Article
Engineering, Electrical & Electronic
J. R. Ramos-Serrano, S. Alcantara-Iniesta, M. Acosta-Osorno, Ma Estela Calixto
Summary: This work explores the piezoelectric response of ZnO thin films deposited by ultrasonic spray pyrolysis with a preferential orientation at the c-axis. The results show that higher temperatures lead to improved crystalline film quality and grain size. The angular distribution of the crystals on the substrate plane deviates slightly from the normal at higher temperatures. Moreover, a prototype based on ZnO thin films was fabricated to measure the piezoelectric response, and samples with better crystallinity and high resistivity exhibit the most intense measured piezoelectric voltage.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Optics
Manohar Singh, Anit K. Ambedkar, Shrestha Tyagi, Virendra Kumar, Prashant Yadav, Ashwani Kumar, Yogendra K. Gautam, Beer Pal Singh
Summary: In this study, pure ZnO and Cu-doped ZnO thin films were deposited on a glass substrate using reactive co-sputtering. The structural, morphological, and optical properties of the thin films were characterized. The results showed that Cu doping modified the crystal structure, surface morphology, and optical properties of ZnO thin films. These findings are important for the research and applications of Cu-doped ZnO thin films.
Article
Polymer Science
Juan Jesus Rocha-Cuervo, Esmeralda Uribe-Lam, Cecilia Daniela Trevino-Quintanilla, Dulce Viridiana Melo-Maximo
Summary: This study presents an alternative post-curing treatment for photopolymer substrates considering the plasma produced via the sputtering process. The effect of sputtering plasma on the properties of Zn/ZnO thin films deposited on photopolymer substrates, with and without UV treatment, was analyzed. The results showed the influence of plasma as a post-cured treatment alternative and the effect on film thickness and roughness values.
Article
Materials Science, Multidisciplinary
Justin Ryan Phelps, Ashwin Kumar Saikumar, Reza Abdolvand, Kalpathy B. B. Sundaram
Summary: This study reports the material properties of gallium-doped zinc oxide grown from a high impulse magnetron sputtering system (HiPIMS) and compares them to those of radio frequency (RF) sputtering deposition. The results show that HiPIMS and RF processes yield similar outcomes under the same average power conditions. RF depositions exhibit slightly higher band gap and deposition rate, as well as lower resistivity and optical absorption coefficient. Both methods show that band gaps and grain size increase with deposition power.
Article
Chemistry, Physical
Alexander Axelevitch
Summary: Transparent conductive oxide (TCO) thin films, such as indium-tin oxide (ITO), are widely used in micro- and optoelectronics, with dynamic hot-probe measurement system being one method to extract the main parameters of the films. This method, demonstrated on commercial ITO films and ZnO:Al layers, can also be applied to other wide-bandgap semiconductors.
Article
Metallurgy & Metallurgical Engineering
Yu Zhang, Jie Chen, Ben-shuang Sun, Shuai Liu, Zhi-jun Wang, Shu-han Liu, Yong-chun Shu, Ji-lin He
Summary: In this study, IGZO films were deposited using RF magnetron sputtering technology with a high-purity In2Ga2ZnO7 ceramic target. The films exhibited a uniform and smooth surface at room temperature with good thermal stability. However, as the temperature increased, the surface roughness increased, resulting in decreased performance.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Materials Science, Ceramics
N. Jalalian Karazmoudeh, M. Soltanieh, M. Hasheminiasari
Summary: In this study, pure and zinc-doped copper oxide thin films were successfully deposited on a glass substrate using reactive magnetron sputtering. The effects of oxygen/argon ratio and dopant dosage on the structure, morphology, and topography of the films were analyzed. It was found that different oxygen partial pressures resulted in the formation of different phases of copper oxide, and doping with zinc affected the crystal structure and cell volume of the films. The applied RF power and Zn concentration also influenced the cationic ratio and surface roughness of the films, respectively. However, the grain size was not significantly affected by Zn doping.
CERAMICS INTERNATIONAL
(2023)
Review
Biochemistry & Molecular Biology
Hong Yong Sohn, Arun Murali
Summary: This article reviews and summarizes recent work in this laboratory on the synthesis of advanced transparent conducting oxide nanopowders using plasma. The process involves selecting suitable precursors, injecting them into a non-transferred thermal plasma, vaporizing them, and forming nanosized oxide particles through vapor-phase reactions. The thermal plasma process shows great potential as an efficient technique for synthesizing oxide nanopowders.
