Article
Chemistry, Inorganic & Nuclear
Abdelaziz Abboudi, Sabrina Iaiche, Abdelkader Djelloul, Abdelouahed Chala, Fouzi Kezzoula, Faycal Bensouici, Mohamed Bououdina, Muhammad Humayun
Summary: Bare titanium oxide (TiO2) and fluorine (F) doped TiO2 thin films were successfully fabricated on soda lime glass substrates using the sol-gel dip-coating technique. The influence of hydrofluoric acid (HF) concentration on the structural, optical, and photocatalytic properties of the films was investigated. Characterization techniques such as X-ray diffraction, scanning electron microscopy, X-ray photo-electron spectroscopy, energy dispersive X-ray spectroscopy, atomic force microscopy, and UV-visible spectrophotometry were employed. The results showed the presence of highly crystalline anatase phase TiO2, cracked surfaces in the SEM images, and a decrease in roughness with increasing HF concentration in the AFM images.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Environmental Sciences
Lingsheng Wang, Weizhang Fu, Yuping Zhuge, Jun Wang, Fanfeng Yao, Wanzhen Zhong, Xiaohong Ge
Summary: A sandwich-type polyoxometalate Na [alpha-SiW9O34] was synthesized and SiW9/TiO2/Cu composite was prepared for the catalytic reduction of nitrate. The prepared composite catalyst showed better photocatalytic activity than TiO2, achieving 76.53% nitrate removal with 82.09% N-2 selectivity under specified conditions.
Article
Materials Science, Multidisciplinary
Lucia Rossi, Paula I. Villabrille, Sergio Morales-Torres, Janina A. Rosso
Summary: In this study, palladium-modified titanium dioxide powder photocatalysts were prepared using the sol-gel method. The materials were characterized and their photocatalytic activity for phenol degradation under UV and visible irradiation was tested. The optimal palladium content was determined to be 0.10% atomic Pd, achieving 100% phenol degradation under UV irradiation and 68% under visible irradiation. The immobilization of the material on glass slides using the dip-coating method was also studied, showing promising photocatalytic activity for phenol degradation using solar irradiation.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Massimo Zimbone, Maria Cantarella, Giuliana Impellizzeri, Sergio Battiato, Lucia Calcagno
Summary: This paper discusses the structural and photochemical properties of a monolithic photochemical diode. Through the optimization of TiO2 nanowires and Pt nanoparticles, an improved photo-activity and photocatalytic degradation rate were achieved.
Article
Engineering, Chemical
Fang Yuan, Renfeng Yang, Chunquan Li, Xiangwei Zhang, Zhiming Sun
Summary: In this study, three types of bismuth semiconductors were selected to construct heterojunctions with titania supported on diatomite for improving photocatalytic performance under visible light. The Bi2MoO6-TiO2/diatomite composite showed the highest performance, with a mineralization rate of 47.58 times that of the TiO2/diatomite composite. The performance enhancement mechanism was attributed to the relatively high quantum efficiency of the heterojunctions, resulting in a higher generation efficiency of active radicals.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Physical
Aleksandra Piatkowska, Sylwia Mozia
Summary: A series of novel non-metal doped TiO2 photocatalysts were obtained using a simple wet impregnation-calcination method, with crucial factors affecting photocatalytic activity being the anatase to rutile phase ratio, anatase crystallites size, and non-metals content. The photocatalysts exhibited improved activity in ketoprofen decomposition compared to crude TiO2, with the best photoactivity observed in a photocatalyst composed of 96.4% anatase calcined in air at 600 degrees C with specific non-metals content.
Article
Chemistry, Applied
Vyacheslav I. Supranovich, Vitalij V. Levin, Vladimir A. Kokorekin, Alexander D. Dilman
Summary: Thiols react with alpha-(trifluoromethyl)styrenes under photocatalytic conditions, leading to desulfurative allylic fluorine substitution and formation of gem-difluorostyrenes.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Article
Chemistry, Physical
Yujing Guo, Chao Pei, Sripati Jana, Rene M. Koenigs
Summary: Trifluoromethylated aziridines are important strategic building blocks with broad applications in drug discovery. This study demonstrates that iodinanes can release a nitrene radical anion in the presence of a simple Ru(bpy)(3)Cl-2 catalyst, allowing for direct aziridination reactions of fluorinated olefins.
