Article
Materials Science, Multidisciplinary
L. Farahinia, M. Rezvani, M. Rezazadeh
Summary: The study focused on investigating the optical properties and structural changes of oxyfluoride glasses with different amounts of CaF2 (CaO). By altering the ratios, the crystallization temperature, density, and nanocrystal size were affected, ultimately leading to changes in Fermi energy levels and optical band gaps.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Polymer Science
Vinayak S. Bhat, S. B. Kapatkar, N. H. Ayachit, Ishwar Naik, M. S. Murari
Summary: Composite films of PFO/PMMA with various PFO concentrations were prepared and studied for their optical properties. The segregation of PFO increased with doping concentration, while the absorption spectrum intensity, band gap values, Urbach energy values, and refractive index all showed changes with doping concentration, stabilizing around 1 wt% of PFO. This study demonstrates the impact of doping concentration on the optical properties of PFO/PMMA composite.
Article
Chemistry, Physical
Alberto Mannu, Francesca Cardano, Andrea Fin, Salvatore Baldino, Cristina Prandi
Summary: This study analyzed the structural features of five ternary eutectic systems containing choline chloride through UV-VIS spectroscopy, investigating the relationship between composition and energy. The results showed that composition and operational parameters influence structural disorder, and the DES-aging has a significant impact on the system structure.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Energy & Fuels
Rico Gutzler, Wolfram Witte, Ana Kanevce, Dimitrios Hariskos, Stefan Paetel
Summary: Large sets of experimental data are crucial for evaluating statistical device performance and identifying underlying trends. This study presents a standardized and optimized inline fabrication process and applies statistical analysis to tens of thousands of chalcopyrite-type Cu(In,Ga)Se-2 cells. The abundance of samples allows for highlighting the benefits of Ag alloying in the absorber and its relationship with compositional and optoelectronic properties. The impact of chemical composition on solar cell parameters emphasizes the importance of fill factor on overall cell performance. Additionally, the study demonstrates that increasing the amount of Cu and/or Ag can reduce losses in open-circuit voltage due to radiative losses.
PROGRESS IN PHOTOVOLTAICS
(2023)
Article
Optics
S. Cetinkaya Colak
Summary: Sodium calcium silicate glasses incorporated with V2O5 were prepared using the melt-quench technique. The addition of ZnO improved light transmittance, while V2O5 reduced the optical band gap. The structural, thermal, and optical properties of the glasses were investigated.
Article
Materials Science, Multidisciplinary
H. Aghababaei, A. Faeghinia, F. Soleimani
Summary: The P2O5-TiO2-CaO system was studied as a suitable host for rare-earth ions. Glasses doped with neodymium showed an increase in absorbance and a decrease in emission intensity, indicating a change in optical properties. The addition of Nd also led to a decrease in direct optical band gap energy and an increase in Urbach energy.
Article
Materials Science, Ceramics
Iliyasu Usman, Mohamad Syazwan Mohd Sanusi, Nor Ezzaty Ahmad, Mohd Shafiq bin Shaharin
Summary: The influence of & alpha;-Fe2O3 nanoparticles on the structural, physical, and optical properties of synthesized glass was investigated. The addition of & alpha;-Fe2O3 led to changes in density, molar volume, B-O-B bond intensity, optical band gap, transmission coefficient, reflectance loss, Urbach energy, interatomic separation, metallization, refractive index, molar refractivity, electronic polarizability, and dielectric constant. The glass with & alpha;-Fe2O3 showed semiconductor properties and is suitable for photonic applications.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
H. Es-soufi, L. Bih
Summary: Phosphate glasses in the 20Li(2)O-(40-x)Li2MoO4-xTiO(2)-40P(2)O(5) system were prepared and characterized to investigate their structural and optical properties. The study found that properties such as density, molar volume, glass transition temperature, and optical band gap energy were influenced by the chemical composition of the glasses.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Optics
Fahimeh Ahmadi, Rosli Hussin, Sib Krishna Ghoshal
Summary: The prepared magnesium-zinc-sulfophosphate glasses were characterized with XRD patterns and various optical properties were calculated for each sample. The density of the glasses increased with Dy3+ concentration, while the molar volume initially decreased and then increased with 1.5 mol% Dy2O3. The optical energy band gap linearly increased with Dy2O3 concentration up to 1.5 mol%, possibly due to the formation of NBOs, and other optical properties showed similar trends with Dy3+ content.
