Ternary Nanocrystals Used as Building Blocks for Solar Cells
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Synthesis of Novel Thermoresponsive Glycopolymers Achieved through Click Chemistry Click chemistry is a relatively new synthetic approach toward the development of novel polymers with well controlled network formations. Click reactions spontaneously occur through relatively simple chemical conversions that induce irreversible bond formations between preformed polymeric building blocks. This reaction has garnered great attention toward the development of unique biomaterials by providing an efficient and extremely adaptable alternative method to traditional techniques, such as living polymerizations, to prepare existing materials classes. The most commonly utilized type of click reaction takes advantage of orthogonal directed chemistry through a copper(I)catalyzed azide–alkyne cyclo addition (CuAAC), which eliminates key reaction parameters involving functional group protection, and requires no further purification procedures. A recent development in the click strategy has emerged through
Ternary Nanocrystals Used as Building Blocks for Solar Cells Semiconductor nanocrystals have low production costs, are easy to process in solution, and have a reasonably high photoactivity. They should be, in principle, ideal candidates for photovoltaic applications. But the quantum confinement effect, which improves the nanocrystals’ optical absorption, can hinder charge transport and limit the efficiency of the photovoltaic device. This phenomenon has been observed in various binary semiconductor nanoparticles, and compositional tuning has been suggested as an alternative to overcome this problem. Ternary compositions for nanocrystals might improve the photovoltaics performance. In the March 12 issue of Nano Letters (DOI: 10.1021/ nl900388a; p. 1699), W. Ma, J.M. Luther, H. Zheng, Y. Wu, and A.P. Alivisatos from
the addition of thiols to alkenes, commonly known as a thiol-ene coupling or thiol-ene click reaction. The coupling nature, complete specificity, and ability to obtain nearly perfect quantitative yields, makes the application of this polymerization ideal when the chemical synthesis must occur in the presence of a wide variety of functional groups under physiological conditions. To further investigate the use of thiol-ene click mediated polymers in vivo, post functionalized, pre-formed, thermo-responsive polymeric micelles containing sugar moieties have been developed by G. Chen, S. Amajjahe, and M.H. Stenzel of the Center for Advanced Macromolecular Design (CAMD), The University of New South Wales, as reported in a recent issue of Chemical Communications (issue 10; DOI: 10.1039/b900215d; p. 1198). Homopolymers and block copolymers bearing carbohydrate side chain functionality were obtained by grafting unprotected glucothiose onto alkene functional scaffolds through a thiol-ene click reaction and the resulting copolymer was used to form thermo-responsive micelles
as a potential drug carrier. These novel thiol-linked glycopolymers have the potential to mimic natural glycoproteins for investigating bioprocesses or as multi
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