Article
Engineering, Environmental
Pil Gyu Choi, Akihiro Tsuruta, Yoshitake Masuda
Summary: Detection and discrimination of gases are crucial in various fields and the demand for easy and fast detection of various gas substances is increasing. This study improved the sensing property by modifying carbon nanotubes (CNT) with nanosheet-type tin oxide (SnO2), resulting in superior sensing properties and improved selectivity for ammonia gas. The accuracy of ammonia gas classification was significantly increased when using the modified sensor in the sensor array, showing its potential for ammonia gas detection and discrimination.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Analytical
Maeum Han, Soonyoung Jung, Yeonsu Lee, Daewoong Jung, Seong Ho Kong
Summary: In this study, a PEI-functionalized CNT sensor was fabricated for detecting carbon dioxide at room temperature. The sensor exhibited better sensitivity to CO2 gas compared to the pristine CNT sensor, and showed good repeatability and selectivity. The morphology and properties of the sensor were analyzed using SEM, Raman spectroscopy, and FT-IR spectroscopy.
Article
Chemistry, Analytical
Srijeet Tripathy, Avik Sett, Santanab Majumder, Tarun Kanti Bhattacharyya
Summary: This study investigates the effects of gate voltage on ammonia sensing properties of carbon nanotube thin film transistors (CNT TFT). The sensitivity and detection limit of the device are found to be significantly improved under the influence of a gate field. The amplification of sensor response is attributed to the increase in adsorption energy of ammonia due to the gate field, as well as the reversible increase of contact resistance induced by ammonia exposure in the negative gate regime.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Analytical
Daniel Sim, Tiffany Huang, Steve S. Kim
Summary: Biorecognition element (BRE)-based carbon nanotube (CNT) chemiresistors have the potential to serve as highly sensitive, selective, and power-efficient volatile organic compound (VOC) sensors. Moderate CNT density and stable connection of the nanotube network contribute to the best signal-to-noise ratio.
Article
Chemistry, Multidisciplinary
Anca F. Bonciu, Mihaela Filipescu, Stefan I. Voicu, Thomas Lippert, Alexandra Palla-Papavlu
Summary: This study presents NH3 sensors fabricated using LIFT, composed of single-walled carbon nanotubes and tin oxide nanoparticles, which demonstrate excellent detection performance including fast response, low detection limit, and reversibility.
Article
Chemistry, Analytical
Masafumi Inaba, Takenori Oda, Masaki Kono, Nisarut Phansiri, Takahiro Morita, Shota Nakahara, Michihiko Nakano, Junya Suehiro
Summary: The study fabricated CNT/SnO2 heterojunction gas sensors using one-step dielectrophoretic assembly and investigated the effect of CNT/SnO2 ratio on gas detection properties. The results showed that the UV-irradiated CNT/SnO2 heterojunction gas sensor had a high response to 1 ppm NO2 in artificial air.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Can Liu, Jinyong Hu, Guang Wu, Juexian Cao, Zhiyong Zhang, Yong Zhang
Summary: A novel carbon-based FET-type gas sensor is proposed for highly sensitive and stable formaldehyde detection at ppb levels, showing low detection limits and excellent reproducibility. The use of an independent gas-sensing gate as the sensitive function in the FET-type sensor improves its detection performance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Jeonhyeong Park, Chaehyun Ryu, Il Ryu Jang, Soon In Jung, Hoe Joon Kim
Summary: This paper presents a detailed study on the impact of strain on the morphology and performance of multi-walled carbon nanotube (MWCNT) based nitrogen dioxide (NO2) gas sensors, and analyzes the strain effect on the NO2 gas sensing performance. This study is important for the development of high-performance flexible and stretchable gas sensors.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Kalpana Settu, Yi-Cheng Lai, Chen-Ting Liao
Summary: This study utilized laser-induced graphene electrode to detect hydrogen peroxide, with improved sensitivity through surface modification, demonstrating good linear characteristics. The proposed MWCNT-modified LIG sensor showed great potential in disposable H2O2 sensing applications.
