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Articles de revues sur le sujet « Nanomaterials - Light Harvesting Systems »

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Auteur : Grafiati
Publié le 7 septembre 2023

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1

Maity, Arunava, Ananta Dey, Monalisa Gangopadhyay et Amitava Das. « Water induced morphological transformation of a poly(aryl ether) dendron amphiphile : helical fibers to nanorods, as light-harvesting antenna systems ». Nanoscale 10, no 3 (2018) : 1464–73. http://dx.doi.org/10.1039/c7nr07663k.

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Ferrando, Giulio, Matteo Gardella, Matteo Barelli, Debasree Chowdhury, Pham Duy Long, Nguyen Si Hieu, Maria Caterina Giordano et Francesco Buatier de Mongeot. « Plasmonic and 2D-TMD nanoarrays for large-scale photon harvesting and enhanced molecular photo-bleaching ». EPJ Web of Conferences 266 (2022) : 09003. http://dx.doi.org/10.1051/epjconf/202226609003.

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The urgent environmental and energy challenges require novel solutions for efficient light harvesting and conversion in new-generation ultra-thin devices. Plasmonic nanoantennas and flat optics nanogratings can promote light matter interaction at the nanoscale being very attractive for ultra-thin photonics and sensing applications. In this work we developed two light trapping solutions based on large-scale nanomaterials. The first system is a large-scale (cm2) plasmonic metasurface based on self-organized gold nanostripes. The second is based on the periodic re-shaping of ultra-thin semiconducting MoS2 layers forming large-area flat-optics nanogratings. Under this condition Rayleigh Anomalies can be resonantly excited thus promoting in-plane light confinement and photon absorption into the few-layers material. To demonstrate the impact of these nanopatterned systems in photon harvesting we probed their efficiency into a prototypal photochemical reaction: the photo-bleaching of Methylene Blue (MB). We demonstrate the resonant enhancement of the photo-bleaching of these polluting dye molecules promoted either by the localized plasmon resonance in Au nanostripes or by the Rayleigh Anomaly in flat-optics MoS2 nanogratings. We investigate this effect through a quantitative analysis of the solution photodissociation induced by a monochromatic light. These results show the strong potential of flat-optics templates for light-harvesting and energy conversion in ultra-thin photonic devices.
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Rozhkova, Elena. « Nano-Bio Assemblies Based on Natural and Artificial Proton Pump for Photocatalytic Hydrogen Production ». ECS Meeting Abstracts MA2018-01, no 31 (13 avril 2018) : 1893. http://dx.doi.org/10.1149/ma2018-01/31/1893.

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Bioinspired photocatalytic transformation of solar energy and water to clean fuels such as hydrogen using semiconductors is among the most promising renewable energy technologies. “Greener” schemes of photocatalytic visible-light hydrogen production along with inorganic material utilize biological structures capable of light-harvesting, water splitting, or proton reduction. We have been developing visible-light-driven nano-bio photocatalysts for hydrogen production based on non-covalent assemblies of the natural and synthetic membrane proton pump and TiO2 semiconductor nanoparticles. A natural membrane complex of retinal-bearing proton pump bacteriorhodopsin (also known as purple membranes, PM) from the extremophile organism Halobacterium salinarum has been attracting an attention of researchers owing to its exceptional robustness, excellent photophysical properties, and structure−functional elegance. We demonstrated applicability of PMs in sunlight transformation systems constructed from TiO2, boosted with introduction of reduced graphene oxide rGO, or more recently, constructed as entirely synthetic PM – semiconductor architecture using cell-free synthetic biology approach. Fusing nanotechnology and synthetic biology approaches allows for systemic manipulation at the nanoparticle−bio interface toward directed evolution of energy nanomaterials and nanosystems. S. Balasubraanian, P. Wang, R. Schaller, T. Rajh, E.A. Rozhkova, NanoLetters 13, 3365−3371 (2013) P. Wang, N.M. Dimitrijevic, A.Y. Chang, R.D. Schaller, Y. Liu, T. Rajh, E.A. Rozhkova, ACS Nano, 8(8), 7995-8002 (2014) P. Wang, A. Y. Chang, V. Novosad, V. V. Chupin, R.D. Schaller, E. A. Rozhkova, ACS Nano, 11 (7), pp 6739–6745 (2017) E.A. Rozhkova, P. Wang. In Nanomaterials for Photocatalytic Chemistry, 12, 195-227 (2016)
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Szabó, Tibor, Róbert Janovics, Marianna Túri, István Futó, István Papp, Mihály Braun, Krisztián Németh et al. « Isotope Analytical Characterization of Carbon-Based Nanocomposites ». Radiocarbon 60, no 4 (août 2018) : 1101–14. http://dx.doi.org/10.1017/rdc.2018.63.

