Готові списки джерел за темами / Quantum Dot Photocatalysis

Добірка наукової літератури з теми "Quantum Dot Photocatalysis"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Quantum Dot Photocatalysis"

Chu, Kuan-Wu, Sher Lee, Chi-Jung Chang, and Lingyun Liu. "Recent Progress of Carbon Dot Precursors and Photocatalysis Applications." Polymers 11, no. 4 (April 16, 2019): 689. http://dx.doi.org/10.3390/polym11040689.

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Carbon dots (CDs), a class of carbon-based sub-ten-nanometer nanoparticles, have attracted great attention since their discovery fifteen years ago. Because of the outstanding photoluminescence properties, photostability, low toxicity, and low cost, CDs have potential to replace traditional semiconductor quantum dots which have serious drawbacks of toxicity and high cost. This review covers the common top-down and bottom-up methods for the synthesis of CDs, different categories of CD precursors (small molecules, natural polymers, and synthetic polymers), one-pot and multi-step methods to produce CDs/photocatalyst composites, and recent advances of CDs on photocatalysis applications mostly in pollutant degradation and energy areas. A broad range of precursors forming fluorescent CDs are discussed, including small molecule sole or dual precursors, natural polymers such as pure polysaccharides and proteins and crude bio-resources from plants or animals, and various synthetic polymer precursors with positive, negative, neutral and hydrophilic, hydrophobic, or zwitterionic feature. Because of the wide light absorbance, excellent photoluminescence properties and electron transfer ability, CDs have emerged as a new type of photocatalyst. Recent work of CDs as sole photocatalyst or in combination with other materials (e.g., metal, metal sulfide, metal oxide, bismuth-based semiconductor, or other traditional photocatalysts) to form composite catalyst for various photocatalytic applications are reviewed. Possible future directions are proposed at the end of the article on mechanistic studies, production of CDs with better controlled properties, expansion of polymer precursor pool, and systematic studies of CDs for photocatalysis applications.

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Chepape, Kgobudi Frans, Thapelo Prince Mofokeng, Pardon Nyamukamba, Kalenga Pierre Mubiayi, and Makwena Justice Moloto. "Enhancing Photocatalytic Degradation of Methyl Blue Using PVP-Capped and Uncapped CdSe Nanoparticles." Journal of Nanotechnology 2017 (2017): 1–6. http://dx.doi.org/10.1155/2017/5340784.

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Quantum confinement of semiconductor nanoparticles is a potential feature which can be interesting for photocatalysis, and cadmium selenide is one simple type of quantum dot to use in the following photocatalytic degradation of organic dyes. CdSe nanoparticles capped with polyvinylpyrrolidone (PVP) in various concentration ratios were synthesized by the chemical reduction method and characterized. The transmission electron microscopy (TEM) analysis of the samples showed that 50% PVP-capped CdSe nanoparticles were uniformly distributed in size with an average of 2.7 nm and shape which was spherical-like. The photocatalytic degradation of methyl blue (MB) in water showed efficiencies of 31% and 48% when using uncapped and 50% PVP-capped CdSe nanoparticles as photocatalysts, respectively. The efficiency of PVP-capped CdSe nanoparticles indicated that a complete green process can be utilized for photocatalytic treatment of water and waste water.

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Wang, Ruili, Yuequn Shang, Pongsakorn Kanjanaboos, Wenjia Zhou, Zhijun Ning, and Edward H. Sargent. "Colloidal quantum dot ligand engineering for high performance solar cells." Energy & Environmental Science 9, no. 4 (2016): 1130–43. http://dx.doi.org/10.1039/c5ee03887a.

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Colloidal quantum dots (CQDs) are fast-improving materials for next-generation solution-processed optoelectronic devices such as solar cells, photocatalysis, light emitting diodes, and photodetectors.

