Luminescent core@shell nanoparticles functionalized with PEG for biological applications
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In this manuscript, synthesis of TGA (thioglycolic acid) capped core@shell CdSe@CdS nanoparticles (NPs) has been done using chemical route. PEG-diamine has been used to functionalize spherical core@shell CdSe@CdS NPs by carbodiimide chemistry, which is very simple and effective method to make stable bond between NH2 group and COOH group. Optical properties include UV-Visible absorption and fluorescence emission that show the higher polydispersity and enhanced emission intensity of CdSe@CdS-PEG NPs in comparison to CdSe@CdS core@shell NPs. FT-IR results of CdSe@CdS-PEG NPs indicate the intermolecular interaction between PEG-diamine and TGA capped CdSe@CdS core@shell NPs. The emission intensity of CdSe@CdS and CdSe@CdS-PEG NPs is highest when dispersed in pH 6 medium which is low acidic in nature. Therefore, these colloidal NPs can be used for applications in the pH range (6–8), due to their stability and higher fluorescence emission in this pH range.
KeywordsColloidal NPs Luminescence Buffer solutions Crosslinker Dispersity
Miss. Shivani Bharti is thankful to Department of Science and Technology (DST), India, for providing the INSPIRE fellowship. We are also thankful to Dr. Samrat Mukhopadhyay, Department of Chemical Sciences, IISER Mohali for providing FluoroMax®-4 Spectrofluorometer facility.
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Conflict of interest
The authors declare that they have no conflict of interest.
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