The electronic properties of random networks of single-walled carbon nanotubes (SWCNTs) are probed by 1/f noise characteristics in a frequency range of up to 109 kHz as a function of bias voltages and the number of nanotubes deposited between asymmetrical-work function metal electrodes. The measured current-voltage characteristics of the devices exhibit rectifying and ohmic behaviour revealing...
Free-standing reduced graphene oxide (rGO) has been gaining popularity for its use in supercapacitors and battery applications due its facile synthesis, multi-layered structure, and high-current carrying capacity. Pertinent to the successful implementation of such applications, however, is the need to develop a thorough understanding of the electrical properties of such materials when subject...
Mesoscopic conductance fluctuations are a ubiquitous signature of phase-coherent transport in small conductors, exhibiting universal character independent of system details. In this work, however, we demonstrate a pronounced breakdown of this universality, due to the interplay of local and remote phenomena in transport. Our experiments are performed in a graphene-based interaction-detection...
Nowadays, clean and sustainable energy with flexible energy storage devices has gained more attention. Therefore, among various energy storage systems, flexible supercapacitors (SCs) are standing out due to their high capacity, high power density, high flexibility, and long cyclic lifetime. In this work, the electrochemical performances of carbon nanofibers decorated by TiO2 hollow...
Pretreatment processes including physical polishing (PP), wet-chemical polishing (WP), and thermal annealing for smoothing a surface of copper (Cu) foil were optimized for high-quality graphene growth. In this work, the cu foil with a small thickness of 25 µm has been used as a substrate. Preliminarily, a substrate surface was smoothed by the PP process using Brasso as a polishing substance....
In this work, the dielectric and non-Ohmic properties of $Ca_2 Cu_2-x Ge_x Ti_4 O_12$ ($CaCu_3Ti_4O_12$/$CaTiO_3$ composite) ceramic with additions of $GeO_2$ (x = 0, 0.025, 0.050 and 0.100) were prepared using a solidstate reaction method. X-ray diffraction technique was used to confirm the second phases of CaCu3Ti4O12 and CaTiO3 phases was detected in all the ceramics. The slight decrease...
Vanadium dioxide (VO2) is a material which has a special characteristic that can change its properties drastically called metal-Insulator transition (MIT). The MIT of VO2 occurs at temperature about 68๐C under atmospheric pressure which change its phase from monoclinic to rutile phase, result in their different properties and structure. This characteristic of VO2 can be used for application...
