Structural and optical properties of solvothermal synthesized nearly monodispersed CdSe nanocrystals

Shahi, A K and Pandey, B K and Singh, B P and Gopal, R (2016) Structural and optical properties of solvothermal synthesized nearly monodispersed CdSe nanocrystals. In: ADVANCES IN NATURAL SCIENCES-NANOSCIENCE AND NANOTECHNOLOGY, 7 (3).

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Abstract

Water soluble nearly monodisperse CdSe nanocrystals have been successfully synthesized via aqueous phase solvothermal route in non ionic surfactant glycolic acid ethoxylate 4-non phenyl ether (GAEPE). X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) are used to determine the phase, structural parameters such as lattice constants, strain, x-ray density and specific surface area, morphology, shape and size distribution, respectively, whereas optical properties are studied by UV-visible absorption and photoluminescence (PL) spectroscopy. All the diffraction peaks of XRD pattern indexed to wurtzite phase of hexagonal system of CdSe and crystallite sizes estimated to be 13-29 nm along some stronger and narrower peaks which is also consistent with TEM measurement while crystallinity and defects have been analyzed with selective area electron diffraction (SAED) pattern. Optical absorption spectrum shows that the as prepared sample exhibits primary and secondary absorption band centered at 2.15 eV and 1.82 eV, respectively, which is blue shifted as compared to bulk value (1.74 eV) of band gap due to quantum confinement effect. Photoluminescence spectrum shows sharp excitonic emission band centered at 583 nm which is nearer to primary band gap energy.

Item Type:	Journal Article
Publication:	ADVANCES IN NATURAL SCIENCES-NANOSCIENCE AND NANOTECHNOLOGY
Publisher:	IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Additional Information:	Copy right for this article belongs to the IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	21 Mar 2017 09:46
Last Modified:	21 Mar 2017 09:46
URI:	http://eprints.iisc.ac.in/id/eprint/56418

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