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Kande, Bhupendra, and Prachi Parmar. "Carbon Quantum Dot and Application: A Review." Spectrum of Emerging Sciences 2, no. 1 (April 22, 2022): 11–24. http://dx.doi.org/10.55878/ses2022-2-1-3.

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Non-toxic, fluorescent carbon nanoparticles or carbon quantum dots or carbon dots, a brand new category of carbon material, had high interest due to its optical and fluorescence properties with advantages of eco-friendly, low coast and simple way of synthesis. Their physical – chemical properties also depend to on functionalization and surface passivation. From the discovery of non – toxic caron nano materials, CQDs had numerous applications in different areas like sensing, biological sensing, vivo and vitro imaging, nano drug, drug carrier, drug delivery, energy, food industry, agriculture, photocatalysis and electrocatalysis etc. Here, we described here, the methods of synthesis and functionalization of carbon quantum dots, properties and applications with future prospects.

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Qi, Houjuan, Cai Shi, Xiaona Jiang, Min Teng, Zhe Sun, Zhanhua Huang, Duo Pan, Shouxin Liu, and Zhanhu Guo. "Constructing CeO2/nitrogen-doped carbon quantum dot/g-C3N4 heterojunction photocatalysts for highly efficient visible light photocatalysis." Nanoscale 12, no. 37 (2020): 19112–20. http://dx.doi.org/10.1039/d0nr02965c.

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Ternary CeO₂/nitrogen-doped carbon quantum dot (NCQD)/graphitic carbon nitride (g-C₃N₄) heterojunction nanocomposites were prepared and tested for degrading tetracycline (TC) and generating H₂.

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Li, Lingwei, Hange Feng, Xiaofan Wei, Kun Jiang, Shaolin Xue, and Paul K. Chu. "Ag as Cocatalyst and Electron-Hole Medium in CeO2 QDs/Ag/Ag2Se Z-scheme Heterojunction Enhanced the Photo-Electrocatalytic Properties of the Photoelectrode." Nanomaterials 10, no. 2 (January 31, 2020): 253. http://dx.doi.org/10.3390/nano10020253.

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A recyclable photoelectrode with high degradation capability for organic pollutants is crucial for environmental protection and, in this work, a novel CeO2 quantum dot (QDs)/Ag2Se Z-scheme photoelectrode boasting increased visible light absorption and fast separation and transfer of photo-induced carriers is prepared and demonstrated. A higher voltage increases the photocurrent and 95.8% of tetracycline (TC) is degraded by 10% CeO2 QDs/Ag2Se in 75 minutes. The degradation rate is superior to that achieved by photocatalysis (92.3% of TC in 90 min) or electrocatalysis (27.7% of TC in 90 min). Oxygen vacancies on the CeO2 QDs advance the separation and transfer of photogenerated carriers at the interfacial region. Free radical capture tests demonstrate that •O2−, •OH, and h+ are the principal active substances and, by also considering the bandgaps of CeO2 QDs and Ag2Se, the photocatalytic mechanism of CeO2 QDs/Ag2Se abides by the Z-scheme rather than the traditional heterojunction scheme. A small amount of metallic Ag formed in the photocatalysis process can form a high-speed charge transfer nano channel, which can greatly inhibit the photogenerated carrier recombination, improve the photocatalytic performance, and help form a steady Z-scheme photocatalysis system. This study would lay a foundation for the design of a Z-scheme solar photocatalytic system.

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Liu, Yunxin, Jianxin Shi, Qing Peng, and Yadong Li. "CuO Quantum-Dot-Sensitized Mesoporous ZnO for Visible-Light Photocatalysis." Chemistry - A European Journal 19, no. 13 (February 27, 2013): 4319–26. http://dx.doi.org/10.1002/chem.201203316.

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Homer, Micaela Kalmek, Ding-Yuan Kuo, Florence Y. Dou, and Brandi Michelle Cossairt. "(Keynote) Photoinduced Charge Transfer from Quantum Dots Measured By Cyclic Voltammetry." ECS Meeting Abstracts MA2022-02, no. 20 (October 9, 2022): 916. http://dx.doi.org/10.1149/ma2022-0220916mtgabs.

