Article
Chemistry, Physical
Javier Crespo-Miguel, Sergio Lucarini, Angel Arias, Daniel Garcia-Gonzalez
Summary: Additive manufacturing allows for the design of thermoplastic components with structural support, electrical conductivity, and heat generation modulated by mechanical deformation. However, the mechanisms and interplays governing material response at the microstructural level are still uncertain. In this study, we develop an experimental method to characterize conductive filaments from mechanical, electrical, and thermal perspectives, and propose a homogenization framework to analyze the microstructure. The framework considers viscoplasticity, electrical and thermal conduction, convection, heat generation through the Joule effect, and their interdependencies. After validation, the framework is applied to optimize fabrication requirements for desired properties in final products, such as stiffness, conductivity, and sensing capabilities of filaments.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Engineering, Manufacturing
Nathan Lazarus, Joshua B. Tyler, Jorge A. Cardenas, Brendan Hanrahan, Harvey Tsang, Sarah S. Bedair
Summary: This study demonstrates a new electroless plating method for metallizing plastic 3D printed parts without the use of expensive precious metal catalysts. By electrolessly plating conductive composite filaments, loaded with metal or other conductive particulate, with exposed particles serving as nucleation sites, the researchers achieved successful metalization of plastic parts. The use of a flash of high energy white light to ablate the polymer surface and expose a higher density of metal particulate was also shown to accelerate the plating process. Selective plating using a dual extruder 3D printer was utilized to reduce resistance. The results of this study highlight the importance and potential of this new electroless plating method for the fabrication of conductive composite materials.
ADDITIVE MANUFACTURING
(2022)
Article
Electrochemistry
Fangzhao Pang, Peng Li, Zhuqing Zhao, Lei Guo, Kaifa Du, Bowen Deng, Dihua Wang, Huayi Yin
Summary: Electrolysis of solid oxides in molten CaCl2 has been proven effective for metal extraction, but the formation of CaO leads to carbon contamination and decreased current efficiency. The substitution of CaO with CaSiO3 can suppress the formation of CO3 (2-) and reduce carbon deposition.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Multidisciplinary Sciences
Shaobo Cheng, Min-Han Lee, Xing Li, Lorenzo Fratino, Federico Tesler, Myung-Geun Han, Javier Del Valle, R. C. Dynes, Marcelo J. Rozenberg, Ivan K. Schuller, Yimei Zhu
Summary: Vanadium dioxide (VO2) is capable of metal-insulator transition and resistive switching, making it suitable for neuromorphic computing hardware. This study reveals the mechanisms of both volatile and nonvolatile switching in VO2, which can emulate neuronal and synaptic behaviors, respectively, providing a comprehensive understanding of resistive switching crucial for neuromorphic computing development.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Multidisciplinary
Silvia Diabate, Lucie Armand, Sivakumar Murugadoss, Marco Dilger, Susanne Fritsch-Decker, Christoph Schlager, David Beal, Marie-Edith Arnal, Mathilde Biola-Clier, Selina Ambrose, Sonja Mulhopt, Hanns-Rudolf Paur, Iseult Lynch, Eugenia Valsami-Jones, Marie Carriere, Carsten Weiss
Summary: The study suggests that exposure to MNMs at the ALI is more sensitive than under classical submerged conditions, especially for titania NPs. Titania NPs not only triggered cytotoxicity and inflammatory responses, but also induced genotoxicity. Further development of ALI systems may potentially replace acute pulmonary toxicity studies in animals.
