%

Development of Ag/ZnO nanorods and nanoplates at low hydrothermal temperature and time for acetone sensing application: an insight into spillover mechanism

et al. 2019

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Nanostructure synthesis at low temperature with high purity and yield has a great potential in the present competitive research and development of nanomaterials for varieties of application. Here, we demonstrate the facile hydrothermal synthesis of ZnO nanocomposites at low hydrothermal temperature and time. With barely 80 °C hydrothermal temperature and 2 h of reaction time, ZnO nanorods were successfully synthesized, while by slightly increasing the reaction time (6 h-and-on), nanoplates of the same material were developed. Both the obtained nanostructures were analyzed using physio-chemical characterizing tools and examined for practical relevance as gas sensing material. The optimized sample was further treated to Ag loading (1-5 mol%) for lowering the operating temperature of the sensor. ZnO sample with 3 mol% Ag loading showed excellent sensitivity of 92.7% for 1000 ppm of acetone concentration with a drop in the operating temperature from 325 °C (Pristine ZnO) to 250 °C (Ag-loaded ZnO). The morphological correlation with reaction time and thereby sensitivity and spillover mechanism are discussed. Graphic abstractKeywords Composite materials · Hydrothermal process · Ag/ZnO · Sensors · Acetone However, in the present industrial scenario, chemical synthesis of these nanomaterials is facing enormous challenges in terms of trimming the overall process span and production at low temperature. Though hydrothermal synthesis route offers decent advantages over conventional synthesis routes, its high reaction temperature (hence high pressure) and longer reaction time are the major concerns at pilot/industrial-scale production. However, by effective tuning of reaction temperature in combination with the reaction time, one can get the same nanomaterial in the desired morphology. Here, the problem addressed in the paper is to ease the high temperature and time-consuming process for synthesizing ZnO-based nanostructures. The efforts were made to custom tailor the ZnO nanostructures at lower hydrothermal temperature (80 °C) and shorter reaction time (2-10 h). With barely 80 °C hydrothermal temperature and 2 h of reaction time, ZnO nanorods were successfully synthesized, while by slightly increasing the reaction time (6 h-and-on), nanoplates of the same material were developed. The obtained nanostructures are Compliance with ethical standardsConflict of interest The authors declare that there is no competing interest whatsoever.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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“…Thus, the development of NO 2 gas sensors with high sensitivity and low detect limitation is urgently necessary. At present, metal oxide semiconductors with various nanostructures, such as SnO 2 [3][4][5], ZnO [6,7], WO 3 [8,9], and TiO 2 [10], have been well investigated to detect NO 2 owing to their low cost, simple operation, and nontoxic nature. Among them, tungsten oxide, a n-type semiconductor with wide bandgap (2.6-3.2 eV), has been considered as a promising sensing material for the detection of NO 2 because of its low cost, high sensitivity, and good repeatability [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Nanowires-assembled WO3 nanomesh for fast detection of ppb-level NO2 at low temperature

Liu

Ren

et al. 2020

J Adv Ceram

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Hierarchical WO 3 nanomesh, assembled from single-crystalline WO 3 nanowires, is prepared via a hydrothermal method using thiourea (Tu) as the morphology-controlling agent. Formation of the hierarchical architecture comprising of WO 3 nanowires takes place via Ostwald ripening mechanism with the growth orientation. The sensor based on WO 3 nanomesh has good electrical conductivity and is therefore suitable as NO 2 sensing material. The WO 3 nanomesh sensor exhibited high response, short response and recovery time, and excellent selectivity towards ppb-level NO 2 at low temperature of 160 ℃. The superior gas performance of the sensor was attributed to the high-purity hexagonal WO 3 with high specific surface area, which gives rise to enhanced surface adsorption sites for gas adsorption. The electron depletion theory was used for explaining the NO 2 -sensing mechanism by the gas adsorption/desorption and charge transfer happened on the surface of WO 3 nanomesh.

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NO2 sensing properties of one-pot-synthesized ZnO nanowires with Pd functionalization

Cited by 163 publications

References 51 publications

ZnO Nanostructures in Active Antibacterial Food Packaging: Preparation Methods, Antimicrobial Mechanisms, Safety Issues, Future Prospects, and Challenges

ZnO Nanostructures in Active Antibacterial Food Packaging: Preparation Methods, Antimicrobial Mechanisms, Safety Issues, Future Prospects, and Challenges

Development of Ag/ZnO nanorods and nanoplates at low hydrothermal temperature and time for acetone sensing application: an insight into spillover mechanism

Nanowires-assembled WO3 nanomesh for fast detection of ppb-level NO2 at low temperature

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