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Measuring and modulating charge transfer processes at quantum dot interfaces are crucial steps in the development of quantum dot photocatalysis. In this work, cyclic voltammetry under illumination is demonstrated to measure the rate of photoinduced charge transfer from CdS quantum dots by directly probing the changing oxidation states of a library of model charge acceptors. The voltammetry data demonstrates the presence of long-lived electron donor states generated by native photodoping of the QDs as well as the relationship between driving force and rate of charge transfer. Changes to the voltammograms under illumination follow mechanistic predictions from classic zone diagrams and electrochemical modeling allows for measurement of the rate of productive electron transfer, giving rate constants (104 M-1s-1) that are distinct from the ps dynamics measured by conventional optical spectroscopy methods and that are more closely connected to the quantum yield of photoinduced chemical transformations.

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Li, Boyuan, Zhenhua Cao, Shixuan Wang, Qiang Wei, and Zhurui Shen. "BiVO4 quantum dot-decorated BiPO4 nanorods 0D/1D heterojunction for enhanced visible-light-driven photocatalysis." Dalton Transactions 47, no. 30 (2018): 10288–98. http://dx.doi.org/10.1039/c8dt02402b.

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Evangelou, Sofia. "Altering Degenerate Four-Wave Mixing and Third-Harmonic Generation in a Coupled Quantum Dot–Metallic Nanoparticle Structure with the Use of the Purcell Effect." Materials Proceedings 4, no. 1 (November 12, 2020): 39. http://dx.doi.org/10.3390/iocn2020-07875.

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The modification of the optical properties of semiconductor quantum dots near plasmonic nanostructures has attracted significant attention in recent years due to the several potential applications of the coupled nanostructures in optoelectronics, biophotonics and quantum technologies, including sensors, light harvesting, quantum information processing and quantum communication, imaging, photocatalysis, solar cells and others. One of the methods for modifying the nonlinear optical susceptibilities in quantum dots near plasmonic nanostructures uses the change of the spontaneous decay rates of quantum emitters due to the Purcell effect in a tailored nanophotonic environment. In this work, using this idea, we study the modification of the third-order nonlinear optical susceptibilities and specifically the phenomena of degenerate four-wave mixing and third-harmonic generation in a quantum dot that is coupled to a spherical metallic nanoparticle. We find that the strong alteration of the quantum dot’s spontaneous decay rate near the metallic nanoparticle gives strong variation, either enhancement or suppression, of the phenomena of degenerate four-wave mixing and third-harmonic generation for different distances of the quantum dot from the surface of the metallic nanoparticle, depending on the electric dipole direction of the quantum dot. We also show that the degree of enhancement or suppression of the nonlinear optical susceptibilities differs for the studied phenomena and it is stronger for degenerate four-wave mixing than for third-harmonic generation. This work may have important potential applications in the creation of nanoscale photonic devices for various technological applications.

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Більше джерел

Дисертації з теми "Quantum Dot Photocatalysis"

Zhao, Yixin. "Developing Nanomaterials for Energy Conversion." Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1270172686.

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Shallcross, Richard Clayton. "CHARACTERIZATION OF THE SIZE-QUANTIZED ELECTRONIC AND OPTICAL PROPERTIES OF CdSe NANOCRYSTALS FOR APPLICATIONS IN PHOTOCATALYSIS, SOLAR CELLS AND DIFFRACTION GRATINGS." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194710.