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ABSTRACTCarbon-based nanomaterials of different dimensions (1–3D, tubes, bundles, films, papers and sponges, graphene sheets) have been created and their characteristic properties have been discussed intensively in the literature. Due to their unique advantageous, tunable properties these materials became promising candidates in new generations of applications in many research laboratories and, recently, in industries as well. Protein-based bio-nanocomposites are referred to as materials of the future, which may serve as conceptual revolution in the development of integrated optical devices, e.g. optical switches, microimaging systems, sensors, telecommunication technologies or energy harvesting and biosensor applications. In our experiments, we designed various carbon-based nanomaterials either doped or not doped with nitrogen or sulfur during catalytic chemical vapor deposition synthesis. Radio- and isotope analytical studies have shown that the used starting materials, precursors and carriers have a strong influence on the geometry and physico-/chemical characteristics of the carbon nanotubes produced. After determining the 14C isotope constitution 53 m/m% balance was found in the reaction center protein/carbon nanotubes complex in a sensitive way that was prepared in our laboratory. The result is essential in determining the yield of conversion of light energy to chemical potential in this bio-hybrid system.
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Sun, Ke, Xiaotong Peng, Zengkang Gan, Wei Chen, Xiaolin Li, Tao Gong et Pu Xiao. « 3D Printing/Vat Photopolymerization of Photopolymers Activated by Novel Organic Dyes as Photoinitiators ». Catalysts 12, no 10 (19 octobre 2022) : 1272. http://dx.doi.org/10.3390/catal12101272.

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Even though numerous organic dyes which are used as photoinitiators/photocatalysts during photopolymerization have been systematically investigated and collected in previous reviews, further designs of these chromophores and the developments in high-performance photoinitiating systems have emerged in recent years, which play the crucial role in 3D printing/Vat polymerization. Here, in this mini-review, various families of organic dyes that are used as newly synthesized photoinitiators/photocatalysts which were reported in literature during 2021–2022 are specified by their photoinitiation mechanisms, which dominate their performance during photopolymerization, especially in 3D printing. Markedly, visible light-induced polymerization could be employed in circumstances not only upon the irradiation of artificial light sources, e.g., in LEDs, but also in sunlight irradiation. Furthermore, a short overview of the achievements of newly developed mechanisms, e.g., RAFT, photoinitiator-RAFT, and aqueous RAFT using organic chromophores as light-harvesting compounds to induce photopolymerization upon visible light irradiation are also thoroughly discussed. Finally, the reports on the semiconducting nanomaterials that have been used as photoinitiators/photocatalysts during photopolymerization are also introduced as perspectives that are able to expand the scope of 3D printing and materials science due to their various advantages such as high extinction coefficients, broad absorption spectra, and having multiple molecular binding points.
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Kapoor, Riti Thapar, Mohd Rafatullah, Mohammad Qamar, Mohammad Qutob, Abeer M. Alosaimi, Hajer S. Alorfi et Mahmoud A. Hussein. « Review on Recent Developments in Bioinspired-Materials for Sustainable Energy and Environmental Applications ». Sustainability 14, no 24 (16 décembre 2022) : 16931. http://dx.doi.org/10.3390/su142416931.

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Nature has always inspired innovative minds for development of new designs. Animals and plants provide various structures with lower density, more strength and high energy sorption abilities that can incite the development of new designs with significant properties. By observing the important functions of biological structures found in nature, scientists have fabricated structures by bio-inspiration that have been proved to exhibit a significant improvement over traditional structures for their applications in the environmental and energy sector. Bio-fabricated materials have shown many advantages due to their easy synthesis, flexible nature, high performance and multiple functions as these can be used in light harvesting systems, batteries, biofuels, catalysis, purification of water, air and environmental monitoring. However, there is an urgent need for sensitive fabrication instruments that can synthesize bio-inspired structures and convert laboratory scale synthesis into large scale production. The present review highlights recent advances in synthesis of bio-inspired materials and use of hierarchical nanomaterials generated through biomolecular self-assembly for their use in removal of environmental contaminants and sustainable development.
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Isram, Muhammad, Riccardo Magrin Maffei, Valeria Demontis, Leonardo Martini, Stiven Forti, Camilla Coletti, Vittorio Bellani et al. « Thermoelectric and Structural Properties of Sputtered AZO Thin Films with Varying Al Doping Ratios ». Coatings 13, no 4 (28 mars 2023) : 691. http://dx.doi.org/10.3390/coatings13040691.

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Nanomaterials can be game-changers in the arena of sustainable energy production because they may enable highly efficient thermoelectric energy conversion and harvesting. For this purpose, doped thin film oxides have been proven to be promising systems for achieving high thermoelectric performances. In this work, the design, realization, and experimental investigation of the thermoelectric properties exhibited by a set of five Al:ZnO thin films with thicknesses of 300 nm and Al doping levels ranging from 2 to 8 at.% are described. Using a multi-technique approach, the main structural and morphological features of the grown thin films are addressed, as well as the electrical and thermoelectrical transport properties. The results show that the samples exhibited a Seebeck coefficient absolute value in the range of 22–33 μV/K, assuming their maximum doping level was 8 at.%, while the samples’ resistivity was decreased below 2 × 10−3 Ohm·cm with a doping level of 3 at.%. The findings shine light on the perspectives of the applications of the metal ZnO thin film technology for thermoelectrics.
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Zou, Tongqing, Yu Liu, Xinyue Zhang, Lu Chen, Qinqin Xu, Yancheng Ding, Ping Li, Chen Xie, Chao Yin et Quli Fan. « Oligomerization Strategy of D-A-Type Conjugated Molecules for Improved NIR-II Fluorescence Imaging ». Polymers 15, no 16 (18 août 2023) : 3451. http://dx.doi.org/10.3390/polym15163451.

