Nano Archive

One-pot synthesis of oleic acid-capped cadmium chalcogenides (CdE: E = Se, Te) nano-crystals

Khanna, P. K. and Srinivasa Rao, K. and Patil, K. R. and Singh, V. N. and Mehta, B. R. (2010) One-pot synthesis of oleic acid-capped cadmium chalcogenides (CdE: E = Se, Te) nano-crystals. Journal of Nanoparticle Research, 12 (1). pp. 101-109.

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Surface-capped CdSe and CdTe nano-crystals (NCs) have been synthesized using cadmium acetate, oleic acid and respective tri-octylphosphine chalcogenide (TOPE; E = Se/Te) in diphenyl ether (DPE). Well-dispersed CdSe particles showed two absorption bands at the region of 431–34 and 458–60 nm in optical absorption study. A band-edge emission resulted at 515 nm with an excitation energy of 400 nm, in its photoluminescence (PL) spectrum. Similarly, UV–visible absorption study of CdTe revealed an absorption band at <700 nm. The broadened X-ray diffraction (XRD) pattern showed that at higher reaction temperature cubic CdSe but hexagonal CdTe can be obtained with crystallite size of <10 nm. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that agglomerated particles are of spherical nature. The inter-planar spacing in CdTe was measured to be 0.406 nm, a characteristic of (100) lattice plane in hexagonal CdTe. X-ray photoelectron spectroscopy (XPS) showed that CdSe NCs have better air stability stable than CdTe. Presence of organic moiety around the semiconductor particles was confirmed by infra-red (IR) spectroscopy.

Item Type:Article
Uncontrolled Keywords:Semiconductors - Surface capping - Chemical synthesis - Photoluminescence
Subjects:Analytical Science > Microscopy and probe methods
Physical Science > Nanoelectronics
Material Science > Nanostructured materials
Material Science > Nanochemistry
Engineering > Nanotechnology applications in ICT
Physical Science > Photonics
ID Code:8140
Deposited By:IoN
Deposited On:21 Jan 2010 16:34
Last Modified:21 Jan 2010 16:34

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