Manganese-Doped ZnS QDs: an Investigation into the Optimal Amount of Doping

Tomar, Sanjeev; Gupta, Sunil; Mukherjee, Sayak; Singh, Arun; Kumar, Sunil; Choubey, Ravi Kant

doi:10.1134/s106378262011024x

Cited by 21 publications

(7 citation statements)

References 30 publications

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“…2.1. Synthesis of 2% manganese doped zinc sulphide quantum dots Synthesis of Zn 0.98 Mn 0.02 S QDs was done as described in our previous works [11] using the co-precipitation method. Zinc acetate dihydrate…”

Section: Methodsmentioning

confidence: 99%

“…Similarly, peak around 3020 cm −1 observed in the FTIR spectrum of the uncapped Zn 0.98 Mn 0.02 S QDs are commonly attributed to C-H stretching vibrations, and the peaks around 1740 cm −1 and 1440 cm −1 are commonly attributed to the asymmetric and symmetric C=O stretching vibrations, respectively. Further, in the FTIR spectrum of the uncapped Zn 0.98 Mn 0.02 S QDs, oxygen bending and stretching is responsible for the vibration peaks from 1500-900 cm −1 , and peaks around 700 cm −1 correspond to sulphides, and can be attributed to the stretching vibration of the Zn-S [11,[26][27][28].…”

Section: Fourier-transform Infrared Spectroscopymentioning

confidence: 95%

“…The PLE plot of the uncapped Zn 0.98 Mn 0.02 S QD is shown in the inset and shows a well-defined excitonic peak at about 310 nm, which is also the absorption edge, and a continuous emission band from about 330-440 nm. This continuous band can be deconvoluted into different Gauss peaks which can be attributed to various possible transitions facilitated by structural defects and dangling bonds [11,20]. The PLE plots of the Zn 0.98 Mn 0.02 S@SiO 2 QD show high intensity peaks at distinct wavelengths, which can be attributed to specific transitions occurring in the material.…”

Section: Photoluminescence Emission Spectroscopymentioning

confidence: 97%

“…Synthesis of Silica capped 2% Manganese doped Zinc Sulphide Quantum Dots Synthesis of Zn 0.98 Mn 0.02 S@SiO 2 QDs was done by the one-step Stober process. Firstly, Zn 0.98 Mn 0.02 S QDs were synthesised using the simple co-precipitation method as described previously [11]. The Zn 0.98 Mn 0.02 S QD powder thus obtained was used as the seed material for the growth of the Silica shell.…”

Section: One Step Stober Processmentioning

confidence: 99%

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Optical properties of Silica capped Mn doped ZnS quantum dots

et al. 2021

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In the present report, silica capped ZnS quantum dots (QDs) have been synthesized using one-step Stober process. The bare Mn doped ZnS samples have been prepared by the co-precipitation method. The samples have then been coated by a SiO2 layer. X ray diffraction have been used to confirm the presence of desired phases and the absence of any impurity phase. The particle size and morphology have been studied through high resolution transmission electron microscopy (HRTEM). The absorption and the emission properties of the bare and the capped samples have been studied through UV-visible and photoluminescence spectroscopy respectively. Fourier-transform infrared (FTIR) spectroscopy was employed to study the band resonances of the samples.

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Section: Methodsmentioning

confidence: 99%

Section: Fourier-transform Infrared Spectroscopymentioning

confidence: 95%

Section: Photoluminescence Emission Spectroscopymentioning

confidence: 97%

Section: One Step Stober Processmentioning

confidence: 99%

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Optical properties of Silica capped Mn doped ZnS quantum dots

et al. 2021

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“…Energy band gap (E g ) values of the uncapped TZO and GSH capped TZO nanostructures were determined from the UV-visible absorption spectroscopy data using the Tauc relation [38][39][40] and shown in figure 6(b). The calculated optical energy band gap values found to be 3.35, 3.50, 3.53, and 3.39 eV for the uncapped TZO, 0.1%-GSH-TZO, 0.5%-GSH-TZO and 0.75%-GSH-TZO nanostructures, respectively.…”

Section: Uv-vis Absorption Spectroscopymentioning

confidence: 99%

Effect of glutathione capping on the antibacterial activity of tin doped ZnO nanoparticles

Kumar¹,

Kavita²,

Bhatti³

et al. 2021

Phys. Scr.

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In the present study, we first synthesized pristine ZnO and Sn doped ZnO nanoparticles (NPs) then capped the synthesized NPs by Glutathione at different capping concentrations. The structural, morphological, and optical properties of synthesized NPs was examined by x-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), UV-visible, and energy resolved photoluminescence spectroscopy. The XRD analysis confirmed the formation of wurtzite crystal structure of ZnO nanocrystallites while TEM micrographs showed the formation of dendrite nanostructure at higher capping concentration of glutathione in Sn doped ZnO NPS. Strong absorption band around 2525 cm −1 in the IR spectrum indicates the presence of S-H stretching vibration of glutathione which has been disappeared in glutathione capped ZnO NPs. Blue shift in absorption edge was observed in glutathione capped ZnO NPs as compared to uncapped NPs. Moreover, the synthesized NPs showed excellent response against both Gram positive bacteria (Streptococcus sp. & Staphylococcus sp.) and Gram negative (E. coli & Klebsiella sp.) bacteria. Maximum zone of inhibition has been observed with glutathione capped Sn doped ZnO nanostructures. Hence, it can be concluded from the present investigation that the optimization of capping concentration will be very beneficial to exploit Sn doped ZnO semiconductor nanostructures as a coating material for different chemotherapeutic drugs.

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