Lateral size effect of graphene oxide on its surface-enhanced raman scattering property

Yoo Bin Kwon, Se Youn Cho, Hongje Jang, Jae Ho Kim, Young Kwan Kim

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The lateral size effect of graphene oxide (GO) on surfaced-enhanced Raman scattering (SERS) property is systematically investigated by using size-fractionalized GO. For the size fractionalization without changes of chemical structure, large-sized GO (LGO) and small-sized GO (SGO) are separated from the as-synthesized GO (AGO) by centrifugation and membrane filtration, respectively. The size-fractionalized GO sheets are immobilized on a solid substrate for the parallel comparison of their SERS property. As a result, we find that LGO shows considerably higher SERS property than SGO for typical Raman probes such as rhodamine 6G and crystal violet. Furthermore, the lateral size effect of GO derivatives is consistently observed when they are hybridized with plasmonic silver nanoparticles. These results indicate that LGO is superior to AGO and SGO as a SERS platform, and it is also quantitatively confirmed by calculating their enhancement factor.

Original languageEnglish
Pages (from-to)14205-14213
Number of pages9
JournalLangmuir
Volume37
Issue number48
DOIs
StatePublished - 7 Dec 2021

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