研究目的
The main objective of this article is to develop new polymeric nanocomposites (PC/PEO) by doping graphene nanoparticles. The X-ray di?raction, FT-IR, UV–Vis spectroscopy, and AC electrical conductivity has been carried out to investigate and analysis the obtained nanocomposite ?lms.
研究成果
Films of PC/PEO blend doped graphene oxide are prepared and investigated. The infrared spectra display that all samples are nearly similar and no signi?cant change in the band positions compared of pure PC/PEO, suggesting that addition of graphene did not give any change in the structure of the blend. The area under the X-ray peak of the blend is decreased with the increase of graphene content due to an interaction between PC/PEO and GO is occurring. The SEM images display that the graphene is a well dispersed inside the polymeric ma- trices. The Optical absorption curves indicate that the main absorption band at 242 nm assigned to electronic transition. The value of Eg is obtained using indirect transition and its decrease with increasing graphene content. The behavior of ε′ and ε″ decreased with the increase of frequencies is observed. At high frequencies, the linearity of ε′ is tending to approach steady state. After adding graphene, the frequency is increased due to the dipole moment will no longer to rotate and the oscillation being to be lag those of the applied ?eld. The decrease of ε″ with increases of both the frequency and the temperature attributed to the origin of ε″ is the conduction losses. The decrease of dissipation factor (tan δ) is ascribed to the internal polarization mechanism related to applied frequencies. The maximum value of the peak at M″ relation explained as being the result of the distribution of relaxation time and Debye type model.
研究不足
The technical and application constraints of the experiments, as well as potential areas for optimization, are not explicitly mentioned in the paper.
1：Experimental Design and Method Selection:
The casting technique is used to prepare the nanocomposites. The blend solution is stirred to obtain a homogeneous solution. Graphene powder is dissolved and suspended in DMF by a stirrer and then a sonicator for 45 min. Various concentrations of graphene nanoparticles (GNP) (0.03, 0.06 and 0.09 wt%) is added in the composite mixture as a dopant and stirred with the sonicator further for another 20 min to con?rm the distribution of graphene throughout the PC/PEO. The solution is then cast onto a glass plate to get a nanocomposites ?lm with uniform thickness. The ?lms of PC/PEO-GNP are dried at a temperature of 60 °C for 15 h.
2：03, 06 and 09 wt%) is added in the composite mixture as a dopant and stirred with the sonicator further for another 20 min to con?rm the distribution of graphene throughout the PC/PEO. The solution is then cast onto a glass plate to get a nanocomposites ?lm with uniform thickness. The ?lms of PC/PEO-GNP are dried at a temperature of 60 °C for 15 h.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The materials used are a blend of polycarbonate (PC) with polyethylene oxide (PEO) from ACROS company (New Jersey, USA) with molecular weight (M.W.) ≈ 40,000 g/mol and the graphene nanopowder is distinctive nanoparticles. The particles of graphene have a thickness ≈6–8 nm.
3：List of Experimental Equipment and Materials:
PANalytical X'Pert PROXRD analyzer with ?ltered Cu Kα radiation (λ = 1.54056 ?) working at 30 kV acceleration and 10 mA currents of the X-ray tube. The FT-IR spectra are recorded on Nicolet iS10, USA spectrometer. Ultraviolet–visible (UV–vis) absorption spectra of polymer ?lms are recorded using (V-570 UV/VIS/NIR, JASCO) in wavelength range 195–900 nm. The AC electrical studies are done in a frequency range from 10?1 to 107 Hz, using Novocontrol Technologies Broadband Dielectric Spectroscopy.
4：54056 ?) working at 30 kV acceleration and 10 mA currents of the X-ray tube. The FT-IR spectra are recorded on Nicolet iS10, USA spectrometer. Ultraviolet–visible (UV–vis) absorption spectra of polymer ?lms are recorded using (V-570 UV/VIS/NIR, JASCO) in wavelength range 195–900 nm. The AC electrical studies are done in a frequency range from 10?1 to 107 Hz, using Novocontrol Technologies Broadband Dielectric Spectroscopy.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The X-ray pattern is recorded on a PANalytical X'Pert PROXRD analyzer. The FT-IR spectra are recorded on Nicolet iS10, USA spectrometer. Ultraviolet–visible (UV–vis) absorption spectra of polymer ?lms are recorded using (V-570 UV/VIS/NIR, JASCO). The AC electrical studies are done in a frequency range from 10?1 to 107 Hz, using Novocontrol Technologies Broadband Dielectric Spectroscopy.
5：Data Analysis Methods:
The absorption coe?cient (α) which related to the photon energy (hν) using the equation αhν = A(hν ? Eg)n. The values of the optical band gap (Eg) are obtained by extrapolating the straight parts from the plot with υh axis.
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