Search results for "nanotekniikka"

Numerical simulation of low temperature thermal conductance of corrugated nanofibers

2010

Challenges in Nanoscience Education

2020

Intelligent papers

2006

Elongation and plasmonic activity of embedded metal nanoparticles following heavy ion irradiation

2023

Shape modification of embedded nanoparticles by swift heavy ion (SHI) irradiation is an effective way to produce nanostructures with controlled size, shape, and orientation. In this study, randomly oriented gold nanorods embedded in SiO2 are shown to re-orient along the ion beam direction. The degree of orientation depends on the irradiation conditions and the nanorod's initial size. SHI irradiation was also applied to modify spherical metallic nanoparticles embedded in Al2O3. The results showed that they elongate due to the irradiation comparably to those embedded in SiO2. Metallic nanostructures embedded in dielectric matrices can exhibit localized surface plasmon (LSP) modes. The elongat…

Conductivity measurements of DNA TX tile and origami structures

2011

Tässä tutkielmassa on tutkittu kahden erilaisen itsejärjestyvän DNA-rakenteen sähkönjohtavuutta nanomittakaavassa. Ensimmäinen rakenteista on suorakaiteenmuotoinen kaksiulotteinen DNA-levy kooltaan noin 70×100 nm2 toisen ollessa selvästi kapeampi, noin 10×60 nm2. Suurin ero rakenteiden välillä on valmistusmenetelmä: isompi rakenne on valmistettu origamitekniikalla ja pienempi niin sanottua tiilimenetelmää käyttäen. Molekyylielektroniikan kannalta DNA:n sähkönjohtavuus on oleellinen asia, sillä DNA on itsejärjestäytymisominaisuuksiensa vuoksi osoittautunut hyvin lupaavaksi molekyyliksi: yksinkertaisten nanoskaalan laitteiden valmistus käyttäen DNA-pohjaisia menetelmiä on jo mahdollista. Työs…

Toward Quaternary QCA : Novel Majority and XOR Fuzzy Gates

2022

As an emerging nanotechnology, quantum-dot cellular automata (QCA) has been considered an alternative to CMOS technology that suffers from problems such as leakage current. Moreover, QCA is suitable for multi-valued logic due to the simplicity of implementing fuzzy logic in a way much easier than CMOS technology. In this paper, a quaternary cell is proposed with two isolated layers because of requiring three particles to design this quaternary cell. Moreover, due to the instability of the basic gates, the three particles cannot be placed in one layer. The first layer of the proposed two-layer cell includes a ternary cell and the second one includes a binary cell. It is assumed that the over…

Nanotieteen ja -teknologian hyödyntäminen ääreishermostollisessa ylemmän raajan neuroprostetiikassa

2017

Tämä kirjallisuuskatsaus pyrkii luomaan realistisen kuvan tämän hetkisestä neuroprostetiikan alasta ja sen tulevaisuudesta, perehtymään alan ongelmiin, luomaan yhteyden nanoteknologian ja neuroprostetiikan välille ja miettimään miten ja mitä neuroprostetiikan ongelmia voitaisiin ratkaista nanoteknologialla. Suurin ongelma intuitiivisen hallinnan ja sitä kautta luonnollisen tuntuisen keinotekoisen käden saavuttamiseksi on ihmisen ja proteesin välisen yhteyden rajapinta. Nykyiset elektrodit, joilla yhteys muodostetaan ovat hermoston rakenteeseen suhteutettuna suuria ja todellisuudessa epäspesifejä. Nanoteknologian avulla käytettävien elektrodien kokoa voitaisiin pienentää,…

Models for quantum dots and rings

2003

Superconducting tunnel junction fabrication on three-dimensional topography based on direct laser writing

2020

Superconducting junctions are widely used in a multitude of applications ranging from quantum information science and sensing to solidstate cooling. Traditionally, such devices must be fabricated on flat substrates using standard lithographic techniques. In this study, we demonstrate a highly versatile method that allows for superconducting junctions to be fabricated on a more complex topography. It is based on maskless direct laser writing and two-photon lithography, which allows writing in 3D space. We show that high-quality normal metal–insulator–superconductor tunnel junctions can be fabricated on top of a 20-lm-tall three-dimensional topography. Combined with conformal resist coating m…

Superconducting Triplet Rim Currents in a Spin-Textured Ferromagnetic Disk

2022

Since the discovery of the long-range superconducting proximity effect, the interaction between spin-Triplet Cooper pairs and magnetic structures such as domain walls and vortices has been the subject of intense theoretical discussions, while the relevant experiments remain scarce. We have developed nanostructured Josephson junctions with highly controllable spin texture, based on a disk-shaped Nb/Co bilayer. Here, the vortex magnetization of Co and the Cooper pairs of Nb conspire to induce long-range triplet (LRT) superconductivity in the ferromagnet. Surprisingly, the LRT correlations emerge in highly localized (sub-80 nm) channels at the rim of the ferromagnet, despite its trivial band s…