Articoli di riviste: "Metal dots"

1

DAGANI, RON. "Isolated metal dots wired electrochemically". Chemical & Engineering News 75, n. 38 (22 settembre 1997): 9–10. http://dx.doi.org/10.1021/cen-v075n038.p009a.

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CHEN, L. J., P. Y. SU, J. M. LIANG, J. C. HU, W. W. WU e S. L. CHENG. "SELF-ASSEMBLED METAL QUANTUM DOTS". International Journal of Nanoscience 03, n. 06 (dicembre 2004): 877–89. http://dx.doi.org/10.1142/s0219581x04002784.

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Long-range order of uniform in size and regular in shape 2D arrays of Au@TOAB-DT nanoparticles (4.9 nm) were formed by a displacement reaction of the outer-shells from tetraoctylammonium bromide (TOAB) to dodecanethiol (DT) molecules at room temperature. The displacement reaction has utilized both superior size and shape control of Au@TOAB nanoparticles and uniform dispersion capability of Au@DT nanoparticles to achieve an extraordinarily large in extent (3 μ m × 3 μ m ) regular nanoparticle lattice structure. Self-assembled NiSi quantum dot arrays have been grown on relaxed epitaxial Si 0.7 Ge 0.3 on (001) Si . The formation of the one-dimensional ordered structure is attributed to the nucleation of NiSi nanodots on the surface undulations induced by step bunching on the surface of SiGe film owing to the miscut of the wafers from normal to the (001) Si direction. The two-dimensional, pseudo-hexagonal structure was achieved under the influence of repulsive stress between nanodots.

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Sim, Lan Ching, Jia Min Khor, Kah Hon Leong e Pichiah Saravanan. "Green Carbon Dots for Metal Sensing". Materials Science Forum 962 (luglio 2019): 36–40. http://dx.doi.org/10.4028/www.scientific.net/msf.962.36.

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In this work, carbon quantum dots (C-dots) was successfully synthesized by hydrothermal treatment using dried leaves as green precursor for metal sensing. The performance of C-dots when detecting metal ions in water will be evaluated by testing with different types of metal stock solutions. Quenching effect of fluorescence C-dots solution was observed in the presence of different metal ions. C-dots is more selective towards Fe3+ compared to other metal ions.

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Nedeljković, J. M., M. I. Čomor, Z. V. Šaponjic, T. Rajh e O. I. Mićić. "Characterization of Metal Iodide Quantum Dots". Materials Science Forum 214 (maggio 1996): 41–48. http://dx.doi.org/10.4028/www.scientific.net/msf.214.41.

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Zheng, Jie, Philip R. Nicovich e Robert M. Dickson. "Highly Fluorescent Noble-Metal Quantum Dots". Annual Review of Physical Chemistry 58, n. 1 (maggio 2007): 409–31. http://dx.doi.org/10.1146/annurev.physchem.58.032806.104546.

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Yu, Jing, Meng Lu Wu, Na Song, Li Ning Yang e Jian Rong Chen. "Carbon Dots for Detection of Metal Ions". Applied Mechanics and Materials 556-562 (maggio 2014): 77–80. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.77.

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Carbon dots are novel fluorescent nanomaterials which have easy to preparation. They have good stability, low toxicity, environment-friendly and are widely used in biological imaging, biomedical, and biochemical analysis, metal reduction, fluorescence probe and optoelectronic devices. This paper summarized several new methods for the detection of metal ions with carbon dots.

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Radovanovic, Pavle V., Nick S. Norberg, Kathryn E. McNally e Daniel R. Gamelin. "Colloidal Transition-Metal-Doped ZnO Quantum Dots". Journal of the American Chemical Society 124, n. 51 (dicembre 2002): 15192–93. http://dx.doi.org/10.1021/ja028416v.

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Kupchak, I. M., D. V. Korbutyak, N. F. Serpak e A. Shkrebtii. "Metal vacancies in Cd1-xZnxS quantum dots". Semiconductor physics, quantum electronics and optoelectronics 23, n. 1 (23 marzo 2020): 66–70. http://dx.doi.org/10.15407/spqeo23.01.066.