Article
Chemistry, Physical
Chuangwei Liu, Derek Hao, Jin Ye, Sheng Ye, Fengling Zhou, Hongbo Xie, Gaowu Qin, Jiating Xu, Jian Liu, Song Li, Chenghua Sun
Summary: The room-temperature nitrogen reduction reaction (NRR) has great importance in the fertilizer industry and fundamental catalysis science. This study demonstrates the knowledge-driven design of boron-doped TiO2 as a photocatalyst for NRR. Among 54 catalysts, boron-doped anatase TiO2(101) is identified as an exceptional NRR catalyst with strong visible-light absorption and excellent reactivity. Experimental validation shows that B-doped TiO2 nanosheet achieves high ammonia production under simulated sunlight, renewing the performance record for Ti-based photocatalysts for NRR. This work highlights the importance of dual active site catalysts for nitrogen activation and reduction and demonstrates the capacity of knowledge-driven catalyst design.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Applied
Alexander Yu. Vakhrushev, Tatiana B. Boitsova
Summary: The study presents a method for synthesizing TiO2 and TiO2/Ag fibers with anatase-rutile-silver heterojunction, using alcohol solutions of titanium(IV) tetrabutoxide and silver nitrate on a cellulose template, followed by annealing. The microstructure and photocatalytic activities of the fibers were analyzed, showing that mixed-phase samples (40% rutile and 60% anatase) exhibited the highest catalytic activity.
JOURNAL OF POROUS MATERIALS
(2021)
Article
Chemistry, Applied
Thibaut Duhail, Samir Messaoudi, Guillaume Dagousset, Jerome Marrot, Christiane Andre-Barres, Emmanuel Magnier, Elsa Anselmi
Summary: We prepared S-perfluoroalkyl benzodithiazole trioxides as radical perfluoroalkylating reagents. The synthesis of these compounds was achieved on a multi-gram scale through oxidative cyclization. The structures and properties of the molecules were investigated using X-Ray diffraction, DFT calculations, and cyclic voltammetry. The enhanced reactivity of the cyclic sulfoximines compared to their open analogues was confirmed by photoredox catalysis experiments.
ADVANCED SYNTHESIS & CATALYSIS
(2023)
Article
Engineering, Environmental
Spela Slapnicar, Gregor Zerjav, Janez Zavasnik, Matjaz Finsgar, Albin Pintar
Summary: This study investigated the plasmonic Au (1 wt%) catalysts on hydrothermally synthesized TiO2 nanorods. Different sizes of Au nanoparticles (Au NPs) on Au/TiO2 catalysts were obtained by adjusting the mixing duration and calcination parameters. The presence of localized surface plasmon resonance effect was observed in all UV-Vis diffuse reflectance spectra of the catalysts, regardless of the size of Au particles. The study also identified superoxide anion radicals (O2 & BULL;-) as the main reactive oxygen species responsible for the oxidation of bisphenol A (BPA) under visible-light illumination.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Review
Polymer Science
Wen-Bo Li, Yuan-Zhe Cheng, Dong-Hui Yang, Yu-Wen Liu, Bao-Hang Han
Summary: This article reviews the synthesis and application of fluorine-containing covalent organic frameworks (fCOFs), which have been utilized in various fields including catalysis, adsorption, separation, and energy storage. The introduction of fluorine enhances the performance and stability of COFs, making them promising for diverse applications.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Mikhail Lyulyukin, Tikhon Filippov, Svetlana Cherepanova, Maria Solovyeva, Igor Prosvirin, Andrey Bukhtiyarov, Denis Kozlov, Dmitry Selishchev
Summary: This study confirms that solid uranium oxycompounds and uranyl-grafted materials on nanocrystalline anatase TiO2 exhibit higher photocatalytic activity under visible light, with a significantly higher reaction efficiency compared to commercial photocatalysts.
Article
Environmental Sciences
Wanzhen Zhong, Weizhang Fu, Shujuan Sun, Lingsheng Wang, Huaihao Liu, Junzhi Wang
Summary: Excessive N-NO3- water pollution is a widespread and serious problem that poses threats to human and ecosystem health. TiO2/SiO2 composite photocatalyst has shown promising photocatalytic performance in reducing low nitrate concentrations, and optimization of reaction conditions can further enhance the removal rate.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Materials Science, Biomaterials
Debendra Prasad Panda, Akash Kumar Singh, Tapas K. Kundu, A. Sundaresan
Summary: Rare-earth ion-activated oxide phosphors with sharp luminescent transitions show promising potential for bioimaging applications due to their high emission intensity and low cytotoxicity.
