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Progress and Paper report

Progress and Paper report. Sept 23, 2009. Progress. SPP Manuscript was accepted Evaporation of a multilayer coating with low transmission in the Infrared region A. K. Ang1, P.V. Ramos, M. L. Jamero and I. B. Culaba. Introduction.

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Progress and Paper report

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  1. Progress and Paper report Sept 23, 2009

  2. Progress • SPP Manuscript was accepted Evaporation of a multilayer coating with low transmission in the Infrared region • A. K. Ang1, P.V. Ramos, M. L. Jamero and I. B. Culaba

  3. Introduction • 1970’s energy crisis led to research focused on conserving energy • German researchers found windows as one of the biggest “heat holes” • Heat insulating coatings on windows

  4. Introduction • BiOx/Au/BiOx, ZnS/Au/ZnS, glass/BiOx/PbOx/Ag/PbOx/BiOx, TiO2/Ag/ZnO and TiO2/Ag/TiO2 systems • Silver based systems • Lowest thermal transmission • Highest visible light transmission

  5. Introduction • Similar optical properties of Ag, Au, Al, Cu

  6. Design • Cr/Cu/Cr on glass substrates • Cr adhesion layer • Cu layer as the main mirror • Third Cr layer for suppression of surface oxidation, preserving its optical properties

  7. Methodology • 36.5mmx 25.5mmx 1.1mm glass slides • Cleaning procedure for glass • N2 gas • KOH solution • KOH + CaCO3 • HNO3 • Distilled water • 2-propanol • Breathe test

  8. Slides Thickness monitor Substrate holder Methodology

  9. Methodology • Base pressure of 10-5 torr • Chromium layers • Cr-coated tungsten rod at 90A • Copper layers • Mb dimpled boat at 180A

  10. Methodology • Ocean Optics USB-2000 Spectrophotometer • 400nm-800nm • Shimadzu IRAffinity 1 FT-IR Spectrophotometer • 2000nm-20000nm • 800nm-2000nm • No data

  11. Results and discussions

  12. 8μm 8μm 8μm 8μm A B D C Results and discussions

  13. Results and discussions

  14. Results and discussions

  15. Results and discussions • in a study conducted by Hass, the percent reflectance of copper films in the 800-2000nm region is constant at around 90% [9]. With such high reflectance in this region, the percent transmission is expected to be minimal, which agrees with the data in Fig. 2.

  16. Conclusion • “Thus Cr/Cu/Cr coatings, having minimal infrared transmission and transmission peaks in the visible region, can be used as a heat insulating system coated on windows”

  17. Sample 4 Progress • Collected new data in visible region Sample 3 Sample 2 Sample 1

  18. Progress • Also collected data in the visible region using Shimadzu UV PC Spectrophotometer • Double beam spectrophotometer • Data still not retrieved from Chem department PC

  19. Progress • Performed adhesion test for first 4 samples

  20. Progress

  21. Progress • Fabricated new samples • Deposition time as basis of film thickness • 20 sec of Cr deposition at 90 A 4 nm/sec x 20 sec = 8 nm • Cu deposition at 180 A • 20, 30, 60, 180 sec samples were already fabricated

  22. IR thermometer Heat shield Mask Heat absorbing plate Progress • Set up for heat insulating tests 150W lamp

  23. Things to do • Test heat shield properties • Purity test for Cu used in evaporation • Acquire coated window samples from UPPA • Compare heat shielding properties of these with Cr/Cu/Cr samples

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