Article
Materials Science, Ceramics
Yao Zhou, Chao Liu, Ying Ye, Yudong Zhang, Wenchao Zhang, Yuzhou Hu
Summary: This study reports a method for spatially controlled precipitation of CsPbX3 perovskite nanocrystals (PNCs) in the surface layer of glasses through ion-exchange. By utilizing ion-exchange, PNCs with tunable compositions can be precipitated in the glass surface layer, resulting in efficient photoluminescence ranging from blue to red.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Eung-Dab Kim, Young-Sik Cho, Young-Duk Huh
Summary: In this study, Cu2O microcrystals with various shapes were successfully prepared by adjusting the reaction conditions. The morphology of Cu2O crystals changed with increasing reaction temperature, NaOH concentration, and glucose amount.
Article
Chemistry, Multidisciplinary
Changjiu Sun, Yuanzhi Jiang, Li Zhang, Keyu Wei, Mingjian Yuan
Summary: Lead halide perovskite nanocrystals (LHP NCs) have great potential in optical sources, photovoltaics, and sensor fields. This Perspective summarizes representative attempts to achieve controlled synthesis of LHP NCs. By changing the synthesis method, LHP NCs with kinetic dominance and size tunability can be obtained. Undesired ripening effects can be eliminated, and homogeneous size distribution can be achieved through rational ligand selection and solvent engineering.
Article
Chemistry, Multidisciplinary
Ryosuke Fujiwara, Yohei Takashima, Takaaki Tsuruoka, Muneyuki Naito, Junya Murai, Kensuke Akamatsu
Summary: The synthesis of high-purity nanocrystals as precursors for nanostructured thermoelectronics is crucial for achieving high thermoelectric performance. In this study, single-phase Bi2-xSbxTe3.0 (x = 1.5, 1.6, and 1.7) nanocrystals without impurities were successfully synthesized through a chemical precipitation process at room temperature. The rapid reaction rate of this process is attributed to the charge compensation of reactive metal ions, suppressing crystal growth. By refluxing with organic solvents of different boiling points, the size of Bi0.4Sb1.6Te3.0 nanocrystals can be controlled from single-nanometer to submicron scales.
RESULTS IN CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Xue Bai, Finn Purcell-Milton, Yurii K. Gun'ko
Summary: Cu-Based quantum dots are being explored as a potential replacement for toxic Cd- or Pb-based QDs, with studies focusing on the impact of different reaction conditions on the resulting morphologies and optical properties. By carefully controlling the ZnS shell deposition, researchers have optimized the synthesis of CIZS/ZnS/ZnS QDs and produced highly fluorescent core/shell/shell heterostructured QDs with high PLQYs. Additionally, the successful creation of giant ZnS shell QDs opens up possibilities for further development in this area.
Article
Chemistry, Inorganic & Nuclear
Yutong Zhao, Mengxue Liu, Wenqian Zhang, Xue Sun, Wenliang Wang, Wenxiu Zhang, Mengqi Tang, Wenqing Ren, Mingyu Sun, Wenling Feng, Weihua Wang
Summary: Cu3MX4 compounds have emerged as promising solar energy conversion materials due to their adjustable band gaps, high optical absorption coefficients, environmentally benign nature, and abundant elements. This study reports the successful synthesis of highly crystalline and uniform cube-shaped Cu3NbSe4 nanocrystals, and reveals the significant roles of reaction temperature, time, and surface ligand in determining their crystalline phase, size, and morphology. A Cu3NbSe4-based photodetector exhibits excellent performance with a high I-light/I-dark ratio, fast response speeds, and stability, indicating its potential applications in electronics and optoelectronics.
DALTON TRANSACTIONS
(2022)
Article
Engineering, Environmental
Wenchao Zhang, Ying Ye, Yuzhou Hu, Kai Li, Chao Liu
Summary: Cesium lead halide perovskite nanocrystals have unique optoelectronic properties and are widely used in various fields. Embedding them into glass matrices enhances their thermal and chemical stabilities. However, these nanocrystals are still sensitive to intense light irradiation, which limits their applications.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Ceramics
Fei Li, Wei Cui, Zhaobo Tian, Jie Zhang, Songmo Du, Zhanglin Chen, Kexin Chen, Guanghua Liu
Summary: β-SiC powders with different particle morphologies were prepared by combustion synthesis using carbon black, carbon fiber, graphene, and graphite as carbon sources. The morphology of the precursor carbon source plays a crucial role in determining the particle morphology of SiC during the controlled growth process.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Inorganic & Nuclear
Yongqiang Ji, Minqiang Wang, Zhi Yang, Hengwei Qiu, Hui Wang, Muhammad Amin Padhiar, Yun Zhou, Jialin Dang, Nikolai Gaponenko, Arshad Saleem Bhatti
Summary: The recent interest in ultrathin perovskite nanostructures is driven by their unique properties such as strong quantum confinement effects and large specific surface area. The synthesis of high-quality ultrathin CsPbBr3 perovskite nanosheets via a simple mixing of precursor-ligand complexes under ambient conditions has opened up new possibilities for the fabrication of other ultrathin nanostructures. This method allows for the enhanced optical properties of the nanostructures due to the disappearance of grain boundaries and protection of branched ligands.