Article
Materials Science, Multidisciplinary
Leelavati, Rajesh Kumar, Ravi Kumar
Summary: The study investigated the impact of different doping concentrations of Mn2+ ions on the properties of CdO, revealing changes in lattice structure, electron concentration, band gap, and Urbach energy with increasing doping concentration.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
M-B Bouzouraa, A. En Naciri, Y. Battie, S. Dalmasso, S. Diliberto, A. Bouche, N. Chaoui
Summary: This study investigated the effects of nitrogen N+2 ion beam on TiO2 thin films using various techniques such as Raman spectroscopy, grazing incidence X-ray diffractometer (GIXRD), X-ray photoelectron spectroscopy (XPS), spectroscopic ellipsometry (SE), atomic force microscopy (AFM), and photoluminescence spectroscopy (PL). The results showed significant changes in the physical properties of TiO2 after exposure to the N+2 ion beam.
Article
Engineering, Electrical & Electronic
R. Ben Said, N. Moutia, B. Louati, K. Guidara, K. Khirouni
Summary: New Zn2P2O7, K2ZnP2O7, and KZn1.5P2O7 compounds were synthesized using the conventional solid-solid reaction method. Their optical properties were investigated using UV-Visible spectrophotometer, revealing the optical band gaps and other optical parameters.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Nader Ghobadi, Ebrahim Gholami Hatam
Summary: The optical behavior, stoichiometry, and surface configuration of Cu2Se nanostructured thin layers prepared using a chemical process at different reaction times were investigated. The results showed that the optical band gap decreased with increasing reaction time, and the Urbach energy was independent of film thickness. The concentration of Cu: Se in the deposited film remained constant across the depth at longer deposition times. A degradation efficiency of 98% was achieved by Congo red for the prepared Cu2Se thin film under optimal conditions, making it a promising material for organic dye. By controlling the band gap energy, Cu2Se could be applied in solar cell applications.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Materials Science, Ceramics
Zongliang Xiao, Fengqin Lai, Shikun Qin, Jiajun Gou, Ke Zeng, Jianlei Liu, Taoyong Liu, Weixiong You, Lei Han, Qian Zhang
Summary: Rare earth-doped glass, especially Tm3+/Dy3+ co-doped phosphate glasses, have great potential applications in solid-state lighting. The increase in Tm3+ contents enhances the density of the co-doped glasses, and the transmission spectra show Urbach energies ranging from 0.242 to 0.374 eV. Excited at 362 nm, the glasses produce white light with chromaticity coordinates close to standard white light. The energy transfer from Tm3+ to Dy3+ is mainly governed by electric dipole-dipole interaction, resulting in a high energy transfer efficiency of 64.44% according to fluorescence spectra. Moreover, the co-doped glasses exhibit a significant moisture resistance of 99.2% and retain approximately 85.4% of their initial luminescent intensity at 150 degrees C. These findings highlight the potential applications of Tm3+/Dy3+ co-doped glasses in W-LED and display devices.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Physics, Multidisciplinary
Ahmed Kadari, Khaled Aissaoui, Intesar A. El-Mesady
Summary: Zn2SnO4 nanostructures doped with different rare earth elements (Dy3+, Sm3+, Yb2+, Eu3+ and Gd2+) were synthesized using sol-gel method. The crystallographic nature of the prepared materials was confirmed by X-Rays Diffraction (XRD). The particle sizes were calculated to be approximately 24 nm. The chemical bond types were identified through Fourier Transform Infrared spectroscopy (FTIR). The dopants affected the absorbance spectra, with a decrease in energy band gap (E (opt)) from 3.89 eV to 2.80 eV for direct transitions and a range of 3.93 to 2.25 eV for indirect transitions. The Urbach energies (E-U) were found to be within the range 0.70-0.42 eV. These results suggest that the suggested dopants can be utilized in the correct form in industrial applications.