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This dissertation presents novel applications of ligand-capped II-VI semiconductor nanocrystals (i.e. CdSe and CdTe).Hybrid polymer-nanocrystal thin films were prepared using a bottom-up electrochemical crosslinking method, where thiophene-functionalized CdSe NCs were wired to electron-rich 3,4-dioxy-substituded thiophene polymers. Both nanocomposite and effective monolayer (EML) films were achieved by controlling monomer feed ratios during the crosslinking steps. These hybrid thin films showed enhanced photoelectrochemical current efficiencies with a variety of solution acceptor molecules compared to polymer control films, which was due to sensitization by the CdSe NCs. The electronic structure of the polymer played a critical role in the potential (doping) dependent hole capture efficiency from photoexcited CdSe NCs. Furthermore, photocurrent efficiencies were correlated with nanocrystal size, which was a direct product of frontier orbital energy shifting due to quantum confinement effects.All-inorganic CdTe-CdSe nanocrystal solar cells were fabricated by a facile layer-by-layer procedure. A low-temperature sintering strategy was utilized to electronically couple the nanocrystal thin films, which maintained the individual electronic properties of the nanocrystals. The electrical characteristics of these solar cells displayed predictable trends in open circuit voltage with varying CdSe NC diameter.Novel CdSe NC diffraction gratings were prepared by a facile microcontact molding procedure. These transmission gratings showed exceptionally high diffraction efficiencies that were dependent on optimum grating morphologies and the refractive index contrast provided by the nanocrystals, which was size-dependent. These films also showed promise as coupling gratings for internal reflection elements.

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Bhattacharyya, Biswajit. "A Study of Photophysics and Photochemistry of I-III-VI2 Nanocrystals." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/4325.

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This thesis, entitled “A Study of Photophysics and Photochemistry of I-III-VI2 Nanocrystals” primarily deals with the properties of I-III-VI2 semiconductor nanocrystals composed of earth abundant, environmentally benign and relatively non-hazardous elements. In initial two chapters, the synthesis and photophysics of CuFeS2 and CuAlS2 QDs have been described. Both materials are potential candidates for various optoelectronic applications, and this makes the study of their physical properties interesting and relevant. Chapter 5 shows the light harvesting potential of I-III-VI2 QDs by using these to perform efficient artificial photosynthesis. Chapter two describes the stable synthesis and interesting optical properties of CuFeS2 and its core shell structures. These materials exhibit a tunable band gap that spans the range of 0.5 – 2 eV (600 nm – 2500 nm). Although the as-prepared material is non-emissive, CuFeS2/CdS core/shell structures are shown to exhibit quantum yields that exceed 80%. Like other members of the I-III-VI2 family QDs, CuFeS2 based nanoparticles exhibit a long- lived emission that is significantly red shifted compared to the band gap. Chapter three shows the various optical properties of CuAlS2 based QDs through calculation and ultrafast studies. CuAlS2/CdS QDs are shown to be associated with cross sections lower than 10-17 cm2 under the emission band. Investigation of this anomaly using spectroscopic techniques are described, and further, it is ascribed to the existence of a strong type-II offset between CuAlS2 and CdS layers. Besides their strong Stokes’ shift, CuAlS2/CdS QDs also exhibit high quantum yields (63%) as well as long emission lifetimes (~1500 ns). Finally the construction of a wide area transparent lighting device with a clear aperture of 7.5 cm2 is discussed. In Chapter four, the physical reason behind the stability of these I-III-VI2 QDs has been investigated. The optical properties of copper containing II-VI alloy quantum dots (CuxZn¬yCd1-x-ySe) were studied. Copper mole fractions within the host are varied from 0.001 to 0.35. No impurity phases are observed over this composition range. The optical absorption and emission spectra of these materials are observed to be a strong function of copper mole fractions, and provide information regarding composition induced impurity-impurity interactions. In particular, the integrated cross section of optical absorption per copper atom changes sharply with mole fraction of copper around 12%, suggesting a composition induced change in local electronic structure. In chapter five as photo reductive solar energy harvesters, it is shown that newly synthesized CuAlS2/ZnS QDs offer unprecedented advantages: these are composed of completely biocompatible, earth abundant, inexpensive elements; these exhibit very high solar to chemical energy conversion efficiencies and finally, light harvesting via these materials may be set up to reduce the carbon dioxide already present within the earth’s atmosphere. CuAlS2/ZnS structures can reduce aqueous bicarbonate ions to formate under visible light. The high turnover numbers (>7x104 molecules of sodium formate produced per QD), solar to chemical energy conversion efficiencies (20.2 +/- 0.2) are rationalized through our spectroscopic studies that show a short 550 fs electron dwell times in these structures. The high energy efficiency and the environmentally friendly composition of these materials suggest a future role in solar light harvesting.
DST, IISc, ISRO