Article
Chemistry, Physical
Marcio A. Correa, Armando Ferreira, Raphael M. Tromer, Leonardo D. Machado, Matheus Gamino, Sergio A. N. Franca Junior, Felipe Bohn, Filipe Vaz
Summary: ZnO and doped ZnO films are commonly used as biosensor elements, with room-temperature ferromagnetic behavior observed in all studied samples, including pure ZnO. Computational simulations were used to investigate the origin of ferromagnetism, revealing the influence of vacancy dynamics and columnar geometry on the magnetic properties of the films. This study highlights the potential for inducing/exploring room-temperature ferromagnetism in non-ferromagnetic metal-doped semiconductors for biosensor applications.
Article
Engineering, Electrical & Electronic
Kasi Radha, Bhuvaneswari Selvaraj, Parthasarathy Srinivasan, Akshay Krishnakumar, John Bosco Balaguru Rayappan, K. Jayanth Babu
Summary: This study reports the acetaldehyde-sensing properties of tungsten-doped ZnO thin films deposited using the SILAR technique, showing that tungsten doping enhances the response to acetaldehyde, particularly with the 10 mM tungsten-doped ZnO thin film exhibiting a response of 947 to 100 ppm acetaldehyde.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Physics, Applied
T. Harada, T. Nagai, M. Oishi, Y. Masahiro
Summary: This study reports the successful growth of c-axis-oriented PdCoO2 thin films on Al2O3 (001) substrates using magnetron sputtering. The films exhibited layered crystal structures, with a clear interface stacking sequence of Pd/CoO2/Al2O3. This layer stacking induces a high work function at the interface. Post-annealing treatment significantly decreased the resistivity of the films. Impurity phases of PdOx were observed using X-ray diffraction and scanning transmission electron microscopy. The sputtering deposition of c-axis-oriented thin films provides potential practical applications for the polar surface of PdCoO2 in semiconductor devices.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Joana M. Ribeiro, Frederico J. Rodrigues, Filipe C. Correia, Inga Pudza, Alexei Kuzmin, Aleksandr Kalinko, Edmund Welter, Nuno P. Barradas, Eduardo Alves, Alec P. LaGrow, Oleksandr Bondarchuk, Alexander Welle, Ahmad Telfah, Carlos J. Tavares
Summary: Transparent ZnO:Sb thin films were deposited using magnetron sputtering, and their structure and disorder were studied. It was found that Sb doping influenced the crystalline structure and promoted partial amorphization. A film with 12 at% of Sb exhibited the highest Seebeck coefficient and thermoelectric power factor.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Coatings & Films
L. Lapeyre, C. Hain, P. Sturm, J. Metzger, A. Borzi, K. Wieczerzak, P. Raynaud, J. Michler, T. Nelis
Summary: In this study, highly oriented c-axis aluminium scandium nitride (AlScN) piezoelectric thin films were successfully deposited via microwave plasma-assisted reactive high power impulse magnetron sputtering (MARHiPIMS), without the need for substrate heating. By optimizing the deposition conditions using in situ plasma diagnostics, the nitrogen supply and ionic flux at the substrate region were maximized while maintaining stable discharge conditions. The AlScN thin films exhibited strong texture and stoichiometric compositions when prepared with microwave plasma, showing potential for a promising piezoelectric response.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
B. C. Bussell, P. N. Gibson, J. Lawton, P. Couture, M. K. Sharpe, J. England, S. J. Hinder, V. Stolojan, S. A. Thornley, M. A. Baker
Summary: Aluminium-doped ZnO (AZO) thin films were deposited by remote plasma sputtering and their microstructure, chemical composition, and residual stress were investigated. The films exhibited optimum resistivity and optical transmittance at a specific RF plasma power of 1.5 kW. Factors such as grain size, orientation, and preferential sputtering affected the film properties.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Physical
V. V. Siva Kumar
Summary: High doses of gamma ray irradiation can lead to improvements in the structure and morphology of ZnO thin films, including enhancements in the wurtzite phase and reduction in crystallite size, as well as inducing surface rearrangement and changes in roughness.
