Article
Engineering, Chemical
M. Bielicka, U. Klekotka, O. Nowakowska, D. Satula, B. Kalska-Szostko
Summary: The paper presents the synthesis and physicochemical characterization of modified ferrite nanoparticles with doping of Al3+, Cr3+, Cu2+ and Zn2+ ions. The quality, morphology, and magnetic properties of the nanoparticles were influenced by the synthesis method and doping concentration. Two chemical methods were used to synthesize the doped nanoparticles, and various characterization techniques were employed to analyze their properties.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Shradha Roy, Mritunjoy Prasad Ghosh, Samrat Mukherjee
Summary: This study establishes the proper correlation among the microstructural, optical, and magnetic responses of Fe-doped ZnO nanoparticles. By introducing Fe ions, a decent ferromagnetic signature was observed in non-magnetic ZnO nanoparticles at room temperature, demonstrating the successful manipulation of their magnetic properties.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Muhammad Uzair, Shamsa Kanwal, Muhammad Iftikhar Khan, Wajeehah Shahid, Badriah S. Almutairi, Muhammad Amin, Nawal Ansar, Samiah Shahid, Jeong Ryeol Choi
Summary: Manganese-doped bismuth ferrites were synthesized using the coprecipitation method with the green extract Azadirachta indica. The incorporation of manganese effectively addressed the issue of increased leakage current in the ferrite material. The study analyzed the structural, dielectric, and optical properties of the materials, finding that 2% manganese doping resulted in optimal performance.
Article
Nanoscience & Nanotechnology
Yue Sun, Wenjun Lv, Yu Liang, Yuan Gao, Wenjun Cui, Yujie Yan, Wenyu Zhao, Qingjie Zhang, Xiahan Sang
Summary: By doping transition metal elements into La(Fe, Si)13 materials, the thermal stability and working temperature range of magnetocaloric materials can be improved. This study provides a new method for designing novel magnetocaloric materials.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Afsheen Farooq, Samson O. Aisida, Abdul Jalil, Chang-Fu Dee, Poh Choon Ooi, Michael Sorokin, Naila Jabeen, Ishaq Ahmad, Ting-kai Zhao
Summary: In this research, low atomic number carbon ions were used to treat titanium oxide nanoparticles and adjust their optical properties by increasing defects and reducing bandgap. The experimental results demonstrate that this method can effectively improve the optical properties of nanomaterials and expand their potential applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
F. F. H. Aragon, J. A. H. Coaquira, S. W. da Silva, R. Cohen, D. G. Pacheco-Salazar, L. C. C. M. Nagamine
Summary: The study focuses on the magnetic and electrical properties of Fe-doped indium tin oxide (ITO) and confirms the structure and properties of the material through various analysis methods. The results show that the sheet resistance increases with the Fe content, indicating a decrease in the density of conduction electrons as the iron content increases.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Optics
Siti Aishah Jupri, Sib Krishna Ghoshal, Muhammad Firdaus Omar, Khaidzir Hamzah, Nur Nabihah Yusof, Syariffah Nurathirah Syed Yaacob, Siti Khalijah Md Zain, Ibrahim Mohammed Danmallam
Summary: In this study, metal nanoparticles sensitized rare earth ions-doped magnesium zinc sulfophosphate glasses with Ag/TiO2 nanoparticles co-activation were prepared and characterized. The results showed that the optical properties of the glasses were improved by the Ag/TiO2 nanoparticles co-activation. The glass containing 0.3 mol% of TiO2 nanoparticles exhibited high stimulated emission cross-section and maximum quantum efficiency.
JOURNAL OF LUMINESCENCE
(2022)
Article
Engineering, Chemical
Alok Garg
Summary: Doping or co-doping of TiO2 nanoparticles with metal ions can modify the lattice structure and enhance their anticancer and antibacterial activities.
CHEMICAL ENGINEERING & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Chen Chu, Jinqiong Tang, Zhiyang Zhao, Yong Kong, Xiaodong Shen
Summary: In this study, Fe-doped titanium oxide-based aerogel catalysts with large specific surface area and pore volume were successfully synthesized by sol-gel method combined with thermal treatment. These catalysts exhibited excellent electrical conductivity, stability, and performance comparable to commercial Pt/C, showing great potential in promoting the scale of fuel cells.
