Glycolthermal synthesis and characterization of hexagonal CdS round microparticles in flower-like clusters

Phuruangrat, Anukorn; Ekthammathat, Nuengruethai; Thongtem, Titipun; Thongtem, Somchai

doi:10.1016/j.jallcom.2011.08.065

Cited by 4 publications

(4 citation statements)

References 29 publications

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“…As shown in Figure 5, the characteristic emission of CdS NPs occurs at approximately 410, 445, and 620 nm. The emission at 620 nm is assigned to electron-hole recombinations at surface traps, whereas the higher-energy emission at 410 and 445 nm are attributed to recombination from the free excitons state in the interior of the crystallites [41,47,48]. Spectrum 5(ii) shows that an increase in the emission peak strength and bandwidth occurs in the CdSpolymer composite.…”

Section: Resultsmentioning

confidence: 99%

CdS Nanoparticles with a Thermoresponsive Polymer: Synthesis and Properties

Khan

2012

Journal of Nanomaterials

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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.

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Section: Resultsmentioning

confidence: 99%

CdS Nanoparticles with a Thermoresponsive Polymer: Synthesis and Properties

Khan

2012

Journal of Nanomaterials

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“…1 For example, anatase TiO 2 is the most studied semiconductor as an environmental cleanup photocatalyst owing to its photoactivity, stability, biocompatibility, and low cost. 8,36,38,[43][44][45] This study examined the structural evolution of the product in detail and proposed the formation process of the flower-like CdS. 1 Therefore, TiO 2 can only utilize a small part (<5%) of the solar spectrum, which limits its practical application as a photocatalyst.…”

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confidence: 99%

“…[5][6][7][8] The morphology and size of a semiconductor catalyst have a great effect on photocatalytic activity because reactants are in contact with the photocatalyst surface, where the catalytic reaction takes place. 8,36,38,[43][44][45] This study examined the structural evolution of the product in detail and proposed the formation process of the flower-like CdS. 9 Therefore, chemists and material scientists have made considerable efforts to control the morphology and size of CdS nanomaterials, and a range of CdS nanostructures have been obtained, such as quantum dots, 10,11 nanospheres, 12,13 nanorods, 13,14 nanowires, 15,16 nanobelts, 17,18 nanosheets, 19 nanotubes, 20 nanoboxes, 21 hierarchical nanostructures, [22][23][24][25][26] hollow nanostructures, 27,28 and flower-like nanostructures.…”

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confidence: 99%

“…This is different from common flower-like or spherical CdS nanomaterials with close and solid structures. 8,36,38,[43][44][45] This study examined the structural evolution of the product in detail and proposed the formation process of the flower-like CdS. The photocatalytic performance of the products was also evaluated by the degradation of several organic dyes under visible light irradiation.…”

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A facile template-free approach for fabrication of flower-like CdS: the evolutionary process of the structure and the performance of photocatalytic activity

Wang

et al. 2016

CrystEngComm

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Uniform flower-like CdS was fabricated successfully using a facile hydrothermal approach without templates or additives. The formation process of the flower-like structures was investigated in detail.The as-prepared flower-like CdS exhibited good photocatalytic activity for the photodegradation of various organic dyes.Semiconductor photocatalysis technology has been considered a promising strategy to solve environmental issues through the photodegradation of organic pollutants because it is an eco-friendly, low-cost and sustainable treatment. 1 For example, anatase TiO 2 is the most studied semiconductor as an environmental cleanup photocatalyst owing to its photoactivity, stability, biocompatibility, and low cost. 2-4 On the other hand, TiO 2 has a high band gap and responds to UV light only. 1 Therefore, TiO 2 can only utilize a small part (<5%) of the solar spectrum, which limits its practical application as a photocatalyst. Therefore, considerable efforts have been made to find efficient photocatalysts that can effectively degrade organic pollutants under visible light irradiation. As an important II-VI semiconductor, cadmium sulfide (CdS) is an ideal visible light driven photocatalyst because of its narrow and direct band gap (at room temperature is approximately 2.42 eV), which corresponds well to the solar spectrum. Therefore, CdS has been extensively studied in diverse photocatalytic fields, such as reduction of nitro organics, water splitting and dye degradation. [5][6][7][8] The morphology and size of a semiconductor catalyst have a great effect on photocatalytic activity because reactants are in contact with the photocatalyst surface, where the catalytic reaction takes place. For CdS nanostructures, the morphology and size play important roles in the optical and physical properties. 9 Therefore, chemists and material scientists have made considerable efforts to control the morphology and size of CdS nanomaterials, and a range of CdS nanostructures have been obtained, such as quantum dots, 10,11 nanospheres, 12,13 nanorods, 13,14 nanowires, 15,16 nanobelts, 17,18 nanosheets, 19 nanotubes, 20 nanoboxes, 21 hierarchical nanostructures, 22-26 hollow nanostructures, 27,28 and flower-like nanostructures. 8,29 To fabricate CdS nanostructures with the desired morphology and different sizes, various synthetic approaches have been developed, such as chemical vapor deposition, 30 thermal evaporation, 31 thermal decomposition, 32,33 the vapor-liquid-solid process, 18,34 electrodeposition, 16 the template method, 21,35 microwave-assisted aqueous synthesis, 36 solvothermal synthesis, 37-39 and the hydrothermal method. 29,40-42 Of these, the hydrothermal method has been demonstrated to be an effective approach for fabricating CdS nanomaterials. For example, Salavati-Niasari et al. have reported the size-controlled synthesis of a CdS nanostructure by a mild and simple hydrothermal method. 29 Herein, we show a facile hydrothermal approach to synthesize flower-like CdS nanomaterials with uniform size and good dispersibi...

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