Presentation Title

Doubly Resonant Sum Frequency Generation in Photosensitized Surfaces

Presenter Information

Abraham EstradaFollow

Faculty Mentor

Luis Velarde

Start Date

18-11-2017 2:15 PM

End Date

18-11-2017 3:15 PM

Location

BSC-Ursa Minor 42

Session

Poster 3

Type of Presentation

Poster

Subject Area

physical_mathematical_sciences

Abstract

Sum frequency generation (SFG) spectroscopy is a method of obtaining measurements of electronic and vibrational modes of surface molecules by overlapping broad band IR wavelengths and narrow band visible wavelengths. FTIR, Raman, UV-VIS are other methods used to obtain vibrational or electronic information; however, none of these methods can be used to selectively obtain information of interfacial species. SFG’s of two different photosensitizers, Rhodamine 6G and, CdSe quantum dots with TOPO ligands were obtained. Using SFG with fixed IR wavelengths and varying visible wavelengths, electronically resonant and non-resonant spectra were acquired. A UV-Vis spectrum was obtained for the quantum dots, and was used to estimate what visible beam to use for the SFG; in addition, it was used to obtain the size of the quantum dots. Rhodamine 6G was observed on quartz and gold surfaces, both spectra results were distinct, indicating different orientations of the molecule on the substrate. Rhodamine 6G and Quantum Dots are very important, because they can be tuned to absorb specific wavelengths, which is very useful for the application to solar cells.

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Nov 18th, 2:15 PM Nov 18th, 3:15 PM

Doubly Resonant Sum Frequency Generation in Photosensitized Surfaces

BSC-Ursa Minor 42

Sum frequency generation (SFG) spectroscopy is a method of obtaining measurements of electronic and vibrational modes of surface molecules by overlapping broad band IR wavelengths and narrow band visible wavelengths. FTIR, Raman, UV-VIS are other methods used to obtain vibrational or electronic information; however, none of these methods can be used to selectively obtain information of interfacial species. SFG’s of two different photosensitizers, Rhodamine 6G and, CdSe quantum dots with TOPO ligands were obtained. Using SFG with fixed IR wavelengths and varying visible wavelengths, electronically resonant and non-resonant spectra were acquired. A UV-Vis spectrum was obtained for the quantum dots, and was used to estimate what visible beam to use for the SFG; in addition, it was used to obtain the size of the quantum dots. Rhodamine 6G was observed on quartz and gold surfaces, both spectra results were distinct, indicating different orientations of the molecule on the substrate. Rhodamine 6G and Quantum Dots are very important, because they can be tuned to absorb specific wavelengths, which is very useful for the application to solar cells.