RADIATION PHYSICS AND CHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Sihao Li, Yuan Sun, Yazhou Chen, Jinwei Lu, Guangyao Jiang, Kang Yu, Yifan Wu, Yufei Mao, Hao Jin, Jikui Luo, Shurong Dong, Bin Hu, Yi Ding, An Liu, Yu Shen, Gang Feng, Shigui Yan, Yong He, Ruijian Yan
Summary: This study used an ordered 3D sandwich model to investigate the cell response in tendons and found that tendon stem/progenitor cells (TSPCs) maintained their ordering growth in the 3D model. The 3D-aligned TSPCs exhibited enhanced tenogenic differentiation and a less inflammatory phenotype compared to the 2D model, which can promote tendon regeneration.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Zimeng Hu, Hangfeng Zhang, Zhigang Zhu, Jiangtao Zeng, Dou Zhang, Mirva Eriksson, Giuseppe Viola, Haixue Yan
Summary: The majority of piezoelectric ceramics based on Pb(Zr, Ti)O-3 (PZT) exhibit hysteretic behavior, which varies depending on various factors. The ternary system 0.05Pb(Mn1/3Sb2/3)O-3-0.95Pb(Zr0.52Ti0.48)O-3 (5PMS-PZT) has shown attractive piezoelectric properties with superior thermal stability. This work further delves into the hysteretic aspects of 5PMS-PZT ceramics and describes unique hysteresis features influenced by various factors.
Article
Engineering, Environmental
Yu Yao, Zhanhong Li, Yutong Han, Lili Xie, Xueling Zhao, Zhigang Zhu
Summary: In this study, MnO2 with high catalytic activity was introduced onto MXene material, improving the sensitivity and selectivity of the gas sensor. The composite material exhibited a 10-20 times higher response to different volatile organic compounds compared to the pristine MXene-based sensor, and showed a unique and stable response to the lung cancer marker hexanal.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Physics, Multidisciplinary
Yingjun Chen, Zhigang Zhu
Summary: This paper presents a novel method that integrates piecewise linear representation (PLR), improved particle swarm optimization (IPSO), and a feature-weighted support vector machine (FW-WSVM) to analyze the nonlinear relationships between trading signals and stock data hidden in historical data. The proposed method achieves higher prediction accuracy and profitability, indicating the effectiveness of IPSO-FW-WSVM in trading signal prediction.
Article
Chemistry, Physical
Daiqing Zhu, Yihong Zhang, Weipeng Xuan, Jinkai Chen, Miling Zhang, Jikai Zhang, Hao Jin, Shurong Dong, Jikui Luo
Summary: This work focuses on the development of Pt-Rh alloy-based multilayered composite IDTs for high-temperature applications. The composite electrodes were prepared by magnetron sputtering, and their resistance and surface morphology were investigated at temperatures up to 1600 degrees C. The results showed that the composite electrodes could withstand a maximum operating temperature of 1600 degrees C in air.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Yihong Zhang, Daiqing Zhu, Weipeng Xuan, Hao Jin, Shurong Dong, Jikui Luo
Summary: This study presents a single crystalline AlN film-based ultrahigh temperature surface acoustic wave (SAW) device. By applying a thin Al2O3 protection layer on the surface, the oxidation of the AlN piezoelectric film at high temperatures was effectively inhibited. A composite electrode based on a multilayer structure of Pt-Rh and Al2O3 was designed and fabricated to suppress the inter-diffusion, agglomeration, and vaporization of the metals. The results demonstrated that the developed AlN SAW devices can withstand high temperatures and work well up to 1400 degrees Celsius.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Analytical
Yingqi Jiang, Jin Chen, Weipeng Xuan, Yuhao Liang, Xiwei Huang, Zhen Cao, Lingling Sun, Shurong Dong, Jikui Luo
Summary: This study proposes and analyzes integrated multi-stage SSAW devices for efficient separation of multiple cell particles, achieving a separation efficiency of 99% for three different size particles.