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Chang, Yu-Chuan, and 張毓娟. "Quantum-Dot-Sensitized Photocatalytic Water Splitting Hydrogen Generation and Solar Cells." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/32016270445146622043.

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碩士
臺灣大學
化學研究所
98
Global warming much attention in recent years, and the oil will eventually run out, so people positively develop the natural resources of materiaproduction and solar cell have become an important direction of development. It is necessary to develop novel working electrode in order to improve its energy conversion efficiency. In this study, utilizing hydrothermal method to grow high-isotropic one-dimensional zinc oxide nanorods on fluorine-doped tin oxide substrate as the working electrode. Synthesis of cadmium telluride or mercury cadmium telluride quantum dots as photosensitizer. Then quantum dots attached to zinc oxide nanorods on the working electrode, and then successfully produced functional effects of a photosensitive compound semiconductor films. In this study, cadmium telluride and mercury cadmium telluride quantum dots adsorbed on the surface of zinc oxide nanorods. Using quantum dots absorb visible light in the red side band of the region to enhance the photocurrent and thus enhance the photoelectric conversion efficiency, which had successfully enhanced quantum dots-sensitized photocatalytic water splitting and quantum dot-sensitized solar cell efficiency. The results showed that the efficiency of cadmium telluride quantum dots join to ZnO nanorods increased from 0.66% to 1.83%, which enhance the efficiency of about 200%, and the efficiency of mercury cadmium telluride quantum dots join to ZnO nanorods increased from 0.66% to 2.24%, which enhance the efficiency of about 240%. In addition to doing cell toxicity test of the cadmium telluride and mercury cadmium telluride quantum dots and finding that cadmium telluride and mercury cadmium telluride quantum dots have a role in induced cell death. This will inhibit the cell growth. Therefore, further on the mechanism of quantum dots for analysis of apoptosis.

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Kao, Li-Cheng, and 高立誠. "Quantum-Dot-Sensitized Titanium Dioxide Nanorod Array Applied to Solar Photocatalytic Reaction." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/30542554651640308120.

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碩士
國立臺灣大學
地質科學研究所
99
Global warming has become a universal topic in these days. The clean and recyclable energy is an important topic for us. Hydrogen generation from photocatalytic water splitting is a green process that ensures generating energy without pollution. Therefore it’s vital to investigate the photoelectrode materials for improving its energy conversion efficiency. In this study, we fabricate highly ordered one-dimensional titanium oxide nanorod array on fluorine-doped tin oxide substrate by hydrothermal method as photoelectrode materials. Owing to its large band gap, titanium dioxide (TiO2) has been limited by its poor utilization of solar energy. Synthesis of cadmium sulfide (CdS) or cadmium selenide (CdSe) quantum dots as photosensitizer can successfully extended its photoresponse to visible light. The results showed that the photoconversion efficiency (η) of cadmium sulfide quantum dots coating on TiO2 nanorod increased from 0.019 to 2.455%, and the photoconversion efficiency of cadmium selenide quantum dots coating on TiO2 nanorod increased from 0.019 to 0.916%. In addition, due to the transparent substrate, we design a double-sided CdS and CdSe quantum dot cosensitized TiO2 nanorod photoanode for photoelectrochemical (PEC) hydrogen generation. The result also showed improvement for photoconversion efficiency, and incident-photon-to-current-conversion efficiency (IPCE). The double-sided model improves IPCE values to 38.098 % under visible spectrum 660 nm. It also exhibits well photocatalytic activity in the photodegradation of methylene blue under solar simulator illumination.

