Abstract
This paper reports functionalized zinc sulphide (ZnS) semiconductor nanocrystals (quantum dots, approx., 2.5 nm) which are an important building block in self-assembled nanostructures. ZnS is functionalized by organic stabilizer Thio glycolic acid (TGA). The samples have been synthesized by colloidal technique at relatively low temperature (below 100°C) at an atmospheric pressure of 10−3 torr. Manganese (Mn) doping ions have been incorporated (doped) in ZnS host lattice and observed its effect on growth morphology and optical properties of ZnS colloidal nanocrystals. By XRD, SEM, TEM, and PL, the obtained cubic phase nanosized TGA-capped ZnS materials were characterized. The morphology of ZnS obtained at different temperatures are analyzed by SEM. The crystallite size of the ZnS nanoparticles was estimated from the X-ray diffraction pattern by using Scherrer’s formula (approximately 2.5 nm) which is confirmed by TEM. The estimated bandgap value of ZnS NC’s by ()2 versus plot was 4.89 eV. Gaussian fitting curve in photoluminescence (PL) spectra indicated room temperature emission wavelength range from 300 to 500 nm in undoped and Mn-doped ZnS, with different emission peak intensities, and suggested the wide band emission colours in visible and near UV region which has wider applications in optical devices.
Highlights
Zinc sulfide (ZnS), group II-VI compound semiconductor, is having great interest for its practical applications in optoelectronics and photonics [1,2,3,4,5,6,7,8,9]
This paper reports the ZnS QD’s of size approximately 2.5 nm ISRN Optics with varying morphologies, depending on the concentration of dopant ion and temperature
The ZnS nanocrystal size was controlled by the synthesis temperature
Summary
Zinc sulfide (ZnS), group II-VI compound semiconductor, is having great interest for its practical applications in optoelectronics and photonics [1,2,3,4,5,6,7,8,9]. Because of its wide bandgap (3.73 eV), it has a high index of reflection and a high transmittance in the visible range, suitable for host material for a large variety of dopants. A variety of methods have been reported for the preparation of nano-ZnS These methods include soft solution synthesis, sol-gel synthesis, chemical vapor deposition, hydrothermal conditions, microwave irradiation, and so forth [17,18,19,20,21,22,23,24,25,26,27]. The colloidal synthesis route is another novel method of synthesis and is a developing area in the field of research In this technique, concentration of reagent, capping agent to precursor ratio, pH, time, and temperature play important role to control the morphology and size of the ZnS nanoparticle. The photoluminescence emission spectra of TGA-capped manganese- (Mn2+-) doped and undoped ZnS colloidal nanocrystals suggests the wide band emission colours in visible and near UV region
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call