“…This behavior is associated with a nonthermal stable material that confirms that functional groups make the GrO material less hydrophilic. [27] The thermogravimetric results are in concordance with previous literature, [25][26][27][28] where GrO is a thermally unstable material, as it slowly decomposes between 60 and 80 °C, [29] and later 200-240 °C, the decomposition of oxygenated functional groups occurs, releasing CO, CO 2 , and water vapor. The thermal behavior of the GrODAMN material (Figure 2b) showed the same temperature domain of the weight loss zones as the GrO material.…”
“…This behavior is associated with a nonthermal stable material that confirms that functional groups make the GrO material less hydrophilic. [27] The thermogravimetric results are in concordance with previous literature, [25][26][27][28] where GrO is a thermally unstable material, as it slowly decomposes between 60 and 80 °C, [29] and later 200-240 °C, the decomposition of oxygenated functional groups occurs, releasing CO, CO 2 , and water vapor. The thermal behavior of the GrODAMN material (Figure 2b) showed the same temperature domain of the weight loss zones as the GrO material.…”
“…Meanwhile, it is clearly shown that the micro nano-hardness and elastic modulus of PMG films are the biggest among the four films. It could be the special covalent bonding formed by the synergistic effect of MoS 2 and Gr with PI polymer chain which improves the mechanical properties of PMG composite lubricating film [28-30]. Figure 10 Load–depth curves of pure PI film and PM/PG/PMG composite lubricating films.…”
Polyimide-based solid lubricating films were prepared by simple and efficient spin coating proceeding. Several composite lubricating films were obtained by changing the composition and contents of inorganic solid lubricants in organic binder. The structure, physical phase, and performance of the synthesised lubricating films were characterised by using X-ray diffraction, scanning electron microscope, fourier transform infrared spectrometry, thermo gravimetric analyzer, and nano-indentation methods. And the friction coefficients of these composite lubricating films were measured by pin-on-disk structural tribometer. The results showed that all kinds of lubricating films had good adhesion strength. Compared with the pure polyimide film, the composite lubricating films exhibited better thermal and mechanical properties. These composite lubricating films, with MoS 2 and graphite as solid lubricants, could effectively reduce the friction coefficient of polyimide film. Moreover, the friction coefficient of the composite lubricating film filled with the above two kinds of lubricant decreased to the minimum 0.141.
“…The interlayer distance is larger than the reported value of 0.335 nm for pristine graphite corresponding to a diffraction peak at 27°. This increase in the d ‐spacing may be attributed to the possible presence of oxygen containing functional groups on the GO edge [25]. Using the Scherrer equation, the mean crystalline diameter and the average number of layers in a crystallite were found to be 7.24 nm and ∼8 respectively.…”
The presence of voltage controlled negative differential resistance was observed in conduction characteristics recorded at room temperature for 300 nm thick spin-coated films of graphene oxide (GO) sandwiched between indium tin oxide (ITO) substrates and top electrodes of sputtered gold (Au) film. The GO crystallites were found from the X-ray diffraction studies to have an average size in the order of 7.24 nm and to be preferentially oriented along (001) plane. Raman spectroscopy suggested that the material consisted of multilayer stacks with the defects being located at the edges with an average distance of 1.04 nm apart. UV visible spectroscopy studies suggested that the band gap of the material was 4.3 eV, corresponding to direct transitions. The two-terminal ITO/GO/Au devices exhibited memristor characteristics with scan-rate dependent hysteresis, threshold voltage and On/Off ratios. A value of >10 4 was obtained for On/Off ratio at a scan rate of 400 mVs −1 and 4.2 V.
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