Article
Chemistry, Physical
Jing Wang, Xiaotong Li, Yuanwen Ren, Zelin Xia, Hualin Wang, Weiwei Jiang, Chaoqian Liu, Shuang Zhang, Zhiqiang Li, Sumei Wu, Nan Wang, Guilin Liu, Shimin Liu, Wanyu Ding, Zhihua Zhang
Summary: In this study, 0.3 wt% Fe doped TiO2 nanoparticles were prepared using different types of additives, F-127 and K-30, and their effects on crystal structure and photocatalytic efficiency were investigated. It was found that F-127 inhibited the phase transformation, while K-30 promoted it, leading to differences in photocatalytic degradation under UV and visible light irradiation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Yinying Zhang, Ctirad Uher
Summary: This study investigates the influence of Fe-doping on the magnetic and transport properties of Co3Sn2S2, finding that Fe-doping suppresses magnetic order, increases electrical resistivity, contributes to the anomalous Hall effect, and causes the Kondo effect. Fe-doping also significantly reduces the magnetoresistance of Co3Sn2S2 and induces hysteresis behavior in the low magnetic field region.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
M. S. Pudovkin, R. M. Rakhmatullin, A. A. Rodionov, M. A. Cherosov
Summary: The magnetic properties of LaF3:1% Pr3+ fluoride nanoparticles were compared with bulk LaF3:1% Pr3+ crystal and microcrystalline powder using EPR and magnetization measurements along with XRD and TEM methods. LaF3:1% Pr3+ fluoride nanoparticles were synthesized by co-precipitation method and had two morphotypes: nanospheres and nanoplates. The presence of room temperature ferromagnetic-like response in magnetization measurements for nano-and microcrystalline powders suggests that surface defects play a key role in the observed magnetization dependence on the magnetic field.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Polymer Science
Tinoco Navarro Lizeth Katherine, Bednarikova Vendula, Kastyl Jaroslav, Cihlar Jaroslav
Summary: TiO2 aerogels doped with Ni, Co, Cu, and Fe were studied for their structure and photocatalytic activity in the decomposition of acid orange (AO7). The doped aerogels were evaluated and analyzed after calcination at 500°C and 900°C. XRD analysis showed the presence of anatase/brookite and rutile phases, along with other oxide phases from the dopants. SEM and TEM microscopy revealed the nanostructure of the aerogels, and BET analysis showed their mesoporosity and high specific surface area. Photocatalytic activity was assessed using UV spectrophotometry and photodegredation of AO7, with Ni-TiO2 and Cu-TiO2 aerogels calcined at 500°C exhibiting higher photoactivity coefficients than those calcined at 900°C.
Article
Materials Science, Multidisciplinary
H. H. Nguyen, W. H. Jeong, T. L. Phan, B. W. Lee, D. S. Yang, N. Tran, N. T. Dang
Summary: The study focuses on the structural characterization, valence change of Fe, Raman spectra, and magnetic and microwave shielding properties of polycrystalline SrFe12-xZnxO19 (x = 0-1) samples. The Zn doping caused notable changes in the lattice constants, saturation magnetization, and coercive force of the samples. Additionally, the analysis revealed that both dielectric and magnetic losses contribute to the microwave-absorption properties of SrFe12-xZnxO19.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Materials Science, Ceramics
P. Anilkumar, T. Kalaivani, S. Deepak, J. Jasmin, A. F. Abd El-Rehim, E. Ranjith Kumar
Summary: The optical, structural, electrical, and gas-sensing properties of pure and lanthanum-doped TiO2:La nanoparticles were investigated in this study. The synthesized material exhibited a tetragonal phase with preferential orientation of (101) based on X-ray diffraction measurements. The UV spectra revealed high reflectance (>80%) in the visible area for all samples, with a band gap between 3.49 and 3.4 eV that increased by up to 7.5% with the addition of La. TEM analysis showed TiO2:La nanoparticles with a typical crystallite size of 7 nm. The presence of oxygen vacancies in the synthesized TiO2:La sample was confirmed by PL spectra.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Izabell Craciunescu, Elena Chitanu, Mirela M. Codescu, N. Iacob, A. Kuncser, V. Kuncser, V. Socoliuc, Daniela Susan-Resiga, Florica Balanean, G. Ispas, Tunde Borbath, I. Borbath, Rodica Turcu, L. Vekas
Summary: High magnetization Fe3O4/OA-FeCo/Al2O3 nanocomposite magnetic clusters were successfully synthesized via a modified oil-in-water miniemulsion method. These clusters, with a combination of magnetite nanoparticles and FeCo/Al2O3 particles, exhibited enhanced magnetic and flow properties in ferrofluid carrier. The unique structure and composition of the Fe3O4/OA-FeCo/Al2O3 clusters contribute to their promising performance as a new type of nanocomposite magnetorheological fluid, as demonstrated by advanced characterization techniques.
