Article
Chemistry, Physical
Xueyun Zhou, Jun Wang, Dongsheng Yao
Summary: In this study, RE0.01Ni0.3Zn0.4Mn0.3Fe2O4 (RE=Fe, La, Nd, Sm, Gd, Dy, Yb) ferrites with precisely controlled composition were prepared. It was found that the lattice constant decreases with the increase of atomic number of rare earth. The infrared spectra showed changes in the tetrahedral and octahedral bonds. The introduction of rare earth slightly reduced the saturation magnetization and initial permeability, but had the same effect on Ms. These ferrites exhibited spin glass state or superparamagnetism at high temperature, and Sm, Gd, and Dy doped ferrites displayed unique dielectric properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Majid Niaz Akhtar, Muhammad Yousaf, Yuzheng Lu, Muhammad Azhar Khan, Ali Sarosh, Mina Arshad, Misbah Niamat, Muhammad Farhan, Ayyaz Ahmad, Muhammad Umar Khallidoon
Summary: In this study, rare-earth (RE) elements Yb and Gd doped Ni-Zn ferrite samples were prepared and their magnetic, optical, and electrical properties were investigated. The results showed that the samples exhibited excellent magnetooptical and electrical properties, making them promising for applications in nanoantennas, quantum information, sensing, isolators, modulators, data storage, and energy storage devices.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Inorganic & Nuclear
J. Lakshmikantha, G. Krishnamurthy, B. M. Nagabhushan, E. Melagiriyappa
Summary: Nanosized M-type hexaferrites Sr(1-x)GdxFe12O19 were synthesized and the influences of Gd3+ ions substitution on their structural, electrical and magnetic properties were investigated. The study found that increasing Gd3+ ion content resulted in larger lattice parameters, decreased dielectric constant, increased AC conductivity, and decreased magnetic parameters. In addition, vibrating sample magnetometer analysis confirmed the hard magnetic behavior of M-SrHF.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Materials Science, Ceramics
Jie Fu
Summary: PNb9O25 ceramic was prepared using the sparking plasma sintering (SPS) method. The ceramic exhibited high dielectric constant, low dielectric loss, and high electrical conductivity, showing stable performance within a certain temperature range.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Inorganic & Nuclear
Jing Feng, Yu Zhang, Chuang Yang, Nan Wang, Fengwan Guo, Chi Zhang, Juan Wang
Summary: Two Keggin-type polyoxometalates-based rare-earth metal-organic networks were synthesized, exhibiting similar 2D layer structures; the incorporation of Keggin-anions was found to play an important role in the fast capture of cationic dye.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Environmental Sciences
Umesh Chejara, Anamika Prajapati, Arvind Kumar
Summary: This study synthesized and characterized nano-particles of polycrystalline magnesium and iron ferrite doped with rare earth materials. The electrical properties of these materials were measured, and it was found that they exhibit variation behavior with respect to frequency. The study suggests that these materials may have potential applications in the fabrication of microwave antennas to reduce energy losses.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Materials Science, Ceramics
Wangzhe Leng, Guoxi Wan, Yanyu Liu, Rui Ma, Yi Du
Summary: The new designed ceramics (0.96-x)(K0.48Na0.52Nb0.96Sb0.04)O-3-0.04(Bi0.5Ag0.5)ZrO3-x(Fe2O3-In2O3) exhibit high dielectric and electromechanical coupling properties. The influence of lattice distortion (c/a) and microstructure on the electrical properties is explored by varying the doping amount of Fe3+ and In3+. The introduction of Fe3+ and In3+ effectively solves the issue of oxygen vacancies caused by the volatilization of K and Na, leading to increased bulk density and improved piezoelectric and dielectric properties.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Abdul Hakeem, Thamraa Alshahrani, Ghulam Muhammad, M. H. Alhossainy, A. Laref, Abdul Rauf Khan, Irshad Ali, Hafiz Muhammad Tahir Farid, T. Ghrib, Syeda Rabia Ejaz, Rabia Yasmin Khosa
Summary: The study focused on the effects of ytterbium doping on structural, electrical and magnetic properties of Mn-ferrites, demonstrating an increase in coercivity and a decrease in remanence and saturation magnetization. Ytterbium incorporation also led to a reduction in both real and imaginary parts of permittivity, while enhancing the impedance of the ferrite lattice. The results suggest that these compounds are suitable for microwave absorption applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Physics, Multidisciplinary
Zhao-Gen Long, Chen-Ping Zheng, Jian-Chang Li
Summary: The study revealed that introducing high-kappa ZrO2 in rare-earth/high-kappa CeO2/ZrO2 films can enhance electrical performance, including lower set voltage, higher ON/OFF ratio, longer retention time, and greater uniformity. This is attributed to the stable formation and rupture of conductive filaments, facilitated by the larger dielectric constant of ZrO2 preventing Ce-O bonds from formation/rupture.