Article
Chemistry, Analytical
Yu Yao, Zifeng Wang, Yutong Han, Lili Xie, Xueling Zhao, Saeed Shahrokhian, Nicolae Barsan, Zhigang Zhu
Summary: In this study, a Cr2O3/TiO2/Ti3C2Tx gas-sensitive material was successfully synthesized, showing a unique rapid and selective response to Triethylamine. Furthermore, the sensor exhibited excellent chemical stability and maintained its morphology and gas sensing performance even after ageing at 500 degrees C for two months. This research demonstrates the validity of the proposed approach for an additional metal oxide and highlights the excellent practical application potential of the sensor in harsh environments.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Physical
Haobin Wang, Shuyi Huang, Haoze Kuang, Chi Zhang, Yulu Liu, Kaihang Zhang, Xinyu Cai, Xiaozhi Wang, Jikui Luo, Zhong Lin Wang
Summary: Triboelectrification between metals, polymers, and semiconductors was investigated, revealing a universal mechanism involving both electrostatic induction and dynamic junction modulation. The outputs of triboelectrification exhibited four current/voltage peaks, two of which were attributed to electrostatic induction effects and determined by surface state densities and electron affinity differences between the materials. The other two peaks were associated with dynamic junction modulation effects and determined by charging exchange between surface states and depletion regions. While metals and polymers showed no modulation of depletion regions, only the peaks induced by electrostatic induction were observable. Semiconductors, on the other hand, exhibited additional peaks induced by junction modulation when in contact with any material type. These findings provide valuable insights for developing high-performance triboelectric nanogenerators.
ADVANCED ENERGY MATERIALS
(2023)
Article
Physics, Applied
Jianhui Wu, Jie Li, Chi Zhang, Yulu Liu, Liangquan Xu, Weipeng Xuan, Hao Jin, Shurong Dong, Jikui Luo
Summary: A method for eigenstate tuning in radio-frequency (RF) CPAL systems is proposed, enabling the realization of CPAL states with ultrahigh sensitivity. A CPAL-based RF sensor system is developed for verification, significantly broadening the application scope of CPAL systems.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Rui Ding, Weipeng Xuan, Feng Gao, Tengbo Cao, Hao Jin, Jikui Luo, Fei Ma, Shurong Dong
Summary: In this study, a modified Mason model of bulk acoustic wave (BAW) resonators is proposed, and a high-performance filter is designed and fabricated. The results show that the resonator size variation affects both the parallel and serial resonant frequencies. The modified model enables more accurate filter design.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Xinyu Cai, Kaihang Zhang, Jianhui Wu, Jie Li, Hao Jin, Shurong Dong, Jinkai Chen, Weipeng Xuan, Jikui Luo
Summary: This paper reports on the design and fabrication of a tunable and switchable FBAR device based on a thin crystalline PZT film. The device has a resonant frequency of 2.42 GHz and a tuning range of up to 400 MHz with a bias voltage of less than 12 V. The switchable feature is achieved when the polarization intensity in the PZT film is zero, providing potential applications in RF circuits.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Chemistry, Analytical
Yubo Li, Jiadong He, Cangcang Fu, Ke Jiang, Junjie Cao, Bing Wei, Xiaozhi Wang, Jikui Luo, Weize Xu, Jihua Zhu
Summary: Pain management is crucial in medicine, especially for children who struggle to communicate their pain effectively. This paper presents a pain assessment scheme based on skin potential signals, aiming to provide objective pain identification using machine learning methods. Experimental data from 623 subjects were analyzed, and 358 valid records were selected. Seven features showed superior performance in pain identification, with the random forest algorithm achieving the highest accuracy of 70.63%. While our results differ from previous research, our pain assessment scheme demonstrates significant potential in clinical settings.
Article
Computer Science, Information Systems
Yingjun Chen, Zhigang Zhu
Summary: This paper presents a novel method that combines piecewise linear representation (PLR) with a deep learning framework to predict financial trading points. The method utilizes PLR to generate turning points from trading data and formulates the prediction problem as a three-class classification. The proposed method uses a CNN for spatial features extraction and an LSTM network for temporal domain features extraction. Experimental results demonstrate that the method outperforms other approaches in terms of model performance and profitability with different investment strategies.
Article
Chemistry, Analytical
Zhuo Shi, Zifeng Wang, Kaiwen Li, Yuwei Wang, Zhanhong Li, Zhigang Zhu
Summary: In this study, a molecularly imprinted electrochemical sensor based on MXene fibers was proposed. MXene fibers were prepared using the wet spinning technique, and molecularly imprinted polymers were synthesized on the surface of MXene fibers using electro-polymerization. The electrochemical sensor exhibited superior selectivity and sensitivity for hydrocortisone, and showed excellent application performance in serum.