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Fluorescence imaging (FI) in the second near-infrared (NIR-II) window has emerged as a promising imaging method for cancer diagnosis because of its superior properties such as deep penetration depth and high signal-to-background ratio. Despite the superiorities of organic conjugated nanomaterials for NIR-II FI, the issues of low fluorescence quantum yield, weak metabolic capability, undefined molecular structure for conjugated polymers, weak light-harvesting ability, short emission wavelength, and high synthetic complexity for conjugated small molecules still remain to be concerned. We herein propose an oligomerization strategy by facilely adjusting the oligomerization time to balance the advantages and disadvantages between conjugated polymers and small molecules, obtaining the candidate (CO1, oligomerization time: 1 min) with the optimal NIR-II optical performance. Then the CO1 is further prepared into water-dispersed nanoparticles (CON1) via a nanoprecipitation approach. By virtue of the suitable size, excellent NIR-II optical properties, low toxicity, and strong cell-labeling ability, the CON1 is successfully employed for in vivo NIR-II imaging, permitting the real-time visualization of blood vascular system and tumors with high sensitivity and resolution. This work thus not only provides a personalized organic conjugated nano-agent for NIR-II FI, but also highlights the molecular strategy for the development of organic conjugated systems with optimal performance for bio-imaging.
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Torres, Tomas, Elisa López-Serrano, Marta Gomez-Gomez, Luis M. Mateo, Jorge Labella, Giovanni Bottari et Mine Ince. « (Invited) Porphyrinoid-Carbon Nanostructure Ensembles and Fused Porphyrin-Graphene Nanoribbons ». ECS Meeting Abstracts MA2022-01, no 11 (7 juillet 2022) : 828. http://dx.doi.org/10.1149/ma2022-0111828mtgabs.

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Phthalocyanines (Pcs) have emerged as excellent light harvesting antennas for incorporation into D-A systems, mainly in connection with carbon nanostructures, like endohedral metallofullerenes, SWCNT and graphene, as acceptor or donor moieties, in which the Pc has been attached, covalently or through supramolecular interactions. They are among the few molecules that reveal an intense red and NIR absorption and therefore, constitute also promising dyes in molecular photovoltaics. Pcs have a great chemical versatility, which allows to modify their electronic character and their physicochemical properties by organic synthesis, by introducing substituents in the periphery or modifying the structure of the macrocycle. Most recently they have reached good efficiency values participating as hole transporting materials in Carbon-based Perovskite sensitized solar cells (PSSCs). Pcs are be appropriately designed to adapt well to the electronic levels of the different types of perovskites. Through a rational design, structure-property relationships will be established that will gradually improve the performance of the devices. On the other hand, on-surface synthesis offers a versatile approach to fabricate novel carbon-based nanostructures that cannot be obtained via conventional solution chemistry. Within the family of such nanomaterials, graphene nanoribbons (GNRs) hold a privileged position due to their high potential for different applications. One of the key issues for their application in molecular electronics lies in the fine-tuning of their electronic properties through structural modifications, such as heteroatom doping or the incorporation of non-benzenoid rings. In this context, the covalent fusion of GNRs and porphyrins (Pors) represents a highly appealing strategy.
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10

FOX, MARYE ANNE, WAYNE E. JONES et DIANA M. WATKINS. « Light-Harvesting Polymer Systems ». Chemical & ; Engineering News 71, no 11 (15 mars 1993) : 38–48. http://dx.doi.org/10.1021/cen-v071n011.p038.

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Sonika, Sushil Kumar Verma, Siddhartha Samanta, Ankit Kumar Srivastava, Sonali Biswas, Rim M. Alsharabi et Shailendra Rajput. « Conducting Polymer Nanocomposite for Energy Storage and Energy Harvesting Systems ». Advances in Materials Science and Engineering 2022 (24 août 2022) : 1–23. http://dx.doi.org/10.1155/2022/2266899.

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Conducting polymers (CPs) have received a lot of attention because of their unique advantages over popular materials, such as universal and tunable electrical conductivity, simple invention approach, high mechanical strength, low weight, low price, and ease of processing. Polymer nanocomposites have been enthusiastically explored as superlative energy generators for low-power-consuming electronic strategies and confirmed progressive surface area, electronic conductivity, and amazing electrochemical behaviour through expanding the opportunity of utilization. The hybridization of conducting polymer with inorganic hybrid and organic nanomaterials also resulted in multifunctional hybrid nanocomposites with better capabilities in a variety of devices, including sensors, energy storage, energy harvesting, and defensive devices. The capability and assistance of modern advancements for the development of multifunctional nanomaterials/nanocomposites have been presented, as well as the approaches for producing nanostructured CPs. The mechanisms underlying their electrical conductivity, and ways for modifying their properties, are investigated. The ongoing research towards generating superior CP-based nanomaterials is also discussed. This assessment focuses on the important schemes involved in the scientific and industrial use of polymeric materials and nanocomposites intended for the scheme and manufacture of energy strategies such as solar cells, rechargeable batteries, supercapacitors, and energy cells, as well as the waiting problems and their prospects.
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Reineker, P., Ch Warns, Ch Supritz et I. Barvík. « Exciton dynamics in light harvesting systems ». Journal of Luminescence 102-103 (mai 2003) : 802–6. http://dx.doi.org/10.1016/s0022-2313(02)00645-2.

