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Spectrochim Acta A Mol Biomol Spectrosc. 2014 Jan 24;118:1020-4. doi: 10.1016/j.saa.2013.09.087. Epub 2013 Oct 9.

Spectra investigation on surface characteristics of graphene oxide nanosheets treated with tartaric, malic and oxalic acids.

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1
College of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, PR China; Institute of Health Research, Anhui University, Hefei 230601, PR China.

Abstract

The surface characteristics of graphene oxide nanosheets (GO) treated respectively with tartaric acid, malic acid and oxalic acid, have been investigated by mainly using optical spectroscopic methods including Fourier transform infrared spectroscopy (FT-IR), Ultraviolet-visible (UV-Vis) absorption and Raman spectroscopy. Additionally, the electrochemical property of the products has also been studied. The data revealed that oxygen-containing groups such as OH, COOH and CO on the GO surface have been almost removed and thus reduced graphene oxide nanosheets (RGN) were obtained. Interestingly, the number of sp(2) domains of RGN increases as treated by tartaric acid<malic acid<oxalic acid whereas the steric hindrance (SH) decreases and the ionization constant (IC) differs among these three acids. Furthermore, the specific capacitances (Cs) of GO have been greatly promoted from 2.4 F g(-1) to 100.8, 112.4, and 147 F g(-1) after treated with tartaric, malic and oxalic acids, respectively. This finding agrees well with the spectra result of the tendency of surface conjugated degree alteration. We claim that the difference in both SH and IC among these acids is the main reason for the diverse surface characteristics as well as the improved Cs of the RGN.

KEYWORDS:

Hydroxyl acid; Raman; Reduced graphene oxide nanosheets; UV–Vis

PMID:
24161864
DOI:
10.1016/j.saa.2013.09.087
[Indexed for MEDLINE]
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