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Wednesday, February 6, 2019

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Posted: Thursday, January 31, 2019

Chemistry-Physics 2019 Alumni Seminar Series: 'Quantifying Analyte-Porous Silicon Interactions' - February 7

Please join the Chemistry and Physics departments for the seminar "Quantifying Analyte-Porous Silicon Interactions," presented by alumnus Ari Darlow, B.S. '13, Ph.D. candidate in the University at Buffalo's Department of Chemistry, on Thursday, February 7, from 12:15 to 1:30 p.m. in Science and Mathematics Complex 173.

Abstract
Porous silicon (pSi) has been studied for many applications, including chemical sensing. A key to success in any sensing platform is understanding the analyte-pSi interactions and being able to selectively control them. One often uses the intrinsic pSi photoluminescence (PL) as the signal transduction method in pSi-based sensing applications and sensing platforms have been developed by using as prepared, H-passivated and oxidized pSi (ap-, ox-pSi). Although PL-based measurements have proved valuable, they provide limited detail into the mechanism of interaction between the Si nanocrystallites and the analyte. To address this shortfall, my research has centered on exploiting Fourier transform infrared (FTIR) and Raman spectroscopy to elucidate how gaseous analytes affect the pSi surface chemistries (i.e. Si-O-Si, SiHx (x = 1-3) and OySiH (y = 1, 2) band amplitudes and energies) and amorphous and nanocrystalline Si phonon band amplitudes and their energies. My results reveal an interesting relationship between the analyte-dependent PL, IR, and Raman responses and help shed light on the PL-based analytical signal origin. Infrared Spectroscopy can be a useful tool for biological imaging. My talk will also cover an ongoing research collaboration with the UB medical school.

Submitted by: Sujit Suwal
Also appeared:
Monday, February 4, 2019
Wednesday, February 6, 2019
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