Nanocrystallites

Empedocles S A, Norris D J and Bawendi M G 1996 Photoluminescence spectroscopy of single CdSe nanocrystallite quantum dots Phys. Rev. Lett. 77 3873-6... 

The magnetism of nanocrystallites contained in graphitic cages is intriguing, not only for scientific research, but also for applications such as magnetic fluids, magnetic ink, and so on. 

Trindade, T. O Brien P. and Zhang, X. (1997). Synthesis of CdS and CdSe Nanocrystallites using a novel single-molecule precursor approach. Chem. Mater., 9, 523-530. 

Trindade, T. and O Brien, P. (1996). A single source approach to the synthesis of CdSe nanocrystallites. Adv. Mater., 8,161-163. 

Zinc sulfide, ZnS, has been epitaxially deposited by the dual bath approach on Au(lll) surface and studied by STM and XPS [48]. The first complete ECALE cycle resulted in the formation of nanocrystallites of ZnS randomly distributed across Au(l 11) terraces, on account of lattice mismatch induced strain between ZnS and Au(lll) - although the mismatch is only 0.13% for ZnS/Au(lll). Atomically resolved STM images showed the ZnS/Au(lll) monolayer to be sixfold symmetric. The average diameter of the crystallites was 10 5 nm and the apparent coverage 0.38. 

Electrogenerated chemiluminescence (ECL) has proved to be useful for analytical applications including organic analysis, ECL-based immunosensors, DNA probe assays, and enzymatic biosensors. In the last few years, the electrochemistry and ECL of compound semiconductor nanocrystallites have attracted much attention due to their potential applications in analytical chemistry (ECL sensors). 

Dabbousi, B. O., Rodriguez-Viejo, J., Mikulec, F. V, Heine, J. R., Mattoussi, H., Ober, R., Jensen, K. F. and Bawendi, M. G. (1997) (CdSe)ZnS core-shell quantum dots synthesis and characterization of a size series of highly luminescent nanocrystallites. J. Phys. Chem. B, 101, 9463-9475. 

Empedocles, S. A. and Bawendi, M. G. (1997) Quantum-confined stark effect in single CdSe nanocrystallite quantum dots. Science, 278, 2114-2117. 

Zoval JV, Lee J, Gorer S, Penner RM. 1998. Electrochemical preparation of platinum nanocrystallites with size selectivity on basal plane oriented graphite surfaces. J Phys Chem B 102 1166-1175. 

Unusual nanostructures with different shapes of mercury oxide have been synthesised by the direct ultrasonic method [29]. Influence of different factors on the size, morphology and crystallinity of HgO nanocrystallites has been reported. The effect of ultrasound on the size and morphology of the nanoparticles has been confirmed... 

Xiao Q, Si Z, Zhang J, Xiao C, Yu Z, Qiu G (2007) Effects of samarium dopant on photocatalytic activity of Ti02 nanocrystallite for methylene blue degradation. J Mater Sci 42 9194-9199... 

Murray, C.B., Norris, D.J. and Bawendi, M.G. (1993) Synthesis and characterization of nearly monodisperse CdE (E = sulfur, selenium, tellurium) semiconductor nanocrystallites. Journal of the American Chemical Society, 115 (19), 8706-8715. 

Hyeon, T., Lee, S.S., Park, J., Chung, Y. and Bin Na, H. (2001) Synthesis of highly crystalline and monodisperse maghemite nanocrystallites without a size-selection process. Journal of the American Chemical Society, 123 (51), 12798-12801. 

Liu, C., Zou, B.S., Rondinone, A.J. and Zhang, Z.J. (2000) Reverse micelle synthesis and characterization of superparamagnetic MnFe204 spinel ferrite nanocrystallites. Journal of Physical Chemistry B, 104 (6), 1141-1145. 

Particle size and the method of nanoparticle preparation (including the capping agent used) determine the physical and electronic properties of the quantum dots produced. This gives chemists the unique ability to change the electronic and chemical properties of a semiconductor material by simply controlling particle size and preparative conditions employed. There are various methods for the preparation of nanoparticles however, not all methods work well for the preparation of compound semiconductor nanocrystallites. 

Many synthetic methods for the preparation of nanodispersed material have been reported, several routes applying conventional colloidal chemistry, with others involving the kinetically controlled precipitation of nanocrystallites using organometallic compounds.3 6-343 Controlled precipitation reactions yield dilute suspensions of quasi-monodispersed particles. This synthetic method sometimes involves the use of seeds of very small particles for the subsequent growth of larger ones.359 360... 

Murray, C. B. Kagan, C. R. Bawendi, M. G. 1995. Self-organization of CdSe nanocrystallites into three-dimensional quantum dot superlattices. Science 270 1335-1338. 

I. Bedjat, P.V. Kamat, Capped semiconductor colloids. Synthesis and photo-electrochemical behavior of Ti02-capped SnC>2 nanocrystallites, J. Phys. Chem. 99 (1995) 9182-9188. 

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