CdS Nanoparticles with a Thermoresponsive Polymer: Synthesis and Properties

Abstract

This paper describes the synthesis of thermoresponsive colloidal nanocomposites based on CdS and poly(N-isopropylacrylamide). The CdS nanoparticles were prepared at room temperature from cadmium chloride and sodium sulfide salts in the presence of an organic ligand, 3-mercaptopropionic acid (MPA). The as-prepared MPA-bound CdS nanoparticles were stable for more than 30 days and exhibited good optical properties. The effect of various ratios of MPA/Cd2+and H2O/DMF (dimethylformamide) on the particle size of the CdS nanoparticles was investigated using UV-vis absorption measurements. Transmission electron microscopy studies showed that the particle sizes were approximately 4 nm in diameter, which is consistent with the size obtained using UV-vis spectroscopy. The CdS nanocomposite showed a temperature-responsive phenomenon as its temperature increased from 20 to 45°C.

Blue Organic-Inorganic Light Emitting Diode Based on Electroluminescence CdS Nanoparticle

“…Those processes are depicted in Figure 4. This analysis is in good agreement with that of Khan [15] and Cerdan-Pasaran et al [16]. The excitations are through the energy transfer from TPD to CdSNPs due to the fact that the EL device structures are with sub-10 nm separation between the TPD and CdSNPs [17].…”

“…Cadmium sulfide nanoparticles (CdSNPs) are (II-VI) semiconductor materials, which have direct energy gap of (2.42 eV). It is of quite a small size, so quantum dots show optoelectronic behavior that differs from the bulk semi-conductors of identical compositions [15][16][17]. The electroluminescence (EL) of CdS bulk is at 515 nm in the green zone, but it is around 450 nm in the blue zone for CdSNPs, which is used to make NPsLED or organicinorganic LED (OILED) in the blue zone by material emission in the green zone by taking advantage of nanoparticle properties and defect conditions [18] [19].…”

Synthesis and Characterization of Metal Sulfides Nanoparticles/Poly(methyl methacrylate) Nanocomposites

“…Recent researches have focused on the synthesis, characterization, and optical properties of metal sulfides/polymer nanocomposites such as ZnS/PMMA and CdS/PMMA nanocomposites [13]. The incorporation of metal sulfide nanocrystals into polymer matrices has been accomplished via direct blending [14,15], in situ synthesis of nanoparticles within polymer media [16,17], and surface modification of nanoparticles with monomers followed by polymerization from nanoparticle surface and grafting of preformed functionalized polymers to nanoparticles [18].…”