Synthesis and characterisation of functional manganese doped ZnS quantum dots for bio-imaging application. (18th August 2019)

• Record Type: Journal Article
• Authors: Singhal, Manju; Sharma, J. K.; Jeon, H. C.; Kang, T. W.; Kumar, Sunil
• Is Part Of: Advances in applied ceramics. Volume 118:Number 6(2019)
• Page Start: 321
• Page End: 328
• Publication Date: 2019-08-18
• Subjects: ZnS:Mn -- quantum dots -- glutathione -- photoluminescence -- biological window; Ceramics -- Periodicals; 620.1405
• DOI: 10.1080/17436753.2019.1587937
• Languages: English
• ISSNs: 1743-6753

Abstract

ABSTRACT: Fluorescent quantum dots (QDs) are potential candidates for bio-imaging but major problems in using them for bio-imaging applications are either bandgap lying in UV region or the cytotoxicity of the visible light-excited cadmium-based QDs. Keeping these things in mind, glutathione (GLT) functionalised Mn-doped ZnS QDs has been studied to make a desired fluorescent system for bioimaging application. XRD measurements show that grain size decreases at higher concentration of GLT capping on Mn-doped quantum dots. UV–visible studies show that the band gap shows a blue shift at higher GLT concentration. FTIR studies confirm GLT functionalisation on the surface of ZnS QDs. Both UV excited and IR excited photoluminescence spectrum of samples exhibited a tunable orange emission intensity with increase in GLT concentration however multiphoton infrared excited spectra was used to show the feasibility of GLT functionalised ZnS:Mn quantum dots for a real application in a biological window of 650–950 nm.