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Semchuk, O. Yu, T. Gatti et S. Osella. « Carbon based hybrid nanomaterials : overview and challenges ahead ». SURFACE 14(29) (30 décembre 2022) : 78–94. http://dx.doi.org/10.15407/surface.2022.14.078.

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In recent years, many new materials have been developed and prepared to improve the performance of light-harvesting technologies and to develop new and attractive applications. The problem of stability of long-term operation of various optoelectronic devices based on organic materials, both conjugated polymers and small molecules of organic semiconductors (SMOSs), is becoming relevant now. One way to solve this problem is to use carbon nanostructures, such as carbon nanotubes and a large family of graphene-based materials, which have enhanced stability, in carefully designed nanohybrid or nanocomposite architectures that can be integrated into photosensitive layers and where their potential is not yet know fully disclosed. Recently, a new trend has been seen in this direction - the use of nanoscale materials for, first of all, the conversion of light into electricity. The main goal of this approach is to rationally design stable and highly efficient carbon-based hybrid nanomaterials for optoelectrical applications, namely light harvesting/electricity conversion, which can be implemented in real optoelectrical devices. In this review, we will discuss the theoretical and experimental foundations of the hybridization of carbon nanostructures (CNSs) with other materials to reveal new optoelectronic properties and provide an overview of existing examples in the literature that will predict interesting future perspectives for use in future devices.
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Chen, Lipeng, Prathamesh Shenai, Fulu Zheng, Alejandro Somoza et Yang Zhao. « Optimal Energy Transfer in Light-Harvesting Systems ». Molecules 20, no 8 (20 août 2015) : 15224–72. http://dx.doi.org/10.3390/molecules200815224.

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Fleming, Graham R., et Rienk van Grondelle. « Femtosecond spectroscopy of photosynthetic light-harvesting systems ». Current Opinion in Structural Biology 7, no 5 (octobre 1997) : 738–48. http://dx.doi.org/10.1016/s0959-440x(97)80086-3.

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Vollmer, Martin S., Frank Würthner, Franz Effenberger, Peter Emele, Dirk U. Meyer, Thomas Stümpfig, Helmut Port et Hans C. Wolf. « Anthryloligothienylporphyrins : Energy Transfer and Light-Harvesting Systems ». Chemistry - A European Journal 4, no 2 (10 février 1998) : 260–69. http://dx.doi.org/10.1002/(sici)1521-3765(19980210)4:2<260 ::aid-chem260>3.0.co;2-9.

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Ensslen, Philipp, Fabian Brandl, Sabrina Sezi, Reji Varghese, Roger-Jan Kutta, Bernhard Dick et Hans-Achim Wagenknecht. « DNA-Based Oligochromophores as Light-Harvesting Systems ». Chemistry - A European Journal 21, no 26 (9 juin 2015) : 9349–54. http://dx.doi.org/10.1002/chem.201501213.

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Lee, Seok Woo. « Editorial for Special Issue : Highly Efficient Energy Harvesting Based on Nanomaterials ». Nanomaterials 12, no 9 (6 mai 2022) : 1572. http://dx.doi.org/10.3390/nano12091572.

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Thilagam, A. « Natural light harvesting systems : unraveling the quantum puzzles ». Journal of Mathematical Chemistry 53, no 2 (22 novembre 2014) : 466–94. http://dx.doi.org/10.1007/s10910-014-0442-x.

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Chmeliov, Jevgenij, Gediminas Trinkunas, Herbert van Amerongen et Leonas Valkunas. « Excitation migration in fluctuating light-harvesting antenna systems ». Photosynthesis Research 127, no 1 (22 janvier 2015) : 49–60. http://dx.doi.org/10.1007/s11120-015-0083-3.

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Ma, Xinyu, Sebastian Bader et Bengt Oelmann. « Power Estimation for Indoor Light Energy Harvesting Systems ». IEEE Transactions on Instrumentation and Measurement 69, no 10 (octobre 2020) : 7513–21. http://dx.doi.org/10.1109/tim.2020.2984145.

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Knoester, Jasper, et Siegfried Daehne. « Prospects of Artificial Light Harvesting Systems : An Introduction ». International Journal of Photoenergy 2006 (2006) : 1–3. http://dx.doi.org/10.1155/ijp/2006/54638.

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Guo, Ziyi, Joseph J. Richardson, Biao Kong et Kang Liang. « Nanobiohybrids : Materials approaches for bioaugmentation ». Science Advances 6, no 12 (mars 2020) : eaaz0330. http://dx.doi.org/10.1126/sciadv.aaz0330.

