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A Safer, Easier, Faster Synthesis for CdSe Quantum Dot Nanocrystals
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Properties that vary with particle size are an important feature of nanoscale materials. CdSe quantum dot nanocrystals vary in color from green–yellow to orange–red and luminesce from blue to yellow, where shorter wavelength, higher energy, electronic transitions correspond to smaller particle sizes. CdSe quantum dot nanocrystals are a visually engaging way to demonstrate quantum effects in chemistry, since their transition energies can be explained as a "particle in a box", where a delocalized electron is the particle and the nanocrystal is the box. Following the method pioneered by Xiaogang Peng and coworkers, CdSe nanocrystals are synthesized from CdO, oleic acid, elemental Se, and trioctylphosphine using a kinetic growth method in octadecene at 225 °C and a less than three-minute reaction time. This synthesis has several advantages over methods using dimethyl cadmium, a chemical that is extremely toxic, expensive, unstable, pyrophoric, and requires inert atmosphere techniques. When excited at 400 nm, the colloidal suspensions of quantum dots give relatively sharp emission spectra with 
35-nm peak widths, indicating monodisperse particle sizes. Corresponding absorbance spectra are also of high quality.
Keywords:
Upper-Division UndergraduateKeywords:
Inorganic ChemistryKeywords:
Hands-On Learning / ManipulativesKeywords:
ColloidsCiting Articles
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- Received: August 03, 2009
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