Article
Polymer Science
Weikai Sun, Minhao Yang, Kun Peng, Yaqin Fu
Summary: The demand for high-speed communication at high frequency has led to the development of low-dielectric polymer films. Aromatic polyimide (PI) is commonly used in flexible circuit boards due to its excellent properties, but its dielectric constant is relatively high for high-frequency communication. To address this, a hyper-crosslinked polymer (HCP) was synthesized and blended with PI to form all-organic HCP/PI composite films. The porous structure of HCP helps to reduce the dielectric constant of the PI matrix. By adjusting the HCP content, the dielectric constant of the composite films can be effectively lowered in the desired frequency range. This method is simple and can be applied to other organic component-filled PI systems.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Tomoki Murata, Toru Asaka, Sakyo Hirose
Summary: Dielectric tunability has been extensively studied in ferroelectric materials, with negative tunability being common and positive tunability rare. However, titanite CaTiSiO5 demonstrates both positive and negative tunability, suggesting unique behavior in high electric fields compared to conventional antiferroelectrics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
A. Srour, Z. Bitar, K. Badreddine, R. Awad
Summary: Samarium iron garnet co-doped with Gd3+ and Pr3+ ions was synthesized and characterized. The co-doping process affected the structural, optical and electrical properties of the material. The co-doped samples showed promise for applications in transparent electrodes, optoelectronic devices, and ion-conducting glasses and crystals.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Zhen Li, Xiao-Bao Li, Mark E. Light, Anna E. Carrillo, Ana Arauzo, Manuel Valvidares, Claudio Roscini, Francesc Teixidor, Clara Vinas, Felipe Gandara, Elena Bartolome, Jose Giner Planas
Summary: This work demonstrates the successful synthesis of a multi-metallic MTV RE MOF incorporating two, four, six, or eight different RE ions without any compositional segregation. The incorporation of all RE cations is characterized via compositional and structural characterization. The more complex MTV MOF, including all eight RE ions, is characterized using optical, thermal, and magnetic techniques.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Khoe Van Nguyen, Shih-Yen Lin, Yia-Chung Chang
Summary: The transfer characteristics of p-doped graphene/monolayer-MoS2 heterostructure at 300 K were experimentally measured and analyzed based on a model calculation. The Poisson equation was discretized into multiple zones, and the Boltzmann transport equation was solved in the relaxation-time approximation using inelastic acoustic phonon scattering in the model. The relationship between the Dirac voltage and the Fermi energy was derived, and the results obtained without and with optical pumping agreed well with experimental data.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Review
Polymer Science
Zhenjiang Pang, Hengchao Sun, Yan Guo, Jun Du, Liang Li, Qiuyang Li, Junzhong Yang, Jijun Zhang, Weiguo Wu, Sen Yang
Summary: With the growth of the microelectronics industry, the need for interlayer insulation materials with low dielectric constant (k) has gained significant attention. This study reviews the development of porous PI-based composites aimed at reducing the dielectric constant. It emphasizes the application of porous SiO2, graphene derivatives, polyoxometalates, polyhedral oligomeric silsesquioxane, and hyperbranched polysiloxane in achieving low k PI.