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Nanobiohybrids, synthesized by integrating functional nanomaterials with living systems, have emerged as an exciting branch of research at the interface of materials engineering and biological science. Nanobiohybrids use synthetic nanomaterials to impart organisms with emergent properties outside their scope of evolution. Consequently, they endow new or augmented properties that are either innate or exogenous, such as enhanced tolerance against stress, programmed metabolism and proliferation, artificial photosynthesis, or conductivity. Advances in new materials design and processing technologies made it possible to tailor the physicochemical properties of the nanomaterials coupled with the biological systems. To date, many different types of nanomaterials have been integrated with various biological systems from simple biomolecules to complex multicellular organisms. Here, we provide a critical overview of recent developments of nanobiohybrids that enable new or augmented biological functions that show promise in high-tech applications across many disciplines, including energy harvesting, biocatalysis, biosensing, medicine, and robotics.
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Liao, Lijun, Mingtao Wang, Zhenzi Li, Xuepeng Wang et Wei Zhou. « Recent Advances in Black TiO2 Nanomaterials for Solar Energy Conversion ». Nanomaterials 13, no 3 (24 janvier 2023) : 468. http://dx.doi.org/10.3390/nano13030468.

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Titanium dioxide (TiO2) nanomaterials have been widely used in photocatalytic energy conversion and environmental remediation due to their advantages of low cost, chemical stability, and relatively high photo-activity. However, applications of TiO2 have been restricted in the ultraviolet range because of the wide band gap. Broadening the light absorption of TiO2 nanomaterials is an efficient way to improve the photocatalytic activity. Thus, black TiO2 with extended light response range in the visible light and even near infrared light has been extensively exploited as efficient photocatalysts in the last decade. This review represents an attempt to conclude the recent developments in black TiO2 nanomaterials synthesized by modified treatment, which presented different structure, morphological features, reduced band gap, and enhanced solar energy harvesting efficiency. Special emphasis has been given to the newly developed synthetic methods, porous black TiO2, and the approaches for further improving the photocatalytic activity of black TiO2. Various black TiO2, doped black TiO2, metal-loaded black TiO2 and black TiO2 heterojunction photocatalysts, and their photocatalytic applications and mechanisms in the field of energy and environment are summarized in this review, to provide useful insights and new ideas in the related field.
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Channon, Kevin J., Glyn L. Devlin et Cait E. MacPhee. « Efficient Energy Transfer within Self-Assembling Peptide Fibers : A Route to Light-Harvesting Nanomaterials ». Journal of the American Chemical Society 131, no 35 (9 septembre 2009) : 12520–21. http://dx.doi.org/10.1021/ja902825j.

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Calderón, Leonardo F., et Leonardo A. Pachón. « Nonadiabatic sunlight harvesting ». Physical Chemistry Chemical Physics 22, no 22 (2020) : 12678–87. http://dx.doi.org/10.1039/d0cp01672a.

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Hancock, Ashley M., Sophie A. Meredith, Simon D. Connell, Lars J. C. Jeuken et Peter G. Adams. « Proteoliposomes as energy transferring nanomaterials : enhancing the spectral range of light-harvesting proteins using lipid-linked chromophores ». Nanoscale 11, no 35 (2019) : 16284–92. http://dx.doi.org/10.1039/c9nr04653d.

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Self-assembled proteoliposomes allow highly efficient energy transfer from the spectrally-complementary chromophore Texas Red to the plant light-harvesting protein LHCII, increasing the effective absorption range of this bio-hybrid system.
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Shahbazian-Yassar, R., H. Ghassemi, A. Asthana, M. Au et Y. Yap. « Real Time Observation of Nanomaterials in Energy Harvesting and Li-ion Battery Systems ». Microscopy and Microanalysis 17, S2 (juillet 2011) : 1570–71. http://dx.doi.org/10.1017/s1431927611008725.

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Wang, Zhao, Xumin Pan, Yahua He, Yongming Hu, Haoshuang Gu et Yu Wang. « Piezoelectric Nanowires in Energy Harvesting Applications ». Advances in Materials Science and Engineering 2015 (2015) : 1–21. http://dx.doi.org/10.1155/2015/165631.

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Recently, the nanogenerators which can convert the mechanical energy into electricity by using piezoelectric one-dimensional nanomaterials have exhibited great potential in microscale power supply and sensor systems. In this paper, we provided a comprehensive review of the research progress in the last eight years concerning the piezoelectric nanogenerators with different structures. The fundamental piezoelectric theory and typical piezoelectric materials are firstly reviewed. After that, the working mechanism, modeling, and structure design of piezoelectric nanogenerators were discussed. Then the recent progress of nanogenerators was reviewed in the structure point of views. Finally, we also discussed the potential application and future development of the piezoelectric nanogenerators.
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Badu, Shyam, Roderick Melnik et Sundeep Singh. « Analysis of Photosynthetic Systems and Their Applications with Mathematical and Computational Models ». Applied Sciences 10, no 19 (29 septembre 2020) : 6821. http://dx.doi.org/10.3390/app10196821.

