Photoluminescence Properties of CdSe Nanocrystals from Water into Organic Phase Using 1‐Dodecylmercaptan as Phase Transfer Reagent

Mu, Jin; Gao, Xubin; Zhang, Yunyan; Sun, Hua; Liu, Lingyun

doi:10.1081/dis-200066734

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…Purification of nanoparticles by centrifugation (purification-dissolution method) [9] is also widely used in the fabrication of nanocomposite materials, but this method is technologically complex and labor intensive [10]. Since small CdSe nanoparticles are known to be able to be quickly extracted in water-immiscible organic solvents [11], we proposed a method for the preparation of CdSe nanocrystals by electrosynthesis from aqueous solutions with their simultaneous extraction into xylene. Empirically, we have found that along with the formation of large CdSe cathode deposits (20-150 nm) a colloidal solution of CdSe nanoparticles (2-5 nm) is also formed during dc electrolysis.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical synthesis and optical properties of ultra-fine CdSe nanoparticles

et al. 2016

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Colloidal solutions (*0.3 mol/L) of CdSe nanoparticles in xylene have been synthesized by the electrochemical method from an acid electrolyte based on HNO 3 ? HCl (2:1) mixture using extraction into xylene. It has been found that CdSe nanoparticles of small size (2-5 nm) synthesized on the cathode are readily extractable in xylene, whereas nanoparticles of larger size (20-100 nm) remain in the aqueous electrolyte and dissolve in the nitric-hydrochloric acids mixture. An X-ray phase analysis of powders of 2-5 nm CdSe nanoparticles showed them have a mixed cubic/hexagonal crystal structure. It has been found from measurements of absorption and photoluminescence spectra that the CdSe nanoparticles of this structure have a broad photoluminescence band (k max = 500 nm) at a narrow absorption peak (k max = 420 nm), which may be due to stacking fault formation in nanoparticles of mixed cubic/hexagonal structure. Using this electrolyte with a xylene surface layer under continuous electrolysis conditions and extraction of 2-5 nm CdSe nanoparticles with a content of up to 0.05 g in 1 cm 3 xylene (*0.3 mol/L) was obtained. Such colloidal solution can be used to obtain optical nanocomposites by incorporation CdSe nanoparticles into a liquidcrystalline cadmium caprylate matrix. The spectral characteristics such of composites have been studied by adsorption spectroscopy and fluorescence.

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Section: Introductionmentioning

confidence: 99%