TECHNOLOGY
What are nanocrystals?
What are dendron ligands?
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RESEARCH
Most nanotechnology commercialization involves colloidal nanocrystals. Colloidal nanocrystals have unique chemical and
physical properties that could be utilized in many applications. Some pioneers expect to incorporate these nanoscale
building blocks into products such as optical transistors, electronics and drug delivery systems to take advantage of the
nanomaterials' high surface-to-volume ratio, size, sensitivity and other attributes. For instance, some futurists predict
that machines could be built that position atoms into perfectly assembled products, leaving no pollution or waste. Others
forecast that nanoscale robots could scour cells and eliminate signs of disease.
The limiting factor in the growth of this new technology is the availability of high-quality materials
with desirable properties. NN-Labs is providing a wide range of high-quality and inexpensive nanocrystals with ideal ligand
peripheries with more to come in the near future.
The comparison of emission peaks from an Organic Light Emitting Diode (OLED) with a Light Emitting Diode made with nanocrystals (NanoLED).
Related research
Staying on the cutting edge of research and technology
1. "Efficient, Stable, Small, and
Water-Soluble Doped ZnSe Nanocrystal Emitters as Non-Cadmium Biomedical Labels." N. Pradhan, D. Battaglia, Y. Liu, X. Peng, Nano Lett., 2007, vol 7, no 2, p 312.
2. "An Alternative of CdSe Nanocrystal Emitters: Pure and Tunable Impurity
Emissions in ZnSe Nanocrystals." N. Pradhan, D. Goorskey, J. Thessing, X. Peng, J. Am. Chem. Soc., 2005, vol 127, p 17586.
3. "Super-Stable, High-Quality Fe3O4 Dendron-Nanocrystals Dispersible in Both Organic and Aqueous Solutions." M. Kim, Y. Chen, Y. Liu, X. Peng, Adv. Mater., 2005, vol 7, p 1429.
4. "Size-Dependent Dissociation pH of Thiolate Ligands from Cadmium Chalcogenide Nanocrystals." J. Aldana, N. Lavelle, Y. Wang, X. Peng, J. Am. Chem. Soc., 2005, vol 127, p 2496.
5. "Photocatalytic Activity of Gold Nanocrystals and Its Role in Determining the Stability of Surface Thiol Monolayers." J. J. Li, X. Peng, J. Nano. Scie., 2004, vol 4, p 265.
6. "Size- and Shape-Controlled Magnetic (Cr, Mn, Fe, Co, Ni) Oxide Nanocrystals via a Simple and General Approach." N. R. Jana, Y. Chen, X. Peng, Chem. Mater., 2004, vol 16, p 3931.
7. "Single-Phase and Gram-Scale Synthesis of Au and Other Noble Metal Nanocrystals." N. R. Jana, X. Peng, J. Am. Chem. Soc., 2003, vol 125, p 14280.
8. "Colloidal Two-Dimensional Systems, CdSe Quantum Shells and Wells." D. Battaglia, J. J. Li, Y. Wang, X. Peng, Angew. Chem. Int. Ed., 2003, vol 43, p 5035.
9. "Large-Scale Synthesis of Nearly Monodisperse CdSe/CdS Core/Shell Nanocrystals Using Air-Stable Reagents via Successive Ion Layer Adsorption and Reaction." J. Li, Y. A. Wang, W. Guo, J. C. Keay, T. D. Mishima, M. B. Johnson, X. Peng., J. Am. Chem. Soc., 2003, vol 125, p 12567.
10. "Green Chemical Approaches toward High Quality Semiconductor
Nanocrystals." X. Peng, Chem. Eu. J., 2002, vol 8, p 334 (invited
concept article).
11. "Formation and Stability of Size-, Shape-, and Structure-Controlled CdTe Nanocrystals: Ligand Effects on Monomers and Nanocrystals." W. W. Yu, Y. A. Wang, X. Peng, Chem. Mater., 2003, p 4300.
12. "Nanocrystal in dendron-box: a versatile solution to the chemical, photochemical, and thermal instability of colloidal nanocrystals." Comptes Rendus Chimie, 2003, p 989. (invited)
13. "Mechanisms of Shape Control and Shape Evolution of Colloidal Nanocrystals." X. Peng, Adv. Mater., 2003, vol 15, p 459. (invited)
14. "Experimental Determination of the Extinction Coefficient of CdTe, CdSe, and CdS Nanocrystal." W. Yu, L. Qu, W. Guo, X. Peng, Chem. Mater., 2003, vol 15, p 2854.
15. "Conjugation Chemistry and Bio-Applications of Semiconductor Box-Nanocrystals Prepared via Dendrimer-Bridging." W. Guo, J. Li, Y. A. Wang, X. Peng, Chem. Mater., 2003, vol 15, p 3125.
16. "Formation of High Quality CdS and Other II-VI Semiconductor
Nanocrystals in Non-Coordinating Solvent, Tunable Reactivity of
Monomers." Yu W., Peng X., Angew. Chem. Int. Ed., 2002, vol 41, p 2368.
(Announced as a "hot paper" by the journal)
17. "Nearly Monodisperse and Shape-Controlled CdSe Nanocrystals via
Alternative Routes: Nucleation and Growth." Z. Peng, X. Peng, J. Am.
Chem. Soc., 2002, vol 124, p 3343.
18. “Stabilization of Inorganic Nanocrystals by Organic Dendrons.”
Y.A. Wang, J.J. Li, H. Chen, X. Peng, J. Am. Chem. Soc., 2002, vol 124,
2293-2298.
19. “Luminescent CdSe/CdS Core/Shell Nanocrystals in Dendron Boxes:
Superior Chemical, Photochemical and Thermal Stability.” W. Guo, J.J. Li,
Y.J. Wang, X. Peng,J. Am. Chem. Soc., 2003, vol 1253901-3909.
20. “Formation of High-Quality CdTe, CdSe, and CdS Nanocrystals Using CdO as Precursor.” Peng Z. A., Peng X., J. Am. Chem. Soc., 2001, vol 123, p 183. (highlighted in C&En News)
21. “Photochemical Instability of CdSe Nanocrystals Coated by Hydrophilic Thiols.” J. Aldana, Y.A. Wang, X. Peng, J. Am. Chem. Soc., 2001, 123, p 8844.
22. “Alternative Routes toward High Quality CdSe Nanocrystals.” L. Qu, Z.A. Peng, X. Peng, Nano Lett., 2001, vol 1, p 333.
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APPLICATIONS
Bio-Medical
Semiconductor nanocrystals have numerous possibilities for biomedical applications.
FOR EXAMPLE:
♦Enabling Media for Wound Repair
♦ Organic Structure Detection and Sequencing
♦ Biolabeling Agents
♦ Internal Drug Delivery
At this point, the possibilities are endless!
Display Devices
Semiconductor nanocrystals could provide superior brightness and color for:
♦ LED Lights (see picture)
♦ LED Displays for Computers, Cameras, Phones, and Much Much More!
Energy Generation
Nanocrystals could be the next generation of photovoltaics. Two major problems currently plague solar cells, low specific power efficiency and high cost. Nano-engineered solar cells could solve these two issues simultaneously.
General Nanotechnology Links:
Get the basics of nanotechnology here:
Nanotechnology Now
A hefty glossary for a tiny subject:
Glossary
A good source for news and information:
nanotechweb.org
One of our Founder's Website
The Center for Responsible Nanotechnology
Nasa's Center for Nanotechnology
The Naval Research Laboratory's Institute of Nanoscience
National Nanotechnology initiative
Nano Investors News
NanoApex
Institute of Nanoscience
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