Article
Chemistry, Multidisciplinary
Shamraiz Hussain Talib, Zhansheng Lu, Beenish Bashir, Sajjad Hussain, Khalil Ahmad, Salahuddin Khan, Sajjad Haider, Zongxian Yang, Kersti Hermansson, Jun Li
Summary: This study systematically investigates the catalytic activity and stability of single noble metal atom catalysts supported on MXene materials for CO oxidation. The results show that CO oxidation mainly proceeds via the TER mechanism under mild reaction conditions. Ru1- and Ir1@Mo2CS2 exhibit high activity and catalytic stability.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Physical
Amna Irshad, H. H. Somaily, Sonia Zulfiqar, Muhammad Farooq Warsi, Muhammad Imran Din, Khadija Chaudhary, Muhammad Shahid
Summary: In this study, NiAl2O4 and silver doped NiAl2O4 were synthesized using a sol-gel approach, and their composite with g-C3N4 was successfully prepared through ultrasonication. The characterization of the fabricated materials was done using various techniques, and the electrochemical behavior of the fabricated electrode materials was investigated using electrochemical techniques. The results showed that Ag-NiAl2O4@g-C3N4 nanocomposite was a more active electrode material compared to the other prepared electrodes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Nusrat Shaheen, Muhammad Farooq Warsi, Sonia Zulfiqar, Jalal T. Althakafy, Abdullah K. Alanazi, Muhammad Imran Din, Hala M. Abo-Dief, Muhammad Shahid
Summary: The hydrothermal approach was used to synthesize gCN supported carbon coated Lanthanum doped tungsten oxide (C@LWO/gCN) composite. The photodegradation of malachite green (MG), crystal violet (CV), and methylene blue (MB) cationic dyes was carried out using the prepared C@LWO/gCN composite. Characterization techniques such as XRD, FESEM, EDX, FTIR, BET, and UV/Vis spectroscopy were used to analyze the synthesized samples. The results showed that the incorporation of La ions into WO3 lattice and the reduced band gap of the doped sample significantly enhanced the photodegradation capability of the material.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Mehwish Akhtar, Safaa N. Abdou, Tahreem Abdullah, M. H. H. Mahmoud, Zarnish Sabir, Zafar A. K. Khattak, Shagufta Zafar, Sonia Zulfiqar
Summary: The rGO-supported C@Nd2O3 photocatalyst was synthesized using a facile chemical approach and ultrasound radiations to enhance its photocatalytic performance. The synthesized samples were characterized for crystal structure, surface morphology, and chemical composition using UV, XRD, FT-IR, and FESEM. The ternary composite C@Nd2O3/rGO exhibited higher photocatalytic activity than C@Nd2O3, with a 90.93% removal of the dye under 60 min of UV exposure. The improved photocatalytic efficiency can be attributed to the heterojunction formation, high charge separation, and low recombination rate of photogenerated electron-hole pairs.
Article
Materials Science, Multidisciplinary
Mamoona Anwar, Kawthar Saad Alghamdi, Sonia Zulfiqar, Muhammad Farooq Warsi, Muhammad Waqas, Murtaza Hasan
Summary: The most promising strategy for environmental preservation and wastewater treatment is the creation of semiconductor-based photocatalysts. This study focused on fabricating bismuth oxychloride (BiOCl) and silver-decorated bismuth oxychloride (Ag@BiOCl) using a co-precipitation method, and synthesizing a composite of silver-decorated bismuth oxychloride with graphitic carbon nitride sheets (Ag@BiOCl/g-C3N4) through ultrasonication. The photocatalysts were characterized using various techniques, and their efficiency in water treatment and antimicrobial properties were evaluated.
