Supramolecular nanostructured materials, displaying Förster resonance energy transfers (FRET) signals, have become the focus of interest for many researchers across the globe. FRET based supramolecular systems have extended applications in areas as diverse as materials science, biochemistry, analytical chemistry, and nanomedicine. The non-covalent phenomena operating in supramolecular frameworks depends on many factors such as wide range of time scales, binding strengths, distances, and concentrations of the supramolecular components (host and guest). Here in, we focus in which FRET has been used to study non-covalent interactions having a key role of cancer diagnosis and temperature sensing in supramolecular systems. Furthermore, we have discussed FRET-based architectures with current advancement in the field and provide a perspective on new advancement for the future.
{"title":"Mini review Applications of FRET-based supramolecular architectures for temperature sensing and Cancer diagnosis: A mini-review","authors":"Amir Sohail","doi":"10.23647/ca.md20220102","DOIUrl":"https://doi.org/10.23647/ca.md20220102","url":null,"abstract":"Supramolecular nanostructured materials, displaying Förster resonance energy transfers (FRET) signals, have become the focus of interest for many researchers across the globe. FRET based supramolecular systems have extended applications in areas as diverse as materials science, biochemistry, analytical chemistry, and nanomedicine. The non-covalent phenomena operating in supramolecular frameworks depends on many factors such as wide range of time scales, binding strengths, distances, and concentrations of the supramolecular components (host and guest). Here in, we focus in which FRET has been used to study non-covalent interactions having a key role of cancer diagnosis and temperature sensing in supramolecular systems. Furthermore, we have discussed FRET-based architectures with current advancement in the field and provide a perspective on new advancement for the future.","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89407910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Volatile organic compounds constitute a group of dangerous air pollutants, which can be eliminated by the photocatalytic route. In this work we demonstrated the hydrothermal synthesis of photocatalytic composite CTO-RGO based on copper titanate and reduced graphene oxide. The material is composed of three phases namely rutile, tenorite and reduced graphene oxide, and it shows absorption in a broad range of light (ultraviolet and visible light). CTO-RGO showed an excellent photocatalytic activity in a laboratory scale experiment. Therefore it has been used as an active material in air purifying devices. A prototype was tested in operational environments such as apartment, fitness center and industrial places. Obtained results confirmed the significant decrease of VOC level due to photocatalytic degradation of pollutants.
{"title":"Graphene-titanate photocatalyst and its use in an air purifying device - prototype demonstration in operational environment","authors":"T. Baran, S. Wojtyła","doi":"10.23647/ca.md20211203","DOIUrl":"https://doi.org/10.23647/ca.md20211203","url":null,"abstract":"Volatile organic compounds constitute a group of dangerous air pollutants, which can be eliminated by the photocatalytic route. In this work we demonstrated the hydrothermal synthesis of photocatalytic composite CTO-RGO based on copper titanate and reduced graphene oxide. The material is composed of three phases namely rutile, tenorite and reduced graphene oxide, and it shows absorption in a broad range of light (ultraviolet and visible light). CTO-RGO showed an excellent photocatalytic activity in a laboratory scale experiment. Therefore it has been used as an active material in air purifying devices. A prototype was tested in operational environments such as apartment, fitness center and industrial places. Obtained results confirmed the significant decrease of VOC level due to photocatalytic degradation of pollutants.","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79270705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The methods of preparation, as well as the structure and most relevant physical properties of amorphous materials based on ferroelectrics with perovskite structure are reviewed. The theoretical basis for the possibility of ferroelectricity in non-crystalline solids is discussed. The structural relaxation in a glassy state and the crystallization processes leading to the formation of a ferroelectric phase are considered. The structure and physical properties of thin-film amorphous ferroelectrics that demonstrate noticeable differences from the properties of the same materials in bulk state are discussed separately
{"title":"Amorphous materials based on perovskite ferroelectrics","authors":"S. Gridnev, L. Korotkov","doi":"10.23647/ca.md20202808","DOIUrl":"https://doi.org/10.23647/ca.md20202808","url":null,"abstract":"The methods of preparation, as well as the structure and most relevant physical properties of amorphous materials based on ferroelectrics with perovskite structure are reviewed. The theoretical basis for the possibility of ferroelectricity in non-crystalline solids is discussed. The structural relaxation in a glassy state and the crystallization processes leading to the formation of a ferroelectric phase are considered. The structure and physical properties of thin-film amorphous ferroelectrics that demonstrate noticeable differences from the properties of the same materials in bulk state are discussed separately","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91543426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The perovskite structure with general formula ABX3 shows its multidimensional nature in regards to correlations of crystal structures with electronic, magnetic, optical, and catalytic properties. Perovskites are utilized in a large range of applications due to their tremendous versatility. In this chapter, structure-properties correlations in oxide perovskite compounds ABO3 having several functional properties are presented. In particular, neutron and x-ray diffraction results are described to reveal a direct correlation of several important physical properties, such as magnetic, multiferroic, electronic (CMR), and SOFC electrodes with the crystal structures.
