The innovation engine for new materials

Anthony Quintana

Anthony Quintana

Major: 

Biochemistry

Mentor(s): 

Alex Heilman

Faculty Sponsor(s): 

Professor Michael Gordon

Faculty Sponsor's Department(s): 

Chemical Engineering

Project Title: 

An Investigation of the Flourescence Quenching Properties and Raman Spectra of Graphene

Project Description: 

The development of novel methods of microscopy at the atomic scale will revolutionize the imaging and control of materials in the near future. Although the concept of Raman light scattering in microscopy is not new, a reliable Tip Enhanced Raman Spectroscopy [TERS] system has yet to be perfected. One reason for this is that Raman signals are inherently weak and greatly overshadowed by fluorescence. This summer we focused on growing high quality, monatomic layers of graphene. Graphene’s fluorescence quenching properties have the potential to advance the development of TERS. Samples were prepared on Cu foils via a chemical vapor deposition process and transferred to a silicon substrate for study. We have confirmed the presence of quality few layer graphene (<10 layers) using Atomic Force Microscopy and Raman spectroscopy.  Raman spectroscopy has also been used to analyze the quality of the graphene samples through direct comparison with graphite.  This data is being used to develop a reliable and reproducible procedure for growing high quality single layer graphene.  Our next goal is to qualitatively analyze the fluorescence quenching properties of graphene by examining the Raman spectra of several aromatic compounds when adsorbed to it.  Anthracene, pentacene, and pyrene were chosen for initial study because these compounds not only fluoresce in the UV-Vis range, but are also Raman active. Gaining better understanding of graphene’s fluorescence quenching behavior will allow for its future use as a substrate for chemically patterned surfaces to be analyzed via TERS.