Researchers synthesize silicon-based quantum dots

(Nanowerk News) NDSU researchers recently developed a new method of creating quantum dots made of silicon, one of the most utilized semiconductors in the world (ACS Nano, "Bright Silicon Nanocrystals from a Liquid Precursor: Quasi-Direct Recombination with High Quantum Yield").
Quantum dots, or nanocrystals, are tiny nanometer scale pieces of semiconductor that emit light when their electrons are exposed to ultraviolet light. The most common application of quantum dots is in QLED displays. Through their use, digital displays are brighter and much thinner, resulting in improvements to television and, potentially, cell-phone technology.
Because silicon is abundant and nontoxic, silicon quantum dots have unique technological appeal.
Silicon quantum dots are currently being used for applications such as windows that remain transparent while serving as active photovoltaic collectors of energy, and they hold promise in medicine where quantum dots are coated with organic molecules to create nontoxic fluorescent biomarkers.
While traditional methods for creating silicon quantum dots require dangerous materials such as silicon tetrahydride (silane) gas or hydrofluoric acid, the NDSU teamís research uses a liquid form of silicon to make the tiny particles at room temperature using relatively benign components.
The team, led by Erik Hobbie, professor of physics, coatings and polymeric materials, and director of NDSUís graduate program in materials and nanotechnology, relied on the discoveries of NDSU Distinguished Professor of chemistry Philip Boudjouk, who developed the liquid precursor (cyclohexasilane).
NDSU alumnus Todd Pringle was the lead researcher on the project. Pringle is the president of Lumacept Inc., a company that produces the only available coating designed to reflect germ-killing ultraviolet light, called UV-C. Lumacept is currently helping health care providers decontaminate and re-use their personal protective equipment.
ďThis approach has the potential to take the production of these materials to a new level of quality and scale,Ē Hobbie says. ďI believe this is the best work Iíve been involved with in my career and Iím very proud that it was done at NDSU.Ē
Source: North Dakota State University
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