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In biological and life science applications, photosynthesis is an important process that involves the absorption and transformation of sunlight into chemical energy. During the photosynthesis process, the light photons are captured by the green chlorophyll pigments in their photosynthetic antennae and further funneled to the reaction center. One of the most important light harvesting complexes that are highly important in the study of photosynthesis is the membrane-attached Fenna–Matthews–Olson (FMO) complex found in the green sulfur bacteria. In this review, we discuss the mathematical formulations and computational modeling of some of the light harvesting complexes including FMO. The most recent research developments in the photosynthetic light harvesting complexes are thoroughly discussed. The theoretical background related to the spectral density, quantum coherence and density functional theory has been elaborated. Furthermore, details about the transfer and excitation of energy in different sites of the FMO complex along with other vital photosynthetic light harvesting complexes have also been provided. Finally, we conclude this review by providing the current and potential applications in environmental science, energy, health and medicine, where such mathematical and computational studies of the photosynthesis and the light harvesting complexes can be readily integrated.
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Querebillo, Christine Joy. « A Review on Nano Ti-Based Oxides for Dark and Photocatalysis : From Photoinduced Processes to Bioimplant Applications ». Nanomaterials 13, no 6 (8 mars 2023) : 982. http://dx.doi.org/10.3390/nano13060982.

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Catalysis on TiO2 nanomaterials in the presence of H2O and oxygen plays a crucial role in the advancement of many different fields, such as clean energy technologies, catalysis, disinfection, and bioimplants. Photocatalysis on TiO2 nanomaterials is well-established and has advanced in the last decades in terms of the understanding of its underlying principles and improvement of its efficiency. Meanwhile, the increasing complexity of modern scientific challenges in disinfection and bioimplants requires a profound mechanistic understanding of both residual and dark catalysis. Here, an overview of the progress made in TiO2 catalysis is given both in the presence and absence of light. It begins with the mechanisms involving reactive oxygen species (ROS) in TiO2 photocatalysis. This is followed by improvements in their photocatalytic efficiency due to their nanomorphology and states by enhancing charge separation and increasing light harvesting. A subsection on black TiO2 nanomaterials and their interesting properties and physics is also included. Progress in residual catalysis and dark catalysis on TiO2 are then presented. Safety, microbicidal effect, and studies on Ti-oxides for bioimplants are also presented. Finally, conclusions and future perspectives in light of disinfection and bioimplant application are given.
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Bentz, Jonathan L., Fatemeh Niroomand Hosseini et John J. Kozak. « Influence of geometry on light harvesting in dendrimeric systems ». Chemical Physics Letters 370, no 3-4 (mars 2003) : 319–26. http://dx.doi.org/10.1016/s0009-2614(03)00108-8.

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Heřman, Pavel, Ulrich Kleinekathöfer, Ivan Barvı́k et Michael Schreiber. « Exciton scattering in light-harvesting systems of purple bacteria ». Journal of Luminescence 94-95 (décembre 2001) : 447–50. http://dx.doi.org/10.1016/s0022-2313(01)00334-9.

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Li, Wei-Jian, Xu-Qing Wang, Wei Wang, Zhubin Hu, Yubin Ke, Hanqiu Jiang, Chunyong He et al. « Dynamic artificial light-harvesting systems based on rotaxane dendrimers ». Giant 2 (juin 2020) : 100020. http://dx.doi.org/10.1016/j.giant.2020.100020.

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Somsen, Oscar J. G., Vladimir Chernyak, Raoul N. Frese, Rienk van Grondelle et Shaul Mukamel. « Excitonic Interactions and Stark Spectroscopy of Light Harvesting Systems ». Journal of Physical Chemistry B 102, no 44 (octobre 1998) : 8893–908. http://dx.doi.org/10.1021/jp981114o.

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Saga, Yoshitaka, et Hitoshi Tamiaki. « Fluorescence Spectroscopy of Single Photosynthetic Light-Harvesting Supramolecular Systems ». Cell Biochemistry and Biophysics 40, no 2 (2004) : 149–65. http://dx.doi.org/10.1385/cbb:40:2:149.

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Hu, Yi‐Xiong, Wei‐Jian Li, Pei‐Pei Jia, Xu‐Qing Wang, Lin Xu et Hai‐Bo Yang. « Supramolecular Artificial Light‐Harvesting Systems with Aggregation‐Induced Emission ». Advanced Optical Materials 8, no 14 (5 juin 2020) : 2000265. http://dx.doi.org/10.1002/adom.202000265.

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Kobuke, Yoshiaki. « Artificial Light-Harvesting Systems by Use of Metal Coordination ». European Journal of Inorganic Chemistry 2006, no 12 (juin 2006) : 2333–51. http://dx.doi.org/10.1002/ejic.200600161.

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Olejko, L., et I. Bald. « FRET efficiency and antenna effect in multi-color DNA origami-based light harvesting systems ». RSC Advances 7, no 39 (2017) : 23924–34. http://dx.doi.org/10.1039/c7ra02114c.

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Artificial light harvesting complexes find applications in photosynthesis, photovoltaics and chemical sensors. Here, we present the characterization and optimization of a multi-color artificial light harvesting system on DNA origami structures.
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Kartini, Indriana. « Progress on Nanomaterials for Photoelectrochemical Solar Cells : from Titania to Perovskites ». E3S Web of Conferences 125 (2019) : 14015. http://dx.doi.org/10.1051/e3sconf/201912514015.

