کوانتوم دات روی اکسید

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Qoantum dot zinc OXIA ‏دنه‎ Omrani Dr.charmi 

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amirhossein omrany _ Preview Your Personal Website > I semnan University, Physics, Undergraduate | CMOS Technology +5 | + ۸۵0 2 amirhossein omrany مدو مم ع مه سوب ور ‎mutes ac ir:‏ Semiconductor device mode CMOS Technolagy TFT 

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At the end of the 1970s, Russian physicist Alexei Ekimov of the State Optics Institute Vavilov (Leningrad) synthesized nanocrystals of copper chloride and then of cadmium selenide in a molten glass matrix. He then observed a fluorescence and a gradient of colors. These first observations were published in 1980. Alexander Efros, another Russian physicist, published in 1982 the first theory aiming at explaining the behavior of these very small crystals by the confinement of their electrons. Inspired by Alexei Ekimov, the American chemist Louis Brus, Bell Labs (Murray Hill, New Jersey) tried and successfully produced nanocrystals, but in a liquid form, to obtain a colloidal suspension. In this way, he obtained the first colloidal Quantum Dots of cadmium sulphide, easier to «| JL handle, and published his results in 1983. 8 

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10 Alexei Ekimov obtained his PhD in physics in 1974 at the loffe Physical-Technical Institute in Leningrad. Researcher at the Vavilov State Optical Institute since 1977, he produced for the first time Quantum Dots in a molten glass matrix. Since 1999, Alexei Ekimov has been the Chief Scientist at Nanocrystals Technology Inc. (NYC, NY). In 2006, he won the Von Humboldt Award and the R. W. Wood Award from the Optical Society of America alongside Louis Brus and Alexander Efros for their discovery of Quantum Dots. In 2013, he shared, with Alexander Efros, the Gross Medal of the Russian Rozhdestvensky Optical Society. دانشگاه صنعتي مالك اشتر 

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Louis Brus, the Colloidal Quantum Dots discovery, 

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Louis Brus recieved his PhD at Columbia University in New York. He discovered the first colloidal Quantum Dots in 1982 in AT&T Bell Laboratories, where he later left in 1996 to join Columbia University. Louis Brus was elected to the United States Academy of Sciences in 2004. He shared the R. W. Wood prize of the Optical Society of America with two other Quantum Dots pioneers, Alexei Ekimov and Alexander Efros. In 2008, Louis Brus also won the Kavli prize for Nanoscience and the NAS Award in Chemical Sciences in 2010 as well as the Franklin Institute’s Bower Award & Prize for Achievement in ‏مالك اشتر‎ 6 ۷ ۰ 12 

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Alexander Efros obtained his PhD in 1978 at the Leningrad State Technical University. From 1981 to 1990, he was a researcher at the loffe Institute in Leningrad. In 1990 he became a researcher at the Technical University of Munich and was a visiting scholar at MIT (Cambridge, MA) in 1992. He held the position of consultant at the US Naval Research Laboratory (NRL) in Washington DC in 1993 before becoming a senior researcher. Alexander Efros shared with Alexei Ekimov and Louis Brus the R. W. Wood prize of the Optical Society of America for the discovery of Quantum Dots. In 2008, he received the Humboldt Research Award ‏اسر‎ Senior U.S. Scientists. ی ge 

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سس« ‎Early contributions to the Research on‏ Quain Europe, it is Arnim Henglein, German chemist who paved the way to Quantum Dots in Berlin since 1982. In Asia, Tadashi Itoh at Sendai in Japan started to work on CuCl Quantum Dots in solid matrices in 1984. In Bell Laboratories (Murray Hill, New Jersey), Louis Brus had two promising post-doctoral researchers, Moungi Bawendi and Paul Alivisatos, who would become important figures in the field of Quantum Dots. Moungi Bawendi would later be in charge of a team at MIT (Massachusetts). Paul Alivisatos will lead a team at UC Berkeley. In 1993, Moungi Bawendi was at the origin of the production of the first “high quality” Quantum Dots that have less than 5% size variation in the colloidal suspension. This enabled researchers to control the size of Quantum Dots and fine- tune the color of their fluorescence. Meanwhile, Philippe Guyot-Sionnest, a young professor at the University of Chicago, was interested in the multiphoton 0 in 1996, his team 15 