{"title":"Functional Perovskites: Structure-Properties Correlations","authors":"Achintya Bera, S. Yusuf","doi":"10.23647/ca.md20202105","DOIUrl":"https://doi.org/10.23647/ca.md20202105","url":null,"abstract":"The perovskite structure with general formula ABX3 shows its multidimensional nature in regards to correlations of crystal structures with electronic, magnetic, optical, and catalytic properties. Perovskites are utilized in a large range of applications due to their tremendous versatility. In this chapter, structure-properties correlations in oxide perovskite compounds ABO3 having several functional properties are presented. In particular, neutron and x-ray diffraction results are described to reveal a direct correlation of several important physical properties, such as magnetic, multiferroic, electronic (CMR), and SOFC electrodes with the crystal structures.","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81460096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The lead-free unfilled tetragonal tungsten-bronzes SBN and CBN are investigated by Raman, infrared and high-frequency dielectric spectroscopies. The substitution in the different channels affects phonons as well as relaxations. Relaxations in SBN show similar qualitative behaviour on increasing Sr content and relaxor behaviour, but for the extreme relaxor samples all characteristic frequencies are higher with stronger contribution to the permittivity in the GHz-THz range is stronger. The presence of a soft anharmonic central mode in the THz range together with the slowing down of a relaxation from GHz to MHz ranges reveals the coexistence of displacive and order-disorder scenarios for the ferroelectric phase transition in this family.
{"title":"Phonons and relaxations in unfilled tetragonal tungsten-bronzes","authors":"E. Buixaderas, J. Dec","doi":"10.23647/ca.md20202108","DOIUrl":"https://doi.org/10.23647/ca.md20202108","url":null,"abstract":"The lead-free unfilled tetragonal tungsten-bronzes SBN and CBN are investigated by Raman, infrared and high-frequency dielectric spectroscopies. The substitution in the different channels affects phonons as well as relaxations. Relaxations in SBN show similar qualitative behaviour on increasing Sr content and relaxor behaviour, but for the extreme relaxor samples all characteristic frequencies are higher with stronger contribution to the permittivity in the GHz-THz range is stronger. The presence of a soft anharmonic central mode in the THz range together with the slowing down of a relaxation from GHz to MHz ranges reveals the coexistence of displacive and order-disorder scenarios for the ferroelectric phase transition in this family.","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72711480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The dynamic dielectric response of Pb(Mg1/3Nb2/3 )O3 ceramic was experimentally studied as a function of the EAC amplitude field. An increase in real dielectric permittivity was obtained by increasing the applied electrical field within the investigated temperature range for frequencies below 10 kHz. The temperature of maximum dielectric permittivity and freezing temperature decreased with an increase in E AC. Nonlinear permittivity was studied and found to behave similarly to freezing temperature. A statistical model was used to fit the dielectric dispersion of real dielectric permittivity with temperature and frequency. The results are discussed in terms of different factors’ contributions to dielectric permittivity under different EAC field conditions.