JOURNAL OF MATERIALS CHEMISTRY B
(2022)
Article
Chemistry, Multidisciplinary
Bharti Singh, Madhulika Mazumder, Balendra, Athinarayanan Sundaresan, Swapan K. Pati, Arunachalam Ramanan
Summary: Three new isostructural manganese coordination polymers have been successfully crystallized, and their crystal structures and packing modes have been investigated. The magnetic exchange coupling was found to be strongly correlated with the packing of the layers.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Physics, Applied
Soumen Ash, Moumita Naskar, Ravi P. N. Shankar, Nityasagar Jena, A. Sundaresan, Ashok Kumar Ganguli
Summary: We conducted a detailed study on the superconductivity of polycrystalline SnTaS2 using electrical transport, magnetization, and heat capacity measurements. Our results suggest that SnTaS2 is a weakly coupled, type-II superconductor with a critical temperature of approximately 2.8 K. First-principles calculations reveal the presence of nodal line topology in the electronic band structure, which is protected by spatial-inversion and time-reversal symmetries but strongly suppressed by spin-orbit coupling. This makes layered SnTaS2 with nodal line topological state a strong candidate for a 3D topological superconductor.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Debendra Prasad Panda, Diptikanta Swain, Rohit Kumar Rohj, D. D. Sarma, A. Sundaresan
Summary: Organic-inorganic hybrid (OIH) halide perovskite is a promising material in the field of semiconductors, and efforts have been made to design new lead-free OIH halides for optoelectronic applications. We have synthesized a perovskitoid compound and an antiperovskite compound with unique structures and properties. The perovskitoid compound displays switchable dielectric property, while the antiperovskite compound exhibits higher photoluminescence quantum yield and magnetic properties. This structure-property relationship in OIH manganese halides will contribute to the design of new perovskites and antiperovskites.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Debendra Prasad Panda, Diptikanta Swain, Sounak Sarkar, A. Sundaresan
Summary: In this study, two organic-inorganic hybrid halides were synthesized and the role of halogen bonding was revealed. The first compound showed a unique type-II halogen bonding between organic and inorganic ions, leading to structural changes and modulation of photophysical properties. The second compound demonstrated dual-band emission, possibly due to energy transfer from the organic amine to Mn centers. The role of halogen bonding was explored through quantitative electron density analysis and intermolecular interaction energies.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Tanya Berry, Nicodemos Varnava, Dominic H. Ryan, Veronica J. Stewart, Riho Rasta, Ivo Heinmaa, Nitesh Kumar, Walter Schnelle, Rishi Bhandia, Christopher M. Pasco, N. P. Armitage, Raivo Stern, Claudia Felser, David Vanderbilt, Tyrel M. McQueen
Summary: Electrons in solids adopt complex patterns of chemical bonding driven by energy gains and costs. We report a chemical pressure-driven transition in EuMn2P2 from proper Mn magnetic ordering to a Mn magnetic phase crossover, despite remaining an insulator at all temperatures. The absence of a Mn magnetic phase transition contrasts with other isoelectronic materials. Our results demonstrate the sensitivity of the band structure to magnetic order and imply the suppression of long-range Mn magnetic order by chemical pressure.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Rahul Kumar, A. Sundaresan
Summary: Type-II multiferroics often have lower polarization values than Type-I multiferroics, which requires the use of pyrocurrent measurements. However, this method becomes inadequate when faster dipole relaxation and thermally stimulated free charge carriers overshadow the magnitude of the pyrocurrent. This study demonstrates the effectiveness of the DC bias current technique in overcoming this limitation and characterizing type-II multiferroic materials with small polarization.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2023)
Article
Multidisciplinary Sciences
Chunyu Guo, A. Alexandradinata, Carsten Putzke, Amelia Estry, Teng Tu, Nitesh Kumar, Feng-Ren Fan, Shengnan Zhang, Quansheng Wu, Oleg V. Yazyev, Kent R. Shirer, Maja D. Bachmann, Hailin Peng, Eric D. Bauer, Filip Ronning, Yan Sun, Chandra Shekhar, Claudia Felser, Philip J. W. Moll
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Debendra Prasad Panda, Diptikanta Swain, Sundaresan Athinarayanan
Summary: Efforts have been made to design multifunctional lead-free organic-inorganic hybrid (OIH) halide compounds, which are considered as next-generation solar cell materials. However, it is challenging to design OIH halides that exhibit both long-range magnetic ordering and high photoluminescence quantum yield (PLQY) due to the contrasting effect of the compounds' dimensionality. In this study, we demonstrated an approach to enhance PLQY in two-dimensional (2D) Heisenberg antiferromagnets by increasing the alkylene chain length of [H3N-(CH2)(m)-NH3]MnCl4 compounds. These compounds showed long-range antiferromagnetic ordering and an increase in PLQY with increasing spacer cation length. The findings provide insight into the design of new OIH halides with desirable magnetic ordering and PLQY.