DALTON TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
Shaoshan Su, Wei Song, Hongli Wen, Zhurong Mo, Tonghua Wan, Lin Yu, Weiren Zhao, Deshmukh Abdul Hakeem
Summary: Researchers achieved the controlled synthesis of KYb2F7:Er3+ nanocrystals using a hydrothermal method, and improved their thermometric properties by substituting Yb3+ ions with other cations. This substitution strategy could be a powerful tool for enhancing the thermometric properties of luminescent materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Green & Sustainable Science & Technology
Uros Hribar, Matjaz Spreitzer, Jakob Koenig
Summary: This study aims to transfer the foaming process of carbon-containing mixtures from an inert to an air atmosphere by adding water glass, which effectively protects the carbon from premature oxidation. The obtained foamed glass samples show relatively low density and open porosity, resulting in low thermal conductivity.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Multidisciplinary
Chenxiao Wang, Zhennan Huang, Yong Ding, Minghao Xie, Miaofang Chi, Younan Xia
Summary: This study presents a method for the facet-controlled synthesis of nanocrystals with an ultrathin shell made of a nearly equimolar RuRhPdPt quaternary alloy, showing greatly enhanced activity toward ethanol oxidation. The core-shell nanocubes demonstrate good thermal and electrochemical stability in terms of both geometrical shape and elemental composition, making them a promising candidate for various thermal and electrochemical reactions. The synthetic approach can potentially be extended to fabricate multimetallic catalysts with enhanced activities.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Ceramics
Francois O. Mear, Renaud Podor, Joseph Lautru, Sebastien Genty, Ronan Lebullenger
Summary: The presence of water steam facilitates glass grain sintering and decreases glass viscosity, favoring the formation of closed pores. At high temperatures, water steam or oxygen promotes foaming, while a reducing atmosphere limits glass melt foaming. A synergistic effect of oxygen and water steam on the onset temperature of glass sintering and foam formation is demonstrated.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Ming Zhao, Zitao Chen, Yifeng Shi, Zachary D. Hood, Zhiheng Lyu, Minghao Xie, Miaofang Chi, Younan Xia
Summary: The synthesis of Rh nanocrystals with different shapes was achieved by controlling the kinetics involved in the growth process, and the resulting nanocrystals showed various facet-dependent properties in thermal and catalytic applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Multidisciplinary Sciences
Taewan Kim, Seongmin Park, Sohee Jeong
Summary: A growth model based on monomer diffusion dynamics was proposed to synthesize colloidal InAs QDs with a size over 9.0 nm and a narrow size distribution. By controlling the diffusion dynamics, the authors were able to overcome the size limitation of nanocrystal growth in solution and extend the spectral coverage of InAs QDs beyond 1S(max) of 1600 nm.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Applied
Y. Shao, R. L. Conner, N. R. S. Souza, R. S. Silva, L. G. Jacobsohn
Summary: This paper briefly reviews the fabrication of ceramic scintillators by laser sintering and discusses the current limitations. The experimental work focuses on the fabrication and characterization of undoped and Pr-doped LuAG. XRD and Raman spectroscopy are used to characterize the structure of the sintered ceramics, with XRD results suggesting the absence of residual thermal stresses. Raman results suggest that the incorporation of Pr affects the structure and dynamics of the material.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
R. F. Abreu, F. A. C. Nobrega, D. da M. Colares, S. O. Saturno, J. P. C. do Nascimento, T. O. Abreu, A. Ghosh, F. F. do Carmo, M. A. S. Silva, A. J. M. Sales, R. S. Silva, A. S. B. Sombra
Summary: This paper reviews the dielectric properties of Sr2TiSi2O8 (STS) ceramic in the RF and MW regions. X-ray diffraction analysis reveals the presence of a small secondary phase of SrTiO3 in the synthesized STS ceramic. Complex impedance spectroscopy is used to observe typical permittivity values of ceramic materials. AC conductivity changes with frequency are found to be thermally activated, with an activation energy of 1.0 eV. In the MW range, the STS ceramic exhibits interesting properties for applications in MW devices, with values of epsilon(r) = 12.7, tan delta = 1.3 x 10(-2), and tau(f) = - 6.1 ppm/degrees C.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Chemical
Leandro R. Prado, Renan T. Figueiredo, Ronaldo S. Silva, Cristiano T. Meneses, Flavia M. R. Mendonca, Gustavo R. Borges, Claudio Dariva, Elton Franceschi, Giancarlo R. Salazar-Banda, Silvia M. Egues
Summary: Mesoporous titanium dioxide particles (TiO2) were synthesized through reactive precipitation using the supercritical anti-solvent (SAS) technique with carbon dioxide and the ionic liquid (IL) 1-methyl-3-octylimidazolium bis[trifluoromethylsulfonyl] imide, [C(8)mim][NTf2]. The particles exhibited anatase and brookite crystalline phases, with brookite peaks more pronounced in samples synthesized with the IL. The TiO2 particles had high surface area, controlled porosity, narrow pore size distribution, high thermal stability, and spherical morphology. The particle size decreased with the use of the IL and increased with a higher precursor/alcohol ratio.
