Article
Chemistry, Multidisciplinary
Sergei Vlassov, Sven Oras, Annamarija Trausa, Tauno Tiirats, Edgars Butanovs, Boris Polyakov, Veronika Zadin, Andreas Kyritsakis
Summary: This research reports the formation of structural defects, such as nano-twins, periodic polytypes, and kinks, in covalent nanowires through exploitng a peculiar plasticity in nanosized covalent materials. Specifically, single-crystal CuO nanowires can form double kinks under external mechanical loading, which is attributed to deformation-induced twinning along the (1 over bar 10)$( {\bar{1}10} )$ plane. This reversible plastic deformation process provides new insights into plastic deformation mechanisms in covalent nanowires and offers potential for developing techniques to customize the shape of nanowires and introduce new functionalities.
Article
Multidisciplinary Sciences
Duhyuk Kwon, Bum-Kyu Kim, Yong-Joo Doh, Dong Yu, Jonghyun Song, Myung-Ho Bae
Summary: Thermoelectric measurements were used to investigate the density variation at the Fermi level of the surface states in a topological insulator nanowire under external magnetic fields and gate voltage. The observed Aharonov-Bohm oscillations in the magnetothermovoltage can be used to tune the Fermi wave number and density of states at the Fermi level. The temperature dependence of the ABO amplitudes indicated phase coherence up to T = 15 K.
Article
Materials Science, Multidisciplinary
Cai-Qin Luo, Si-Cong Zhu, Chi Xu, Shengqiang Zhou, Chi-Hang Lam, Francis Chi-Chung Ling
Summary: Using first-principle calculations, the study investigates the magnetic properties of monovacancies and Sb-related defects in ZnO material. Experimental results confirm the ferromagnetic behavior predicted by the calculations, demonstrating the importance of defects containing V-Zn, V-O, Sb-Zn, Sb-O, Sb-Zn-V-Zn, and Sb-Zn-2V(Zn) in influencing magnetic properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Metallurgy & Metallurgical Engineering
Yuxuan Liu, Yangxin Li, Qingchun Zhu, Huan Zhang, Xixi Qi, Duofei Zheng, Yunliang Li, Dezhi Zhang, Xiaoqin Zeng
Summary: The local deformation behavior and dynamic recrystallization of shock compressed Mg-1Zn alloy were investigated using EBSD and TEM. The suppression of dislocation slipping and twinning during high strain-rate deformation activated a more flexible kinking deformation, facilitating slipping and twinning within the kinks. The kink bands evolved into deformation bands with recrystallized nano-grains due to slow heat dissipation and local temperature elevation. This finding provides a new perspective on kinking-facilitated nanocrystallization in Mg alloys and other anisotropic metallic materials.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Nanoscience & Nanotechnology
Xinkai Ma, Zhuo Chen, Lei Xiao, Shifeng Luo, Wenjie Lu
Summary: In this study, the compressive deformation behavior of a beta solution treated Ti-1023 alloy was analyzed at room temperature. The results revealed that stress-induced martensitic transformation dominated the compressive deformation process, with different strain rates leading to varying work hardening rates and triggering stresses. Additionally, novel deformation mechanisms of alpha '' martensite, such as {111}(α'') twinning and kinking structure, were observed during the compression deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Electrochemistry
K. Govatsi, G. Syrrokostas, S. N. Yannopoulos, S. G. Neophytides
Summary: Undoped and aluminum-doped ZnO nanowire arrays were prepared using chemical bath deposition technique, with optimal doping concentration at 0.5 at.%. The photocurrent density was significantly increased, possibly due to the promoting effect of Al ions and photoactivation of more sites.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Jose Villafuerte, Xiaoting Zhang, Eirini Sarigiannidou, Fabrice Donatini, Odette Chaix-Pluchery, Laetitia Rapenne, Minh-Quyen Le, Lionel Petit, Julien Pernot, Vincent Consonni
Summary: Piezoelectric devices made of ZnO nanowires have attracted great interest as potential nanogenerators and sensors in the past decade. However, their characteristics are limited by the screening effect of the piezoelectric potential generated under mechanical solicitations. To address this issue, we developed the compensatory Sb doping of ZnO nanowires and achieved significant incorporation of Sb dopants.