Article
Materials Science, Ceramics
Sara Ait Bouzid, Abdellatif Essoumhi, Arpad Mihai Rostas, Andrei Cristian Kuncser, Constantin Catalin Negrila, Nicusor Iacob, Andrei Galatanu, Bogdan Popescu, Mohammed Sajieddine, Aurelian Catalin Galca, Victor Kuncser
Summary: Poly-crystalline La(0.8)K(0.2-x)Pb(x)MnO3 (x = 0.05, 0.10, 0.15, 0.20) ceramics were successfully prepared by flash combustion route and their structural, morphological, magnetic and magnetocaloric properties were investigated. Results showed that Pb doping changes the grain size and lattice parameters without modifying the crystal structure. La0.8K0.1Pb0.1MnO3 exhibited significant magnetocaloric properties near room temperature.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
A. Birsan, V Kuncser
Summary: The research efforts in this study focused on implementing Heusler materials into spintronic heterostructures, specifically investigating the half-metallic and magnetic properties of Zr2CrAl ferrimagnetic compound. Theoretical investigations using Density Functional Theory were conducted on different distortions of the inverse-Heusler cubic crystalline structure. The results showed that the compound exhibited half-metallic characteristics for all considered distortions, and the slight variations in unit cell volume did not affect its high spin polarization state. The calculated magnetic moment per formula unit followed the Slater-Pauling rule, and the antiferromagnetic coupling between Zr and Cr atoms was preserved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Analytical
Corneliu Ghica, Catalina G. Mihalcea, Cristian E. Simion, Ioana D. Vlaicu, Daniela Ghica, Ion V. Dinu, Ovidiu G. Florea, Adelina Stanoiu
Summary: This paper aims to identify the interaction mechanism between CO2 and chemical sensors based on Gd-doped SnO2, SnO2, and Gd2O3 powders. The presence of humidity can offset the low reactivity of CO2. Gd concentration was varied to determine the limit for Gd integration as a doping ion. The change in electrical resistance is influenced by the density of oxygen vacancies or compensation for opposite behaviors in the SnO2-Gd2O3 nanocomposite structure. CO2 exposure to humidity leads to specific chemical interactions on the surfaces of SnO2 and Gd2O3.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Adelina Stanoiu, Corneliu Ghica, Catalina G. Mihalcea, Daniela Ghica, Simona Somacescu, Ovidiu G. Florea, Cristian E. Simion
Summary: By varying the calcination temperature, the crystallinity and surface chemistry of synthesized NiO materials can be controlled, thus affecting their CO sensing mechanism.
Article
Chemistry, Multidisciplinary
Luminita Andronic, Daniela Ghica, Mariana Stefan, Catalina Gabriela Mihalcea, Aurel-Mihai Vlaicu, Smagul Karazhanov
Summary: Recently, there has been a focus on surface-defective titanium dioxide and black TiO2 due to their advanced optical, electrical, and photocatalytic properties. The synthesis of these materials for the degradation and mineralization of organic pollutants in water, especially under visible light, has attracted attention from both scientific and application perspectives. Chemical reduction by heating a TiO2 and NaBH4 mixture successfully introduced Ti3+ defects and oxygen vacancies at the surface of TiO2, enhancing its photocatalytic degradation efficiency for amoxicillin. Annealing temperature and reduction method play a crucial role in determining the properties of the TiO2 samples.
Article
Materials Science, Multidisciplinary
Cornel Staicu, Claudiu Locovei, Andrei Alexandru Dinu, Ion Burducea, Bogdan Butoi, Oana Gloria Pompilian, Corneliu Porosnicu, Cristian Petrica Lungu, Victor Kuncser
Summary: This study closely analyzes the morphology, structure, and magnetic properties of approximately 100 nm thick Fe-B thin coatings, with a nominal B content ranging from 5% to 50%. Mossbauer Spectroscopy is proven to have a high capability in providing the phase composition and B content in the formed Fe-B intermetallic films, in correlation with other techniques, to explain their magnetic properties.
Article
Materials Science, Multidisciplinary
Anda Elena Stanciu, Gabriel Schinteie, Andrei Cristian Kuncser, Claudiu Locovei, Lucian Trupina, Nicusor Iacob, Aurel Leca, Bogdana Borca, Victor Kuncser
Summary: This study investigates the vectorial magnetic properties of nanostructured systems and thin films of Fe and FeCo. The magnetic properties are engineered by controlling the parameters of the thin films. Magnetic nanowires and magnetic islands/clusters are distinguished on undulating thin films.
