1 research outputs found
Effect of Pretreatment Conditions on the Precise Nanoporosity of Graphene Oxide
Nanoscale pores in graphene oxide (GO) control various
important
functions. The nanoporosity of GO is sensitive to low-temperature
heating. Therefore, it is important to carefully process GO and GO-based
materials to achieve superior functions. Optimum pretreatment conditions,
such as the pre-evacuation temperature and time, are important during
gas adsorption in GO to obtain accurate pore structure information.
This study demonstrated that the pre-evacuation temperature and time
for gas adsorption in GO must be approximately 333–353 K and
4 h, respectively, to avoid the irreversible alteration of nanoporosity.
In situ temperature-dependent Fourier-transform infrared spectra and
thermogravimetric analysis–mass spectrometry suggested significant
structural changes in GO above the pre-evacuation temperature (353
K) through the desorption of “physically adsorbed water”
and decomposition of unstable surface functional groups. The nanoporosity
of GO significantly changed above the aforementioned pre-evacuation
temperature and time. Thus, standard pretreatment is indispensable
for understanding the intrinsic interface properties of GO