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By Marcus Fuentes Texas A&M University Kingsville.

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Presentation on theme: "By Marcus Fuentes Texas A&M University Kingsville."— Presentation transcript:

1 By Marcus Fuentes Texas A&M University Kingsville

2  Special Semiconductor that emits light  It comes in an assortment of sizes  Sizes determine the color of light is seen

3  Some quantum dots are formed because a small region of one material burring in another with a larger band gap  Some form spontaneously in quantum well structures  A few self assembled form a nucleus spontaneously  And some can be created from two dimensional electrons or gases present in remotely doped quantum wells or semiconductor heterostructures

4  Colloidal synthesis is the cheapest and least toxic  Electrochemical techniques involve templates that are created by an ionic reaction that in turn create quantum dots  Pyrolytic synthesis involves the production of large numbers of quantum dots that self- assemble into preferential crystal sizes

5  Detection of tumors  Used as a substitute for organic dyes  Silicon photovoltaic cells  Light-emitting diodes and other light sources  Used to battle counterfeit money Look at what I can do  Toxicity  High cost of manufacturing  Unable to accurately predict Drawbacks

6  Quantum dot is an iridescent nanomaterial  Fabrication is expensive  New applications found everyday  Growing advantages in the medical field  Manufacturing is random and toxicity is a possibility

7 Reed MA, Randall JN, Aggarwal RJ, Matyi RJ, Moore TM, Wetsel AE (1988). "Observation of discrete electronic states in a zero-dimensional semiconductor nanostructure". Phys Rev Lett 60 (6): 535-537. PMID 10038575. (1988).[1]PMID 10038575[1] Reed MA (1993). "Quantum Dots" (PDF). Scientific American 268 (1): 118. Quantum Dots Murray CB, Norris DJ, Bawendi MG (1993). "Synthesis and characterization of nearly monodisperse CdE (E = S, Se, Te) semiconductor nanocrystallites" (PDF). J Am Chem Soc 115: 8706-15. Synthesis and characterization of nearly monodisperse CdE (E = S, Se, Te) semiconductor nanocrystallites Peng ZA, Peng X (2001). "Formation of high-quality CdTe, CdSe, and CdS nanocrystals using CdO as precursor" (PDF). J Am Chem Soc 123: 183-4. Formation of high-quality CdTe, CdSe, and CdS nanocrystals using CdO as precursor Wang C, Shim M, Guyot-Sionnest P (2001). "Electrochromic nanocrystal quantum dots" (PDF). Science 291: 2390-2. Electrochromic nanocrystal quantum dots Michalet X, Pinaud FF, Bentolila LA, et al (2005). "Quantum dots for live cells, in vivo imaging, and diagnostics". Science 307 (5709): 538-44. DOI:10.1126/science.1104274. PMID 15681376. DOI10.1126/science.1104274PMID 15681376 Shim M, Guyot-Sionnest P (2000). "n-type colloidal semiconductor nanocrystals" (PDF). Nature 407 (6807): 981-3. DOI:10.1038/35039577. PMID 11069172. n-type colloidal semiconductor nanocrystalsDOI10.1038/35039577PMID 11069172 Buhro WE, Colvin VL (2003). "Semiconductor nanocrystals: Shape matters". Nature materials 2 (3): 138-9. DOI:10.1038/nmat844. PMID 12612665. DOI10.1038/nmat844PMID 12612665 Bandyopadhyay S, Miller AE (2001). "Electrochemically self-assembled ordered nanostructure arrays: Quantum dots, dashes, and wires", in Nalwa HS: Handbook of Advanced Electronic and Photonic Materials and Devices. ISBN 0125137451. ISBN 0125137451 Schaller RD, Klimov VI (2004). "High Efficiency Carrier Multiplication in PbSe Nanocrystals: Implications for Solar Energy Conversion". Phys Rev Lett 92 (18): 186601. DOI:10.1103/PhysRevLett.92.186601. High Efficiency Carrier Multiplication in PbSe Nanocrystals: Implications for Solar Energy Conversion DOI10.1103/PhysRevLett.92.186601 Bowers MJ, McBride JR, Rosenthal SJ. "White-Light Emission from Magic-Sized Cadmium Selenide Nanocrystals". J Am Chem Soc 127 (44): 15378-9. DOI:S0002-7863(05)05470-3 10.1021/ja055470d S0002-7863(05)05470-3. White-Light Emission from Magic-Sized Cadmium Selenide Nanocrystals DOIS0002-7863(05)05470-3 10.1021/ja055470d S0002-7863(05)05470-3


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