{"title":"The effect of an AC electric field on the dielectric properties of Pb(Mg1/3Nb2/3)O3 ceramic","authors":"E. C. Lima, J. Guerra, E. Araújo","doi":"10.23647/ca.md20201706","DOIUrl":"https://doi.org/10.23647/ca.md20201706","url":null,"abstract":"The dynamic dielectric response of Pb(Mg1/3Nb2/3 )O3 ceramic was experimentally studied as a function of the EAC amplitude field. An increase in real dielectric permittivity was obtained by increasing the applied electrical field within the investigated temperature range for frequencies below 10 kHz. The temperature of maximum dielectric permittivity and freezing temperature decreased with an increase in E AC. Nonlinear permittivity was studied and found to behave similarly to freezing temperature. A statistical model was used to fit the dielectric dispersion of real dielectric permittivity with temperature and frequency. The results are discussed in terms of different factors’ contributions to dielectric permittivity under different EAC field conditions.","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74919453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The overview contains basic information about trigonal double molybdates and tungstates MR(XO4)2, representing a crystal family with layered structure. Their structure features networks of corner-linked RO6 octahedra and XO4 Â tetrahedra. Many compounds of this crystal family exhibit ferroelastic phase transitions. Their ferroelastic properties are discussed, with particular emphasis on the peculiarities of the domain structure. An overview of results of studies on ferroelastic phase transitions, obtained with various experimental methods, is provided. Models of trigonal unit cell distortion are presented for monoclinic phases of KSc(MoO4)2 and RbIn(MoO4)2 crystals.
{"title":"Trigonal double molybdates and tungstates: Ferroelastic phase transitions","authors":"M. Zapart, W. Zapart","doi":"10.23647/ca.md20202708","DOIUrl":"https://doi.org/10.23647/ca.md20202708","url":null,"abstract":"The overview contains basic information about trigonal double molybdates and tungstates MR(XO4)2, representing a crystal family with layered structure. Their structure features networks of corner-linked RO6 octahedra and XO4 Â tetrahedra. Many compounds of this crystal family exhibit ferroelastic phase transitions. Their ferroelastic properties are discussed, with particular emphasis on the peculiarities of the domain structure. An overview of results of studies on ferroelastic phase transitions, obtained with various experimental methods, is provided. Models of trigonal unit cell distortion are presented for monoclinic phases of KSc(MoO4)2 and RbIn(MoO4)2 crystals.","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85271012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. García, E. J. Juárez-Pérez, S. Castro-García, M. Sánchez-Andújar, M. A. Señarís-Rodríguez
ABX3 compounds with perovskite structure have been intensively and extensively studied in the last decades in view of their structural richness and amazing variety of interesting properties, such as piezoelectricity, ferroelectricity, ferromagnetism, superconductivity, magnetoresistance, multiferroicity, etc. In this chapter, we recompile well-established chemical and structural concepts in pure inorganic perovskites (mainly oxidic perovskites), and extend them to the young family of hybrid organic-inorganic perovskites. Our final goal is to help understanding the relationships among composition, crystal structure and properties in this new family of compounds, for inspiring further the design of novel materials.
{"title":"Hybrid organic-inorganic perovskites: a spin-off of oxidic perovskites","authors":"A. García, E. J. Juárez-Pérez, S. Castro-García, M. Sánchez-Andújar, M. A. Señarís-Rodríguez","doi":"10.23647/ca.md20202205","DOIUrl":"https://doi.org/10.23647/ca.md20202205","url":null,"abstract":"ABX3 compounds with perovskite structure have been intensively and extensively studied in the last decades in view of their structural richness and amazing variety of interesting properties, such as piezoelectricity, ferroelectricity, ferromagnetism, superconductivity, magnetoresistance, multiferroicity, etc. In this chapter, we recompile well-established chemical and structural concepts in pure inorganic perovskites (mainly oxidic perovskites), and extend them to the young family of hybrid organic-inorganic perovskites. Our final goal is to help understanding the relationships among composition, crystal structure and properties in this new family of compounds, for inspiring further the design of novel materials.","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84627923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Sidorkin, L. Nesterenko, Y. Gagou, P. Saint-Grégoire, A. Pakhomov, N. Popravko
We review dielectric properties of BaZrO3/BaTiO3 (BZ/BT) superlattices deposited on a single-crystal MgO substrate, and having a period of 13.32 nm. These superlattices have specific properties distinguishing them from BZ or BT bulk materials, and from thin films, with a ferroelectric phase transition around 393-395 °?, significantly higher than in bulk samples and thin films of BT, and appearing of second order. The polarization switching occurs in two stages and the precise analysis of experimental data demonstrates that the motion of the domain walls causes the switching processes. We conclude that the mobility of the domain walls decreases on heating. The presence of an internal bias field has been demonstrated and shown to be directed from the superlattice to the substrate, in agreement with an analysis based on the flexoelectric effect. The switching current has been shown to vary in weak fields as 1/E? with the exponent ? much smaller than in thin ferroelectric films. The appearance of the power index ?, which is significantly different from unity, may be due to a decrease in the average value of the switched polarization due to the boundaries between layers of different materials.
