TY - JOUR
T1 - Role of trapped water in the microwave assisted reduction and exfoliation of graphene oxide
AU - Iniestra-Galindo, M. G.
AU - Pérez-González, J.
AU - Balmori-Ramírez, H. M.
AU - Flores-Esperilla, A. L.
N1 - Publisher Copyright:
© 2018, Universidad Autonoma Metropolitana Iztapalapa. All rights reserved.
PY - 2018/5/1
Y1 - 2018/5/1
N2 - Chemical methods to produce graphene involve strong oxidation of graphite and its subsequent exfoliation and reduction to obtain reduced graphene oxide (rGO). Recently, a novel method to produce rGO has been proposed, which consists on the exposure of GO to microwave irradiation. However, the mechanisms of reduction and exfoliation of GO by using this technique are not clear yet. In this work, the reduction and exfoliation of GO by using microwaves was analyzed with a focus on the water content that allows a successful process. For this, three samples of commercial GO were exposed to different atmospheric conditions and further irradiated in a commercial microwave oven. The samples were characterized before and after irradiation by using different microscopic and spectroscopic techniques. It was found that the water trapped in the samples is the key parameter for a successful reduction and exfoliation of GO by using microwaves. The reduction and exfoliation of GO were macroscopically visible as a significant volume change and color, as well as an increase in conductivity and further corroborated by spectroscopic techniques. For the conditions utilized in this work, the amount of water in GO samples required for a successful process was estimated as ~5 wt% of the sample.
AB - Chemical methods to produce graphene involve strong oxidation of graphite and its subsequent exfoliation and reduction to obtain reduced graphene oxide (rGO). Recently, a novel method to produce rGO has been proposed, which consists on the exposure of GO to microwave irradiation. However, the mechanisms of reduction and exfoliation of GO by using this technique are not clear yet. In this work, the reduction and exfoliation of GO by using microwaves was analyzed with a focus on the water content that allows a successful process. For this, three samples of commercial GO were exposed to different atmospheric conditions and further irradiated in a commercial microwave oven. The samples were characterized before and after irradiation by using different microscopic and spectroscopic techniques. It was found that the water trapped in the samples is the key parameter for a successful reduction and exfoliation of GO by using microwaves. The reduction and exfoliation of GO were macroscopically visible as a significant volume change and color, as well as an increase in conductivity and further corroborated by spectroscopic techniques. For the conditions utilized in this work, the amount of water in GO samples required for a successful process was estimated as ~5 wt% of the sample.
KW - Exfoliation
KW - Graphene oxide
KW - Microwave irradiation
KW - Reduction
UR - http://www.scopus.com/inward/record.url?scp=85053085013&partnerID=8YFLogxK
U2 - 10.24275/uam/izt/dcbi/revmexingquim/2018v17n2/Iniestra
DO - 10.24275/uam/izt/dcbi/revmexingquim/2018v17n2/Iniestra
M3 - Artículo
SN - 1665-2738
VL - 17
SP - 445
EP - 453
JO - Revista Mexicana de Ingeniera Quimica
JF - Revista Mexicana de Ingeniera Quimica
IS - 2
ER -