Indian Journal of Physics

, Volume 89, Issue 8, pp 845–855 | Cite as

Optical properties of DNA induced starch capped PbS, CdS and PbS/CdS nanocomposites

Original Paper
First Online:
Received:
Accepted:

Abstract

Starch capped PbS, CdS and PbS–CdS nanocomposites are conjugated with Calf–Thymus DNA. All the materials are characterized by X-ray diffraction, high-resolution transmission electron microscopy, UV–Vis spectroscopy and photoluminescence spectroscopy. The x-ray diffraction patterns of PbS and CdS show that the materials possess polycrystalline having both cubic and hexagonal phases. High resolution transmission electron microscopic results (HRTEM) shows PbS nanoparticles of size 3 nm and that of CdS nanoparticles having average size 4 nm which exhibit tendency of agglomeration. In case of PbS/CdS, it exhibits different types of nanosheets. The UV absorption spectra of all the samples exhibit clear blue-shift with the respective bulk absorption edges. This is attributed to the strong quantum confinement in the materials. The absorption spectra also exhibit increase of the band gaps from 2.25 to 4.35 eV for PbS; 2.25–4.2 eV for CdS with decrease of molarities from 0.1 to 0.001 M as well as conjugated with DNA. The photoluminescence spectra of all PbS, CdS and PbS/CdS composites synthesized at 0.1 M molar concentration show a further blue shift and an enhancement of intensity after conjugation with DNA, but the effect is reversed i.e. occurrence of red shift and reduction of intensity for those having 0.01 M. This is due to the two competing processes of surface passivation as well as stabilization of nanocomposites governed by bio-molecules and that of Dexter energy transfer with the effective charge separation. The result shows the applicability of the materials in development of biological labels and biosensors.

Keywords

Nanocomposites CBD DNA Starch Agglomeration Biosensor 

PACS Nos.

78.40.Fy 78.55.Cr 78.55.Et 
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Notes

Acknowledgments

We acknowledge Department of Chemistry, Gauhati University for providing UV–Vis and PL Characterization, CIF and Department of Physics, IIT Guwahati for giving the facilities for HRTEM and XRD measurements. We also acknowledge Department of Bio-Technology, Gauhati University for providing the DNA solution.

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Copyright information

© Indian Association for the Cultivation of Science 2015

Authors and Affiliations

  1. 1.Department of PhysicsCotton CollegeGuwahatiIndia
  2. 2.Nano Science Research LaboratoryGuwahati CollegeGuwahatiIndia

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