Article
Chemistry, Physical
Marwene Oumezzine, Cristina Florentina Chirila, Iuliana Pasuk, Aurelian Catalin Galca, Aurel Leca, Bogdana Borca, Victor Kuncser
Summary: In this study, a ferromagnetic perovskite thin film was successfully grown on a single crystal substrate, and its magnetic, magnetocaloric, and magnetoresistance properties were investigated. The film exhibited high crystallinity and in-plane uni-axial magnetic anisotropy, showing a ferromagnetic-paramagnetic phase transition and a metal-semiconductor transition near room temperature.
Editorial Material
Chemistry, Multidisciplinary
Victor Kuncser
Summary: Multifunctional magnetic nanocomposites are heterogeneous nanosized systems with at least one magnetic phase component, which can act as an intermediate for the actuation or response of the overall system. The electronic properties of the constituent interfaced nanophases can be combined and influenced in these systems, resulting in unique physico-chemical properties for various applications.
Article
Chemistry, Multidisciplinary
Luiza Izabela Toderascu, Livia Elena Sima, Stefana Orobeti, Paula Ecaterina Florian, Madalina Icriverzi, Valentin-Adrian Maraloiu, Cezar Comanescu, Nicusor Iacob, Victor Kuncser, Iulia Antohe, Gianina Popescu-Pelin, George Stanciu, Petre Ionita, Cristian N. N. Mihailescu, Gabriel Socol
Summary: In this study, L-Cysteine-coated magnetic iron oxide nanoparticles loaded with doxorubicin were synthesized and extensively characterized. The binding of doxorubicin to L-Cysteine was confirmed, and the internalization of the nanoparticles delivering doxorubicin was observed in melanoma cells. The nanoparticles also modulated cell signaling pathway activity, induced cell cycle arrest and apoptosis, and exhibited pH-dependent drug release. These results demonstrate the potential of the nanoparticles as efficient drug delivery vehicles in melanoma therapy.
Article
Chemistry, Analytical
Adelina Stanoiu, Corneliu Ghica, Catalina Gabriela Mihalcea, Daniela Ghica, Cristian Eugen Simion
Summary: In this study, two alternative synthesis routes were used to obtain gas-sensitive NiO materials. The structural and morphological aspects were systematically investigated, revealing significant differences in their sensing performances. The study considered multiple energy contributions and proposed two sensing mechanisms to explain the variation in CO sensor response, with the influence of relative humidity also taken into account.
Article
Chemistry, Multidisciplinary
Ioana D. Vlaicu, Mariana Stefan, Cristian Radu, Daniela C. Culita, Dana Radu, Daniela Ghica
Summary: This study prepared nanocrystalline zinc hydroxynitrate (ZHN) doped with 1,000 ppm Mn2+ using two synthesis methods and found that the two ZHN nanopowders had similar crystalline structures but differences in their morphological and textural characteristics, as well as in the doping efficiency. The thermal stability and structural phase transformation of ZHN were investigated by electron paramagnetic resonance (EPR), which showed that the transformation temperature decreased due to the doping of Mn2+. These results are important for selecting the appropriate ZHN synthesis method for specific applications and developing new green, cost-effective synthesis routes for Mn2+ doped nano-ZnO.
FRONTIERS IN CHEMISTRY
(2023)
Article
Chemistry, Physical
Ileana Cristina Vasiliu, Ana Violeta Filip, Irinela Chilibon, Mihail Elisa, Cristina Bartha, Victor Kuncser, Aurel Leca, Lucica Boroica, Bogdan Alexandru Sava, Roxana Trusca, Mihai Eftimie, Adrian Nicoara
Summary: This study investigates a convenient and low-cost sol-gel approach for synthesizing ZnO-P2O5-rGO nanostructures with tuned bandgap and fluorescence. The obtained hybrid nanostructures combine the properties of zinc oxide, graphene oxide, and phosphorous oxide, making them promising candidates for a wide range of optoelectronic applications.
Review
Chemistry, Multidisciplinary
V Socoliuc, M. Avdeev, V Kuncser, Rodica Turcu, Etelka Tombacz, L. Vekas
Summary: Ferrofluids are colloidal suspensions of magnetic nanoparticles with fluid and magnetic properties, which have been investigated for over five decades. They have proven to be highly controllable and tunable, making them suitable for a wide range of engineering applications. Recently, biocompatible ferrofluids have attracted significant interest for their potential applications in nanomedicine, biotechnology, and environmental protection. This paper provides an overview of early results, as well as recent advancements in ferrofluid synthesis, characterization, ferrohydrodynamics, and applications in sensors, actuators, and droplet technology.