Article
Chemistry, Physical
Shaoyuan Zhou, Mengmeng Xiao, Fangfang Liu, Jianping He, Yanxia Lin, Zhiyong Zhang
Summary: By adopting a floating gate (FG) field-effect-transistor (FET) structure with Y2O3 dielectric layer, the sensitivity and performance of carbon nanotube (CNT) based hydrogen sensors have been significantly enhanced, achieving a detection limit of 90 ppb and even down to 5 ppb at 100 degrees C. FG FET sensors show more than one magnitude enhancement in response compared to conventional resistance-type sensors, with excellent stability and compatibility to CNT integrated circuits, making them a potential platform for developing smart sensors.
Article
Computer Science, Information Systems
Fangfang Liu, Mengmeng Xiao, Yongkai Ning, Shaoyuan Zhou, Jianping He, Yanxia Lin, Zhiyong Zhang
Summary: Researchers have developed a gate assistant technology to accelerate the recovery of gas sensors and promote their practical application, by applying voltage to speed up the desorption of gas molecules in semiconducting carbon nanotube films. This technology, combined with a modified concentration calculation method, has resulted in highly reproducible and rapid detection systems for hydrogen gas.
SCIENCE CHINA-INFORMATION SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Yijun Yang, Bohee Maeng, Dong Geon Jung, Junyeop Lee, Yeongsam Kim, JinBeom Kwon, Hee Kyung An, Daewoong Jung
Summary: The study focuses on the performance of SnO2 thin film sensors for H-2 gas, revealing that annealed films exhibit higher response and shorter response time.
Article
Physics, Applied
Daichi Suzuki, Daniela Serien, Kotaro Obata, Koji Sugioka, Aiko Narazaki, Nao Terasaki
Summary: In this study, the potential and application of laser-based micro-processing for patterning CNT films were assessed. It was found that this method can pattern micrometre-thick CNT films in micrometre spatial resolution and directly pattern the CNT films inside the protective film, which is not achievable by other processing technologies.
APPLIED PHYSICS EXPRESS
(2022)
Article
Engineering, Electrical & Electronic
Ahmad M. Al-Diabat, Natheer A. Algadri, Naser Mahmoud Ahmed, Adnan Bin Hamed Alrajhi, Munirah Abdullah Almessiere, Amal Mohamed Ahmed Ali, Anas A. M. Alqanoo, Abdulwahab S. Z. Lahewil, Salma Abdulrahman Al-Wasli
Summary: The performance of a hydrogen gas sensor based on carbon nanotubes can be greatly improved through acid treatment or functionalization.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Seongwoo Lee, Sanghwan Park, Seongyeop Lim, Cheongha Lee, Chang Young Lee
Summary: In this study, a chemiresistor array of single-walled carbon nanotubes (SWCNTs) was used to detect and identify gaseous mixtures of toxic industrial chemicals (TICs). The array achieved a limit of detection of 2.2 ppb for ammonia (NH3), 820 ppb for sulfur dioxide (SO2), and 2.4 ppm for ethylene oxide (EtO). Principal component analysis confirmed the detection and identification of TIC mixtures, and the sensor array showed excellent correlation between the sensor response and the mixture composition. This gas sensor array has great potential for monitoring the safety and environmental effects of industrial chemical processes.
Article
Materials Science, Multidisciplinary
T. Ueda, S. Katsuki, K. Takahashi, H. A. Narges, T. Ikegami, F. Mitsugi
DIAMOND AND RELATED MATERIALS
(2008)
Article
Physics, Multidisciplinary
N. Heidari, H. Hassanabadi, W. S. Chung
Summary: In this paper, the Dirac equation for a fermion in the presence of Dirac delta scalar and vector potential is developed by introducing the q-deformed delta function. The scattering state is investigated by considering the boundary condition and the effect of the q-deformed Dirac delta potential, and the reflection and transmission coefficients are determined. Moreover, the effect of the q-parameter and the potential coefficient on the reflection and transmission coefficients is reported.