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Dong, Zhen-Yu, and 董朕宇. "Photocatalytic reduction of carbon dioxide with H2O over ZnS-quantum dot inside SBA-15." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/53607720184863278416.

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Анотація:

碩士
國立中興大學
化學系所
103
Technological development in industry has generated a great amount of carbon dioxide, which has caused greenhouse effect. In order to solve the CO2 problem, we reduced CO2 to methanol through photoexcitation of ZnS quantum dot, a semiconductor photocatalysts. In this research, we synthesized water-dispersible 1-thioglycerol (TG)-capped ZnS-quantum dots. After that the photocatalyst combining absorbent and ZnS-quantum dots as composite materials is in host-guest manner. To increase the production yield, the photocatalytic reaction wavelength was adjusted to visible-light The nucleation-doping strategy, ZnS-quantum dots were doped with transition metal, such as Mn2+, Fe2+, Co2+, Ni2+ in aqueous solution, as a result, we used a transition metal-Mn2+ and Co2+ doped zinc sulfide-quantum dots as catalytic catalyst. These photocatalysts were comprehensively characterized by using nitrogen physisorption, XRD, SAXS, UV–Vis spectroscopy and TEM. Finally, the CO2 reducing reaction was carried out in a photocatalytic reaction chamber with the evolved gas pump into aqueous solution and the quantitative analysis was performed by NMR.

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Wu, Chung-Yi, and 吳重儀. "Preparation of CdS quantum dot/nitrogen-doped mesoporous TiO2 photocatalysts for hydrogen evolution under visible-light irradiation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/41218683708800639439.

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碩士
國立高雄應用科技大學
化學工程與材料工程系博碩士班
101
In this study, various methods including indirect and direct deposition and ionic exchange with/without bifunctional linker (MPA) were developed to prepare CdS quantum dots / nitrogen-doped mesoporous titania during evaporation-induced-self-assembly (EISA) process. A variety of different spectroscopic and analytical techniques, such as small- and wide-angle powder X-ray diffraction (XRD), Brunauer-Emmet-Teller (BET) analysis, Raman scattering spectroscopy (Raman), small angle X-ray scattering (SAXS), UV-visible spectroscopic (UV-vis), Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) were used to characterize the physicochemical properties of various materials. Photocatalytic splitting of water by the synthetic photocatalysts under visible light was also examined in this study. Among all CdS quantum dots / nitrogen-doped mesoporous titania, it the SAXS and BET results indicated that the photocatalysts prepared via ion-exchange method had the better mesoporous structure with highest specific surface areas of 69.4 m2/g. It was also found the more CdS quantum dots were deposited would lead to the decreased specific surface areas. It was observed that UV-visible reflectance spectra suggested that red shifted to the visible region (approximately 500 nm) upon the deposition of CdS quantum dots onto nitrogen-doped mesoporous titania. Among all the prepared photocatalysts under visible-light photocatalytic splitting of water, the photocatalysts fabricated by ion-exchange method had the highest amount of hydrogen production. This result showed that the mesoporous structure of photocatalysts with high specific surface areas and optimum CdS quantum dots would be favorable for photocatalytic evolution of hydrogen under visible light irradiation.

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Li, Hsiang-Tien, and 李享典. "Synthesis and Identification of ZnS Quantum Dot Inside Layered and Mesoporous Materials and Their Application in Photocatalytic Reactions." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/64935406401690061802.

