problem, it is being attempted to increase the dielectric constant of a gate insulating film or to use a metal gate electrode.
The purpose of the former is to increase the physical film thickness and suppress a tunneling current by replacing a gate insulating film with a high-dielectric film.
The purpose of the latter is to prevent depletion of the gate electrode by metallizing it.
Recently, the development of the materials of high-dielectric gate insulating films is being extensively done, and new materials such as HfO2 and La2O3 are reported in learned societies. This produces the competition of decreasing the effective oxide film thickness.
On the other hand, the study of metal gate electrodes is not so extensively done as the development of high-dielectric films. However, as shown in the ITRS 2001Dendrimers for pharmaceutical and biomedical applications.
Dendrimers are a unique class of synthetic macromolecules having a highly branched, three-dimensional, nanoscale architecture with very low polydispersity and high functionality. Structural advantages allow dendrimers to play an important role in the fields of nanotechnology, pharmaceutical and medicinal chemistry. This review discusses several aspects of dendrimers, including preparation, dendrimer-drug coupling chemistry, structural models of dendrimer-based drug delivery systems, and physicochemical and toxicological properties.