Article
Engineering, Electrical & Electronic
Konstantin Lovchinov, Lyubomir Slavov, Gergana Alexieva, Petar Ivanov, Georgi Marinov, Rositsa Gergova, Velichka Strijkova, Tzvetanka Babeva
Summary: Studies have shown that electrochemically deposited nanostructured layers of ZrO2 on different conductive substrates exhibit polycrystalline nature with typical characteristic reflections of ZrO2. The layers' structural properties were determined using X-ray diffraction, while morphological investigations were carried out using scanning electron microscopy and optical profilometry. The optical properties of the structures suggest that these layers are promising candidates as rear contacts of thin-film solar cells.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Multidisciplinary Sciences
Kyunghwan Min, Dongmyung Jung, Yongwoo Kwon
Summary: This study presents simulations of conductive filament formation in resistive random-access memory using a finite element solver, considering the switching material as a two-phase material. The research focuses on studying the forming-voltage uniformity and finding that a protruding electrode can significantly improve the switching uniformity.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Cheng Chang, Jiguo Tu, Yunfei Chen, Mingyong Wang, Shuqiang Jiao
Summary: A low-temperature electro-deoxidation strategy for solid SeO2 was proposed for the first time, and the process and products were analyzed in detail. This has significant implications for short-process and green metallurgy of other characteristic scattered metals.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Applied
Rebecca Dhawle, Spyridon Giannakopoulos, Zacharias Frontistis, Dionissios Mantzavinos
Summary: This study focused on the degradation of the synthetic estrogen 17 alpha-ethinyl estradiol (EE2) using a combined pho-toelectrocatalysis (PEC) and peroxymonosulfate (PMS) process. TiO2/WO3 photoanodes were used, and the addition of PMS and an external bias significantly improved the removal efficiency of EE2. The rate constant for the combined PEC-PMS process was higher than that of the individual PMS process and PEC process. The presence of electrolytes played a crucial role in the efficiency of the degradation process.
Article
Materials Science, Multidisciplinary
Yu. A. Amelkovich, A. V. Mostovshchikov, O. B. Nazarenko
Summary: The morphology and phase composition of combustion products of Al nanopowder mixed with diamagnetic TiO2 and ZrO2 in air were investigated. The use of non-uniform magnetic field during combustion of oxide-metal powdery mixtures resulted in the stabilization of TiN and ZrN in the final products. The combustion of Al-TiO2 mixture formed two-level whiskers of AlN, while the combustion of Al-ZrO2 mixture resulted in agglomerated structures covering the large particles of ZrN. During combustion of oxide-metal mixtures in non-uniform magnetic field, diamagnetic metal dioxides were reduced to metals or their suboxides and reacted with atmospheric nitrogen.
Article
Chemistry, Multidisciplinary
Xiao Huang, Jun Xing, Zhengao Wang, Jin Han, Renxian Wang, Changhao Li, Cairong Xiao, Fang Lu, Jinxia Zhai, Zhengnan Zhou, Yangfan Li, Lei Zhou, Zhiguo Song, Dafu Chen, Peng Yu, Chengyun Ning, Xieyuan Jiang
Summary: The researchers successfully enhanced the attachment, spreading, and osteogenic differentiation of bone cells by designing TiO2 nanocone/Bi2O3 nanodot heterojunctions on the bone implant surface, thereby improving osseointegration and bone regeneration capabilities.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Chih-Chieh Hsu, Han Chuang, Wun-Ciang Jhang
Summary: This paper examines the effect of annealing temperature on the resistive switching behavior of Al/WOx/ITO memories, revealing that the resistance ratio and performance of the devices can be significantly altered by adjusting the annealing temperature. The study demonstrates that differences in crystallinities, oxygen-vacancy defects, and surface morphologies during the annealing process contribute to variations in the performance of the memories, with aluminum conductive bridges playing a key role in explaining the RS mechanisms of WOx RRAMs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Xianwei Geng, Ruowei Yi, Xiangfei Lin, Chenguang Liu, Yi Sun, Yingchao Zhao, Yinqing Li, Ivona Mitrovic, Rui Liu, Li Yang, Cezhou Zhao