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Wu, Peng, Ting Zhao, Shanling Wang e Xiandeng Hou. "Semicondutor quantum dots-based metal ion probes". Nanoscale 6, n. 1 (2014): 43–64. http://dx.doi.org/10.1039/c3nr04628a.

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Mal, J., Y. V. Nancharaiah, E. D. van Hullebusch e P. N. L. Lens. "Metal chalcogenide quantum dots: biotechnological synthesis and applications". RSC Advances 6, n. 47 (2016): 41477–95. http://dx.doi.org/10.1039/c6ra08447h.

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LI HONG-WEI e WANG TAI-HONG. "CORRELATED DISCHARGING OF InAs QUANTUM DOTS IN METAL-SEMICONDUCTOR-METAL STRUCTURE". Acta Physica Sinica 50, n. 10 (2001): 2038. http://dx.doi.org/10.7498/aps.50.2038.

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Wang, Aiwu, Yun-Long Hou, Fengwen Kang, Fucong Lyu, Yuan Xiong, Wen-Cheng Chen, Chun-Sing Lee et al. "Rare earth-free composites of carbon dots/metal–organic frameworks as white light emitting phosphors". Journal of Materials Chemistry C 7, n. 8 (2019): 2207–11. http://dx.doi.org/10.1039/c8tc04171g.

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Here we report a new type of white light-emission material that is free of rare earth metals, fabricated by conveniently compositing carbon dots (CDs) with Zr(iv)-based metal–organic frameworks (MOFs).

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Lütjering, G., D. Weiss, R. W. Tank, K. von Klitzing, A. Hülsmann, T. Jakobus e K. Köhler. "Metal-non-metal transition at the crossover from antidots to quantum dots". Surface Science 361-362 (luglio 1996): 925–29. http://dx.doi.org/10.1016/0039-6028(96)00566-3.

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14

Kumar, Vijay Bhooshan, Raj Kumar, Aharon Gedanken e Orit Shefi. "Fluorescent metal-doped carbon dots for neuronal manipulations". Ultrasonics Sonochemistry 52 (aprile 2019): 205–13. http://dx.doi.org/10.1016/j.ultsonch.2018.11.017.

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Pokutnyi, Sergey I. "Strongly absorbing light nanostructures containing metal quantum dots". Journal of Nanophotonics 12, n. 01 (17 agosto 2017): 1. http://dx.doi.org/10.1117/1.jnp.12.012506.

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16

Orlov, Alexei O., Islamshah Amlani, Geza Toth, Craig S. Lent, Gary H. Bernstein e Gregory L. Snider. "Correlated electron transport in coupled metal double dots". Applied Physics Letters 73, n. 19 (9 novembre 1998): 2787–89. http://dx.doi.org/10.1063/1.122591.

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17

Hewa-Rahinduwage, Chathuranga C., Xin Geng, Karunamuni L. Silva, Xiangfu Niu, Liang Zhang, Stephanie L. Brock e Long Luo. "Reversible Electrochemical Gelation of Metal Chalcogenide Quantum Dots". Journal of the American Chemical Society 142, n. 28 (3 giugno 2020): 12207–15. http://dx.doi.org/10.1021/jacs.0c03156.

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Lou, Yongbing, Yixin Zhao, Jinxi Chen e Jun-Jie Zhu. "Metal ions optical sensing by semiconductor quantum dots". J. Mater. Chem. C 2, n. 4 (2014): 595–613. http://dx.doi.org/10.1039/c3tc31937g.

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19

Osifchin, Richard G., Ronald P. Andres, Jason I. Henderson, Clifford P. Kubiak e Raymond N. Dominey. "Synthesis of nanoscale arrays of coupled metal dots". Nanotechnology 7, n. 4 (1 dicembre 1996): 412–16. http://dx.doi.org/10.1088/0957-4484/7/4/020.

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20

Mulvaney, P., L. M. Liz-Marzán, M. Giersig e T. Ung. "Silica encapsulation of quantum dots and metal clusters". Journal of Materials Chemistry 10, n. 6 (2000): 1259–70. http://dx.doi.org/10.1039/b000136h.

