The effect of nitrogen incorporation on the dielectric properties and bias temperature instability characteristics of HfOxNy and ZrOxNy were investigated. The incorporated nitrogen induces a reduction in the capacitan...
The effect of nitrogen incorporation on the dielectric properties and bias temperature instability characteristics of HfOxNy and ZrOxNy were investigated. The incorporated nitrogen induces a reduction in the capacitance equivalent oxide thickness value, increases the leakage current, and causes the turn around of Vth shift under the positive bias stress in nMOSFET. In addition, compared to HfOxNy, ZrOxNy shows a significantly lower initial Vth shift under positive gate stress due to the lower number of shallow bulk traps related to oxygen vacancies.
Novel core-shell structured nanoassemblies are assembled by a ßl-cyclodextrin containing a positively charged host polymer and a hydrophobic guest polymer. The hydrophobic core of these types of assemblies serves...
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In ionomeric polymers, the accumulation or depletion of excess charges (ions) at the electrodes under an applied voltage will generate strain in these regions. This can be made use of for electromechanical transductio...
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ISBN:
(纸本)9781424478705
In ionomeric polymers, the accumulation or depletion of excess charges (ions) at the electrodes under an applied voltage will generate strain in these regions. This can be made use of for electromechanical transduction devices such as actuators and sensors[1]. Figure 1 illustrates schematically an ionomeric polymer bending actuator in which the accumulation and depletion of cations at the cathode and anode, respectively, create bending of the ionomeric polymer sheet under an applied voltage. In order to increase the charge density and population at the electrodes so that a large strain and high force output can be realized, various ionomeric polymer/conductive network composites (CNC) electrodes (analogous to the porous electrodes in the supercapacitors) have been developed to form ionomeric polymer/CNC actuators (lPCNC) in the past 15 years[2-3]. A schematic of a typical bending actuator thus developed is shown in Figure 2, which in general has a three layer structure, i.e., two porous electrode layers in the form of the conductive network/ionomer composite separated by a neat ionomer layer. IPCNC actuators are attractive because it can be operated under a few volts. On the other hand, IPCNC actuators suffer a low actuation speed which is often in tens of seconds range, low efficiency (
Complex phase transformation between the hexagonal cylinder (Hex) and double gyroid (G) phases in a polystyrene-block-poly(ethylene oxide) (PS-b-PEO) diblock copolymer was investigated using two-dimensional (2D) synch...
Complex phase transformation between the hexagonal cylinder (Hex) and double gyroid (G) phases in a polystyrene-block-poly(ethylene oxide) (PS-b-PEO) diblock copolymer was investigated using two-dimensional (2D) synchrotron small-angle X-ray scattering (SAXS), and transmission electron microscope (TEM). The PS-b-PEO sample contained a small population of another bicontinuous cubic phase having an Im3m symmetry. These two bicontinuous cubic phases (G and Im3m) had the same unit cell dimensions. Under a large-amplitude reciprocating shear, the bicontinuous cubic phases transformed into a “single-crystal”-like Hex phase. When annealed at 150 °C for 40 min, the Hex phase partially transformed into well-oriented twinned structures of the G and Im3m phases without significant loss of orientation in 2D SAXS measurements. Epitaxial phase transformation relationships between the Hex/G and Hex/ Im3m phases were identified. The mechanism of the Hex → G transformation was examined by TEM.
Designing magnetic shape memory materials with practicable engineering applications requires a thorough understanding of their electronic, magnetic, and mechanical properties. Experimental and computational studies on...
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We review the results of our experimental and theoretical investigation of the thermal conductivity of the single-layer graphene. Using an original non-contact optical technique we discovered that the thermal conducti...
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ISBN:
(纸本)9781605950150
We review the results of our experimental and theoretical investigation of the thermal conductivity of the single-layer graphene. Using an original non-contact optical technique we discovered that the thermal conductivity of suspended graphene flakes is extremely high and can exceeds that of bulk graphite and carbon nanotubes. The high values of the thermal conductivity of graphene and their dependence on the graphene flake size were explained within the framework of Klemens theory. Superior thermal properties of graphene benefit all proposed graphene device applications and may lead to new high-heat flux thermal management solutions for advanced electronics.
Tunable Ka band filters based on graded barium strontium titanate (BST) have been investigated in terms of their associated parasitics, tunability, and temperature dependence of capacitance. The simulation results sho...
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