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Nanocomposites Synthesis Essay

Abstract

Due to the growing interest in nanocomposites, a molecular characterization of these materials is essential for the understanding of their properties and for the development of new materials. Spectroscopic techniques that bring information at a molecular level are unavoidable when characterizing polymers, fillers and composites. Selected examples of the application of fluorescence, solid-state nuclear magnetic resonance (NMR), infrared and Raman spectroscopies, illustrate the potential of these techniques for the analysis of the filler surface, the evaluation of the state of filler dispersion in the host matrix, the extent of interaction between the polymer and the filler particles or the dynamics of polymer chains at the polymer–filler interface. View Full-Text

Keywords: nanocomposites; spectroscopy; polymer-filler interface; fluorescence; NMR; infrared; Ramannanocomposites; spectroscopy; polymer-filler interface; fluorescence; NMR; infrared; Raman

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MDPI and ACS Style

Bokobza, L. Spectroscopic Techniques for the Characterization of Polymer Nanocomposites: A Review. Polymers2018, 10, 7.

AMA Style

Bokobza L. Spectroscopic Techniques for the Characterization of Polymer Nanocomposites: A Review. Polymers. 2018; 10(1):7.

Chicago/Turabian Style

Bokobza, Liliane. 2018. "Spectroscopic Techniques for the Characterization of Polymer Nanocomposites: A Review." Polymers 10, no. 1: 7.

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Abstract

In this paper, the sample preparation of polymer nanocomposites based on methyl cellulose (MC) with small optical bandgaps has been discussed. Copper monosulfide (CuS) nanoparticles have been synthesized from the sodium sulphide (Na2S) and copper chloride (CuCl2) salts. Distinguishable localized surface resonance plasmon (LSRP) absorption peaks for CuS nanoparticles within the 680–1090 nm scanned wavelength range were observed for the samples. An absorption edge (Ed) was found to be widely shifted to a lower photon energy region. A linear relationship between the refractive index of the samples and the CuS fraction was utilized to describe the distribution of the particle. The optical bandgap of MC was reduced from 6.2 to 2.3 eV upon the incorporation of 0.08 M of CuS nanoparticles. The optical dielectric loss, as an alternative method, was used successfully to estimate the optical bandgap. Moreover, the electronic transition type was identified by using Tauc’s extrapolation method. The plots of the optical dielectric constant and energy bandgap as a function of the CuS concentration were utilized to examine the validity of the Penn model. For the nanocomposite samples, the Urbach energy was found to be increased, which can be evidence for a large possible number of bands-to-tail and tail-to-tail transitions. However, from the X-ray diffraction (XRD) analysis, it was also found that the synthesized CuS nanoparticles disrupted the crystallinity phase of the MC polymer. Finally, fourier transform infrared (FTIR) spectroscopy for the samples was also performed. Significant decreases of transmittance intensity as well as band shifting in the FTIR spectra were observed for the doped samples. View Full-Text

Keywords: methyl cellulose (MC) nanocomposite; SPR band; bandgap study; optical dielectric function; XRD; FTIR studymethyl cellulose (MC) nanocomposite; SPR band; bandgap study; optical dielectric function; XRD; FTIR study

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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