Studies on CdS nanoparticles prepared in DNA and bovine serum albumin based biotemplates

Abstract

This paper discusses band gap tunability of CdS nanoparticles in biotemplates deoxyribonucleic acid (DNA) and bovine serum albumin (BSA). DNA is more efficient in controlling the size of the nanoparticles compared to BSA. Since nanoparticles are capped with biomaterials, they are very useful for biolabeling. The photo luminescence spectrum of CdS nanoparticles in DNA template shows sharp emission peak at 490 nm with shoulders at 430 nm and 530 nm while that of CdS in BSA template has emission peak at 530 nm with shoulders at 477 nm and 410 nm. The excitation wavelength dependent shift of photoluminescence peak is found to be between 40 and 50 nm for a change in excitation wavelength from 260 to 420 nm. We also studied excitation wavelength dependence on fluorescence emission of CdS nanoparticles stabilized with DNA and BSA.