Abstract
The comparison between two kinds of single-layer reduced graphene oxide (rGO) sheets, obtained by reduction of graphene oxide (GO) with the electrochemical method and hydrazine vapor reduction, referred to as E-rGO and C-rGO, respectively, is systematically studied. Although there is no morphology difference between the E-rGO and C-rGO films adsorbed on solid substrates observed by AFM, the reduction process to obtain the E-rGO and C-rGO films is quite different. In the hydrazine vapor reduction, the nitrogen element is incorporated into the obtained C-rGO film, while no additional element is introduced to the E-rGO film during the electrochemical reduction. Moreover, Raman spectra show that the electrochemical method is more effective than the hydrazine vapor reduction method to reduce the GO films. In addition, E-rGO shows better electrocatalysis towards dopamine than does C-rGO. This study is helpful for researchers to understand these two different reduction methods and choose a suitable one to reduce GO based on their experimental requirements.
Highlights
Graphene, a kind of two-dimensional carbon materials, has attracted increasing attention [1,2,3]
After a systematic study, we found that the morphologies of single-layer E-reduced graphene oxide (rGO) and chemically reduced GO (C-rGO) adsorbed on solid substrates are quite similar, their components and especially their electrocatalysis towards dopamine (DA) are quite different
In order to study the graphene oxide (GO) and rGO films by Atomic force microscopy (AFM) and Raman spectroscopy, single-layer GO was assembled on APTES-modified Indium tin oxide (ITO) and SiO2 substrates, referred to as ITO-APTES-GO and SiO2-APTES-GO, respectively, which was reduced by electrochemical method and hydrazine vapor reduction
Summary
A kind of two-dimensional carbon materials, has attracted increasing attention [1,2,3]. The highly negative potential used in the electrochemical method can overcome the energy barriers to efficiently reduce the oxygen-containing functional groups in GO [47] Both the electrochemical reduction [20,46,47,48,49] and hydrazine vapor reduction [31,40,41,42,43,50] can reduce GO to get electrochemically reduced GO (E-rGO) and chemically reduced GO (C-rGO), referred to as E-rGO and C-rGO, respectively. The adsorptions of single-layer GO on APTES-modified glassy carbon electrode (GCE) [46], ITO [46], and SiO2 substrates [31,50], referred to as GCE-APTES-GO, ITO-APTES-GO, and SiO2-APTESGO, respectively, were prepared based on our previous reports. Atomic force microscopy (AFM) images were obtained by using Dimension 3100 (Veeco, CA, USA) in tapping mode using Si tip (Veeco, resonant frequency, 320 kHz, Spring constant, 42 N m-1) under ambient conditions with a scanning rate of 1 Hz and scanning line of 512
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