By Daniela Dragoman
This publication provides the achievements in bionanoelectronics in a coherent demeanour. It bargains with nanodevices utilized to biostructures, molecular cars, molecular pumps, molecular nanoactuators and digital biodevices, together with nanodevices for sensing and imaging biomolcules. The e-book describes bionanoelectronics, detection of biomolecules and pursuits quite a few organic purposes corresponding to detection and sequencing of DNA and early detection of assorted deseases and nanomedicine. additional very important themes of the ebook are biomimetics and bioinspired electronics.The booklet additionally bargains with biomolecules as construction blocks of nanodevices for nanoelectronics or destiny computing structure the applying of scanning probe options to organic samples is described.
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Extra resources for Bionanoelectronics: Bioinquiring and Bioinspired Devices
40). 42 1 Fundamentals on Bionanotechnologies Fig. 40 The dsDNA terminated with nanoparticles as electrodes STM tip gold nanoparticles dsDNA Au grain Au film Fig. 41 The energy diagram of the single DNA molecule connected to a nanoparticle STM electrodes LUMO EF HOMO m1 m2 - + The Landauer model is again used to explain the conduction mechanisms encountered in the above nanostructure. Considering that the dc voltage V is applied between the STM tip and the gold substrate, the electrochemical potential of the tip, 2 , differs by the quantity eV from the electrochemical potential of the substrate 1 : it is higher or smaller than 1 if a negative or a positive voltage V , respectively, is applied.
We can see from the above examples that there are two basic methods to connect biomolecules to metallic electrodes. One method is the top contact, as in the case of STM tip–(nanoparticle–DNA) electrodes in Fig. 40 or the DNA Schottky diode in Fig. 45. The other method consists of the nanogap electrodes, as in the case of the DNA molecule in Fig. 36 formed from 30 base pairs of poly(G)–poly(C), which displays a semiconducting behavior. Nanogap electrodes are mostly used when one or few molecules must be connected to metallic contacts.
At nanoscale, although chemical doping is still used in CNT transistors, for example, the diversity of functionalization techniques is greatly enhanced. For instance, nanowires or quantum dots can be functionalized also via electric fields, hydrogenation, oxygenation, adsorption of molecules or biomolecules, or other methods discussed throughout the book. Deposition techniques for nanosized devices are based on chemical vapor deposition (CVD), in which thin films, with thicknesses up to fractions of nm, are deposited on a substrate using chemical reactions of specific gaseous components.