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Gold for Plasmotics

Learn about the unique qualities of gold, silver, copper, platinum, and palladium nanoparticles. Discover why noble metals are corrosion-resistant and how relativistic quantum effects influence their chemistry. Explore the use of gold nanostructures in diverse fields like medicine, photonics, and computing. Uncover the advantages of shrinking gold to the nanoscale for enhanced surface properties and biomedical applications.

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Gold for Plasmotics

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  1. Gold for Plasmotics By Tom Heinrich

  2. Why is gold so special ?

  3. More facts about gold metal bonding Cubic-face-centered (111) lattice constant a~0,4 nm electron-dense n~5,98 E 28 m^(-3) [Xe] 4f->14 5d->10 6s->1 mean free path lamda = 42nm www.ww.tu-freiberg.de/mk/Dokumente/.../Vorlesung15.ppt‎

  4. Which elements do you use normaly for Nanopartikels ? The biggest manufacter produces nanoparticels out of nobel / royal metals. - Gold Nanoparticles - Silver Nanoparticles - Copper nanoparticles - Platinum and Palladium nanoparticles.

  5. What makes a metal nobel ? .... are metals that are particularly resistant to corrosion. Better solution for us : nobel metal = copper, silver, gold, completely filled d-bands no contribute to the conductivity and reactivity

  6. Let us have a closer look at copper, silver and gold. The 3 metals withe the most distinctive shining .

  7. How could it be that silver and gold have neary the same atomic radius ? Remember gold have 32 more protons than silver !

  8. http://www.businessinsider.com/biography-of-albert-einstein-2013-1http://www.businessinsider.com/biography-of-albert-einstein-2013-1 Sire pleace, the answer is :Relativistic quantum effect in chemistry

  9. What is the Relativistic quantum effect ? Properties of heavy atoms s-orbital electros have nearly speed of light mass growth --> contraction of the s orbitals s-electrons shild the nuclear charge the energy levels of the other orbitals is lifted up

  10. What does this mean for us ? Valence and conductor band approaching easier to stimulate elektros from d to s aka "Interbandanregung" for gold start at 520 nm (~ 2,38 eV) nearly free electrons in 6sp orbital

  11. Band-stucture of Gold

  12. Dielectric function Model of Drude-Sommerfeld electrons = findependent, point-like and effectively-free accelerate by external electric field decelerate Collisions with metal ions Г = T^( -1) with T = time between two hits --> Variancefactor --> only effectively-free electrons http://upload.wikimedia.org/wikipedia/commons/4/4d/Electrona_in_crystallo_fluentia.svg

  13. OK, but now seriosly why do the most of physicy use gold for thier experiments and not silver or copper ? Ask yourself with which spoon do you eat your "sunday-morning-egg" copper, silver or gold ?

  14. Problem : We were talking about Bluks ! http://www.vanillabanking.de/wp-content/uploads/2012/10/goldbarren-gold-bar.jpg

  15. Solution : let´s shrink to nanopartikel Über neue Synthesewege für ultrakleine, fluoreszente „Gold-Nanopartikel“ und deren Einbau in Materialien by Andre Schäfer

  16. Effects of shrinking to nanoscale Bigger surface by a minimum of volumina -> surface-energy lifted up -> other wavelength of the surface plasmos -> other absorbation of light discrete energy levels excited electron gas -> aktive chemical Gold nanostructures: engineering their plasmonic properties for biomedical applications

  17. Influence of the surface http://www.sigmaaldrich.com/content/dam/sigma-aldrich/materials-science/nanomaterials/gold-nanostructures/figure-1.jpg

  18. Where is the use ? Yesterday Coulering "Glas" Today Medicin, marking, Tomorrow Next generation of super-computers

  19. Contrast enhancement for optical imaging Spatially resolved spectra biological sample(Phantom) Hauptquelle Gold nanostructures: engineering their plasmonic properties for biomedical applications

  20. Contrast enhancement for optical imaging Gold nanostructures: engineering their plasmonic properties for biomedical applications

  21. All good things come to an end ... And so Fin

  22. My feelings about all of this.

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