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Single step creates quantum dots in bulk for biomedical imaging

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Ashley N. Paddock, [email protected]

A simple one-step chemical process for turning carbon fiber into semiconducting nanocrystals could prove useful in biomedical, optical and electronic applications. "There have been several attempts to make graphene-based quantum dots with specific electronic and luminescent properties using chemical breakdown or e-beam lithography of graphene layers," said Pulickel Ajayan, a Rice University materials scientist who discovered the process in collaboration with colleagues at the Texas Medical Center and in China, India and Japan. "We thought that as these nanodomains of graphitized carbons...Read full article

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    Published: March 2012
    Glossary
    fluorescence
    Fluorescence is a type of luminescence, which is the emission of light by a substance that has absorbed light or other electromagnetic radiation. Specifically, fluorescence involves the absorption of light at one wavelength and the subsequent re-emission of light at a longer wavelength. The emitted light occurs almost instantaneously and ceases when the excitation light source is removed. Key characteristics of fluorescence include: Excitation and emission wavelengths: Fluorescent materials...
    optical
    Pertaining to optics and the phenomena of light.
    quantum dots
    A quantum dot is a nanoscale semiconductor structure, typically composed of materials like cadmium selenide or indium arsenide, that exhibits unique quantum mechanical properties. These properties arise from the confinement of electrons within the dot, leading to discrete energy levels, or "quantization" of energy, similar to the behavior of individual atoms or molecules. Quantum dots have a size on the order of a few nanometers and can emit or absorb photons (light) with precise wavelengths,...
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