ZnO quantum dots decorated 3DOM TiO2 nanocomposites: Symbiose of quantum size effects and photonic structure for highly enhanced photocatalytic degradation of organic pollutants

Zalfani, Meryam; Schueren, Benoit Van der; Mahdouani, M.; Bourguiga, R.; Yu, Wen-Bei; Wu, Min; Deparis, Olivier; Liu, Yu; Su, Bao‐Lian

doi:10.1016/j.apcatb.2016.06.016

Cited by 98 publications

(34 citation statements)

References 91 publications

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“…Such a sandwich-structured PC design has much-increased light trapping effect, which can give rise to the extraordinary light absorbance of the TiO 2 without adding metallic materials such as gold, silver, aluminium and graphene or CdS Inverse Opals. [28][29][30][31][32] Moreover, we also observed an extended electron-hole lifetime in TiO 2 entirely owing to the light manipulation in S-IO-TiO 2 .…”

Section: Introductionsupporting

confidence: 53%

Sandwich-structured TiO₂ inverse opal circulates slow photons for tremendous improvement in solar energy conversion efficiency

et al. 2017

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To cite this version:Photon management has enabled a true revolution in the development of high-performance semiconductor materials and devices. Harnessing the highest amount of energy from photon relies on an ability to design and fashion structures to trap the light for the longer time inside the device for more electron excitation. The light harvesting efficiency in many thin-film optoelectronic devices is limited due to low photon absorbance. Here we demonstrate for the first time that slow photon circulation in sandwich-structured photonic crystals with two stopbands fine tuned are ideally suited to enhance and spectrally engineer light absorption. The sandwich-structured TiO 2 inverse opal possesses two stopbands, whose blue or red edge is respectively tuned to overlap with TiO 2 electronic excitation energy, thereby circulating the slow photons in the middle layer and enhancing light scattering at layer interfaces. This concept, together with the significantly increased control over photon management opens up tremendous opportunities for the realization of a wide range of highperformance, optoelectronic devices, and photochemical reactions.

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Section: Introductionsupporting

confidence: 53%

Sandwich-structured TiO₂ inverse opal circulates slow photons for tremendous improvement in solar energy conversion efficiency

et al. 2017

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“…The PL spectrum of the pure colloidal ZnO NPs is presented in Figure a, in which two main emission peaks located at 381 nm (≈3.25 eV) and 361 nm (≈3.43 eV) can be identified. The first peak can be ascribed to the recombination of free excitons close to band edge and the second peak with higher energy is caused by quantum confinement effect from a fraction of small‐sized ZnO QDs . A weak shoulder around 450 nm can be identified, which can be attributed to ionized oxygen vacancies .…”

Section: Resultsmentioning

confidence: 99%

“…The first peak can be ascribed to ther ecombination of free excitons close to band edge and the second peak with higher energy is caused by quantum confinemente ffect from af raction of small-sized ZnO QDs. [59,60] Aweak shouldera round 450 nm can be identified, which can be attributed to ionized oxygen vacancies. [61] As showni nF igure 5b,t he PL emission of pristine MoS 2 nanosheets has apeak at 404 nm, which is attributed to the hot PL from the Kp oint of the Brillouin zone.…”

Section: Opticalproperty Studiesmentioning

confidence: 99%

Facile and Cost‐Efficient Synthesis of Quasi‐0D/2D ZnO/MoS₂ Nanocomposites for Highly Enhanced Visible‐Light‐Driven Photocatalytic Degradation of Organic Pollutants and Antibiotics

