Inorganic surface passivation of CdS nanocrystals resulting in strong luminescence

Nisha, K.D.; Navaneethan, M.; Ponnusamy, S.; Muthamizhchelvan, C.

doi:10.1016/j.jallcom.2009.07.078

Cited by 7 publications

(2 citation statements)

References 26 publications

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“…The DSC measurement of TG-CdS QDs in the range 50−350 °C (Figure S3) revealed an endothermic peak with a minimum at 112 °C, which is attributed to the evaporation of adsorbed water held by electrochemical interactions to the nanoparticle surface. 39,40 Contrastingly, the broad exothermic band centered in the range 200−225 °C can be assigned to structural relaxation processes (relaxation of defects and strains and/or stabilization via crystallization of an amorphous part of the CdS core 41 or to decomposition of the TG capping chains). The minor exothermic band appearing at slightly lower temperatures is correlated with nanoparticle growth.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Density of Grafted Chains in Thioglycerol-Capped CdS Quantum Dots Determines Their Interaction with Aluminum(III) in Water

et al. 2018

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We aimed to quantify the interaction of water-soluble-functionalized CdS quantum dots (QDs) with metal cations from their composition and physical properties. From the diameter of thioglycerol-capped nanoparticles (TG-CdS QDs) measured by electronic microscopy ( D = 12.3 ± 0.3 nm), we calculated the molecular mass of the individual particle MA = (3 ± 0.5) × 10 g·mol and its molar absorption coefficient ε = 21 × 10 M·cm. We built a three-dimensional model of the TG-CdS QDs in agreement with the structural data, which allowed us to quantify the number of thioglycerol grafted chains to ∼2000 per QD. This value fully matches the saturation binding curve of Al cations interacting with TG-CdS QDs. The reaction occurred with a slow association rate ( k = 2.1 × 10 M·s), as expected for heavy QDs. The photophysical properties of the functionalized QDs were studied using an absolute QD concentration of 7 nM, which allowed us to investigate the interaction with 14 metallic cations in water. The fluorescence intensity of TG-CdS QDs could be quenched only in the presence of Al ions in the range 0.2-10 μM but not with other cations and was not observed with other kinds of grafting chains.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Density of Grafted Chains in Thioglycerol-Capped CdS Quantum Dots Determines Their Interaction with Aluminum(III) in Water

et al. 2018

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“…In the previous reports, triethylamine (TEA) was used as a capping ligand for the synthesis of monodispersed CdS and PbS nanoparticles with a smaller size [15,16]. Hence, TEA was selected as a capping agent to synthesize the size-confined TiO 2 nanoparticles using wet chemical process.…”

Section: Introductionmentioning

confidence: 99%

Chemical synthesis of highly size-confined triethylamine-capped $$\hbox {TiO}_{2}$$ TiO 2 nanoparticles and its dye-sensitized solar cell performance

Prakash¹,

Navaneethan

Archana

et al. 2018

Bull Mater Sci

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TiO 2 nanoparticles were synthesized by a facile wet chemical synthesis using triethylamine (TEA) as a surface passivating agent. The role of TEA on the formation and functional properties of TiO 2 nanoparticles were investigated. Particle agglomeration was restricted and nanoparticle size was limited to 5 nm by passivating the amine molecule. Photoanodes were fabricated by spray deposition method using synthesized TiO 2 nanoparticles. The efficiency of 5.91% was obtained by the dye-sensitized solar cells.

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Synthesis of cluster like TiO2 mesoporous spheres and nanorods and their applications in dye-sensitized solar cells

Prakash¹,

Navaneethan

Archana

et al. 2017

J Mater Sci: Mater Electron

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Inorganic surface passivation of CdS nanocrystals resulting in strong luminescence

Cited by 7 publications

References 26 publications

Density of Grafted Chains in Thioglycerol-Capped CdS Quantum Dots Determines Their Interaction with Aluminum(III) in Water

Density of Grafted Chains in Thioglycerol-Capped CdS Quantum Dots Determines Their Interaction with Aluminum(III) in Water

Chemical synthesis of highly size-confined triethylamine-capped $$\hbox {TiO}_{2}$$ TiO 2 nanoparticles and its dye-sensitized solar cell performance

Synthesis of cluster like TiO2 mesoporous spheres and nanorods and their applications in dye-sensitized solar cells

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