Article
Engineering, Electrical & Electronic
Fanli Meng, Xiaozhi Li, Zhenyu Yuan, Yanfeng Lei, Tianyao Qi, Jin Li
Summary: This article presents a one-step hydrothermal method for the preparation of rGO/Co3O4 nanocomposites and their performance testing. The results show that 1rGO/Co3O4 (335 wt%) has the best sensitivity to xylene gas, with an optimal working temperature of 175 degrees Celsius, and can detect xylene gas with a minimum concentration of 1 pph.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Chemistry, Inorganic & Nuclear
Huazhong Liu, Mahmoud Motlak, Zhi Feng, Afsaneh Kaffash
Summary: In this study, a novel electrochemical sensor based on a hierarchical Co3O4/carbon composite was developed for determination of morphine (MOR). The sensor showed high electrochemical catalytic activity and excellent response for MOR detection. It also demonstrated good selectivity, stability, and reproducibility, making it a suitable platform for MOR detection in body fluids. The simplicity, low cost, and short analysis time of this approach suggest its potential application in clinical and forensic testing for MOR.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Rethabile Makole, Zamaswazi P. Tshabalala, Mudalo Jozela, Franscious R. Cummings, Hendrik C. Swart, David E. Motaung
Summary: This study focuses on the gas sensing properties of Co3O4 - n-type semiconducting metal oxides (Co-nSMOs) heterostructures, particularly the Co3O4-In2O3 (Co-In) heterostructure which exhibited excellent selectivity and response towards xylene. The Co-In sensor showed good sensitivity, low limit of detection, and long-term stability. The improved performance can be attributed to enriched surface oxygen adsorption and the synergistic combination of Co3O4 and In2O3 at the nanoscale p-n heterojunction.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Hongyin Pan, Chen Yang, Wei Zheng, Xianghong Liu, Yong Wan, Jun Zhang
Summary: A gas sensor based on porous Co3O4 thin films decorated by dual Pt/Rh catalysts is demonstrated for efficient NO2 detection in humid environment. The sensor exhibits high response and moisture resistance due to the three-dimensional ordered microstructure of the Co3O4 thin films and the loading of Pt/Rh catalysts by atom layer deposition (ALD). With optimized ALD Pt and Rh thickness, the sensor shows fast response/recovery speed, a low detection limit and the capability to operate under high humidity.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Physics, Multidisciplinary
Jing Zhang, Jianyu Ling, Kuikun Gu, Georgiy G. Levchenko, Xiao Liang
Summary: Metal ions doping is a typical approach to modify the sensing properties of metal oxide semiconductor gas sensors. In this study, hierarchical flower-like pure and In-doped Co3O4 nanostructures with porous two-dimensional (2D) nanosheets were synthesized through a solvothermal method and annealing process. The sensing measurements revealed that the In@Co3O4-4 based sensor showed a high response value of 55.9 towards 100 ppm xylene at 150 degrees C, which was nearly 3.8 times higher than that of the pure Co3O4 sensor. Furthermore, the In@Co3O4-4 sensor exhibited good selectivity and anti-humidity properties. The enhanced gas sensing performance was systematically analyzed by combining the results of DFT calculations.
Article
Chemistry, Analytical
Baihe Sun, Fangjie Qin, Lin Jiang, Jun Gao, Zhuo Liu, Jue Wang, Yang Zhang, Jiahui Fan, Kan Kan, Keying Shi
Summary: A novel NOx gas sensor candidate Co3O4/Al2O3@Ti3C2T MXene was successfully synthesized using a self-sacrificial template and hydrothermal method, showing enhanced response, low detection limit, excellent repeatability and selectivity.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Engineering, Environmental
Wei Wang, Yizhuo Fan, Duo Sun, Heng Guan, Qilin Wang, Yu Chen, Shengping Ruan
Summary: Gas sensors based on MOS materials have the advantages of high sensitivity, adjustable components, low cost and easy integration. MOF-derived MOS materials possess high porosity, which has the potential to detect VOC gases. The introduction of carbon materials can effectively improve the gas-sensing performance. This research synthesized C/Co3O4 nanocomposites and applied them to xylene sensors, achieving significant improvement in xylene-sensing properties. The composites showed higher response to xylene, lower detection limit, shorter response time, and good stability compared to pure Co3O4. This work provides a feasible method to improve the performance of xylene sensor and has reference value for the effect of carbon materials on gas-sensing behavior.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Analytical
Mengran Ran, Zhenyu Yuan, Hongmin Zhu, Hongliang Gao, Fanli Meng
Summary: This study reports a novel Ni(OH)(2)/Co3O4 heterostructured nanomaterial with excellent performance in xylene gas detection. The material exhibits a lower optimal operating temperature, higher response, and lower detection limit compared to other gases. The outstanding performance is attributed to the p-n heterojunction between Ni(OH)(2) and Co3O4. This research provides a strategy for designing high-performance xylene gas sensors using two-dimensional Ni(OH)(2) materials.
