Synthesis and characterisation of functional manganese doped ZnS quantum dots for bio-imaging application

Manju Singhal, J. K. Sharma, H. C. Jeon, T. W. Kang, Sunil Kumar

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Fluorescent quantum dots (QDs) are potential candidates for bio-imaging but major problems in using them for bio-imaging applications are either bandgaplyinginUVregionorthecytotoxicity 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 thesurfaceofZnSQDs.BothUVexcitedandIRexcited 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.

Original languageEnglish
Pages (from-to)321-328
Number of pages8
JournalAdvances in Applied Ceramics
Volume118
Issue number6
DOIs
StatePublished - 2019

Keywords

  • Biological window
  • Glutathione
  • Photoluminescence
  • Quantum dots
  • ZnS:Mn

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