Review
Biochemistry & Molecular Biology
Majid M. Heravi, Pourya Mohammadi
Summary: Layered double hydroxides (LDHs) are utilized as efficient and eco-friendly catalysts in Suzuki, Heck, Sonogashira, and Ullmann cross-coupling reactions, leading to carbon-carbon bond formations.
MOLECULAR DIVERSITY
(2022)
Article
Engineering, Chemical
Ghazaleh Jahani, Masoume Malmir, Majid M. Heravi
Summary: A novel nitrogen- and sulfur-doped graphene carbon dot-modified magnetic nanocomposite was synthesized and characterized. The catalyst, Fe3O4/g-CSNCDs, showed excellent catalytic activity and selectivity in alcohol oxidation. The carbonation of reagents and magnetic nanoparticles were found to have an impact on the catalytic performance. The Fe3O4/g-CSNCDs catalyst not only exhibited recyclability and magnetic recovery, but also showed improved catalytic activity compared to the bare g-CSNCDs.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Review
Chemistry, Multidisciplinary
Majid M. Heravi, Vahideh Zadsirjan
Summary: This review summarizes recent advances in the synthesis and aromatization of Hantzsch 1,4-dihydropyridines under microwave irradiation, highlighting the use of this green approach.
Review
Chemistry, Applied
Yalda Rangraz, Majid M. Heravi
Summary: The development of methodologies for carbon-nitrogen bond formation is crucial in organic synthesis, as the resulting products are widely used in pharmaceuticals, biologically active compounds, and natural products. Recently, nanosized metal catalysts have gained significant attention for their excellent catalytic performance, high product yields, mild reaction conditions, and environmental sustainability. This review provides an overview of the latest progress in the fabrication of nanocatalysts and their applications in constructing carbon-nitrogen bonds via cross-coupling reactions.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Leyla Mohammadkhani, Majid M. Heravi, Farhad Panahi
Summary: This paper reports the efficient conversion of nitroarenes to anilines using immobilized palladium nanoparticles on a silica-starch substrate. The catalyst system exhibited high efficiency and could be reused multiple times.
MONATSHEFTE FUR CHEMIE
(2022)
Article
Chemistry, Multidisciplinary
Reihaneh Malakooti, Majid M. Heravi, Zahra Amiri, Kosar Kafshdarzadeh, Vahideh Zadsirjan, Zeynab Parsaee
Summary: In this study, [Cu(bpdo)(2)center dot 2H(2)O](2+)/montmorillonite nanocomposite was successfully prepared and characterized. It exhibited efficient catalytic activity in the synthesis of 2-amino-4H-chromene and 2-amino-4H-benzopyran derivatives, as well as spirochromene and spiroacenaphthylene derivatives via multicomponent reactions. The method demonstrated advantages such as efficiency, rapidness, easy operation, high yields, recyclable catalyst, and environmentally friendly conditions.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Multidisciplinary Sciences
Mansoureh Daraie, Masoud Mirzaei, Maryam Bazargan, Vadjiheh Sadat Amiri, Bita Abdolahi Sanati, Majid M. Heravi
Summary: A series of nanocatalysts containing different lanthanide elements were synthesized and evaluated for their catalytic performance in the synthesis of bioactive isatin derivatives, with nano-Gd-B2W22 showing superior catalytic activity.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
Masoume Malmir, Majid M. Heravi, Zahra Yekke-Ghasemi, Masoud Mirzaei
Summary: Polyoxometalates (POMs) are efficient catalysts that can be used for a wide range of chemical transformations. In this study, two hybrid and heterogeneous Keggin catalysts, TBA-PW11 and TBA-SiW11, were reported. The catalytic performance of these catalysts was tested in the cyanosilylation reaction under solvent-free conditions. TBA-PW11 showed better catalytic efficiency than TBA-SiW11, possibly due to its higher Lewis acidity and easier accessibility of metal centers. The recyclability and heterogeneity of both catalysts were also examined, and they remained active after at least three recycling procedures.