Islam

Hang

Chen

et al. 2018

Chemistry A European J

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Nanoscale transition-metal dichalcogenide materials showed promising potential for visible-light responsive photocatalysis. Here, we report our investigations on the synthesis of heterodimensional nanostructures of two-dimensional (2D) ultrathin MoS nanosheets interspersed with ZnO nanoparticles by using a facile two-step method consisting of sonication-aided exfoliation technique followed by a wet chemical process. The photocatalytic activity of the nanocomposites was examined by studying the degradation of different organic dye pollutants and tetracycline, a common antibiotic, under visible-light irradiation. It is found that within 30 min more than 90 % of the model organic dye was photodegraded by the optimized quasi-0D/2D hybrid nanomaterial. The reaction rate of pollutant degradation is about five and eight times higher than those of the pristine MoS naonosheets and P25 photocatalysts, respectively. The outstanding photocatalytic activity of the heterodimensional hybrids can be attributed to a few beneficial features from the synergetic effects. Most importantly, the intimate junction between ZnO and MoS facilitates the separation of photogenerated carriers, leading to the enhancement of photocatalytic efficiency. A tentative photocatalytic degradation mechanism was proposed and tested. Overall, the present work provides valuable insights for the exploration of cost-effective nanoscale heterodimensional hybrids constructed from atomically thin layered materials.

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“…0D nanoparticle refers to spheres with a dimension less than 100 nm . As rarely mentioned before due to the difficulty in uncontrollable reaction process, typical technologies to prepare 0D TiO 2 will be described next.…”

Section: Design Of Crystal and Morphology (Multidimensional) Structurmentioning

confidence: 99%

Light‐Driven Sustainable Hydrogen Production Utilizing TiO₂ Nanostructures: A Review

et al. 2018

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As a promising alternative clean energy to fossil fuels, H2 has been given increasing attention, and efficient H2 production is urgently required. Photocatalytic H2 generation from water splitting (WS) is deemed to be a promising and green route for H2 production. TiO2 has been widely utilized in WS owing to the stability, low cost, corrosion resistance, and environmental safety properities. Nevertheless, two dominant defects (inferior absorption performance in visible light and recombination of photogenerated e−–h+ pairs) still impede the development of TiO2. This review offers a comprehensive overview of the progress of various routes for TiO2 nanostructures (0D–3D) and diversified modifications for enhanced H2 production. Further, the perspectives and opportunities for TiO2 based materials are promoted. Persistent efforts are needed to equip the TiO2 nanomaterials with original advanced commercialization and functionality.

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ZnO quantum dots decorated 3DOM TiO2 nanocomposites: Symbiose of quantum size effects and photonic structure for highly enhanced photocatalytic degradation of organic pollutants

Cited by 98 publications

References 91 publications

Sandwich-structured TiO₂ inverse opal circulates slow photons for tremendous improvement in solar energy conversion efficiency

Sandwich-structured TiO₂ inverse opal circulates slow photons for tremendous improvement in solar energy conversion efficiency

Facile and Cost‐Efficient Synthesis of Quasi‐0D/2D ZnO/MoS₂ Nanocomposites for Highly Enhanced Visible‐Light‐Driven Photocatalytic Degradation of Organic Pollutants and Antibiotics

Light‐Driven Sustainable Hydrogen Production Utilizing TiO₂ Nanostructures: A Review

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ZnO quantum dots decorated 3DOM TiO2 nanocomposites: Symbiose of quantum size effects and photonic structure for highly enhanced photocatalytic degradation of organic pollutants

Cited by 98 publications

References 91 publications

Sandwich-structured TiO2 inverse opal circulates slow photons for tremendous improvement in solar energy conversion efficiency

Sandwich-structured TiO2 inverse opal circulates slow photons for tremendous improvement in solar energy conversion efficiency

Facile and Cost‐Efficient Synthesis of Quasi‐0D/2D ZnO/MoS2 Nanocomposites for Highly Enhanced Visible‐Light‐Driven Photocatalytic Degradation of Organic Pollutants and Antibiotics

Light‐Driven Sustainable Hydrogen Production Utilizing TiO2 Nanostructures: A Review

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Sandwich-structured TiO₂ inverse opal circulates slow photons for tremendous improvement in solar energy conversion efficiency

Sandwich-structured TiO₂ inverse opal circulates slow photons for tremendous improvement in solar energy conversion efficiency

Facile and Cost‐Efficient Synthesis of Quasi‐0D/2D ZnO/MoS₂ Nanocomposites for Highly Enhanced Visible‐Light‐Driven Photocatalytic Degradation of Organic Pollutants and Antibiotics

Light‐Driven Sustainable Hydrogen Production Utilizing TiO₂ Nanostructures: A Review