Construction of CdS quantum dots via a regioselective dendritic functionalized cellulose template

Hwang, Seok‐Ho; Moorefield, Charles N.; Wang, Pingshan; Jeong, Kwang‐Un; Cheng, Stephen Z. D.; Kotta, Kishore K.; Newkome, George R.

doi:10.1039/b607352b

Cited by 34 publications

(16 citation statements)

References 27 publications

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“…With the decrease of the size of CdS particle, the absorption threshold shifts to shorter wavelengths as a result of quantum confinement effect [13]. Figure 4A presents the UV-Vis absorption spectra of CdS NCs taken at different refluxing times (15 min and 120 min, respectively).…”

Section: Optical Properties Analysismentioning

confidence: 99%

<b>Facile synthesis of CdS nanocrystals using thioglycolic acid as a sulfur source and stabilizer in aqueous solution</b>

Wang¹,

Lu²,

Tong³

et al. 2011

Bull. Chem. Soc. Eth.

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ABSTRACT ABSTRACT. A novel method has been developed for the synthesis of CdS nanocrystals (NCs) using thioglycolic acid (TGA) as a sulfur source and stabilizer with the presence of hydrogen peroxide in an aqueous medium. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) spectroscopy. The results indicate that the product was of zincblend crystal structure in a sphere-like shape. The room-temperature luminescence spectra revealed that the emission peak of CdS NCs prepared in relatively short refluxing times (10-120 min) could be tuned from 518 nm to 610 nm, and the photoluminescence quantum yield of the as-prepared CdS NCs could reach as high as 12.6%. In addition, the mechanism of the CdS nanocrystals formation was preliminarily discussed. KEY WORDS KEY WORDS KEY WORDS

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Section: Optical Properties Analysismentioning

confidence: 99%

<b>Facile synthesis of CdS nanocrystals using thioglycolic acid as a sulfur source and stabilizer in aqueous solution</b>

Wang¹,

Lu²,

Tong³

et al. 2011

Bull. Chem. Soc. Eth.

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“…For example, they exhibit significantly low intrinsic viscosities in solution because of their globular shapes, which is particularly valuable for composite processing. Hassan and coworkers regioselectively dendronized cellulose with diverse siloxy and carbamate dendrons with different peripheral groups by homogenous substitution reactions (Hassan et al 2005;Hassan et al 2004;Hwang et al 2006). The dendronized celluloses possess a wide range of solubilities in organic solvents.…”

Section: Introductionmentioning

confidence: 99%

“…The dendronized celluloses possess a wide range of solubilities in organic solvents. Similarly, Heinze and Pohl et al dendronized cellulose with polyester and polyamidoamine dendrons (Heinze et al 2007;Heinze et al 2008;Hwang et al 2006;Pohl et al 2009) to make it soluble in polar solvents. In addition to enhancing solubility of cellulose, the dendronization can also endow cellulose novel properties and applications.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to enhancing solubility of cellulose, the dendronization can also endow cellulose novel properties and applications. For example, Hwang et al dendronized cellulose with polycarbamate and then used the functionalized cellulose as a template to fabricate well-ordered CdS quantum dots (Hwang et al 2006). Recently, Montañez et al has applied polyester-dendronized cellulose to biosensors (Montañez et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of cellulose fibers grafted with hyperbranched poly(3-methyl-3-oxetanemethanol)

et al. 2011

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Hyperbranched poly(3-methyl-3-oxetanemethanol) (HBPO) was directly grafted from the surface of cellulose fibers (CF) through a surface hydroxyl group-initiated ring-opening polymerization of 3-methyl-3-oxetanemethanol (MOM). TOF-SIMS, XPS, AFM, ATR-FTIR, and TGA were utilized for characterizing the resultant HBPO-grafted cellulose fibers. The content of grafted HBPO is easily adjustable by controlling feeding dosage of the MOM. To verify the reactivity of hydroxyl groups in the grafted HBPO, poly(e-caprolactone) (PCL) was further grafted from the HBPO-grafted cellulose surface.

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“…Hassan et al 23 studied the preparation of new dendronized cellulose derivatives, which were used in the preparation of cadmium sulfide quantum dots/cellulose nanocomposites. 24 Ruan et al 25 studied preparation and properties of CdS nanocrystals/regenerated cellulose nanocomposites by using in situ synthesizing method during cellulose dissolution in NaOH/thiourea system. Small et al 26 studied the preparation of ZnS doped nanocrystals and mechanical and optical properties of cellulose-ZnS: Cu and cellulose-ZnS: Mn nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, optical, and electrical properties of cellulosic semiconductor nanocomposites

Hassan

Ward

Eid

2009

J of Applied Polymer Sci

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Photoluminescent cellulose fibers were prepared by impregnation of bleached bagasse pulp with the different cadmium and zinc sulfides nanostructures, namely, CdS, ZnS, CdS/ZnS, ZnS/CdS (Core/shell nanostructures), CdS/ZnS/CdS and ZnS/CdS/ZnS multilayered nanostructures. The prepared cellulosic nanocomposites were characterized regarding strength properties (tensile strength, tensile energy absorption, and burst resistance), optical properties (fluorescence emission), thermal stability, and dielectric properties. The strength properties of paper sheets nanocomposites impregnated with different nanoparticles solutions were noticeably decreased in spite of the very low loading of the fibers with the semiconductor nanoparticles. The decrease in tensile index, tensile energy absorption, and burst index of paper sheets nanocomposites are found to be ranged from 12-27, 13-36, and 11-38 %, respectively. The different paper sheets nanocomposites showed fluorescence emission different from the as prepared polyethyleneimine-stabilized nanoparticles. Thermogravimetric analysis results showed that: the semiconductor nanoparticles did not affect the onset degradation temperature of cellulosic fibers but it caused faster termination of the main degradation step. The dielectric loss and the dc-conductivity of cellulosic fibers increased as a result of impregnating the fibers. The nature of the nanoparticles and the properties of the interphases strongly influenced the dielectric properties of the cellulosic/semiconductors nanocomposites.

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Construction of CdS quantum dots via a regioselective dendritic functionalized cellulose template

Abstract: Using regioselective dendritic functionalized cellulose, CdS quantum dot nanoparticles were prepared and their photo-optical properties and morphology as well as the preliminary biocompatibility of the hybrid were investigated.

Cited by 34 publications

References 27 publications

<b>Facile synthesis of CdS nanocrystals using thioglycolic acid as a sulfur source and stabilizer in aqueous solution</b>

<b>Facile synthesis of CdS nanocrystals using thioglycolic acid as a sulfur source and stabilizer in aqueous solution</b>

Synthesis and characterization of cellulose fibers grafted with hyperbranched poly(3-methyl-3-oxetanemethanol)

Mechanical, optical, and electrical properties of cellulosic semiconductor nanocomposites

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