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November 13-15, 2017 | Las Vegas, USA
14
th
International Conference and Exhibition on
Materials Science and Engineering
RRJOMS | Volume 5 | Issue 7 | November, 2017
Synthesis, characterization and reduction of graphene oxide for its application in photovoltaic solar cells
D. K .Becerra Paniagua
1
, M. Sotelo Lerma
2
and
H. Zhao Hu
1
1
Universidad Nacional Autónoma de México, México
2
Universidad de Sonora, México
I
n this paper, the graphene oxide (GO) was prepared by variations of the Tour using natural graphite powder as starting material.
The GO was synthesis procedure is described as follows: for oxidation stage, a mixture of concentred sulfuric acid and boric acid
(H
2
SO
4
/H
3
BO
3
, 10-30 ml) was added to a mixture of graphite powder (0.1-0.3 g) and potassium permanganate (KMnO
4
, 0.6-0.8 g),
producing a slight exotherm. The reaction was stirred for 30-90 min to 20-30 °C and then was heated to 40-55°C. For exfoliation
stage, deionized (DI) water (20-30 ml) was added to the suspension and then was heated to 80-90°C and stirred for 15-45 min. The
reaction was then finished by adding hydrogen peroxide (H
2
O
2
50%, 10-30 ml). The resulting product has a brown/yellowish color
and was separated by centrifugation from the solution. The resulting GO was washed 3-5 times with diluted HCl (20%, 50-100 ml)
and DI water (150-200 ml); for each wash, the mixture was centrifuged (6000 rpm for 10-20 min) and the supernatant decanted
away. The solid obtained was dried overnight to 50-60°C, obtaining 30-40 mg. For reduction stage, GO was suspended in DI water
and sonicated for 1-2 h, yielding an aqueous GO dispersion (10-20 mg/ 100 ml). This dispersion was treated with ascorbic acid (1-2
mM) and stirred for 1-2 h to 70-80°C under reflux. The resulting product has a dark color and was separated by centrifugation from
the solution. The solid obtained was dried overnight to 50-60°C, obtaining 5-10 mg of product. To study the chemical composition,
presence of functional groups, exfoliation level, number of layers, oxidation degree, and the samples were characterized by different
techniques such as UV-Visible, FT-IR, SEM, TEM and XPS. The designed synthesis is to looking for an alternative approach for large
scale production of GO.
dkbp@ier.unam.mxRes. Rev. J Mat. Sci. 2017, 5:7
DOI: 10.4172/2321-6212-C1-012