6533b7d9fe1ef96bd126b918
RESEARCH PRODUCT
Chemical composition of two-photon oxidized graphene
Pasi MyllyperkiöJukka AumanenMika PetterssonHung Chieh TsaiAndreas JohanssonMin Chiang ChuangChia Hao ChenYi Zhe HungJuha KoivistoinenWei Yen Woonsubject
Materials sciencechemical compositionsOxidechemistry.chemical_element02 engineering and technology010402 general chemistryPhotochemistry01 natural scienceslaw.inventionMicrometresymbols.namesakechemistry.chemical_compoundX-ray photoelectron spectroscopylawOrganic chemistryGeneral Materials ScienceIrradiationChemical compositionta116ta114GrapheneGeneral Chemistry021001 nanoscience & nanotechnology0104 chemical scienceschemistrysymbols0210 nano-technologyRaman spectroscopyCarbondescription
Chemical composition of two-photon oxidized single-layer graphene is studied by micrometer X-ray photoelectron spectroscopy (XPS). Oxidized areas with a size of 2 × 2 μm2 are patterned on graphene by tightly focused femtosecond pulsed irradiation under air atmosphere. The degree of oxidation is controlled by varying the irradiation time. The samples are characterized by four wave mixing (FWM) imaging and Raman spectroscopy/imaging. Micrometer-XPS is used to study local chemical composition of oxidized areas. XPS imaging shows good contrast between oxidized and non-oxidized areas. Gradual oxidation is observed from growth of signals attributed mainly to hydroxyl (Csingle bondOH) and epoxide (Csingle bondOsingle bondC) groups with a minor contribution of carboxylic groups. The highly oxidized areas are characterized by ∼40% of carbon atoms involved in hydroxyl and ∼25% in epoxide groups. The Raman peaks of oxidized graphene are relatively narrow indicating less disordered material than what is typically observed for graphene oxide. peerReviewed
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-05-01 | Carbon |