Consequence of oxidation method on graphene oxide produced with different size graphite precursors

Facile synthetic route to exfoliate high quality and super-large lateral size graphene-based sheets and their applications in SERS and CO2gas sensing

“…In the second zone, 32 wt% is lost, which is attributed to the escape of CO 2 and CO gases and subsequently, 5 wt% is lost in the third zone due to the release of CO 2 and CO. These results are consistent with the reported works 17,28,38 which describe the three zones for weight reduction owing to loss of water, loosely bound oxygen, and relatively inert oxygen. Tang et al 17 explained that the weight loss in the second stage was originated from the decomposition of the oxygen-containing group, resulting in a mixture of CO 2 and CO where CO 2 dominates.…”

Thermal decomposition of hydrated graphite oxide: A computational study

“…At still higher temperatures, most interesting processes involve changes in the functional groups within rGO. Oxygen groups decorating the faces are likely to migrate towards the reactive edges of disintegrating GO, where they survive as carboxyl and carbonyl groups up to 500 − 700°C [55,58]. This finding is consistent with results of thermogravimetric analyses of GO samples, which were prepared by various methods [58] and displayed no weight loss above 600°C [57,59].…”

“…Even though many experimental results related to the thermal decomposition of GO are controversial, there is general consensus about the major trends. Differences between published studies are likely related to inherent variations in the microstructure of GO samples produced by different techniques and subjected to different heat treatment protocols [58].…”

“…Oxygen groups decorating the faces are likely to migrate towards the reactive edges of disintegrating GO, where they survive as carboxyl and carbonyl groups up to 500 − 700°C [55,58]. This finding is consistent with results of thermogravimetric analyses of GO samples, which were prepared by various methods [58] and displayed no weight loss above 600°C [57,59]. Analysis of electron energy-loss spectroscopy (EELS) and X-ray photoelectron spectroscopy (XPS) data of GO heated to different temperatures has revealed that epoxide groups disappear above 400°C, whereas hydroxyl groups remain present up to 1, 000°C [60].…”

Characterization of Graphite Oxide and Reduced Graphene Oxide Obtained from Different Graphite Precursors and Oxidized by Different Methods Using Raman Spectroscopy Statistical Analysis

“…The degree of comminution of the graphite is an additional factor that affects the effectiveness of the oxidation process. Deemer et al [ 18 ] studied the influence of the oxidation method (using the Hummers [ 6 ] and Marcano–Tour [ 9 ] methods) using various sizes (smaller than 100 µm and bigger than 420 µm) of graphite flake. In the Hummers method, the graphene materials’ parameters depend on the grain size, which is correlated with the oxidation degree of GO.…”