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The control of the surface chemistry and the shape of the quantum dots then becomes the primary objective of these researchers. The first rod-shaped Quantum Dots were produced in 2000 by a member of Paul Alivisatos’ team. At the end of the 2000s, the teams from MIT, the University of Berkeley, the University of Chicago and Hamburg are particularly active in the field of research on Quantum Dots. In 2014, a conference to celebrate the 30th anniversary of the discovery of Quantum Dots was held at ESPCI. Most 

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The Origin of Quantum Plates| In 2007, the team of Benoit Dubertret produced for the first time Quantum Plates at ESPCI (School of Physics and Chemistry of the City of Paris) ParisTech; flat crystals, a few atoms thick. This was an extremely important step forward. Compared to conventional Quantum Dots, Quantum Plates are brighter, easier to implement for industrial applications, more heat resistant once encapsulated, and more stable over time. In addition, their emission is naturally polarized and directional. 17 دانشگاه صنعتي مالك اشتر 

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18 Towards massive use of Quantu The optical properties of Quantum Dots make them great candidates to manufacture very high quality screens. They allow for better color rendering, with reduced energy consumption. They are already present in the high-end products of several manufacturers, including Samsung. However, their large-scale adoption still faces obstacles. The very small size of Quantum Dots makes it difficult to adapt production lines designed to handle about 1000 times larger phosphors. Quantum Dots are also degraded by the oxygen and water molecules present in ambient air. They have to be placed between very expensive protective films. Finally, the best performing Quantum Dots contain too many heavy metals to be RoHS compliant. The manufacture of Quantum Dots solves this last point, without provi and at the expense of performance. onversely, the encapsulation method developed at Nexdot ithout heavy metals partially ig a solution to the first two, Dots |0 تي مالك اشتر overcomes all these obstacles, without impact on performance. 

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23 نانو ذرات اکسید روی به عنوان یکی از مهم ترین نانو ذرات اکسید فلزی» به علت دارا بودن خواص فیزیکی و شیمیایی ویژه, به طور گسترده در زمینه های مختلف به کار می رود. 2810, پودر سفید رنگی است که در آب نامحلول است. اکسید روی دو ساختار کریستالی دارد: ۷۷118۲2178 شش وجهی و ۴ مکعیی که ساختار ‎WURTZITE‏ ‏پایدارترین ساختار در دمای محیط و به همین علت معمول تر است. 0 دارای اتصال الکتروشیمیایی بزرگی است که همین امر خواص پیزو و پیرو الکتریک قوی ایجاد می کند. این ذرات در مقایسه با ساير اکسیدهای فلزی, ارزان تر هستند و سمیت کمتری دارند که در کاریردهای زیست پزشکی کاربرد دارند. J دانشگاه صنعتي مالك اشتر 

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(ZnO QDs) Additional information Applications Photovoltaics (perovskites and organics), OLED, QLED Sensors Printed electronics Catalyst Functions Electron transfer Electron injection Hole blocking Sensing material Je Typical mean size ~5nm Methods of deposition Spin coating Dip coating Spray Coating: Ink jet f Zinc Oxide Quantum Dots BNSAALEM nies Appearance White, air-stable powde Excitation 330nm+ 5nm Emission (max.) 530 nm + 5nm FWHM 135nm+ 5nm Core size 2- 10nm Solubility Colloidal solution in DMSO. دانشگاه صنعتي مالك اشتر 

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Zinc Oxide Quantum Dots (ZnO QDs), coated with butyrate ligands Highly purified hydrophobic Zinc Oxide Quantum Dots (ZnO QDs) coated with organic ligand shell without a presence of free organic ligand. Unique physicochemical properties: monodispersity, solution-stability, air-stability and bright luminescence upon excitation with UV. دانشگاه صنعتي مالك اشتر 