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21

Kim, Bok Hyeon, Dong Hoon Son, Seongmin Ju, Chaehwan Jeong, Seongjae Boo, Cheol Jin Kim e Won-Taek Han. "Effect of Aluminum on the Formation of Silver Metal Quantum Dots in Sol–Gel Derived Alumino-Silicate Glass Film". Journal of Nanoscience and Nanotechnology 6, n. 11 (1 novembre 2006): 3399–403. http://dx.doi.org/10.1166/jnn.2006.020.

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The effect of aluminum incorporation on silver metal quantum dots formation in the alumino-silicate glass film processed by sol–gel process was investigated. The sol–gel derived glass was coated onto the silica glass plate by spin coating with the mixture solution of tetraethyl orthosilicate (TEOS), C2H5OH, H2O, AgNO3, Al(NO3)3·9H2O, and HNO3 with the molar ratios of Ag/Si = 0.12 and Al/Si varying from 0 to 0.12. The formation of the silver metal quantum dots was confirmed by the measurements of the UV/VISoptical spectra, the X-ray diffraction patterns, and the transmission electron microscope images. While the radius of silver metal quantum dots increased with the increase of aluminum concentration, the concentration of the silver metal quantum dots decreased. The formation of the silver metal quantum dots was found strongly suppressed by incorporation of aluminum ions in the glass. The change in the glass structure due to the aluminum incorporation was investigated by the analysis of the Raman spectra. The silver ions in the glass contributed to form stable (Al:Ag)O4 tetrahedra by pairing with aluminum ions and thus clustering of silver metal quantum dots was hindered.

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22

Chen, Ying, Yue Cao, Cheng Ma e Jun-Jie Zhu. "Carbon-based dots for electrochemiluminescence sensing". Materials Chemistry Frontiers 4, n. 2 (2020): 369–85. http://dx.doi.org/10.1039/c9qm00572b.

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This review summarizes the recent development of ECL sensors based on carbon-based dots. Particularly, various analytical approaches involving metal ions, small molecules, proteins, nucleic acids and cells are thoroughly presented.

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23

Khveshchenko, Dmitri V. "Connecting the SYK Dots". Condensed Matter 5, n. 2 (1 giugno 2020): 37. http://dx.doi.org/10.3390/condmat5020037.

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We study a putative (strange) metal-to-insulator transition in a granular array of the Sachdev–Ye–Kitaev (SYK) quantum dots, each occupied by a large number N ≫ 1 of charge-carrying fermions. Extending the previous studies, we complement the SYK couplings by the physically relevant Coulomb interactions and focus on the effects of charge fluctuations, evaluating the conductivity and density of states. The latter were found to demonstrate marked changes of behavior when the effective inter-site tunneling became comparable to the renormalized Coulomb energy, thereby signifying the transition in question.

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24

Wang, Jun, Yan Li, Bo-Ping Zhang, Dan-Dan Xie, Juan Ge e Hui Liu. "Photoluminescence Properties Research on Graphene Quantum Dots/Silver Composites". Journal of Nanoscience and Nanotechnology 16, n. 4 (1 aprile 2016): 3480–88. http://dx.doi.org/10.1166/jnn.2016.11892.

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Graphene quantum dots (GQDs) possess unique properties of graphene and exhibit a series of new phenomena of 0 dimension (D) carbon materials. Thus, GQDs have attracted much attention from researchers and have shown great promise for many applications. Recently, many works focus on GQDs-metal ions and metal nanoparticles (NPs). Although, many researches point out that metal ions and metal NPs have significant effect on photoluminescence (PL) feature of GQDs, mainly focus on PL intensity. Here, for the first time, we reported that metal NPs also affected PL peak position which was dependent on the mix mechanism of metal and GQDs. When GQDs-silver (Ag) composite mixed by physical method and excited at a wavelength of 320 nm, PL peak position of composites first showed blue-shifted then red-shifted with increasing of Ag content. However, if GQDs-Ag composite prepared by chemical method, PL peak position of the composites blue-shifted. Furthermore, the shift of PL peak position of GQDs-Ag prepared both for physical and chemical method displayed excitation-dependent feature. When the excitation wavelength approached to Ag SPR peaks, no obvious PL shift was observed. The mechanism for different PL shifts and the phenomenon of excitation-dependent PL shift as well as the formation mechanism of GQDs-Ag composite by chemical method are discussed in detail in this paper.