Summary: A high-performance method for preparing lithium-sulfur batteries is proposed, and the batteries fabricated with composite materials exhibit high specific capacity and stable cycle life. The study demonstrates that SWCNT can enhance the conductivity of the composite, while the strong adsorption ability of TiO2 can increase the cycle life of the battery.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Kena Zhang, Panchapakesan Ganesh, Ye Cao
Summary: Recent experimental works have shown that embedding metal nano-islands (NIs) in metal oxides can effectively improve the uniformity of memristors. A physical model was developed to understand the role of embedded NIs and how they improve the performance and uniformity of memristors. It was found that embedding metal NIs can modulate electric field distribution, resulting in a more deterministic formation of conductive filaments (CFs) and enhancing the uniformity of operation voltages and current ON/OFF ratios.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Ricky W. Chuang, Chung-Chieh Shih, Cheng-Liang Huang
Summary: Electrode-dependent resistive random access memories (ReRAM) with different electrode materials and an active dielectric layer of bismuth ferrite (BFO) were fabricated and characterized. The Ag/BFO/ITO combination showed excellent electrical properties, with more than 1200 switching cycles endurance and a high on/off current or resistance ratio. The study revealed the dominant mechanisms of metal ion migration and oxygen vacancy conduction in the conductive filament formation and destruction. Comparison with a ReRAM using a dual dielectric layer of BFO/α-Fe2O3 showed a special two-step reset phenomenon explained by filament theory.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Physics, Applied
Aftab Saleem, Firman Mangasa Simanjuntak, Sridhar Chandrasekaran, Sailesh Rajasekaran, Tseung-Yuen Tseng, Themis Prodromakis
Summary: Inserting an oxidizable metal diffusion barrier in TaOx-based conducting bridge memristor devices enhances the switching stability and synaptic performances.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Sailesh Rajasekaran, Firman Mangasa Simanjuntak, Sridhar Chandrasekaran, Debashis Panda, Aftab Saleem, Tseung-Yuen Tseng
Summary: The Ta2O5/WO3 double-layer wearable memristor synapse shows excellent recognition accuracy after a small number of training epochs. It has outstanding durability, withstanding extreme bending, high temperature, and water resistance.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Farish Irfal Saaid, Muhd Firdaus Kasim, Chien-Chih Yang, Amit Kumar, Tseung-Yuen Tseng, Tan Winie
Summary: Different morphologies of FeCo2O4 nanomaterials were obtained by varying the duration of hydrothermal reaction. The FeCo2O4 nanosheets exhibited the highest specific capacitance and were used to fabricate solid-state supercapacitors and dye-sensitized solar cells, showing promising applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Analytical
Pragya Singh, Firman Mangasa Simanjuntak, Li-Lun Hu, Tseung-Yuen Tseng, Hsiao-Wen Zan, Jinn P. Chu
Summary: In this study, ZnO nanorod films were successfully grown on annealed ZnO seed layers at different ambient temperatures. The morphology of the nanorods was found to affect the gas sensing response to nitric oxide (NO) gas. Annealing treatment changed the seed layer's grain size and defect concentration and was responsible for the observed phenomenon. The devices exhibited good sensing response to NO concentration of 10 ppb and up to 100 ppb.
Article
Nanoscience & Nanotechnology
Firman Mangasa Simanjuntak, Julianna Panidi, Fayzah Talbi, Adam Kerrigan, Vlado K. Lazarov, Themistoklis Prodromakis
Summary: The insertion of a metal layer between an active electrode and a switching layer leads to the formation of a ternary oxide at the interface. The properties of this self-formed oxide are dependent on the Gibbs free energy of oxide formation of the metal (Delta G degrees(f)). The role of various ternary oxides in the switching behavior of conductive bridge random access memory (CBRAM) devices was investigated. The ternary oxide acts as a barrier layer that limits the mobility of metal cations in the cell, promoting stable switching. Choosing a metal layer with an appropriate Delta G degrees(f) is crucial for achieving reliable CBRAM devices.