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Zinc Oxide Quantum Dots (ZnO QDs) coated with formate ligands Highly purified hydrophobic Zinc Oxide Quantum Dots coated with short-chain organic ligands. Monodispersed, narrow size distribution, solution-stable, bright yellow luminescence upon excitation with UV. / دانشگاه صنعتي مالك اشتر 

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Zinc Oxide Quantum Dots (ZnO QDs) coated with metoxylate ligani CH; Zinc Oxide Quantum Dots (ZnO QDs) coated with myristate ligan / pons ge tons gf CH; 

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Zinc Oxide Quantum Dots (ZnO QDs coated with phenylacetate ligands, Clickable Zinc Oxide Quantum Dots (ZnO QDs) coated with 10- undecenoate ligands (CH2)5 بن 22 دانشگاه صنعتي مالك اشتر 

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کار رو ‎Siok‏ ‎JO‏ كا ‎duighy‏ 2 یی ‎Br lt‏ ‎bal‏ دیدشت ‎Lien tae SA igh rte‏ ‎SB she ‎Gace ste ‎eo‏ دانشگاه صنعتي مالك اشتر 

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31 دانشگاة ضنعتي مالك اشتر 

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32 OPTICAL PROPERTIES OF ZINC OXIDE QUANTUM, ROF Rent UV photoluminescence (PL) and absorption spectra of various sizes of zinc oxide (ZnO) quantum dots (QDs) give evidence for the quantum confinement effect. Bandgap enlargement is in agreement with the theoretical calculation based on the effective mass model for the size of ZnO QDs being comparable to the Bohr radius of bulk exciton. By using the modified spatial correlation model to fit the measured Raman spectra, we reveal that the Raman spectral shift and asymmetry for E2(high) mode are caused by localization of optical phonons. Furthermore, we ۴ temperature-dependent PL of different sizes of ZnO particles. The unobvious LO-phonon replicas of free exciton (FX) were observed when the ZnO particle sizes were under 12 nm in diameter. The increasing exciton energy (Eb) with the decreasing quantum dot size can be obtained from temperature-dependent PL. From the temperature-dependent change of FX emission energy, we deduce that the exciton-LO phonon coupling strength reduces as the particle size decreases. The reduced exciton Bohr radius aB with particle size obtained from Eb and PL spectrum confirms that the exciton becomes less polar in turn redudinguthelbréhlich interaction and the exciton-LO phonon interaction is اس ی و ‎a ee‏ یف باتوی من فنست 

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3 3 Fluorescence-enhanced gadolinium-doped zinc oxide quantum dots for magnetic resonance and fluorescence Abstract i i We report here the development 6! GPaeped ZnO quantum dots (QDs) as dual modal fluorescence and magnetic resonance imaging nanoprobes. They are fabricated in a simple, versatile and environmentally friendly method, not only decreasing the difficulty and complexity, but also avoiding the increase of particle’s size brought about by silica coating procedure in the synthesis of nanoprobes reported previously. These nanoprobes, with exceptionally small size and enhanced fluorescence resulting from the Gd doping, can label successfully the HeLa cells in short time and present no evidence of toxicity or adverse affect on cell growth even at the concentration up to 1 mM. These results show that such nanoprobes have low toxicity, especially in comparison with the traditional PEGylated CdSe/ZnS or CdSe/CdS QDs. In MRI studies, they exert strong positive contrast effect with a large longitudinal relaxivity (r,) of water proton of 16 mM-' s~!. Their capability of imaging HeLa cells with MRI implies that they have great potential as MRI contrast agents. Combining the high sensitivity of fluorescence imaging with high spatial resolution of MRI, We expect that the as-prepared Gd-doped ZnO QDs can rovide a better reliability of the collected data and find promising applications in 