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Solar cells have been the queen of alternative renewable energy for the earth. From silicon-based solar cells to the new generation of perovskite-based solar cells, the choice and performance of the materials of the corresponding cells are still the focus of research interest. Amongst, photoelectrochemical (PEC) solar cells trigger the use and exploration of nanomaterials to boost their cell’s performance. This short review focus on the development of nanomaterials used for PEC, from nanoparticles to the one-dimensional titanium dioxide (titania) such as nanofibers and nanotubes, as well as the hybrid system with the perovskite halide. The search for light-harvesting materials is also included especially natural dyes. The review ends with a strategy to marry the natural dyes' potential with the sophisticated structure of nanomaterials to result in an efficient natural dyes PEC solar cells.
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Rethi, Lekshmi, Chinmaya Mutalik, Dito Anurogo, Long-Sheng Lu, Hsiu-Yi Chu, Sibidou Yougbaré, Tsung-Rong Kuo, Tsai-Mu Cheng et Fu-Lun Chen. « Lipid-Based Nanomaterials for Drug Delivery Systems in Breast Cancer Therapy ». Nanomaterials 12, no 17 (26 août 2022) : 2948. http://dx.doi.org/10.3390/nano12172948.

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Globally, breast cancer is one of the most prevalent diseases, inducing critical intimidation to human health. Lipid-based nanomaterials have been successfully demonstrated as drug carriers for breast cancer treatment. To date, the development of a better drug delivery system based on lipid nanomaterials is still urgent to make the treatment and diagnosis easily accessible to breast cancer patients. In a drug delivery system, lipid nanomaterials have revealed distinctive features, including high biocompatibility and efficient drug delivery. Specifically, a targeted drug delivery system based on lipid nanomaterials has inherited the advantage of optimum dosage and low side effects. In this review, insights on currently used potential lipid-based nanomaterials are collected and introduced. The review sheds light on conjugation, targeting, diagnosis, treatment, and clinical significance of lipid-based nanomaterials to treat breast cancer. Furthermore, a brighter side of lipid-based nanomaterials as future potential drug delivery systems for breast cancer therapy is discussed.
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Lee, Sher Ling, et Chi-Jung Chang. « Recent Progress on Metal Sulfide Composite Nanomaterials for Photocatalytic Hydrogen Production ». Catalysts 9, no 5 (17 mai 2019) : 457. http://dx.doi.org/10.3390/catal9050457.

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Metal sulfide-based photocatalysts have gained much attention due to their outstanding photocatalytic properties. This review paper discusses recent developments on metal sulfide-based nanomaterials for H2 production, acting as either photocatalysts or cocatalysts, especially in the last decade. Recent progress on key experimental parameters, in-situ characterization methods, and the performance of the metal sulfide photocatalysts are systematically discussed, including the forms of heterogeneous composite photocatalysts, immobilized photocatalysts, and magnetically separable photocatalysts. Some methods have been studied to solve the problem of rapid recombination of photoinduced carriers. The electronic density of photocatalysts can be investigated by in-situ C K-edge near edge X-ray absorption fine structure (NEXAFS) spectra to study the mechanism of the photocatalytic process. The effects of crystal properties, nanostructure, cocatalyst, sacrificial agent, electrically conductive materials, doping, calcination, crystal size, and pH on the performance of composite photocatalysts are presented. Moreover, the facet effect and light trapping (or light harvesting) effect, which can improve the photocatalytic activity, are also discussed.
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Rauwel, Protima, Martin Salumaa, Andres Aasna, Augustinas Galeckas et Erwan Rauwel. « A Review of the Synthesis and Photoluminescence Properties of Hybrid ZnO and Carbon Nanomaterials ». Journal of Nanomaterials 2016 (2016) : 1–12. http://dx.doi.org/10.1155/2016/5320625.

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Photoluminescent ZnO carbon nanomaterials are an emerging class of nanomaterials with unique optical properties. They each, ZnO and carbon nanomaterials, have an advantage of being nontoxic and environmentally friendly. Their cost-effective production methods along with simple synthesis routes are also of interest. Moreover, ZnO presents photoluminescence emission in the UV and visible region depending on the synthesis routes, shape, size, deep level, and surface defects. When combined with carbon nanomaterials, modification of surface defects in ZnO allows tuning of these photoluminescence properties to produce, for example, white light. Moreover, efficient energy transfer from the ZnO to carbon nanostructures makes them suitable candidates not only in energy harvesting applications but also in biosensors, photodetectors, and low temperature thermal imaging. This work reviews the synthesis and photoluminescence properties of 3 carbon allotropes: carbon quantum or nanodots, graphene, and carbon nanotubes when hybridized with ZnO nanostructures. Various synthesis routes for the hybrid materials with different morphologies of ZnO are presented. Moreover, differences in photoluminescence emission when combining ZnO with each of the three different allotropes are analysed.
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Schlau-Cohen, G. S. « Principles of light harvesting from single photosynthetic complexes ». Interface Focus 5, no 3 (6 juin 2015) : 20140088. http://dx.doi.org/10.1098/rsfs.2014.0088.