Article
Physics, Mathematical
Won Sang Chung, Narges Heidari, Hassan Hassanabadi, Hosein Mohammadzadeh
Summary: In this paper, the generalized Legendre transformation for the GUP Hamiltonian is introduced, and the non-canonical momentum is defined. The momentum in GUP is interpreted as the non-canonical momentum. The GUP Lagrangian for some GUP models is constructed.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
Article
Astronomy & Astrophysics
N. Heidari, H. Hassanabadi, H. Chen
Summary: In this research, the quantum correction of the Schwarzschild black hole metric is investigated based on the generalized uncertainty principle (GUP). A massless scalar field is assumed, with an effective potential determined by the GUP effect. The phase shift of the scattered wave function is found by approximating the effective potential, and the GUP corrected reflection and transmission coefficients of the scattered radial wave function are calculated using the Posch-Teller method.
Article
Astronomy & Astrophysics
N. Heidari, H. Hassanabadi
Summary: This paper presents a new analytical approach using the Rosen-Morse function to calculate the Quasi Normal Modes (QNMs) of black holes. The proposed method provides a more precise approximation compared to previous methods. The corrected modes based on this research are claimed to be a generalized form of QNMs found by the Posch-Teller function. Numerical results of the new approach are calculated and compared with results obtained by the Mashhoon method and numerical method.
Article
Materials Science, Coatings & Films
Yanchun Xie, Xiaodong Wang, Shenshen Cui, Jiali Hu, Yongcun Wei, Yi Lian, Anwu Xuan, Bin Yu, Erlin Zhang
Summary: In this study, Ti-xFe (x = 3,5,9 wt%) alloys were surface modified by micro-arc oxidation (MAO) to improve their antimicrobial properties and biocompatibility. The results showed that increasing the oxidation voltage greatly enhanced the roughness and hydrophilicity of Ti-xFe-MAO alloys. The Ti-xFe alloys micro-arc oxidized at 250 V and 300 V exhibited improved corrosion resistance and excellent antimicrobial and cytocompatibility properties, making them suitable for orthopedic implant materials.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuting Hao, Zuoyan Ye, Lili Wang, Minheng Ye, Hui Dong, Chao Wang, Yunchen Du
Summary: This study focuses on the modification of PEO coatings on Ta-12W alloy using NH4F additive. The results show that ultra-low porosity coatings can be prepared by optimizing the NH4F content. The formation process of specific structures on the coating surface is discussed, and the effects of NH4F concentration and treatment duration on coating characteristics are investigated.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Yuanzhuo Liu, Linjiang Chai, Tao Yang, Chaodan Hu, Chuanmei Wang, Guoqiang Xi
Summary: By employing a pulsed laser, laser cladding was performed on IN718 alloy pre-coated with CrCoNi-TiC/SiC powders and three defect-free coatings were successfully prepared. The addition of TiC and SiC powders generated fine carbides dispersed in the coatings and led to changes in grain and substructure morphologies, resulting in increased hardness and wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
M. Ghaemi, A. Lopez-Cazalilla, K. Sarakinos, G. J. Rosaz, C. P. A. Carlos, S. Leith, S. Calatroni, M. Himmerlich, F. Djurabekova
Summary: The use of high-power impulse magnetron sputtering can result in dense and uniform niobium films on all surfaces of superconducting rf cavities, as simulated and investigated in this study.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Jiaheng Du, Xinli Fan, Dongqin Xiao, Wuxiang Wang, Yiran Yin, Zhong Li, Kui He, Yanfei Tan, Jiyuan Yan, Gangli Liu, Ke Duan
Summary: This study investigated the electrophoretic deposition (EPD) of magnesium oxide (MgO) coatings on micro-arc oxidized titanium (MAO-Ti) and evaluated their in vitro antibacterial properties and biocompatibility. The results showed that MgO coatings significantly reduced bacterial numbers and biofilm formation, while also demonstrating good cytocompatibility and induction of osteoblast mineralization.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Samiksha Moharana, Yuichi Otsuka, R. Gnanamoorthy
Summary: The addition of titania to HAp coatings improves their wear resistance and reduces damage to titanium implants caused by debris generation. This study evaluates the fretting wear resistance of titania-added HAp suspension plasma spray coating and finds that it exhibits reduced friction coefficient and increased wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Li-Ping Wu
