Role of Organosulfur Compounds in the Growth and Final Surface Chemistry of PbS Quantum Dots

McPhail, Martin R.; Weiss, Emily A.

doi:10.1021/cm4040819

Cited by 22 publications

(25 citation statements)

References 40 publications

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“…53 Therefore, as-proposed cross-linking of discrete QDs by sulfur molecules approach could also massively remove the bulky surfactant and enable the generation of nearly bare QD surface. 54,55 Notably, DNA-like double helix macromolecular structure is observed as shown in Fig. 2e which may generate from the side-to-side contact between the QCs to effectively decreases the interfacial energy.…”

Section: Resultsmentioning

confidence: 99%

Chemically encoded self-organized quantum chain supracrystals with exceptional charge and ion transport properties

et al. 2019

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Artificially grown superstructures from small building blocks is an intriguing subject in 'bottom-up' molecular science and nanotechnology. Although discrete nanoparticles with different morphologies and physicochemical properties are readily produced, assembly them into higher-order structure amenable to practical applications is still a considerable challenge. This report introduces a stepwise heterogeneous approach for coupling colloidal quantum dots (QDs) synthesis with self-organization to directly generate quantum chains (QCs). By using vulcanized sulfur precursors, QDs are interdigitated into microscale chainlike supracrystals associated with oleylamine and oleic acid as structure directing agents. The cooperative nature of the QD growth and assembly have been extended to fabricate binary (PbS) and ternary metal

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Section: Resultsmentioning

confidence: 99%

Chemically encoded self-organized quantum chain supracrystals with exceptional charge and ion transport properties

et al. 2019

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“…One of the more puzzling aspects of the interaction of thiols with this type of NC is that luminescence enhancement occurs at all. Many other chalcogenide NCs (ZnSe, CdSe, and derivatives of these) lose luminescence with thiol, and the mechanism of these alternative pathways continues to be elusive [ 50 , 51 , 57 , 59 , 60 ]. Other effects due to cooperative thiol interactions or the changing NCs with increasing thiol may also be in play [ 61 ].…”

Section: Resultsmentioning

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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“…However, (TMS) 2 S and (TMS) 2 Se are flammable and toxic, and they readily hydrolyze with water to form toxic H 2 S and H 2 Se. This has led to the development of methods based on alternative precursors, including lead(II) chloride instead of PbO as the lead precursor to improve the surface passivation of the resulting CQDs [68,72], and elemental sulfur instead of (TMS) 2 S [73,74]. Additional novel growth methods have been proposed, including the synthesis of PbSe in a phosphate glass host [75].…”

Section: Synthesis Methodsmentioning

confidence: 99%

Advancing colloidal quantum dot photovoltaic technology

et al. 2016

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Colloidal quantum dots (CQDs) are attractive materials for solar cells due to their low cost, ease of fabrication and spectral tunability. Progress in CQD photovoltaic technology over the past decade has resulted in power conversion efficiencies approaching 10%. In this review, we give an overview of this progress, and discuss limiting mechanisms and paths for future improvement in CQD solar cell technology. We briefly summarize nanoparticle synthesis and film processing methods and evaluate the optoelectronic properties of CQD films, including the crucial role that surface ligands play in materials performance. We give an overview of device architecture engineering in CQD solar cells. The compromise between carrier extraction and photon absorption in CQD photovoltaics is analyzed along with different strategies for overcoming this trade-off. We then focus on recent advances in absorption enhancement through innovative device design and the use of nanophotonics. Several light-trapping schemes, which have resulted in large increases in cell photocurrent, are described in detail. In particular, integrating plasmonic elements into CQD devices has emerged as a promising approach to enhance photon absorption through both near-field coupling and far-field scattering effects. We also discuss strategies for overcoming the single junction efficiency limits in CQD solar cells, including tandem architectures, multiple exciton generation and hybrid materials schemes. Finally, we offer a perspective on future directions for the field and the most promising paths for achieving higher device efficiencies.

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Role of Organosulfur Compounds in the Growth and Final Surface Chemistry of PbS Quantum Dots

Cited by 22 publications

References 40 publications

Chemically encoded self-organized quantum chain supracrystals with exceptional charge and ion transport properties

Chemically encoded self-organized quantum chain supracrystals with exceptional charge and ion transport properties

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

Advancing colloidal quantum dot photovoltaic technology

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