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Francisco Enilton Alves Nogueira, Tallison Oliveira Abreu, Vitor Carvalho Martins, Roterdan Fernandes Abreu, Felipe Felix do Carmo, Joao Paulo Costa do Nascimento, Anupama Ghosh, Antonio Jefferson Mangueira Sales, Marcelo Antonio Santos da Silva, Ronaldo Santos da Silva, Antonio Sergio Bezerra Sombra
Summary: This work investigates the microwave dielectric properties of CaMoO4 (CMO) ceramic matrix with the addition of TiO2. The results show that the addition of TiO2 improves the dielectric properties of CMO and demonstrates thermal stability. The ceramic was tested as a dielectric resonator antenna (DRA) and showed promising performance in the S-band.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Review
Optics
E. V. Guimaraes, A. S. Silva, G. A. Azevedo, N. O. Dantas, R. S. Silva
Summary: The internal energy transfer phenomenon in Bi2S3 nanocrystals with Co-doping has been experimentally observed. The changes in optical absorption and photoluminescence spectra are related to the symmetrical environment of the Co ions.
JOURNAL OF LUMINESCENCE
(2023)
Article
Optics
Nilo F. Cano, Sandra C. Aynaya-Cahui, Zaida V. Vilca, Rene R. Rocca, T. K. Gundu Rao, Betzabel N. Silva Carrera, Alejandro H. Lopez-Gonzales, Henry S. Javier-Ccallata, Jorge S. Ayala-Arenas
Summary: This study systematically investigated the structural and dosimetric properties of the lithium silicate phosphor under ionizing radiation. The phosphor exhibited good dose response performance, making it suitable for radiation dose measurement.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Robson H. Rosa, Ricardo S. Silva, Lucas L. Nascimento, Monica H. Okura, Antonio Otavio T. Patrocinio, Joao A. Rossignolo
Summary: TiO2 films were deposited on fiber-cement surfaces using the doctor blade technique. The films exhibited homogeneous and nanoparticulated morphology. The TiO2-PC105 film had lower roughness compared to the TiO2 P25-based film. Both films showed high hydrophilicity under UV-A radiation. The TiO2-PC105 film had a photonic efficiency of xi = 0.1%, while for the TiO2-P25 films, xi = 0.08%. The PC105 film modified cement surface exhibited high antimicrobial activity. The results demonstrate the self-cleaning ability of the films and their potential for protecting fiber-cement surfaces.