Summary: The functional hazenite coating deposited on AZ31 Mg alloy showed improved roughness and hydrophilicity, enhanced biocompatibility, reduced degradation rate, and decreased susceptibility to stress corrosion cracking.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Ning Tian, Delei Xu, Jinfei Wei, Bucheng Li, Junping Zhang
Summary: This study reports the preparation of a superhydrophobic and anti-bacterial fabric for face masks. The fabric exhibits high superhydrophobicity and excellent moisture resistance, enabling functionality effectiveness in cold weather conditions. The fabric also demonstrates remarkable anti-bacterial activity against E. coli, attributed to the synergistic effect of superhydrophobicity and embedded ZnO nanoparticles. This superhydrophobic anti-bacterial fabric holds great potential for various practical applications in personal protective equipment, healthcare, and disease prevention.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Katharina Beck, Anke S. Ulrich, Andreas K. Czerny, Emma M. H. White, Martin Heilmaier, Mathias C. Galetz
Summary: Refractory metal based alloys have great potential as structural materials for high-temperature applications due to their high melting points. However, they are prone to catastrophic oxidation at around 700 degrees C. This study investigated the effect of aluminium diffusion coatings on the oxidation resistance of pure molybdenum, niobium, tantalum, and tungsten. The results showed that the aluminization improved the oxidation behavior and decreased the oxide growth rate for molybdenum and tantalum.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Wenwen Shuai, Haijun Dou, Zhichen Guan, Wei Qian, Zhibao Li, Yinqun Hua, Jie Cai
Summary: This study synthesized (Y1-xLax)3Al5O12 (x = 0, 0.1, 0.2, 0.3) materials by doping lanthanum ions, and found that the doped materials exhibited improved mechanical properties and thermal expansion coefficient, as well as enhanced resistance to CMAS corrosion. These materials have potential applications.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Xianglei Liu, Jiahui Ding, Wanbo Hou, Xinhao Shi, Tao Feng, Xiangyuan Meng, Shifeng Wen, Mingde Tong, Zhufeng Yue
Summary: A composite coating was developed to improve the adhesion, wear resistance, and corrosion resistance, which exhibited significant enhancements in these properties.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hongxuan Xing, Jidong Li, Xianwei Hu, Liang Tian, Renyun Zhang, Yiyong Wang
Summary: By depositing a Cu/Co-Mo corrosion-resistant plating layer on the surface of 6061 Al alloy, the bonding strength between the alloy and the plating layer can be improved and the corrosion resistance can be enhanced. The composite coating forms an obvious three-layer structure with Co-Mo coating exhibiting amorphous characteristics and Co3Mo phase composition. The composite coating improves the corrosion resistance and hardness of the substrate, effectively protecting the 6061 Al alloy.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Fan Yang, Debin Wang, Tianrun Li, Baijun Yang, Suode Zhang, Jianqiang Wang
Summary: The impact-corrosion behavior of monolayer and hierarchical Fe-based amorphous coatings fabricated by HVAF was investigated in 3.5 wt% NaCl solution. The monolayer coating exhibits corrosion failure with increased impact energy, while the hierarchical coating shows improved resistance. However, at high impact energies, both coatings experience corrosion degradation.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Shoaib Ahmad, Muddasir Nawaz, Solaiman Mohammad, R. A. Shakoor, Ramazan Kahraman, Talal Mohammed Al Tahtamouni
Summary: This research presents a novel self-healing anti-corrosion composite coating that demonstrates higher inhibition efficiency and self-healing effect, providing protection for metallic structures against corrosive environments.
SURFACE & COATINGS TECHNOLOGY
(2024)
Article
Materials Science, Coatings & Films
Hui-Wen Peng, Chun-Hway Hsueh
Summary: A series of (CoCrNi)100-x-ySixNdy medium entropy alloy films with manipulated metalloid element, Si, and rare earth element, Nd, were synthesized using magnetron three-target co-sputtering. The films showed different structures and mechanical properties with varying Si and Nd contents. The optimized mechanical properties were observed in the film with Si0.61Nd5.14, attributed to precipitation strengthening and grain refinement.
SURFACE & COATINGS TECHNOLOGY
(2024)