Article
Physics, Condensed Matter
Anza Farooq, Mamoona Anwar, H. H. Somaily, Sonia Zulfiqar, Muhammad Farooq Warsi, Muhammad Imran Din, Ayyaz Muhammad, Amna Irshad
Summary: Magnesium aluminate (MgAl2O4, MAO) and silver doped magnesium aluminate (Ag-MgAl2O4, Ag-MAO) nanomaterials were synthesized using co-precipitation technique. Reduced graphene oxide composite (Ag-MgAl2O4@rGO, Ag-MAO@rGO) was prepared by ultrasonication method for photocatalytic degradation of crystal violet (CV) and phenol in organic effluents. The formation of doped and bare MgAl2O4 was confirmed by XRD, identified functional groups using FTIR, morphology observed by SEM, and optical analysis performed using UV-Visible spectrophotometer. Ag-MAO@rGO exhibited 81.89% CV degradation and 40.51% phenol degradation under sunlight, with hydroxyl radicals as the principal photoactive species.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Ceramics
Tehmina Kousar, Khadijah Mohammedsaleh Katubi, Sonia Zulfiqar, Z. A. Alrowaili, Mohd Zahid Ansari, M. S. Al-Buriahi, Muhammad Aadil, Warda Hassan, Farzana Mahmood, Mehtab Hussain
Summary: Cobalt-nickel mixed ferrite (CNFO) and gadolinium doped cobalt-nickel mixed ferrite (G-CNFO) materials were synthesized using the microemulsion technique. The physicochemical features of the materials were examined, and G-CNFO showed better photocatalytic activity than CNFO under visible light. The optimal parameters for G-CNFO's catalytic properties were investigated, and its enhanced photocatalytic activity was attributed to its tuned band structure, high light harvesting abilities, reduced electron-hole recombination, and nanostructured morphology.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Sheraz Yousaf, Khadijah Mohammedsaleh Katubi, Sonia Zulfiqar, Muhammad Farooq Warsi, Z. A. Alrowaili, M. S. Al-Buriahi, Iqbal Ahmad
Summary: This article presents a novel 2D iodine-doped Ni0.5Co0.5 layered double hydroxide (LDH) catalyst for the oxygen evolution reaction (OER), which exhibits exceptional OER performance with lower overpotential and higher stability. The iodine-doped Ni0.5Co0.5 LDH catalyst possesses abundant active sites, lower charge transfer resistance, induced oxygen vacancies, and increased pore size to pore diameter ratio.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Shakeel Ahmed, Muhammad Ashraf, Sheraz Yousaf, Ibrahim A. Alsafari, Mehwish Akhtar, Muhammad Shahid, H. H. Somaily, Muhammad Farooq Warsi
Summary: This study demonstrates the fabrication and performance of glucose sensor based on zinc oxide nanoparticles (ZnO NPs) and their composite. ZnO nanostructures possess fascinating properties like large surface area, superior crystal nature and good electrical as well as optical properties. The prepared iron doped ZnO/rGO based composite showed greater sensitivity and electrocatalytic activity than other compositions considered in this study.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Muhammad Afaq, Beriham Basha, Muhammad Farooq Warsi, Muhammad Shahid, Z. A. Alrowaili, M. S. Al-Buriahi, Sheraz Yousaf
Summary: Copper ferrite (CuFe2O4), zinc oxide (ZnO), and the zinc oxide-copper ferrite binary composite were prepared using wet chemical precipitation method. A ternary composite (ZnO-CuFe2O4/CNTs) was also prepared using ultrasonic treatment method for photocatalytic degradation of chemical pollutants. XRD, UV-visible spectroscopy, SEM, and FT-IR were used to analyze the fabricated catalysts. The photocatalytic performance of the prepared samples was observed under sunlight, with 61% benzoic acid and 82% congo red being degraded in 120 min. The ZnO-CuFe2O4/CNT ternary NC showed superior photocatalytic efficiency compared to pure ZnO and CuFe2O4. Hydroxyl radicals were found to be the main species responsible for the photocatalytic degradation of organic contaminants.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Khadijah Mohammedsaleh Katubi, Al-Zoha Warsi, Fatima Aziz, Zafar A. K. Khattak, Muhammad Farooq Warsi, M. S. Al-Buriahi, Z. A. Alrowaili, Sheraz Yousaf
Summary: This study focuses on hydrogen production through electrocatalysis using a newly synthesized and characterized nano-hybrid composite electrocatalyst. The electrocatalyst consists of mixed metal oxides and reduced graphene oxide. Various characterization techniques were used to evaluate the structural and morphological characteristics of the electrocatalyst. Electrochemical methods, including linear sweep voltammetry, Tafel slope, and electrochemical active surface area measurements, provided valuable insights into the catalytic efficiency and effectiveness of the electrocatalyst for the hydrogen evolution reaction. The findings demonstrate that the electrocatalyst WO3-CuO/rGO exhibits exceptional catalytic efficiency, with a current density of 200 mA/cm2 at an overpotential of -400 mV, a Tafel slope of 44 mVdec(-1), and low charge transfer resistance. Furthermore, chronoamperometric analysis confirms the electrocatalyst's durability and potential for practical applications.
