Raman spectroscopy of pristine and PEI-doped graphene

Authors

Laureen Ida Monzon Ballesteros ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
Jamela Pangasinan ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
Charlene De Luna ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
Rogie Madula ⋅ PH
Mary Baby Aizeil Racho ⋅ PH Materials Science and Engineering Program, University of the Philippines Diliman
Armando Somintac ⋅ PH National Institute of Physics, University of the Philippines Diliman
Arnel Salvador ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

Graphene is a promising sensing material due to its high specific area, high electrical conductivity, and low electrical noise. In this work, the n-type doping of monolayer graphene on SiO₂/Si by polyethylenimine (PEI) coating and exposure to methanol vapor was investigated using Raman spectroscopy. Pristine graphene was single- and double-coated with PEI via spin-coating. Doping effectiveness was evaluated based on the changes in the Raman features, such as peak position, FWHM, and intensity ratios, of the signature graphene band peaks. In-situ Raman measurements were obtained before, during, and after exposure to methanol in order to investigate the interaction of the gas adsorbates on the graphene surface. The doping method using volatiles can be employed as a gas sensing mechanism of pristine graphene.

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Issue

2018: Proceedings of the 36th Samahang Pisika ng Pilipinas Physics Conference

Article ID

SPP-2018-PA-52

Section

Poster Session A (Materials Science, Instrumentation, and Photonics)

Published

2018-06-02

How to Cite

[1]

LIM Ballesteros, J Pangasinan, C De Luna, R Madula, MBA Racho, A Somintac, and A Salvador, Raman spectroscopy of pristine and PEI-doped graphene, Proceedings of the Samahang Pisika ng Pilipinas 36, SPP-2018-PA-52 (2018). URL: https://proceedings.spp-online.org/article/view/SPP-2018-PA-52.