Article
Engineering, Electrical & Electronic
Ahmed A. Aboud, Ayan Mukherjee, M. Al-Dossari, N. S. Abd EL-Gawaad, Ahmed M. Saad
Summary: We report the formation of hexagonal nano-sheets of pure and Co-doped ZnO thin films using aerosol-assisted chemical vapor deposition technique. Two phases of ZnO, Wurtzite and Zinc blende, were observed in the films by X-Ray diffraction. Scanning electron microscope images show the formation of hexagonal nano-sheets on the substrate surface. Beer's law was used to determine the band gap of the films. The performance of both films as UV detectors was investigated, with the response/decay time showing large values. Co-doping decreased the response time while increasing the decay time. The Co-doped ZnO films exhibited a minimum response time of 4s at 5V applied voltage, but had a lower gain value compared to the pure film.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Mansoor Ahmad, M. K. Ahmad, N. Nafarizal, C. F. Soon, N. M. A. N. Ismail, A. B. Suriani, A. Mohamed, M. H. Mamat
Summary: High output voltages are generated by introducing impurities to ZnO nanowires, with the highest voltage achieved through further oxidation. The study demonstrates the potential for using p-type ZnO nanowires in vertically integrated nanowire generators.
Article
Materials Science, Multidisciplinary
Jun Tatebayashi, Kazuto Nishimura, Shuhei Ichikawa, Shinya Yamada, Yoshikata Nakajima, Kazuhisa Sato, Kohei Hamaya, Yasufumi Fujiwara
Summary: This study demonstrates a heterojunction p-GaN/n-ZnO LED structure using Eu-doped ZnO as an active component, aiming to realize low-cost and environmentally-friendly red LEDs with sharp linewidth and temperature stability. An Al2O3 electron blocking layer is inserted between p-GaN and ZnO:Eu/n-ZnO to facilitate carrier injection into the ZnO:Eu active layer. The device characteristics of the LED structures show red luminescence under current injection with reversed bias voltage, originating from Eu3+ ions in the ZnO host. Detailed optical characteristics of the ZnO:Eu layer enable the identification of luminescence centers contributing to Eu luminescence under indirect excitation and collisional excitation, paving the way for understanding the Eu luminescence mechanism in ZnO:Eu and realizing high-brightness LED structures based on rare-Earth doped ZnO.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Zhaohua Wang, Mingfeng Zhi, Manzhang Xu, Chen Guo, Zhenwu Man, Zhiyong Zhang, Qiang Li, Yuanyuan Lv, Wu Zhao, Junfeng Yan, Chunxue Zhai
Summary: Sb-doped SnO2/ZnO nano-heterojunctions were prepared using a microwave hydrothermal method, and the effects of Sb-doping on the morphology and gas sensor performance of SnO2/ZnO NHs were studied in detail. The study found that Sb-doping changed the morphology of SnO2 and enhanced the gas sensor response.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Bicai Li, Zhicheng Li, Dicheng Peng, Linling Huang, Shuyan Zhang, Hong Zhang
Summary: Sb-modified ZnO ceramics exhibit negative temperature coefficient of resistivity and adjustable temperature sensitivity, with resistance changes after aging mainly attributed to grain effects.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Ceramics
Tao Liu, Ya-qin Wang, Xing-gang Liu, Hai-tao Fu, Xi-zhong An, Jing-kun Yu
Summary: Sb-doped ZnO-Co3O4 nanoparticles with excellent gas-sensing performance for n-butanol were successfully synthesized by a simple one-step solvothermal route and annealing process, exhibiting high selectivity and sensitivity. The improved sensing performance of Sb-doped ZnO-Co3O4 was attributed to electronic and chemical sensitization effects of Sb as well as the formation of shallow donor complex defects.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Rajwali Khan, Khaled Althubeiti, Zulfiqar, Amir Muhammad Afzal, Nasir Rahman, Simbarashe Fashu, Wenfei Zhang, Aurangzeb Khan, Ruisheng Zheng
Summary: In this study, various ZnO nanoparticles with different co-dopants were successfully fabricated and their room-temperature structure and magnetic properties were investigated. The increase in co-dopant concentration was found to result in larger average grain size in the samples. Co and Ce co-doping induced ferromagnetism in the samples, likely due to the generation of oxygen vacancies and F-centers.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Fatemeh Abbasi, Fahimeh Zahedi, Mohammad Hasan Yousefi
Summary: This study synthesized pure zinc oxide and cadmium-doped zinc oxide nanorods through thermal decomposition, analyzing their optical, structural, and morphological characteristics using various techniques. The incorporation of Cd led to a change in morphology and enhanced specific peak in the UV region of the PL spectra. ZnO:Cd samples exhibited significant photosensitivity in UV photodetection applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