SCIENTIFIC REPORTS
(2022)
Review
Chemistry, Organic
Majid M. Heravi, Batoul Alipour, Vahideh Zadsirjan, Masoume Malmir
Summary: The Robinson annulation is a significant reaction for the synthesis of alpha,beta-unsaturated ketone ring that involves the generation of two C-C bonds. It has been frequently used in the total synthesis of biologically active natural products. These products and their derivatives play a major role in pharmacotherapy, especially for cancer and infectious diseases.
ASIAN JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Masoume Malmir, Majid M. Heravi, Zahra Yekke-Ghasemi, Satar Saberi, Masoud Mirzaei
Summary: A new heterogeneous catalyst, TBA8[Zr(W5O18)2]middot17H2O (Zr(W5)2), was synthesized and characterized. It was found that the catalyst had a sandwich-type structure consisting of zirconium ions and mono-lacunary Lindqvist [W5O18 ]4- anions, encapsulated by TBA+ cations. This catalyst exhibited hydrophobic properties and improved catalytic efficiency by trapping reactants on its surface. Using Zr(W5)2 as a catalyst, a series of 1,5-benzodiazepines were successfully synthesized via mild and solvent-free reactions.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Applied
Masoume Malmir, Majid M. Heravi, Ghazaleh Jahani
Summary: Metal-organic frameworks (MOFs) are viable and environmentally friendly alternatives to traditional catalysts, and the magnetic Ox-CN-Cu-MOF catalyst has shown remarkable catalytic performance due to its unique structure and Lewis acidic properties. It also exhibits excellent recyclability.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Biotechnology & Applied Microbiology
Masoumeh Bagheri Bisafar, Masoume Malmir, Majid M. Heravi
Summary: In this study, a novel magnetic MOFs-based catalyst was synthesized and showed good catalytic activity and stability for the reduction of nitroarenes and organic dyes. The catalyst can be easily separated and recovered by magnetic separation, and it can be reused for multiple cycles.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Zahra Yekke-Ghasemi, Majid M. Heravi, Masoume Malmir, Masoud Mirzaei
Summary: In this study, a tri-component composite Zr/SiW12/GO was prepared using an ultrasonic-assisted method. This composite, acting as a remarkable heterogeneous catalyst, showed exceptional catalytic performance in the oxidation reaction of sulfides to sulfoxides. The composite also demonstrated exceptional stability and could be reused up to four times without significant loss in its catalytic activity.
SCIENTIFIC REPORTS
(2023)
Review
Chemistry, Multidisciplinary
Majid M. Heravi, Azadeh Nazari
Summary: Natural product synthesis is a constantly evolving field that evaluates new synthetic methods and reagents to address the complexities of structures and functions. SmI2, a widely-used reagent in chemical synthesis, has been highlighted in this review for its recent advances and strategies used in the total synthesis of natural products since 2004.
Review
Chemistry, Multidisciplinary
Majid M. Heravi, Vahideh Zadsirjan
Summary: The Hantzsch reaction is a well-known multi-component reaction for synthesizing 1,4-dihydropyridines, and microwave irradiation has been successfully utilized as a green energy source to promote this organic transformation. Literature survey shows that construction and aromatization of 1,4-DHPs can be effectively carried out under microwave irradiation in solution or dry media.