{"title":"Dielectric properties and switching processes of ferroelectric superlattices","authors":"A. Sidorkin, L. Nesterenko, Y. Gagou, P. Saint-Grégoire, A. Pakhomov, N. Popravko","doi":"10.23647/ca.md20200906","DOIUrl":"https://doi.org/10.23647/ca.md20200906","url":null,"abstract":"We review dielectric properties of BaZrO3/BaTiO3 (BZ/BT) superlattices deposited on a single-crystal MgO substrate, and having a period of 13.32 nm. These superlattices have specific properties distinguishing them from BZ or BT bulk materials, and from thin films, with a ferroelectric phase transition around 393-395 °?, significantly higher than in bulk samples and thin films of BT, and appearing of second order. The polarization switching occurs in two stages and the precise analysis of experimental data demonstrates that the motion of the domain walls causes the switching processes. We conclude that the mobility of the domain walls decreases on heating. The presence of an internal bias field has been demonstrated and shown to be directed from the superlattice to the substrate, in agreement with an analysis based on the flexoelectric effect. The switching current has been shown to vary in weak fields as 1/E? with the exponent ? much smaller than in thin ferroelectric films. The appearance of the power index ?, which is significantly different from unity, may be due to a decrease in the average value of the switched polarization due to the boundaries between layers of different materials.","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81333968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The Aurivillius layer-structures, described by the general formula Bi2O2(Am-1BmO3m+1), are naturally 2-dimensionally nanostructured. They are very flexible frameworks for a wide variety of applications, given that different types of cations can beaccommodated both at the A- and B-sites. In this review article, we describe how the Aurivillius phases are a particularly attractive class of oxides for the design of prospective single phase multiferroic systems for multi-state data storage applications, as they offer the potential to include substantial amounts of magnetic cations within a strongly ferroelectric system. The ability to vary m yields differing numbers of symmetrically distinct B-site locations over which the magnetic cations can be distributed and generates driving forces for cation partitioning and magnetic ordering. We discuss how out-of-phase boundary and stacking fault defects can further influence local stoichiometry and the extent of cation partitioning in these intriguing material systems.
{"title":"Naturally Layered Aurivillius Phases: Flexible Scaffolds for the Design of Multiferroic Materials","authors":"J. Halpin, L. Keeney","doi":"10.23647/ca.md20202905","DOIUrl":"https://doi.org/10.23647/ca.md20202905","url":null,"abstract":"The Aurivillius layer-structures, described by the general formula Bi2O2(Am-1BmO3m+1), are naturally 2-dimensionally nanostructured. They are very flexible frameworks for a wide variety of applications, given that different types of cations can beaccommodated both at the A- and B-sites. In this review article, we describe how the Aurivillius phases are a particularly attractive class of oxides for the design of prospective single phase multiferroic systems for multi-state data storage applications, as they offer the potential to include substantial amounts of magnetic cations within a strongly ferroelectric system. The ability to vary m yields differing numbers of symmetrically distinct B-site locations over which the magnetic cations can be distributed and generates driving forces for cation partitioning and magnetic ordering. We discuss how out-of-phase boundary and stacking fault defects can further influence local stoichiometry and the extent of cation partitioning in these intriguing material systems.","PeriodicalId":19388,"journal":{"name":"OAJ Materials and Devices","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84626427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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