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Zinc oxide quantum dots: multifunctional candidates for arresting C2C12 cancer cells and their role towards caspase 3 and 7 genes Abstract Recently, nanoscale (<100 nm) inorganic materials, especially spherical shaped zinc oxide quantum dots (ZnO-QDs), have received a lot of attention from the broad community because of their potential utilization in various technologies. Due to their large surface to volume (S/V) ratios and extremely high reactivities, they can easily penetrate in various biological identities, such as cells and proteins, and therefore can sense, diagnose and cure different biological systems. The present study describes the facile synthesis of crystalline ZnO-QDs viaa solution process. In addi in, C2C12 myoblast cancer cells have been treated with different doses of ZnO-QDs at different incubation times (24, 48, 72 and 96 h). The rate of inhibition of cells was observed using an MTT assay, whereas the morphology of the cells was observed by confocal microscopy (CLSM). The MTT and CLSM investigations confirmed that with an increase in the incubation time, the population density of cancer cells was decreased when treated with ZnO-QDs. The dose dependent apoptosis correlated with intracellular production of reactive oxygen species (ROS) from C2C12 cancer cells was also measured in presence of ZnO-QDs. Moreover, the effect/apoptosis of these QDs was also checked in the presence of candidate genes such as caspase 3/7 h GAPDH. Reverse transcription polymerase chain reaction (RT-PCR) analysis demonstrates the up- regulation of caspase 3/7 genes in cells subsequently treated with ZnO-QDs at low and high concentrations. 7 دانشگاه صنعتي مالك اشتر 

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نانوذره اکسید روی کوانتوم دات» سلول‌های سرطانی» رامی مخترع و محقق دانشگاه آزاد اسلامی از ثبت اختراع و کار روی پروژه تحقیقاتی سخن می‌گوید که نتیجه نهایی آن نشان می‌دهد «نانوذره اکسید روی کوانتوم دات» توانست سلول‌های سرطانی را به‌صورت کامل از بین ببرد. 7 دانشكاه صنعتي مالك اشتر U 

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Got bo ‘Nacleolas, ne ey “Mitochondria ‏وو جل-د-‎ Lysosome Endoplasmic | ‏سين‎ ‏لت‎ ae Interaction of ۳23 on the surface of Cells Damaged cells by the Damaged cell surface ee the ال 1 ۲ 4 —— 36 دانشگاه صنعتي مالك اشتر 

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Zinc oxide quantum dots for textile dyes and real industrial wastewater treatment: Solar photocatalytic activity, ‏عع معء دع م ربوم‎ properties and recycling process Three samples of ZnO quantum dots (ZQDs) were synthesized by a modified sol-gel method at different temperatures for 3h. The first sample (S1) was prepared at room temperature 27 °C, while second and third samples (S2) and (S3) were prepared by the calcination process at 500 and 900 °C, respectively. A study of XRD and TEM determines the purity, high crystallinity and the presence of elongated shape of the prepared catalysts. On using TEM, DRS and EBT analysis, the crystallite size values, bandgap energy, and active surface area were (7.1 nm, 3.49 eV, and 150.1 m?/g), (9.8 nm, 3.45 eV and 112.2 m?/g) and (13.5 nm, 3.39 eV and 78.94 m?/g) for S1, S2, and S3, respectively. The Photoluminescence properties showed that the fluorescence rate for S1 was doubled the observed one in the S2 sample. The photodegradation results of both methyl orange as an industrial raw material and real industrial wastewater of S1 sample showed the finest activity when compared with the rest samples. It was cleared from the collecting data that the photocatalytic | ‏یی‎ decreases with the crystallite ze increases The mineralization ciency of the real industrial wastewater that exposed to sunlight for six 

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30; ]1[ 20: + 8,0 1,0: ]8[ 26 + ,0 [12] م80 --26 ع ‎7am‏ سدق ‎Valnce band reaction‏ ‎۱ + _Dye ~ oxidized dye [4] 2 ‎0 ‏آگاه صنعتي مالك اشتر ‎ 

