Search results for "wires"
showing 4 items of 174 documents
Optical Properties of III-V Nanowires and Their Application for Charge Transport and Single-Photon Emission
2012
This work covers the optical characterization of III-V semiconductor nanowires and their application for charge transport and for single-photon emission. InAs nanowires have been investigated by Raman scattering and PL spectroscopy. The possibility to grow nanowires with a crystal structure different from its bulk counterpart has aroused a lot of interest in their optical and electronic properties. Here, the optical phonon modes of wurtzite InAs nanowires have been studied by polarized Raman scattering. For the first time, Raman measurements on a single InAs nanowire have revealed the A1(TO) and E2h optical phonon modes of the wurtzite structure. Additional resonant Raman scattering experim…
PEDOT saturošu nanošķiedru iegūšana, izmantojot elektrovērpšanas metodi, un to elektrisko īpašību raksturošana
2020
Šajā darbā ir veikti pētījumi ar PEDOT:PSS polimēra nanodiegiem un plānajām kārtiņām. Nanodiegi tika iegūti izmantojot elektrovērpšanas metodi. Tika pētītas iegūto paraugu īpašības – elektriskā vadītspēja un Zēbeka koeficients, kā arī nanodiegu dimensionālie lielumi. Šī pētījuma mērķis ir iegūt nanodiegus ar pēc iespējas augstāku elektrisko vadītspēju. Tas tiek panākts palielinot PEDOT:PSS polimēra koncentrāciju šķīdumos, pārbaudot arī šķīdumu, kurā nav pievienots PEDOT:PSS polimērs. Ir izmērītas īpatnējās elektriskās vadītspējas un Zēbeka koeficienti nanodiegu un plāno kārtiņu paraugiem. Iegūtās vadītspējas un Zēbeka koeficienti ir salīdzināti savā starpā, lai saprastu elektrovērpšanas pro…
High-Performance Lead-Acid Batteries Enabled by Pb and PbO2 Nanostructured Electrodes: Effect of Operating Temperature
2021
Lead-acid batteries are now widely used for energy storage, as result of an established and reliable technology. In the last decade, several studies have been carried out to improve the performance of this type of batteries, with the main objective to replace the conventional plates with innovative electrodes with improved stability, increased capacity and a larger active surface. Such studies ultimately aim to improve the kinetics of electrochemical conversion reactions at the electrode-solution interface and to guarantee a good electrical continuity during the repeated charge/discharge cycles. To achieve these objectives, our contribution focuses on the employment of nanostructured electr…
The resonant state at filling factor {\nu} = 1/2 in chiral fermionic ladders
2017
Helical liquids have been experimentally detected in both nanowires and ultracold atomic chains as the result of strong spin-orbit interactions. In both cases the inner degrees of freedom can be considered as an additional space dimension, providing an interpretation of these systems as synthetic ladders, with artificial magnetic fluxes determined by the spin-orbit terms. In this work, we characterize the helical state which appears at filling $\nu=1/2$: this state is generated by a gap arising in the spin sector of the corresponding Luttinger liquid and it can be interpreted as the one-dimensional (1D) limit of a fractional quantum Hall state of bosonic pairs of fermions. We study its main…