Defect-related photoluminescence and photocatalytic properties of porous ZnO nanosheets

Liu, Di; Lv, Yanhui; Zhang, Mo; Liu, Yanfang; Zhu, Yuelin; Zong, Ruilong; Zhu, Yongfa

doi:10.1039/c4ta02678k

Cited by 283 publications

(126 citation statements)

References 80 publications

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“…ii. High specific surface area is beneficial for catalytic performance and some ZnO morphologies with meporous structures have been reported in the applications of catalysis [142,207,240,249]. However, this is a challenge because the morphology controlled synthesis may be destroyed by pore-forming materials and more research should be carried out.…”

Section: Discussionmentioning

confidence: 99%

“…Besides, well-built 2-dimentional nanostructures with boundaries on nanoplates are favorable for advanced optical properties and enhanced photo-catalytic properties. Porous ZnO nanosheets with a high surface area near-rectangular morphology have been successfully prepared by Liu et al [249]. The samples showed good activities for photo-degradation of phenol under UV light irradiation.…”

Section: Photo-degradation Of Phenol and Other Pollutantsmentioning

confidence: 99%

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The Applications of Morphology Controlled ZnO in Catalysis

et al. 2016

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Zinc oxide (ZnO), with the unique chemical and physical properties of high chemical stability, broad radiation absorption range, high electrochemical coupling coefficient, and high photo-stability, is an attractive multifunctional material which has promoted great interest in many fields. What is more, its properties can be tuned by controllable synthesized morphologies. Therefore, after the success of the abundant morphology controllable synthesis, both the morphology-dependent ZnO properties and their related applications have been extensively investigated. This review concentrates on the properties of morphology-dependent ZnO and their applications in catalysis, mainly involved reactions on green energy and environmental issues, such as CO 2 hydrogenation to fuels, methanol steam reforming to generate H 2 , bio-diesel production, pollutant photo-degradation, etc. The impressive catalytic properties of ZnO are associated with morphology tuned specific microstructures, defects or abilities of electron transportation, etc. The main morphology-dependent promotion mechanisms are discussed and summarized.

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Section: Discussionmentioning

confidence: 99%

Section: Photo-degradation Of Phenol and Other Pollutantsmentioning

confidence: 99%

The Applications of Morphology Controlled ZnO in Catalysis

et al. 2016

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“…Şekil 8'de görülebileceği gibi tüm örneklerde 422, 458, 484 ve 529 nm civarında dört temel emisyon piki gözlenmiştir. 422 nm'de (2.94 eV) gözlenen menekşe rengi bölgesine karşılık gelen emisyon çinko arayer atom elektronlarının valans bandına geçişlerini göstermektedir [28][29]. 458 nm (2.71 eV) civarındaki mavi emisyon ZnO kafes yapısındaki oksijen atomu boşluklarından ileri geldiği öne sürülmüştür [30].…”

Section: Materyal Ve Metotunclassified

“…458 nm (2.71 eV) civarındaki mavi emisyon ZnO kafes yapısındaki oksijen atomu boşluklarından ileri geldiği öne sürülmüştür [30]. Bazı kaynaklarda ise çinko boşluklarından dolayı olduğu belirtilmiştir [28][29]. Oksijen arayer ve boşlukları arasındaki elektron geçişleri ve oksijen ve çinko boşluklarıyla ortaya çıkan kafes kusurları 484 nm'de (2.56 eV) gözlenen emisyona karşılık gelmektedir [29][30].…”

Section: Materyal Ve Metotunclassified

“…Bazı kaynaklarda ise çinko boşluklarından dolayı olduğu belirtilmiştir [28][29]. Oksijen arayer ve boşlukları arasındaki elektron geçişleri ve oksijen ve çinko boşluklarıyla ortaya çıkan kafes kusurları 484 nm'de (2.56 eV) gözlenen emisyona karşılık gelmektedir [29][30]. 529 nm'de (2.34 eV) gözlenen karakteristik yeşil emisyon ise ZnO yüzeyine yakın çinko ve oksijen atomlarındaki arayer ve boşluk kusurları dolayısıyladır [28].…”

Section: Materyal Ve Metotunclassified

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L-Sistein Derişimine Bağlı ?-Zn(OH)2 Oluşumu ve Kalsinasyon Ürünleri Olarak Farklı Morfolojideki ZnO Yapıları

Top¹

2018

deufmd

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Structural characterization of the precipitation products of zinc nitrate and sodium hydroxide obtained using L-cysteine additive was carried out. XRD analysis showed that -Zn(OH)2 crystal structure formed in the synthesis condition where L-cysteine:zinc molar ratio was 0.165:1. Plate-like morphology, was oberved in the SEM micrograph of this sample. No crystal structure was apparent upon increasing L-cysteine:zinc ratio ten fold. L-cysteine contents of the samples synthesized at low and high L-cysteine:zinc ratios were calculated as 6.0 % and 38.4 %, respectively. Calcination of both samples at 700 o C for 2 hours yielded formation of ZnO. In the UV-Vis spectra of the ZnO samples two peaks were observed at 329 nm and 381 nm. Crystal defects of these samples were determined via PL spectroscopy.

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A Multiresponsive Metal–Organic Framework: Direct Chemiluminescence, Photoluminescence, and Dual Tunable Sensing Applications

Yang

Chen

Hou

et al. 2015

Adv Funct Materials

101

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By incorporating an anthracene moiety into a framework, a multiresponsive luminescent metal–organic framework (1) has been synthesized, which exhibits both direct chemiluminescence (CL) and dual tunable photoluminescence. By utilizing the CL, 1 has been explored as a selective visual sensor for hydrogen peroxide. Moreover, 1 also exhibits tunable fluorescence response toward different analytes. For electron‐rich aromatics, “turn‐on” and “turn‐off” responses can be simply switched by varying the excitation wavelength. For nitroaromatics, 1 exhibits novel linear quantitative quenching response. Density functional theory (DFT) calculations and experiments have been carried out to study the unique fluorescence response. The multiple luminescence properties and dual tunable sensing response indicate that incorporating anthracene moieties into frameworks should be a promising strategy to develop unprecedented luminescent materials with remarkable sensing properties.

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Defect-related photoluminescence and photocatalytic properties of porous ZnO nanosheets

Cited by 283 publications

References 80 publications

The Applications of Morphology Controlled ZnO in Catalysis

The Applications of Morphology Controlled ZnO in Catalysis

L-Sistein Derişimine Bağlı ?-Zn(OH)2 Oluşumu ve Kalsinasyon Ürünleri Olarak Farklı Morfolojideki ZnO Yapıları

A Multiresponsive Metal–Organic Framework: Direct Chemiluminescence, Photoluminescence, and Dual Tunable Sensing Applications

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