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Thermal and Optical Properties of CdS Nanoparticles in Thermotropic Liquid Crystal Monomers

Two new mesogenic monomers, namely 3,3’-dimethoxy-4,4’-di(hydroxyhexoxy)-N-benzylidene-o-Tolidine (Ia) and 4,4’-di(6-hydroxyhexoxy)-N-benzylidene-o-Tolidine (IIa), were reacted with cadmium sulfide (CdS) via an in situ chemical precipitation method in ethanol to produce CdS nanocomposites. A series...

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Autores principales: Lee, Hooi Ling, Mohammed, Issam Ahmed, Belmahi, Mohammed, Assouar, Mohamed Badreddine, Rinnert, Hervé, Alnot, Marc
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Molecular Diversity Preservation International 2010
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Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5445895/
http://dx.doi.org/10.3390/ma3032069
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author Lee, Hooi Ling
Mohammed, Issam Ahmed
Belmahi, Mohammed
Assouar, Mohamed Badreddine
Rinnert, Hervé
Alnot, Marc
author_facet Lee, Hooi Ling
Mohammed, Issam Ahmed
Belmahi, Mohammed
Assouar, Mohamed Badreddine
Rinnert, Hervé
Alnot, Marc
author_sort Lee, Hooi Ling
collection PubMed
description Two new mesogenic monomers, namely 3,3’-dimethoxy-4,4’-di(hydroxyhexoxy)-N-benzylidene-o-Tolidine (Ia) and 4,4’-di(6-hydroxyhexoxy)-N-benzylidene-o-Tolidine (IIa), were reacted with cadmium sulfide (CdS) via an in situ chemical precipitation method in ethanol to produce CdS nanocomposites. A series of different mass compositions of CdS with Ia and IIa ranging from 0.1:1.0 to 1.0:1.0 (w/w) were prepared and characterized using X-ray Diffraction (XRD), Raman spectroscopy, Fourier Transform Infrared Spectroscopy (FT-IR), Transmission Electron Microscopy (TEM), Polarizing Optical Microscopy (POM) and Differential Scanning Calorimetry (DSC), X-ray Photoelectron Spectroscopy (XPS) and Photoluminescence Spectroscopy (PL). XRD showed that the broad peaks are ascribed to the formation of cubic CdS nanoparticles in both Ia and IIa. The average particle size for both nanocomposites was less than 5 nm with a narrower size distribution when compared with pure CdS nanoparticles. The analyses from POM and DSC demonstrated that mass composition from 0.1:1.0 up to 0.5:1.0 of CdS:Ia nanocomposites showed their enantiotropic nematic phase. On the other hand, polarizing optical microscopy (POM) for IIa nanocomposites showed that the liquid crystal property vanished completely when the mass composition was at 0.2:1.0. PL emissions for CdS: Ia or IIa nanocomposites indicated deep trap defects occurred in these both samples. The PL results revealed that addition of CdS to Ia monomers suppressed the photoluminescence intensity of Ia. However, the introduction of CdS to IIa monomers increased the photoluminescence and was at a maximum when the mass composition was 0.3:1.0, then decreased in intensity as more CdS was added. The XPS results also showed that the stoichiometric ratios of S/Cd were close to 1.0:1.0 for both types of nanocomposites for a mass composition of 1.0:1.0 (CdS:matrix).
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spelling pubmed-54458952017-07-28 Thermal and Optical Properties of CdS Nanoparticles in Thermotropic Liquid Crystal Monomers Lee, Hooi Ling Mohammed, Issam Ahmed Belmahi, Mohammed Assouar, Mohamed Badreddine Rinnert, Hervé Alnot, Marc Materials (Basel) Article Two new mesogenic monomers, namely 3,3’-dimethoxy-4,4’-di(hydroxyhexoxy)-N-benzylidene-o-Tolidine (Ia) and 4,4’-di(6-hydroxyhexoxy)-N-benzylidene-o-Tolidine (IIa), were reacted with cadmium sulfide (CdS) via an in situ chemical precipitation method in ethanol to produce CdS nanocomposites. A series of different mass compositions of CdS with Ia and IIa ranging from 0.1:1.0 to 1.0:1.0 (w/w) were prepared and characterized using X-ray Diffraction (XRD), Raman spectroscopy, Fourier Transform Infrared Spectroscopy (FT-IR), Transmission Electron Microscopy (TEM), Polarizing Optical Microscopy (POM) and Differential Scanning Calorimetry (DSC), X-ray Photoelectron Spectroscopy (XPS) and Photoluminescence Spectroscopy (PL). XRD showed that the broad peaks are ascribed to the formation of cubic CdS nanoparticles in both Ia and IIa. The average particle size for both nanocomposites was less than 5 nm with a narrower size distribution when compared with pure CdS nanoparticles. The analyses from POM and DSC demonstrated that mass composition from 0.1:1.0 up to 0.5:1.0 of CdS:Ia nanocomposites showed their enantiotropic nematic phase. On the other hand, polarizing optical microscopy (POM) for IIa nanocomposites showed that the liquid crystal property vanished completely when the mass composition was at 0.2:1.0. PL emissions for CdS: Ia or IIa nanocomposites indicated deep trap defects occurred in these both samples. The PL results revealed that addition of CdS to Ia monomers suppressed the photoluminescence intensity of Ia. However, the introduction of CdS to IIa monomers increased the photoluminescence and was at a maximum when the mass composition was 0.3:1.0, then decreased in intensity as more CdS was added. The XPS results also showed that the stoichiometric ratios of S/Cd were close to 1.0:1.0 for both types of nanocomposites for a mass composition of 1.0:1.0 (CdS:matrix). Molecular Diversity Preservation International 2010-03-19 /pmc/articles/PMC5445895/ http://dx.doi.org/10.3390/ma3032069 Text en © 2010 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland. This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Article
Lee, Hooi Ling
Mohammed, Issam Ahmed
Belmahi, Mohammed
Assouar, Mohamed Badreddine
Rinnert, Hervé
Alnot, Marc
Thermal and Optical Properties of CdS Nanoparticles in Thermotropic Liquid Crystal Monomers
title Thermal and Optical Properties of CdS Nanoparticles in Thermotropic Liquid Crystal Monomers
title_full Thermal and Optical Properties of CdS Nanoparticles in Thermotropic Liquid Crystal Monomers
title_fullStr Thermal and Optical Properties of CdS Nanoparticles in Thermotropic Liquid Crystal Monomers
title_full_unstemmed Thermal and Optical Properties of CdS Nanoparticles in Thermotropic Liquid Crystal Monomers
title_short Thermal and Optical Properties of CdS Nanoparticles in Thermotropic Liquid Crystal Monomers
title_sort thermal and optical properties of cds nanoparticles in thermotropic liquid crystal monomers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5445895/
http://dx.doi.org/10.3390/ma3032069
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