Details

Autor(en) / Beteiligte

• Al-Hamry, A.
• Kang, H.
• Sowade, E.
• Dzhagan, V.
• Rodriguez, R.D.
• Müller, C.
• Zahn, D.R.T.
• Baumann, R.R.
• Kanoun, O.

Titel

Tuning the reduction and conductivity of solution-processed graphene oxide by intense pulsed light

Ist Teil von

• Carbon (New York), 2016-06, Vol.102, p.236-244

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• We report about the reduction of spin-coated graphene oxide (GO) layers by intense pulsed light (IPL) treatment. The reduction is achieved in a few seconds resulting in semi-transparent graphene thin films with electrical conductivities up to 6.6 S/cm. In comparison to GO reduction by conventional thermal annealing in an oven, the IPL method is much faster, enabling applications in transparent and flexible polymer substrates. Moreover, this process is roll-to-roll compatible and chemicals-free. The parameters of IPL were optimized in order to tune the conductivity of reduced GO (rGO) films as a function of exposure energy, pulse duration, and number of pulses. The effect of IPL parameters on the morphology and the electrical properties of rGO films were investigated by vis-NIR, X-ray photoelectron, and Raman spectroscopies, as well as scanning electron microscopy, atomic force microscopy, and sheet resistance measurements. The correlation between Raman spectroscopy analysis and sheet resistance shows that the G band width can be used to evaluate the conductivity of the rGO. The IPL, in a time frame of seconds, results in higher conductivity than oven annealing of 30 min at 400 °C, which is also evidenced in the Raman spectra showing the same structural changes as X-ray photoelectron spectroscopy.