Discipline: Nanoscience or Materials Science
Subcategory: Materials Science
Session: 2
Room: Exhibit Hall
Elias Anwar - Norfolk State University
Co-Author(s): Leila Hesami, Center for Materials Research - Norfolk State University, Norfolk, VA; Chi Yang, Center for Materials Research - Norfolk State University, Norfolk, VA; Natalia Noginova, Center for Materials Research - Norfolk State University, Norfolk, VA; Mikhail Noginov, Center for Materials Research - Norfolk State University, Norfolk, VA
The objective of this project was to monitor and characterize photopolymerization of a synthesized monomer, [2,2′-Bi-1H-indene]-1,1′-dione-3,3′-diyl diheptanoate (BITh), across metal, dielectric, and metal-dielectric substrates. The illumination source being using to induce photopolymerization of the monomer molecules was a UV-visible Xe lamp. The monomer was spin coated onto the substrate and illuminated with the lamp. In order to monitor the occurrence of photopolymerization, specifically both its rate and magnitude, the intensity of the absorption band around 480 nm was determined. This was because it was present in the monomer but not in the polymer, and with that, as the pumping intensity increased, so did the rate of photopolymerization. When looking at the monomer on top of a thin film of MgF2 and Ag, the rate of photopolymerization is relatively higher than expected, due to the negation of the transfer of charge by the thin layer of dielectric on top of the metal. Some of the reason behind this can be attributed to the incident light’s and reflected light’s constructive interference among other energy transfer aspects affected by the metal/dielectric interface. The Au substrate showed some improvement of the rate of photopolymerization and the monomer film absorption, about a 50% improvement. As for the Ag substrate, the rate of photopolymerization is noticeably higher, about three times as much, most likely due to the ability of charge transfer to occur since the monomer is deposited onto the metallic substrate directly in this case.
Funder Acknowledgement(s): National Science FoundationAir Force Office of Scientific ResearchDepartment of DefenseSandia National LaboratoryThis work was supported by NSF grants 1830886, 1856515, and 2112595, AFOSR grant FA9550-18-1-0417, DoD grant W911NF1810472, and NNSA award DE-NA0004007. The work is partly supported by the Laboratory Directed Research and Development program at Sandia National Laboratories, a multisession laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under Contract No. DE-NA-0003525
Faculty Advisor: Dr. Mikhail Noginov, mnoginov@nsu.edu
Role: Data Analysis: Absorbance coefficients calculations, plot preparations, line fitting for respective data, (personal literature review)