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Robinson, J. T., e O. D. Dubon. "Ge Island Assembly on Metal-Patterned Si: Truncated Pyramids, Nanorods, and Beyond". Journal of Nanoscience and Nanotechnology 8, n. 1 (1 gennaio 2008): 56–68. http://dx.doi.org/10.1166/jnn.2008.n17.

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The organization of semiconductor nanostructures into functional macroassemblies remains a fundamental challenge in nanoscience and nanotechnology. In the context of semiconductor epitaxial growth, efforts have focused on the application of advanced substrate patterning strategies for the directed assembly quantum-dot islands. We present a comprehensive investigation on the use of simple metal patterns to control the nucleation and growth of heteroepitaxial islands. In the Ge on Si model system, a square array of metal dots induces the assembly of Ge islands into an extensive two-dimensional lattice. The islands grow at sites between the metal dots and are characterized by unique shapes including truncated pyramids and nanorods, which are programmed prior to growth by the choices of metal species and substrate orientation. Our results indicate that ordering arises from the metal-induced oxidation of the Si surface; the oxide around each metal dot forms an array of periodic diffusion barriers that induce island ordering. The metals decorate the island surfaces and enhanced the growth of particular facets that are able to grow as a result of significant intermixing between deposited Ge and Si substrate atoms.

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Ahmed, Hanan B., e Hossam E. Emam. "Environmentally exploitable biocide/fluorescent metal marker carbon quantum dots". RSC Advances 10, n. 70 (2020): 42916–29. http://dx.doi.org/10.1039/d0ra06383e.

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OKAMOTO, Yoichi, Kenya NIMURA, Hiroshi NAKASTUGAWA e Hisashi MIYAZAKI. "Proposal of New Fabrication Method for Metal Nano-dots". Journal of the Japan Society of Powder and Powder Metallurgy 65, n. 9 (15 settembre 2018): 548–53. http://dx.doi.org/10.2497/jjspm.65.548.

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Pitkänen, Leena, e André M. Striegel. "Size-exclusion chromatography of metal nanoparticles and quantum dots". TrAC Trends in Analytical Chemistry 80 (giugno 2016): 311–20. http://dx.doi.org/10.1016/j.trac.2015.06.013.

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Cailotto, Simone, Raffaello Mazzaro, Francesco Enrichi, Alberto Vomiero, Maurizio Selva, Elti Cattaruzza, Davide Cristofori, Emanuele Amadio e Alvise Perosa. "Design of Carbon Dots for Metal-free Photoredox Catalysis". ACS Applied Materials & Interfaces 10, n. 47 (29 ottobre 2018): 40560–67. http://dx.doi.org/10.1021/acsami.8b14188.

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Sharma, Lalit Kumar, Ravi Kant Choubey e Samrat Mukherjee. "Spin-flop in transition-metal-doped SnO2 quantum dots". Materials Chemistry and Physics 254 (novembre 2020): 123537. http://dx.doi.org/10.1016/j.matchemphys.2020.123537.

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31

Jin, Shan, Shuxin Wang, Ling Xiong, Meng Zhou, Shuang Chen, Wenjun Du, Andong Xia, Yong Pei e Manzhou Zhu. "Two Electron Reduction: From Quantum Dots to Metal Nanoclusters". Chemistry of Materials 28, n. 21 (19 ottobre 2016): 7905–11. http://dx.doi.org/10.1021/acs.chemmater.6b03472.

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32

Baquero, Edwin A., Wilfried-Solo Ojo, Yannick Coppel, Bruno Chaudret, Bernhard Urbaszek, Céline Nayral e Fabien Delpech. "Identifying short surface ligands on metal phosphide quantum dots". Physical Chemistry Chemical Physics 18, n. 26 (2016): 17330–34. http://dx.doi.org/10.1039/c6cp03564g.