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۱۵۳۲۵۲۲۸۵۲۱6۵ ۵۴ 2186 oxide quantum dots coated paper and Ab&PPlication of fluorescent anti-counterfeiting Fluorescent anti-counterfeiting is one of the most widely used anti. counterfeiting technologies at present. The demand to develop new anti- counterfeiting materials and technology is more and more urgent. oxide quantum dots (ZnO QDs) have superior fluorescent properties under ultraviolet light, making them a suitable replacement for traditional Phosphors for anti-counterf which is environmentally friendly and meets the needs of sustainable development. In this paper, water-soluble ZnO QDs with an average particle e of 5.64 nm were prepared. Paper coated by ZnO QDs was obtained after ultrasonic treatment, which could emit bright yellow fluorescence when excited by ultraviolet light. As the concentration of ultrasonic solution is increased, the loading amount of ZnO QDs on the coated paper increased gradually, reaching the maximum when the concentration is increased to lmolL-1, which then does not change with an increase in concentration. The fluorescent intensity of the coated paper was consistent with the changing pene of the, loading amount. The coated paper has excellent optical “stability,” ‘is’ easy to recycle, and provides simple identification of 

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1. Abou-Mohamed G, Papapetropoulos A, Catravas JD, Caldwell RW. 1998. Zn* inhibits nitric oxide formation in response to lipopolysaccharides: implication in its anti- inflammatory activity. Eur / Pharmacol 341: 265- 72. 2. Branen JK, Davidson PM. 2004. Enhancement of nisin, lysozyme, and monolaurin antimicrobial activities by ethylenediaminetetraacetic acid and lactoferrin. Int J Food Microbiol 90: 63- 74. 3. CDC. 2001. Outbreaks of multidrug-resistant Salmonella Typhimurium associated with veterinary facilities—Idaho, Minnesota, and Washington, 1999. MMWR Morb Mortal Wkly Rep 50: 701- 4. 3 4 . Huang Z, Maness PC, Blakee DM, Wolfrum EJ, Smoliski SL, Jacoby WA. 2000. Bacterial mode of titanium dioxide photocatalysis. J) Photochem Photobiol A: Chem 130: 163- 70. ‎J 43‏ دانشگاه صنعتي مالك اشتر 

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5. Hughey VL, Johnson EA. 1987. Antimicrobial activity of lysozyme against bacteria involved in food spoilage and food-borne disease. App! Environ Microbiol 53: 2165- 70. 6. Leasor SB, Foegeding PM. 1989. Listeria species in commercially broken raw liquid whole egg. J Food Prot 52: 777- 80. 7. Lim Y, Levy M, Bray TM. 2004. Dietary zinc alters early inflammatory responses during cutaneous wound = healing in weanling CD-1 mice./ MNutr134: 811-6. 8. Lopes de Romana D, Brown KH, Guinard JX. 2002. Sensory trial to assess the acceptability of zinc fortificants added to iron-fortified wheat products. J Food Sci 67: 461-5. ‎J 44‏ داتشكاه صنعتي مالك اشتر 

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45 9. Moore J, Madden RH. 1993. Detection and incidence of Listeria species in blended raw egg. / Food Prot 56: 652- 60. 10. Moraru Cl, Panchapakesan CP, Huang Q, Takhistove P, Liu S, Kokini JL. 2003. Nanotechnology: a new frontier in food science. Food Technol 57(12): 24- 9. 11. [NIH] Natl. Inst. of Health. 2007. Office of dietary supplements: fact about dietary supplements. Available from: http://ods.od.nih.gov/factsheets/cc/zinc.html. Accessed Jul 7, 2008. 12. Okouchi S, Murata R, Sugita H, Moriyoshi Y, Maeda N. 1995. Calorimetric evaluation of the antimicrobial activities of calcined dolomite. J Antibact Antifungal Agents 26: 109- 14 (in Japanese). a / 

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13. Payne KD, Oliver SP, Davidson PM. 1994. Comparison of EDTA and apo-lactoferrin with lysozyme on the growth of foodborne pathogenic and spoilage bacteria. J) Food Prot 57: 62- 5. 14 . Sawai J, Yoshikawa T. 2004. Quantitative evaluation of antifungal activity of metallic oxide powders (MgO, CaO and ZnO) by an indirect conductimetric assay. J Appl Microbiol 96: 803- 9. 15. Sawai J, Shoji S, Igarashi H, Hashimoto A, Kokugan T, Shimizu M, Kojima H. 1998. Hydrogen peroxide as an antibacterial factor in zinc oxide powder slurry. J Ferment Bioeng 86: 521- 2. oe fe 46 

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Thank You.