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Анотація:

碩士
國立中興大學
化學系所
98
Greenhouse gases have caused global climate anomalies, and it will be more serious within the next few years. Therefore the reduction of carbon dioxide indeed becomes indispensable. The apporach of this study is to adsorb the carbon dioxide from the air to in a matrix with excellent CO2 adsorption capacity. Then carbon dioxide reduction is performed by using light to excite semiconductor photocatalyst to generate electron-hole pair. The matrices used in this study includes Layered Double Hydroxide (LDH) and SBA-15 mesoporous materials. LDH is a good gas matrix to adsorb carbon dioxide. SBA-15 with higher surface area and pore structure are also good for gas adsorption capacity. The use of zinc sulfide (ZnS) quantum dot as semiconductor photocatalyst is due to its high band gap as compared to other semiconductor photocatalyst. This band gap enables this quantum dot to perform the photocatalytic reduction of carbon dioxide.

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Частини книг з теми "Quantum Dot Photocatalysis"

Shandilya, Pooja, Pankaj Raizada, Anita Sudhaik, Adesh Saini, Reena Saini, and Pardeep Singh. "Metal and Carbon Quantum Dot Photocatalysts for Water Purification." In Water Pollution and Remediation: Photocatalysis, 81–118. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54723-3_3.

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Menéndez-Flores, Víctor Manuel. "A Visible Perception from the Nano-world: Visible Light-Active Metal Oxide Nanomaterials in Photocatalysis and Quantum Dot Engineering in Solar Cells." In Oxide Thin Films, Multilayers, and Nanocomposites, 303–16. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14478-8_14.

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Ben-Shahar, Yuval, and Uri Banin. "Hybrid Semiconductor–Metal Nanorods as Photocatalysts." In Photoactive Semiconductor Nanocrystal Quantum Dots, 149–74. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-51192-4_7.

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Balkus, Kenneth J. "Metal Oxide Nanotube, Nanorod, and Quantum Dot Photocatalysis." In New and Future Developments in Catalysis, 213–44. Elsevier, 2013. http://dx.doi.org/10.1016/b978-0-444-53874-1.00009-3.

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Sharma, Ekta, and Vaishali Thakur. "Application of Carbonaceous Quantum Dots in Solar Cells." In Carbonaceous Quantum Dots: Synthesis And Applications, 94–109. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815136265123010009.

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Carbonaceous Quantum Dots (CQDs) are gaining the interest of various research groups owing to their significant features, including water stability, biocompatibility, minimal cytotoxicity, chemical inertness and fluorescence which make them a good candidate in solar cells applications such as photocatalysis, solar energy conversion, photovoltaic solar cells, and Photoelectrochemical cells. CQDs are used in photocatalytic reactions because they can be used as electron sinks to stop the coupling of electron void pairs. The high coefficient of absorption and the broad spectrum of absorption improve the photocatalytic activity. In solar cells, the CQDs are used as sensitizers. CQDs are employed in solar energy generation because they are non-toxic and affordable. This chapter discusses the use of CQDs in solar cells.

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Luo, Jingpeng, Weiying Pang, Qingying Ye, and Dong Fu. "Fe-Cu Bimetallic Oxide Quantum Dots Coupled with g-C3N4 Nanosheets for Efficient Photo-Fenton Degradation of Phenol." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220343.

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Graphitized carbon nitride (g-C3N4), as a simple and green photocatalytic material, has been widely used in photocatalytic degradation. However, the photocatalytic activity of g-C3N4 was inhibited by poor visible light absorption and high photocarrier recombination rate. Metal quantum dots (Qds)/g-C3N4 nanosheets coupled catalysts have attracted more and more attention in the Fenton advanced oxidation process due to their high charge mobility and more active sites. In this work, heterogeneous photocatalysts of Fe-Cu bimetallic oxide quantum coupled with g-C3N4 nanosheets were prepared. It shows high activity in Fenton and photocatalytic system. Under the optimal conditions, the removal efficiency of 50 ppm phenol reached 99% after 60 min. The removal efficiency of the catalyst for phenol did not decrease significantly after four cycles of experiments, and the catalyst had good stability. The experimental results show that the synergy between g-C3N4 semiconductor photocatalytic oxidation technology and heterogeneous Fenton advanced oxidation technology has great practical significance.

