Abstract
Using in-situ Kelvin probe force microscopy (KPFM) to measure surface potential, we investigated the time-dependent work function evolution of solution-processed graphene oxide (GO) under ultraviolet (UV) irradiation. We found that the work function of GO exposed in UV shows a notable decrease with increasing irradiation time, which is proposed to be attributed to the gradual disappearance of oxygen-containing functional groups in GO during the UV-induced reduction reaction process. Fourier transform infrared spectrum and Raman spectrum were used to confirm the reduction of GO under UV irradiation. Our study would give an insight into understanding the transformation of GO’s electronic structures during the reduction process.
Highlights
Since its discovery in 2004,1 graphene has attracted much interest for its unique properties and wide-ranging technological applications.[2,3,4,5,6,7,8,9,10,11] Up to now, the solution-based method is considered to be one of the most effective and economical route to prepare graphene
Using in-situ Kelvin probe force microscopy (KPFM) to measure surface potential, we investigated the time-dependent work function evolution of solution-processed graphene oxide (GO) under ultraviolet (UV) irradiation
We found that the work function of GO exposed in UV shows a notable decrease with increasing irradiation time, which is proposed to be attributed to the gradual disappearance of oxygen-containing functional groups in GO during the UV-induced reduction reaction process
Summary
Since its discovery in 2004,1 graphene has attracted much interest for its unique properties and wide-ranging technological applications.[2,3,4,5,6,7,8,9,10,11] Up to now, the solution-based method is considered to be one of the most effective and economical route to prepare graphene. Benefitted from the mass-production and low-cost, the solution-processed graphene oxide (GO) after reduction is widely used to fabricate solar cell, photocatalyst, etc.[12,13,14,15] As well known, work function (WF) is a critical parameter that influences the energy-convert efficiency and catalysis performance, and the WF of reduced-GO would be highly susceptible to the residual functional groups.[16,17,18] It is of importance to gain sight into the WF modulation of GO during the reduction process. Compared with the initial prinstine GO, WF of GO after UV illumination has a notable decrease with increasing irradiation time, which is proposed to be resulted from the fading of oxidation functional groups, confirmed by the Fourier transform infrared spectra and Raman spectra of GO with and without UV irradiation
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