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33

Li, Feng, Dayong Yang e Huaping Xu. "Non-Metal-Heteroatom-Doped Carbon Dots: Synthesis and Properties". Chemistry - A European Journal 25, n. 5 (16 novembre 2018): 1165–76. http://dx.doi.org/10.1002/chem.201802793.

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Sinzig, J., L. J. de Jongh, A. Ceriotti, R. della Pergola, G. Longoni, M. Stener, K. Albert e N. Rösch. "Molecular Magnetic Quantum Dots in Multivalent Metal Cluster Compounds". Physical Review Letters 81, n. 15 (12 ottobre 1998): 3211–14. http://dx.doi.org/10.1103/physrevlett.81.3211.

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35

Wei, Yifeng, Jun Yang e Jackie Y. Ying. "Reversible phase transfer of quantum dots and metal nanoparticles". Chemical Communications 46, n. 18 (2010): 3179. http://dx.doi.org/10.1039/b926194j.

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Artuso, R. D., e G. W. Bryant. "Hybrid Quantum Dot-Metal Nanoparticle Systems: Connecting the Dots". Acta Physica Polonica A 122, n. 2 (agosto 2012): 289–93. http://dx.doi.org/10.12693/aphyspola.122.289.

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37

A. Echeverry-Gonzalez, Carlos, e Vladimir V. Kouznetsov. "Carbon Dots: An Insight into Their Application in Heavy Metal Sensing". Recent Progress in Materials 03, n. 02 (1 dicembre 2020): 1. http://dx.doi.org/10.21926/rpm.2102015.

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The design of nanomaterials for application in diverse fields ranging from photovoltaic to fluorescence sensing is a research area of increasing interest. Recently, Quantum Dots (QDs), which are classified as semiconductor quantum dots (SQDs) and Carbon dots (CDs), have become a hot topic of investigation, owing to their extraordinary tunable fluorescence emission properties that render them excellent candidates for sensing metal ions. The detection of metal ions in aqueous solutions with high sensitivity is very important as these ions have toxicological and environmental impacts. In this short review, we have described the fluorescence emission properties of CDs and their application for the detection of different metal ions, such as Hg2+, Pb2+, Cu2+, Fe3+, Cd2+, and Cr6+.

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Ha Thanh Tung, Ha Thanh Tung, e Dang Huu Phuc Dang Huu Phuc. "Optical properties and dynamic process in metal ions doped on CdSe quantum dots sensitized solar cells". Chinese Optics Letters 16, n. 7 (2018): 072501. http://dx.doi.org/10.3788/col201816.072501.

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Cheng, Jinghui, Xiangge Zhou e Haifeng Xiang. "Fluorescent metal ion chemosensors via cation exchange reactions of complexes, quantum dots, and metal–organic frameworks". Analyst 140, n. 21 (2015): 7082–115. http://dx.doi.org/10.1039/c5an01398d.

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Silva, Karunamuni L., Leenah Silmi e Stephanie L. Brock. "Effect of metal ion solubility on the oxidative assembly of metal sulfide quantum dots". Journal of Chemical Physics 151, n. 23 (21 dicembre 2019): 234715. http://dx.doi.org/10.1063/1.5128932.

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41

Yarur, Francisco, Jun-Ray Macairan e Rafik Naccache. "Ratiometric detection of heavy metal ions using fluorescent carbon dots". Environmental Science: Nano 6, n. 4 (2019): 1121–30. http://dx.doi.org/10.1039/c8en01418c.

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42

Tvrdy, Kevin, Pavel A. Frantsuzov e Prashant V. Kamat. "Photoinduced electron transfer from semiconductor quantum dots to metal oxide nanoparticles". Proceedings of the National Academy of Sciences 108, n. 1 (13 dicembre 2010): 29–34. http://dx.doi.org/10.1073/pnas.1011972107.