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Reddy, N. Lakshmana, N. Ramesh Reddy, Santosh S. Patil, M. Mamatha Kumari, and M. V. Shankar. "Semiconductor Quantum Dots for Water Splitting and CO2 Photoreduction." In Recent Developments in Functional Materials for Artificial Photosynthesis, 275–307. The Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/9781839167768-00275.

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The energy crisis and environmental pollution caused by increasing population puts the world in a dangerous zone. Photocatalytic water splitting to generate hydrogen as a clean energy carrier and photocatalytic CO2 reduction are the best alternative techniques to solve the world's problems. In connection to this, quantum dots (QDs) based semiconductor photocatalysts have become one of the promising materials for energy and environmental applications. Their unique properties including high surface area, more active sites, and high electric conductivity make them super candidates for water splitting and CO2 reduction. Moreover, the composites of QDs with various combinations including metal oxide-based QDS, metal sulfides QDS, metal selenides-based QDs and graphene QDs have become important types of QDs that have been well-considered for photocatalytic water splitting and CO2 reduction applications. In this chapter, we have summarized the major catalytic and electronic properties of the as-mentioned QDs and their composites for energy and environmental applications. The prospects and developments of the semiconductor QDs photocatalysts for use in practical applications are also highlighted.

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Sakaguti, Luiz Gustavo, Leonardo Zavilenski Fogaça, Camila Fabiano de Freitas, Wilker Caetano, Vagner Roberto Batistela, and Mara Heloisa Neves Olsen Scaliante. "GQD purification study obtained by bottom-up route aiming at the production of photocatalysts." In METHODOLOGY FOCUSED ON THE AREA OF INTERDISCIPLINARITY- V1. Seven Editora, 2023. http://dx.doi.org/10.56238/methofocusinterv1-070.

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Recent studies have shown that heterostructures composed of metal semiconductors (SC) and graphene quantum dots (QDs) have a photocatalytic performance considerably higher than that of intrinsic metallic semiconductors, this is because the GQDs reduce the electronic recombination on the surface of the CS, being still associated with the displacement of the absorption band to larger wavelengths. In the present work, graphene quantum dots were synthesized through commercial lignin (LcGQD), using nitric acid for depolymerization followed by a hydrothermal process. Analyses of the material demonstrated an average particulate size of 10.9 nm, UV-Vis absorption similar to that of other structures described in the literature, but without the presence of nitrogen peaks in the carbon structure, besides a remarkable specificity in fluorescence. The LcGQD then has great potential for use in photocatalysis, sensors, and optoelectronics.

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Vyas, Shubang, Rameshwar Ameta, and Rakshit Ameta. "Application of quantum dots in photocatalysis." In Quantum Dots, 169–203. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-12-824153-0.00009-4.

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Oluwafemi, Oluwatobi Samuel, El Hadji Mamour Sakho, Sundararajan Parani, and Thabang Calvin Lebepe. "Photocatalytic applications of ternary quantum dots." In Ternary Quantum Dots, 225–35. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-818303-8.00012-5.

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Тези доповідей конференцій з теми "Quantum Dot Photocatalysis"

D., Anitha, and Anita R. Warrier. "Visible light driven photocatalysis of azo dyes using indium sulphide quantum dot – Ag metal nanoparticles embedded in nafion membrane." In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0019397.

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Islam, Syed Z., Namal Wanninayake, Allen D. Reed, Doo-Young Kim, and Stephen E. Rankin. "Synergistic effects of graphene quantum dot sensitization and nitrogen doping of ordered mesoporous TiO2 thin films for water splitting photocatalysis (Conference Presentation)." In Solar Hydrogen and Nanotechnology XI, edited by Chung-Li Dong. SPIE, 2016. http://dx.doi.org/10.1117/12.2237971.

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