Effects of a Lead Chloride Shell on Lead Sulfide Quantum Dots.

08:00 EDT 1st April 2019 | BioPortfolio

Summary of "Effects of a Lead Chloride Shell on Lead Sulfide Quantum Dots."

The size of a quantum-confined nanocrystal determines the energies of its excitonic transitions. Previous work has correlated the diameters of PbS nanocrystals to their excitonic absorption; however, we observe that PbS quantum dots synthesized in saturated dispersions of PbCl can deviate from the previous 1S-1S energy vs. diameter curve by 0.8 nm. In addition, their surface differs chemically from that of PbS quantum dots produced via other syntheses. We find that these nanocrystals are coated in a shell that is measurable in transmission electron micrographs and contains lead and chlorine, beyond the monoatomic chlorine termination previously proposed. This finding has implications for understanding the growth mechanism of this reaction, the linewidth of these quantum dots' photoluminescence, and electronic transport within films of these nanocrystals. Such fundamental knowledge is critical to applications of PbS quantum dots such as single-photon sources, photodetectors, solar cells, light-emitting diodes, lasers, and biological labels.


Journal Details

This article was published in the following journal.

Name: The journal of physical chemistry letters
ISSN: 1948-7185


DeepDyve research library

PubMed Articles [19965 Associated PubMed Articles listed on BioPortfolio]

Room temperature photoluminescence of PbS quantum dots: Capping agent and thermal effect.

The most efficient method for obtaining high concentration, monodispersed quantum dots is the sol gel method. This manuscript reports room temperature photoluminescence (PL) of lead sulfide (PbS) quan...

Optical Characteristics of ZnS Passivated CdSe/CdS Quantum Dots for High Photostability and Lasing.

Nanocrystal quantum dots (QDs) have great potential for optoelectronic applications such as light emitting diodes and lasers due to their superior optical properties. The core-shell CdSe/CdS QDs can s...

Triple-Labelling of Polymer-Coated Quantum Dots and Adsorbed Proteins for Tracing their Fate in Cell Cultures.

Colloidal CdSe/ZnS quantum dots were water-solubilized by overcoating with an amphiphilic polymer. Human serum albumin (HSA) as model protein was either adsorbed or chemically linked to the surface of...

Critical role of metal ions in surface engineering toward brightly luminescent and stable cesium lead bromide perovskite quantum dots.

The highly dynamic binding ligands on the surface of all-inorganic cesium lead halide perovskite quantum dots (PQDs), which can be easily lost or detached leading to a deterioration in the optical pro...

Highly Oxidized Graphene Quantum Dots from Coal as Efficient Antioxidants.

Graphene quantum dots (GQDs) have recently been employed in various fields including medicine as antioxidants, primarily due to favorable biocompatibility in comparison to common inorganic quantum dot...

Clinical Trials [5611 Associated Clinical Trials listed on BioPortfolio]

Exposure, Dose, Body Burden and Health Effects of Lead

This is a study of the effects that lead has on the health of the central nervous system (for example, memory), peripheral nervous system (for example, sensation and strength in the hands ...

A Randomized Trial of DOTS Versus Enhanced DOTS for Community Control of Tuberculosis

This study will test the effectiveness of two different tuberculosis (TB) prevention strategies, DOTS or DOTS-A. DOTS is the current prevention strategy for TB. DOTS-A is an enhanced preve...

Tritanium® Primary Acetabular Shell Study

This study will be a prospective, non-randomized evaluation of the Tritanium® Primary Acetabular Shell for primary total hip replacement (THR) with a cementless application in a consecuti...

Does Lead Burden Alter Neuropsychological Development?

Inner city children are at an increased risk for lead overburden. This in turn affects cognitive functioning. However, the underlying neuropsychological effects of lead overburden and it...

Model 4296 Left Ventricular (LV) Lead Study

This study is designed to show that a new lead, which paces the left bottom chamber (left ventricle) of the heart, is safe. Using a lead on the left side of the heart has been shown to pot...

Medical and Biotech [MESH] Definitions

Nanometer sized fragments (the dots) of semiconductor crystalline material which emit PHOTONS. The wavelength is based on the quantum confinement size of the dot. They are brighter and more persistent than organic chemical INDICATORS. They can be embedded in MICROBEADS for high throughput ANALYTICAL CHEMISTRY.

Injury to the nervous system secondary to exposure to lead compounds. Two distinct clinical patterns occur in children (LEAD POISONING, NERVOUS SYSTEM, CHILDHOOD) and adults (LEAD POISONING, NERVOUS SYSTEM, ADULT). In children, lead poisoning typically produces an encephalopathy. In adults, exposure to toxic levels of lead is associated with a peripheral neuropathy.

Poisoning that results from chronic or acute ingestion, injection, inhalation, or skin absorption of LEAD or lead compounds.

Unstable isotopes of lead that decay or disintegrate emitting radiation. Pb atoms with atomic weights 194-203, 205, and 209-214 are radioactive lead isotopes.

Neurologic disorders occurring in children following lead exposure. The most frequent manifestation of childhood lead toxicity is an encephalopathy associated with chronic ingestion of lead that usually presents between the ages of 1 and 3 years. Clinical manifestations include behavioral changes followed by lethargy; CONVULSIONS; HALLUCINATIONS; DELIRIUM; ATAXIA; and vomiting. Elevated intracranial pressure (HYPERTENSION, INTRACRANIAL) and CEREBRAL EDEMA may occur. (From Adams et al., Principles of Neurology, 6th ed, p1210-2)

Quick Search


DeepDyve research library

Relevant Topic

Biological Therapy
Biological therapy involves the use of living organisms, substances derived from living organisms, or laboratory-produced versions of such substances to treat disease. Some biological therapies for cancer use vaccines or bacteria to stimulate the body&rs...

Searches Linking to this Article