Results 41 to 50 of about 99,600 (241)

Field Emission from Carbon Nanotubes on Titanium Nitride-Coated Planar and 3D-Printed Substrates

Nanomaterials
Carbon nanotubes (CNTs) are well known for their outstanding field emission (FE) performance, facilitated by their unique combination of electrical, mechanical, and thermal properties. However, if the substrate of choice is a poor conductor, the electron
Stefanie Haugg, Luis-Felipe Mochalski, Carina Hedrich, Isabel González Díaz-Palacio, Kristian Deneke, Robert Zierold, Robert H. Blick   +6 more
doaj   +1 more source

Substrate thermal properties influence ventral brightness evolution in ectotherms

Communications Biology, 2021
Jonathan Goldenberg et al. use photographic data and ancestral state reconstruction of 126 viper species to show that substrate type influences the evolution of ventral brightness for efficient heat transfer. Their results suggest that these patterns may
Jonathan Goldenberg, Liliana D’Alba, Karen Bisschop, Bram Vanthournout, Matthew D. Shawkey   +4 more
doaj   +1 more source

Temperature-Enhanced Exciton Emission from GaAs Cone–Shell Quantum Dots

Nanomaterials, 2023
The temperature-dependent intensities of the exciton (X) and biexciton (XX) peaks from single GaAs cone–shell quantum dots (QDs) are studied with micro photoluminescence (PL) at varied excitation power and QD size.
Christian Heyn, Leonardo Ranasinghe, Kristian Deneke, Ahmed Alshaikh, Robert H. Blick   +4 more
doaj   +1 more source

Piezoresistive Monitoring of Carbon Nanomaterial‐Reinforced Epoxy Composites Under Cyclic and Fatigue Loading: A Review

Advanced Engineering Materials, EarlyView.
Carbon nanomaterial‐reinforced epoxy composites exhibit pronounced piezoresistive behavior, enabling intrinsic damage sensing under cyclic and fatigue loading. This review critically compares carbon nanotube and graphene systems, correlating filler content, percolation threshold, and gauge factor with sensing stability and damage evolution.
J. M. Parente, J. Nunes‐Pereira, A. P. Silva, P. N. B. Reis   +3 more
wiley   +1 more source

Change in carbon nanofiber resistance from ambient to vacuum

AIP Advances, 2011
The electrical properties of carbon nanofibers (CNFs) can be affected by adsorbed gas species. In this study, we compare the resistance values of CNF devices in a horizontal configuration in air and under vacuum. CNFs in air are observed to possess lower
Shusaku Maeda, Patrick Wilhite, Nobuhiko Kanzaki, Toshishige Yamada, Cary Y. Yang   +4 more
doaj   +1 more source

3D‐Printed Giant Magnetoresistive (GMR) Sensors Based on Self Compliant Springs

Advanced Engineering Materials, EarlyView.
This work explores 3D‐printed GMR sensors utilizing self‐compliant spring structures and conductive PLA composites. By optimizing arm width, we achieved high piezoresistive (0.34%/mm) and magnetoresistive (0.77%/mT) sensitivities. Demonstrated through Bluetooth‐integrated pressure and magnetic position sensing, these full printed low‐cost, customizable
Josu Fernández Maestu, Nelson Pereira, Javier Vicente, Carmen Rial Tubio, Senentxu Lanceros‐Méndez   +4 more
wiley   +1 more source

Electrical Conductivities of Conductors, Semiconductors, and Their Mixtures at Elevated Temperatures

Advanced Engineering Materials, EarlyView.
This article presents a comprehensive review of temperature‐dependent electrical conductivity data for multiple material classes at elevated temperatures, highlighting a persistent conductivity gap between metals and semiconductors in the range of 102$\left(10\right)^{2}$– 107$\left(10\right)^{7}$ S/m. Metal–ceramic irregular metamaterials are proposed
Valentina Torres Nieto, Marcia A. Cooper
wiley   +1 more source

Enhanced IoT Security: Blockchain, Cryptography, and CNN Integration for Mask Detection

Journal of Electrical and Computer Engineering
Security concerns have become paramount, especially with the increasing reliance on facial recognition technology for identity verification. The use of masks, while essential for health protection, poses a significant challenge for these systems ...
Imen Hagui, Amina Msolli, Abdelhamid Helali   +2 more
doaj   +1 more source

Nanotip-based photoelectron microgun for ultrafast LEED

Structural Dynamics, 2017
We present the design and fabrication of a micrometer-scale electron gun for the implementation of ultrafast low-energy electron diffraction from surfaces.
Gero Storeck, Simon Vogelgesang, Murat Sivis, Sascha Schäfer, Claus Ropers   +4 more
doaj   +1 more source

Linear and Nonlinear Optical Absorption of CdSe/CdS Core/Shell Quantum Dots in the Presence of Donor Impurity

Atoms, 2021
Linear and nonlinear optical properties in colloidal CdSe/CdS core/shell quantum dots with different sizes have been theoretically investigated in the framework of effective mass approximation. The electron states in colloidal CdSe/CdS core/shell quantum
Grigor A. Mantashian, Nare A. Zaqaryan, Paytsar A. Mantashyan, Hayk A. Sarkisyan, Sotirios Baskoutas, David B. Hayrapetyan   +5 more
doaj   +1 more source