Single-step synthesis of hyperbranched, luminescent Mn2+-doped ZnSe1−xSx nanocrystals using dichalcogenide precursors

Yazdanparast, Mohammad S.; Webb, Matthew T.; McLaurin, Emily J.

doi:10.1039/c6tc01207h

Cited by 6 publications

(9 citation statements)

References 57 publications

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“…The samples were prepared in a cuvette with a stir bar. A syringe pump was used for the titration, with injection of thiol via a syringe as described previously [ 66 ]. While stirring, spectra were taken at intervals of 2–30 min, depending on sample brightness and sensitivity.…”

Section: Methodsmentioning

confidence: 99%

Mn2+-ZnSe/ZnS@SiO2 Nanoparticles for Turn-on Luminescence Thiol Detection

Yazdanparast

Jeffries

Gray

et al. 2017

JFB

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Biological thiols are antioxidants essential for the prevention of disease. For example, low levels of the tripeptide glutathione are associated with heart disease, cancer, and dementia. Mn2+-doped wide bandgap semiconductor nanocrystals exhibit luminescence and magnetic properties that make them attractive for bimodal imaging. We found that these nanocrystals and silica-encapsulated nanoparticle derivatives exhibit enhanced luminescence in the presence of thiols in both organic solvent and aqueous solution. The key to using these nanocrystals as sensors is control over their surfaces. The addition of a ZnS barrier layer or shell produces more stable nanocrystals that are isolated from their surroundings, and luminescence enhancement is only observed with thinner, intermediate shells. Tunability is demonstrated with dodecanethiol and sensitivities decrease with thin, medium, and thick shells. Turn-on nanoprobe luminescence is also generated by several biological thiols, including glutathione, N-acetylcysteine, cysteine, and dithiothreitol. Nanoparticles prepared with different ZnS shell thicknesses demonstrated varying sensitivity to glutathione, which allows for the tuning of particle sensitivity without optimization. The small photoluminescence response to control amino acids and salts indicates selectivity for thiols. Preliminary magnetic measurements highlight the challenge of optimizing sensors for different imaging modalities. In this work, we assess the prospects of using these nanoparticles as luminescent turn-on thiol sensors and for MRI.

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Section: Methodsmentioning

confidence: 99%

Mn2+-ZnSe/ZnS@SiO2 Nanoparticles for Turn-on Luminescence Thiol Detection

Yazdanparast

Jeffries

Gray

et al. 2017

JFB

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“…Dichalcogenides have been used to synthesize nanocrystals of different ternary, quaternary, and quinary metal chalcogenide, such as ZnSe 1– x S x , Cu 2 ZnSn(SSe) 4 , Cu 2 CdSn(S 1– x Se x ) 4 , Sn x Ge 1– x Se, Cu 2– x SySe 1– y , Cu 2 SnSe 3 , and CuFeSe 2 . But there are just a few studies on reaction of mixtures of dichalcogenides.…”

Section: Introductionmentioning

confidence: 99%

“…Self-assembly and oriented attachments of NCs leads to formation of new structures as well. ,− Park et al reported formation of massive supra-QDs of CdS, CdSe, CdTe, and CdSeTe using TOP solutions of the corresponding chalcogenides . In their study, spherical NCs are made through self-assembly of small zinc blend spherical QDs .…”

Section: Introductionmentioning

confidence: 99%

“…In their study, spherical NCs are made through self-assembly of small zinc blend spherical QDs . Previously, we showed formation of hyperbranched Mn 2+ : ZnSeS NCs using Me 2 S 2 and Ph 2 Se 2 as precursors via a hot-injection method . Hyperbranched nanostructures formed from oriented attachment of zinc blend spherical NCs and changing the ratio of dichalcogenides affects the size of the initial NCs.…”

Section: Introductionmentioning

confidence: 99%

“…Hyperbranched nanostructures formed from oriented attachment of zinc blend spherical NCs and changing the ratio of dichalcogenides affects the size of the initial NCs. Unlike tetrapod structures in which the arms have wurtzite structure, ,− the branched structures retained zinc blend structure after formation of the arms …”

Section: Introductionmentioning

confidence: 99%

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Microwave-Assisted Synthesis and Assembly of Hyperbranched Supra Quantum Dot CdE (E = S, Se, Te) Nanocrystals

Yazdanparast

McLaurin

2019

Crystal Growth & Design

Self Cite

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Dichalcogenides are alternatives for synthesis of nanometal chalcogenides, which provides a variety of precursors with different reactivities. Using disulfide, diselenide, and ditelluride and their mixtures, metal chalcogenide nanocrystals (NCs) in which structures vary from spherical NCs with diameters of ∼4 nm to large, hyperbranched NCs with diameters approaching 200 nm are synthesized. Study of the effects of the reaction temperature, concentration and ratio of reactants shows that hyperbranched supra quantum dots (HSQDs) form in three steps: nucleation, aggregation, and kinetically controlled growth. By tuning the concentration of precursors and reaction temperature, both aggregation and growth can be modulated and tetrapod NCs with arms of tunable length and thickness can be prepared. The more reactive precursor forms small NCs, which work as a platform for formation of the arms from the less reactive precursor, providing controlled growth on the more reactive facets. By controlling the precursor ratio, the composition of the HSQDs can be controlled.

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Manganese-Doped One-Dimensional Organic Lead Bromide Perovskites with Bright White Emissions

Zhou

Tian²,

Khabou³

et al. 2017

ACS Appl. Mater. Interfaces

108

111

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Single-component white-emitting phosphors are highly promising to simplify the fabrication of optically pumped white light-emitting diodes. To achieve white emission, precise control of the excited state dynamics is required for a single-component system to generate emissions with different energies in the steady state. Here, we report a new class of white phosphors based on manganese (Mn)-doped one-dimensional (1D) organic lead bromide perovskites. The bright white emission is the combination of broadband blue emission from the self-trapped excited states of the 1D perovskites and red emission from the doped Mn ions. Because of the indirect nature of the self-trapped excited states in 1D perovskites, there is no energy transfer from these states to the Mn ions, resulting in an efficient dual emission. As compared to the pristine 1D perovskites with bluish-white emission, these Mn-doped 1D perovskites exhibit much higher color rendering index of up to 87 and photoluminescence quantum efficiency of up to 28%.

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Single-step synthesis of hyperbranched, luminescent Mn²⁺-doped ZnSe_1−xS_x nanocrystals using dichalcogenide precursors

Cited by 6 publications

References 57 publications

Mn2+-ZnSe/ZnS@SiO2 Nanoparticles for Turn-on Luminescence Thiol Detection

Mn2+-ZnSe/ZnS@SiO2 Nanoparticles for Turn-on Luminescence Thiol Detection

Microwave-Assisted Synthesis and Assembly of Hyperbranched Supra Quantum Dot CdE (E = S, Se, Te) Nanocrystals

Manganese-Doped One-Dimensional Organic Lead Bromide Perovskites with Bright White Emissions

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