CURRENT APPLIED PHYSICS
(2023)
Article
Energy & Fuels
Muhammad Usman Khalid, Khadijah Mohammedsaleh Katubi, Sonia Zulfiqar, Z. A. Alrowaili, Muhammad Aadil, M. S. Al-Buriahi, Muhammad Shahid, Muhammad Farooq Warsi
Summary: A novel Ag-MnO2/MXene@NF electrode was developed by incorporating hydrothermal and post-sonication processes to boost its overall activity. Ag-doping and MXene reinforcement improved the conductivity of MnO2, while the sandwiching of Ag-MnO2 NWs between MXene sheets resulted in a hetero-structured composite with superb conductivity and high surface area. The nanostructured and spongy structure of Ag-MnO2/MXene@NF allowed for higher capacitance, impressive rate capability, and superb cyclic activity, making it suitable for advanced energy storage devices.
Article
Materials Science, Multidisciplinary
Iqra Mustafa, Beriham Basha, Sonia Zulfiqar, Amiza Tahir, Farzana Hanif, M. S. Al-Buriahi, Mehwish Akhtar, Khadija Chaudhary
Summary: L-Cysteine functionalized Ag@MnO2 nanocomposite was synthesized using a hydrothermal method for electrochemical sensing of heavy metal ions (HMIs). Advanced techniques were employed to characterize the composition and morphology of L-Cys/Ag@MnO2. The optimized sensor exhibited high sensitivity towards Cd+2 and Pb+2 ions with LOD of 0.065 nM and 0.052 nM, respectively. The practical applicability of the sensor was also demonstrated in tap water, showing its potential for sensing other toxic metal ions in real samples.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Muhammad Usman Khalid, Maryam Al Huwayz, Sonia Zulfiqar, Eric W. Cochran, Z. A. Alrowaili, M. S. Al-Buriahi, Muhammad Farooq Warsi, Muhammad Shahid
Summary: This study investigates ultralong MnO2 nanowires reinforced with different Cu contents as a new electrode material for supercapacitors. XRD results showed phase transformation of MnO2 from alpha-MnO2 to beta-MnO2 induced by Cu doping. Ultralong nanowires with interconnected network enhance electron transport and electrical conductivity. CV profile and rate law confirmed preferred charge storage follows faradic mechanism. Nanosized morphology and spongy structure of current collector maximize electrode area and protect from pulverization.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Muhammad Afaq, Muhammad Shahid, Iqbal Ahmad, Sheraz Yousaf, Amira Alazmi, M. H. H. Mahmoud, Islam H. El Azab, Muhammad Farooq Warsi
Summary: A mixed-phase Co3O4-CoFe2O4@MWCNT nanocomposite was synthesized through a large-scale and cheap ultrasonication followed by annealing. The synthesized catalysts were characterized through XRD, FTIR, and SEM, and then tested for bifunctional electrocatalytic activity. The Co3O4-CoFe2O4@MWCNT nanocomposite showed higher current density and smaller Tafel slope compared to Co3O4-CoFe2O4, due to the uniform incorporation of Co3O4-CoFe2O4 and the enhanced electrochemical active surface of MWCNTs. The results demonstrate the potential of the synthesized nanocomposite for high-potential energy applications.