Article
Materials Science, Multidisciplinary
Souvik Banerjee, Debendra Prasad Panda, Premakumar Yanda, A. Sundaresan
Summary: We conducted a comprehensive and comparative study on the structural, static, dynamic, and nonequilibrium magnetic properties of the polymorphs of LiFeSnO4. It was found that LiFeSnO4 exhibits two polymorphs, an orthorhombic phase (HT) and a hexagonal phase (LT), which differ in their crystal structures and magnetic properties. Both polymorphs show spin glass behavior and the presence of an exchange bias effect due to magnetic inhomogeneity.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Krishna Manna, Rahul Kumar, Athinarayanan Sundaresan, Srinivasan Natarajan
Summary: New Cu MOFs show polymorphism and have the ability to fix CO2 to cyclic carbonates. They also exhibit Lewis acid catalysis, Lewis base catalysis, and interesting magnetic behavior. The compounds were prepared using different ligands and different reaction conditions, resulting in various structure dimensionalities. The Cu center in the compounds was explored for different catalytic reactions, showing good yields and recyclability. Magnetic studies revealed antiferromagnetic or ferromagnetic interactions in different compounds. This research demonstrates the diversity of copper-containing compounds in extended framework structures.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Debendra Prasad Panda, Diptikanta Swain, Rajamani Raghunathan, A. Sundaresan
Summary: In this study, a newly synthesized lead-free organic-inorganic hybrid compound with one-dimensional chain structure is investigated. The compound exhibits interesting magnetic and photoluminescence properties, including long-range antiferromagnetic ordering and low-dimensional magnetic susceptibility hump. Additionally, the compound displays orange-red emission and shows evidence of electron-phonon coupling.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Multidisciplinary
S. Athira, Saulo L. L. Silva, Probal Nag, Sushma Lakshmi, C. Sharath Kumar, Debendra Prasad Panda, Sayan Das, Sarita Rajput, Andrews P. Alex, A. Sundaresan, Sivaranjana Reddy Vennapusa, T. Maitra, D. Jaiswal-Nagar
Summary: In this paper, the authors used the distance between the states as a theoretical measure to determine the bipartite entanglement in a one-dimensional magnetic dimer system. The calculation was compared with the concurrence, a well-known entanglement measure, and found to be the same. Experimental verification was done on single crystals of copper acetate, showing the existence of bipartite entanglement even at room temperature. Characterization and calculations revealed the weak intermolecular interactions and low probability of direct Cu-Cu exchange in copper acetate.
NEW JOURNAL OF PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Arkadeb Pal, T. W. Yen, T. W. Kuo, C. W. Wang, S. M. Huang, M. C. Chou, Y. C. Lai, Y. C. Chuang, P. Yanda, A. Sundaresan, H. S. Kunwar, V. G. Sathe, Ajay Tiwari, D. Chandrasekhar Kakarla, H. D. Yang
Summary: We report the unconventional and interesting multiferroic behavior of a layered noncentrosymmetric ferrimagnetic spin-1/2 system Bi2Cu5B4O14. Neutron powder-diffraction study reveals a robust ferrimagnetic (up arrow down arrow down arrow down arrow down arrow) ordering below TC = 25 K, which remains unaffected even under a high magnetic field of H = 10 T. Interestingly, two successive ferroelectric transitions are observed, one triggered by the magnetostriction effect at TC = TE2 = 25 K and another caused by a structural distortion at TE1 = 32 K.
Article
Materials Science, Multidisciplinary
Rahul Kumar, A. Sundaresan
Summary: In this paper, the field-induced ferroelectricity in BaHoFeO4 within a narrow range of applied magnetic fields (1.5 T H 5 T) is reported. Magnetization measurements reveal magnetic anomalies at TFe ordering of Fe3+, a possible spin structure change of Fe3+, and the antiferromagnetic ordering of Ho3+ sublattices. Heat capacity data did not show any anomaly at TNFe, but exhibited a broad N . Isothermal magnetization measurements indicate a metamagnetic transition at 1.5 T below 40 K. Temperature-dependent dielectric measurements below 1 T reveal two anomalies corresponding to Ho3+ ordering and a possible change in the magnetic phase of the Fe sublattice. These anomalies disappear at higher magnetic fields, and a different dielectric anomaly appears above the metamagnetic transition. A switchable electric polarization appears below 25 K and above the metamagnetic transition field (H 1.5 T), but disappears above 5 T.