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Photosynthetic systems harness sunlight to power most life on Earth. In the initial steps of photosynthetic light harvesting, absorbed energy is converted to chemical energy with near-unity quantum efficiency. This is achieved by an efficient, directional and regulated flow of energy through a network of proteins. Here, we discuss the following three key principles of this flow and of photosynthetic light harvesting: thermal fluctuations of the protein structure; intrinsic conformational switches with defined functional consequences; and environmentally triggered conformational switches. Through these principles, photosynthetic systems balance two types of operational costs: metabolic costs, or the cost of maintaining and running the molecular machinery, and opportunity costs, or the cost of losing any operational time. Understanding how the molecular machinery and dynamics are designed to balance these costs may provide a blueprint for improved artificial light-harvesting devices. With a multi-disciplinary approach combining knowledge of biology, this blueprint could lead to low-cost and more effective solar energy conversion. Photosynthetic systems achieve widespread light harvesting across the Earth's surface; in the face of our growing energy needs, this is functionality we need to replicate, and perhaps emulate.
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Ishida, Yohei. « Manipulation of supramolecular 2D assembly of functional dyes toward artificial light-harvesting systems ». Pure and Applied Chemistry 87, no 1 (1 janvier 2015) : 3–14. http://dx.doi.org/10.1515/pac-2014-0906.

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AbstractIn recent years, excellent research has revealed that light-harvesting systems (LHSs) are composed of beautifully aligned chlorophyll molecules; the regulated alignment of chlorophylls is responsible for the efficient and selective light-harvesting energy transfer processes in purple bacteria. This finding led to the construction of a regularly arranged assembly of functional dyes as a step toward fabricating artificial LHSs. While most approaches toward the construction of dye assemblies have depended on molecular interactions such as covalent, coordination, and hydrogen bonds, my approach involves guest–host interactions using an inorganic nanosheet as the host material. This short review presents the construction of a 2D dye assembly and its effective utilization in artificial light-harvesting applications. Owing to the highly stable and uniform 2D alignment of functional dyes on inorganic nanosheets, nearly 100 % singlet–singlet energy transfer and efficient light-harvesting were achieved. I believe that the results presented herein will contribute to the construction of efficient photochemical reaction systems in supramolecular host–guest assemblies, which may facilitate the realization of artificial photosynthesis.
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Schlau-Cohen, Gabriela S., et Graham R. Fleming. « Structure, Dynamics, and Function in the Major Light-Harvesting Complex of Photosystem II ». Australian Journal of Chemistry 65, no 6 (2012) : 583. http://dx.doi.org/10.1071/ch12022.

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In natural light-harvesting systems, pigment-protein complexes (PPC) convert sunlight to chemical energy with near unity quantum efficiency. PPCs exhibit emergent properties that cannot be simply extrapolated from knowledge of their component parts. In this Perspective, we examine the design principles of PPCs, focussing on the major light-harvesting complex of Photosystem II (LHCII), the most abundant PPC in green plants. Studies using two-dimensional electronic spectroscopy (2DES) provide an incisive tool to probe the electronic, energetic, and spatial landscapes that enable the efficiency observed in photosynthetic light-harvesting. Using the information about energy transfer pathways, quantum effects, and excited state geometry contained within 2D spectra, the excited state properties can be linked back to the molecular structure. This understanding of the structure-function relationships of natural systems constitutes a step towards a blueprint for the construction of artificial light-harvesting devices that can reproduce the efficacy of natural systems.
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Solladié, Nathalie, Régis Rein et Mathieu Walther. « Light harvesting porphyrin-crown ether conjugates : toward artificial photosynthetic systems ». Journal of Porphyrins and Phthalocyanines 11, no 05 (mai 2007) : 375–82. http://dx.doi.org/10.1142/s1088424607000424.

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In this paper we report on our ongoing progress in the preparation of artificial photosynthetic systems through the preparation of light harvesting multi-porphyrins. The synthesis of these antennae is described herein and the energy transfer capabilities of these devices demonstrated. A terminal porphyrin/crown ether conjugate has been maintained in each case to ensure a coordination site for the complexation of an ammonium/ C 60 derivative, which could be chosen as the electron acceptor partner for the preparation of artificial photosynthetic systems.
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Kunugi, Motoshi, Soichirou Satoh, Kunio Ihara, Kensuke Shibata, Yukimasa Yamagishi, Kazuhiro Kogame, Junichi Obokata, Atsushi Takabayashi et Ayumi Tanaka. « Evolution of Green Plants Accompanied Changes in Light-Harvesting Systems ». Plant and Cell Physiology 57, no 6 (6 avril 2016) : 1231–43. http://dx.doi.org/10.1093/pcp/pcw071.

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Monshouwer, René, Malin Abrahamsson, Frank van Mourik et Rienk van Grondelle. « Superradiance and Exciton Delocalization in Bacterial Photosynthetic Light-Harvesting Systems ». Journal of Physical Chemistry B 101, no 37 (septembre 1997) : 7241–48. http://dx.doi.org/10.1021/jp963377t.

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Bonaccorsi, Paola, Maria Chiara Aversa, Anna Barattucci, Teresa Papalia, Fausto Puntoriero et Sebastiano Campagna. « Artificial light-harvesting antenna systems grafted on a carbohydrate platform ». Chemical Communications 48, no 85 (2012) : 10550. http://dx.doi.org/10.1039/c2cc35555h.

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