Article
Physics, Applied
Firman Mangasa Simanjuntak, Takeo Ohno, Kana Minami, Seiji Samukawa
Summary: A Cu/ZnO/ITO resistive random access memory (RRAM) structure was employed to investigate the effect of neutral oxygen beams as a surface treatment on ZnO films. The treatment reduced defect concentration in the sputtered-ZnO film and improved the resistance change characteristics of the device. These results indicate the great potential of neutral oxygen beams in the development of RRAM devices using ZnO films.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Om Kumar Prasad, Sridhar Chandrasekaran, Chin-Han Chung, Kow-Ming Chang, Firman Mangasa Simanjuntak
Summary: This study investigates the effect of annealing on the switching characteristics of memristor devices and finds that the properties of annealed films encourage the diffusion of metal species in the oxide. The increase in non-lattice oxygen and the structure of the conducting bridge play a crucial role in determining the switching stability of the devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Chia-Cheng Hsu, Saransh Shrivastava, Sparsh Pratik, Sridhar Chandrasekaran, Tseung-Yuen Tseng
Summary: This study improves the resistive switching and synaptic characteristics of a Zn2SnO4-based optoelectronic synaptic memristor (OSM) by inserting an ultrathin MgO layer, resulting in improved nonlinearities of LTP and LTD curves. Under illumination, OSM emulates synaptic functions such as paired pulse facilitation, learning experience behavior, and short- to long-term memory transition. This transparent ZTO/MgO-based OSM with the convergence of nonvolatile electronic memory and visible light sensor is suitable for neuromorphic computing applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Review
Chemistry, Multidisciplinary
Sridhar Chandrasekaran, Arunkumar Jayakumar, Rajkumar Velu
Summary: Printable electronics is a rapidly growing engineering field with high customization and reliability, requiring sustainable printing technology to minimize environmental waste. This review systematically discusses manufacturing materials and processing technologies and evaluates papers published in peer-reviewed journals in the past decade (2012-2022). Various types of printable inks and printing methods are examined, along with critical challenges such as the coffee ring effect and potential solutions. The review concludes with a summary of printable electronics' applications in diverse industrial manufacturing sectors.
Article
Chemistry, Physical
S. Nishanth, S. Nivithaa, C. Sridhar, K. S. Nagaraja, C. Karnan
Summary: Methylhydroxy(diphenyl)ethanoate was synthesized through a facile reaction of benzilic acid and methanol using FeCl3 as a catalyst. The compound was characterized by various techniques and was found to exhibit potential applications for OLED due to its blue and green emissions. The presence of Fe3+ in the crystal lattice was confirmed through EPR analysis. Published by Elsevier B.V. in 2023.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Multidisciplinary
Bhaskar Pattanayak, Phuoc-Anh Le, Debashis Panda, Firman Mangasa Simanjuntak, Kung-Hwa Wei, Tan Winie, Tseung-Yuen Tseng
Summary: High-performance porous 3D graphene-based supercapacitors with ultra-high surface area and various-sized micropores were fabricated. The use of 1M KOH electrolyte resulted in the highest specific capacitance of the graphene electrode, which was achieved through counter ion adsorption, co-ion desorption, and ion permutation mechanisms. Symmetrical solid-state supercapacitors using graphene electrodes and PVA-KOH gel as the electrolyte exhibited excellent energy and power densities, as well as superior coulombic efficiency even after 6000 cycles.
Article
Engineering, Electrical & Electronic
Tahta Amrillah, My Ngoc Duong, Yu-Xun Chen, Yugandhar Bitla, Malik Anjelh Baqiya, Fitri Nur Indah Sari, Le Thi Quynh, Angga Hermawan, Firman Mangasa Simanjuntak, Chia-Hao Chen, Kaung-Hsiung Wu, Jenh-Yih Juang
Summary: YMO thin films exhibit distinctly different microstructures, electronic structures, and magnetic properties grown on substrates with different polarities, indicating the substantial influence of substrate surface polarity on film properties.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