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Quantum dot-metal oxide junctions are an integral part of next-generation solar cells, light emitting diodes, and nanostructured electronic arrays. Here we present a comprehensive examination of electron transfer at these junctions, using a series of CdSe quantum dot donors (sizes 2.8, 3.3, 4.0, and 4.2 nm in diameter) and metal oxide nanoparticle acceptors (SnO2, TiO2, and ZnO). Apparent electron transfer rate constants showed strong dependence on change in system free energy, exhibiting a sharp rise at small driving forces followed by a modest rise further away from the characteristic reorganization energy. The observed trend mimics the predicted behavior of electron transfer from a single quantum state to a continuum of electron accepting states, such as those present in the conduction band of a metal oxide nanoparticle. In contrast with dye-sensitized metal oxide electron transfer studies, our systems did not exhibit unthermalized hot-electron injection due to relatively large ratios of electron cooling rate to electron transfer rate. To investigate the implications of these findings in photovoltaic cells, quantum dot-metal oxide working electrodes were constructed in an identical fashion to the films used for the electron transfer portion of the study. Interestingly, the films which exhibited the fastest electron transfer rates (SnO2) were not the same as those which showed the highest photocurrent (TiO2). These findings suggest that, in addition to electron transfer at the quantum dot-metal oxide interface, other electron transfer reactions play key roles in the determination of overall device efficiency.

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Cheng, Jinghui, Xiangge Zhou e Haifeng Xiang. "Correction: Fluorescent metal ion chemosensors via cation exchange reactions of complexes, quantum dots, and metal–organic frameworks". Analyst 140, n. 22 (2015): 7827. http://dx.doi.org/10.1039/c5an90086g.

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Correction for ‘Fluorescent metal ion chemosensors via cation exchange reactions of complexes, quantum dots, and metal–organic frameworks’ by Jinghui Cheng, et al., Analyst, 2015, DOI: 10.1039/c5an01398d.

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Zhou, Tieli, Jinyi Zhang, Biwu Liu, Shihong Wu, Peng Wu e Juewen Liu. "Nucleoside-based fluorescent carbon dots for discrimination of metal ions". Journal of Materials Chemistry B 8, n. 16 (2020): 3640–46. http://dx.doi.org/10.1039/c9tb02758k.

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Chini, Mrinmoy Kumar, Vishal Kumar, Ariba Javed e Soumitra Satapathi. "Graphene quantum dots and carbon nano dots for the FRET based detection of heavy metal ions". Nano-Structures & Nano-Objects 19 (luglio 2019): 100347. http://dx.doi.org/10.1016/j.nanoso.2019.100347.

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46

Xiao, Lian, Huiyuan Guo, Shouxia Wang, Junli Li, Yunqiang Wang e Baoshan Xing. "Carbon dots alleviate the toxicity of cadmium ions (Cd2+) toward wheat seedlings". Environmental Science: Nano 6, n. 5 (2019): 1493–506. http://dx.doi.org/10.1039/c9en00235a.

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47

Su, Rigu, Qingwen Guan, Wei Cai, Wenjing Yang, Quan Xu, Yongjian Guo, Lipeng Zhang, Ling Fei e Meng Xu. "Multi-color carbon dots for white light-emitting diodes". RSC Advances 9, n. 17 (2019): 9700–9708. http://dx.doi.org/10.1039/c8ra09868a.

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Gorelik, V. S., e A. V. Friman. "Optical properties of photonic crystals filled with metal quantum dots". Bulletin of the Lebedev Physics Institute 38, n. 4 (aprile 2011): 105–10. http://dx.doi.org/10.3103/s106833561104004x.

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49

Ciotta, Erica, Stefano Paoloni, Maria Richetta, Paolo Prosposito, Pietro Tagliatesta, Chiara Lorecchio, Iole Venditti, Ilaria Fratoddi, Stefano Casciardi e Roberto Pizzoferrato. "Sensitivity to Heavy-Metal Ions of Unfolded Fullerene Quantum Dots". Sensors 17, n. 11 (14 novembre 2017): 2614. http://dx.doi.org/10.3390/s17112614.

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Kryuchenko, Yu V. "HYBRID NANOSTRUCTURES WITH QUANTUM DOTS A2B6 AND METAL NANOPARTICLES (REVIEW)". Optoèlektronika i poluprovodnikovaâ tehnika 51, n. 2016 (30 dicembre 2016): 7–30. http://dx.doi.org/10.15407/jopt.2016.51.007.

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Articoli di riviste sul tema "Metal dots"

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