Abstract
The present work describes the tunable emission in inorganic-organic hybrid NPs which can be useful for optoelectronic and biosensing applications. In this work, Mn- ZnS nanoparticles emitting various colors, including blue and orange, were synthesized by simple chemical precipitation method using chitosan as a capping agent. Earlier reports describe that emission color characteristics in nanoparticles are tuned by varying particle size and with doping concentration. Here in this article tunable emission has been achieved by varying excitation wavelength in a single sample. This tunable emission property with high emission intensity was further achieved by changing capping concentration keeping host Mn-ZnS concentration same. Tunable emission is explained by FRET mechanism. Commission Internationale de l’Eclairage (CIE) chromaticity coordinates shifts from (0.273, 0.20) and (0.344, 0.275) for same naocrystals by suitably tuning excitation energy from higher and lower ultra-violet (UV) range. Synthesized nanoparticles have been characterized by X-ray diffraction, SEM, HRTEM, UV- Visible absorption and PL spectroscopy for structural and optical studies. Using tunable emission property, these highly emissive nanoparticles functionalized with biocompatible polymer chitosan were further used for glucose sensing applications.
Highlights
Semiconductor nanoparticles (NP’s) exhibit tunable emission either by size selective synthesis or by doping suitable transition metal ions in wide band gap nanocrystals (NC’s)
This is confirmed from the fast Fourier transform (FFT) pattern of the HRTEM image, as shown in the lower right inset of Fig. 3(c)
Here we report broad peak centered at 400nm due to sulphur vacancies and adsorbed chitosan with tenfold rise in emission intensity in comparison to previously synthesized samples
Summary
Our group has reported a tunable emission in manganese doped and capped ZnS NPs where single sample of defined concentration emit two colors (orange and green).[17,18] In that case it was achieved by changing excitation wavelength from 215nm to 320nm in organic inorganic doped hybrid nanocomposites. These synthesized samples were used for biosensing applications using fluorescence studies. 400nm to 587nm have been reported for same sample with tenfold increase in emission intensity than previously synthesized samples.[18]
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