Article
Chemistry, Analytical
Bian Tian, Yifan Xing, Xuefeng Zhang, Zhaojun Liu, Zhongkai Zhang, Jiangjiang Liu, Bingfei Zhang, Qijing Lin, Zhuangde Jiang
Summary: To meet the need for micro-volume devices for high-precision measurement of temperature, Cu-Constantan (CuNi45) thin films with a novel array structure of thermo-electrodes were designed and fabricated. Through systematic optimization of the heat treatment process and accuracy correction algorithm, the comprehensive performance of the temperature sensor was improved. The experimental results verified that the sensor has high measurement accuracy and stability over a wide temperature range.
Article
Chemistry, Analytical
Ka Yoon Shin, Ali Mirzaei, Ha Young Lee, Jae Hoon Bang, Wansik Oum, Eun Bi Kim, Hyeong Min Kim, Sanjit Manohar Majhi, Sang Sub Kim, Hyoun Woo Kim
Summary: A core@shell nanograined Ag-Co3O4 structure was developed for the detection of xylene. This structure exhibited high sensitivity and selectivity, and operated at a lower temperature compared to the pristine sensor. The study demonstrates the potential of this material for xylene sensing applications.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Analytical
Baihe Sun, Fangjie Qin, Lin Jiang, Jun Gao, Zhuo Liu, Jue Wang, Yang Zhang, Jiahui Fan, Kan Kan, Keying Shi
Summary: A novel Co3O4/Al2O3@Ti3C2Tx MXene composite with a 3D structure and excellent gas sensing performance for NOx detection was successfully synthesized using a self-sacrificial template and hydrothermal method.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Physical
Ziyin Yang, Jinmao You
Summary: A novel Co3O4/MWCNTs/Au nanocomposite was reported for nonenzymatic glucose sensing, which achieved high sensitivity and low detection limit by enhancing electron transfer rate and improving electrocatalytic activity. The composite was synthesized by inserting MWCNTs into ZIF-67 precursor and decorating Au nanoparticles, forming a three-dimensional electrically conducting network structure.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Computer Science, Information Systems
Gagandeep Singh Walia, Parulpreet Singh, Manwinder Singh, Mohamed Abouhawwash, Hyung Ju Park, Byeong-Gwon Kang, Shubham Mahajan, Amit Kant Pandit
Summary: Location information plays an important role in the applications of Wireless Sensor Network (WSN). Traditional 2D localization methods are not reliable in 3D environments, hence the need for designing localization systems suitable for 3D environments. This paper proposes a method that uses a single anchor node to localize unknown nodes in a 3D environment, employing the Adaptive Plant Propagation Algorithm (APPA) to obtain optimized locations for the mobile nodes.
CMC-COMPUTERS MATERIALS & CONTINUA
(2022)
Article
Chemistry, Analytical
Guanglu Lei, Chengming Lou, Zishuo Li, Jiayue Xie, Guocai Lu, Hongyin Pan, Houshan Mei, Xianghong Liu, Jun Zhang
Summary: In this study, heterogeneous Co3O4/AgO nanorods were synthesized by wet-chemical method, showing remarkable response to triethylamine at low temperatures. The sensor based on Co3O4/AgO exhibited fast response time, low detection limit, good selectivity, and repeatability for TEA detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Liupeng Zhao, Rongrong Jin, Chen Wang, Tianshuang Wang, Yanfeng Sun, Peng Sun, Geyu Lu
Summary: In this study, a ZnO-Co3O4 heterostructure was successfully prepared on a nanosheet hollow sphere structure. The fabricated sensor using 3 at% ZnO-Co3O4 hollow composite showed enhanced acetone sensing performance at a low operating temperature, which was about 5.1 times higher than that of Co3O4-based sensor. Additionally, the ZnO-Co3O4 based sensor exhibited a ppb-level detection limit. The improved sensitivity and lower detection limit of the sensor can be attributed to the formation of n-p heterojunctions, which reduces the degree of band bending and surface hole concentration.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)