Article
Materials Science, Ceramics
L. M. Jesus, L. B. Barbosa, D. R. Ardila, R. S. Silva, J. -C. M'Peko
Summary: We demonstrated that the dielectric permittivity e' of CaCu3Ti4O12 (CCTO) ceramics can reach giant (>104) or moderate (-102) values at room temperature depending on the resistivity of the grains. A highly resistive bulk with no giant e' was obtained by sintering at 980°C. Sintering at 1050°C resulted in the development of a semiconducting phase within the grains and a thin resistive phase, forming a core-shell bulk structure. Increasing the sintering temperature to 1100°C led to the growth of the semiconducting phase at the expense of the insulating shell, forming the well-known Internal Barrier Layer Capacitance (IBLC) structure. This phenomenon is thermally originated and related to Cu migration towards grain boundaries.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Condensed Matter
Eder Guimara, Carlos A. A. Vasconcelos, Ricardo S. Silva, Nilo F. Cano, Noelio O. Dantas
Summary: In this study, quantum dots of manganese-doped tin telluride (SnTe) were successfully synthesized in a glass matrix using fusion and heat treatment methods. Transmission electron microscopy images showed the formation of quantum dots with an average diameter of 5 nm in the glass matrix. Electron paramagnetic resonance and Raman spectra provided strong evidence of manganese ion incorporation in the Sn1-xMnxTe quantum dots.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Physics, Condensed Matter
I. A. T. Gaia, E. V. Guimaraes, P. I. S. Maia, H. D. Mikhail, M. S. da Luz, R. S. Silva
Summary: The synthesis of Bi2O3/Bi2S3 nanoparticles with 1-thioglycerol as a stabilizing agent by the aqueous colloidal method was demonstrated in this study. The morphological, structural, and optical properties of the nanoparticles were investigated using various analytical techniques. The results suggest that Bi2O3/Bi2S3 nanoparticles have great potential for biotechnological applications.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Engineering, Chemical
Aline R. Doria, Angela Moratalla, Caio V. S. Almeida, Ronaldo S. Silva, Katlin I. B. Eguiluz, Giancarlo R. Salazar-Banda, Manuel A. Rodrigo, Cristina Saez
Summary: Developing highly selective anode materials for hypochlorite generation in low-concentrated sodium chloride solutions is challenging. In this study, ruthenium-based binary anodes (Ti/RuO2 -Sb2O4 and Ti/RuO2 -TiO2) were synthesized using different heating methods. The anode characteristics and catalytic activity were found to be influenced by the heating method and chemical composition. The Ti/RuO2 -TiO2 anode prepared by laser heating showed the highest electrocatalytic activity for generating hypochlorite from low-concentrated NaCl solutions. This study provides new insights into the preparation of low-cost materials for efficient disinfectant generation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Aline R. Doria, Isabelle M. D. Gonzaga, Gessica O. S. Santos, Caio V. S. Almeida, Deyvid C. Silva, Ronaldo S. Silva, Luciane P. C. Roma, Cristina Saez, Giancarlo R. Salazar-Banda, Katlin I. B. Eguiluz
Summary: Ti/RuO2-TiO2 anodes were prepared using unconventional heating methods involving CO2 laser and microwave irradiation. These anodes exhibited improved electrochemical properties compared to conventionally-prepared anodes, with increased voltammetric charge and decreased charge transfer resistance. The laser and microwave-prepared anodes also had longer lifetimes and high efficiency in generating hypochlorite and degrading ciprofloxacin.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Zaida V. Vilca, T. K. Gundu Rao, Rene R. Rocca, J. F. Benavente, Joseff R. Mejia-Bernal, Jose F. D. Chubaci, Betzabel N. Silva-Carrera, Jorge S. Ayala-Arenas, Nilo F. Cano
Summary: This study investigated the thermoluminescence (TL) and defect centers of calcium silicate phosphor prepared by the sol-gel method. The results showed that the phosphor has four TL peaks and a single emission band at 370nm. Three defect centers related to the TL process were observed.
APPLIED RADIATION AND ISOTOPES
(2023)
Article
Chemistry, Multidisciplinary
T. H. de Vasconcelos, H. de O. Barros, R. V. B. Campos, F. F. do Carmo, J. P. C. do Nascimento, D. X. Gouveia, M. A. S. Silva, A. J. M. Sales, R. S. Silva, A. S. B. Sombra
Summary: This study evaluated the dielectric properties of a ZnNb2O6 matrix with added TiO2 in the microwave region. The addition of TiO2 led to the formation of the ZnTiNb2O8 phase. The ZNO-ZTNO composites showed improved resonant frequency coefficient, and as dielectric resonator antennas, exhibited high gain, bandwidth, and efficiency.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2024)
Article
Optics
Betzabeth J. Lopez-Flores, T. K. Gundu Rao, Klinton Turpo-Huahuasoncco, Jessica Mosqueira-Yauri, Jorge S. Ayala-Arenas, J. F. Benavente, Rene R. Rocca, Nilo F. Cano
Summary: The thermoluminescent properties and defect centers induced by gamma irradiation in Tb-doped strontium silicate phosphor were studied. The number of TL glow peaks and the kinetic parameters were analyzed using Tm-Tstop and deconvolution methods. The electron paramagnetic resonance technique was used to identify the defect centers responsible for the observed TL glow peaks.
JOURNAL OF LUMINESCENCE
(2023)
