Transparent heat regulating (THR) materials and coatings for energy saving window applications: Impact of materials design, micro-structural, and interface quality on the THR performance

The first description on the capacitive behavior of Eu-doped CaTiO3 analyzed by adopting cyclic voltammetry (CV), galvanostatic charge/discharge studies (GCD), and electrochemical impedance spectroscopy (EIS) technique is submitted. The present work focused on the synthesis of perovskite type of CaTiO3 and Eu-doped CaTiO3 via simple wet chemical method. The prepared samples were characterized using various spectral and analytical techniques, viz., XRD, FT-IR, SEM, EDX, UV-DRS, and HR-TEM. The electrodes constructed using CaTiO3 and Eu-doped CaTiO3 were tested by CV, GCD, and EIS with an aid of a three-electrode system, composed of the electroactive material as working electrode, Ag/AgCl as reference electrode, and platinum wire as counter electrode in 1 M aqueous KOH as electrolyte. The pronounced specific capacitance (Csp) of 274 F g−1 was observed at 1 A g−1 current density. Furthermore, the synthesized materials showed capacitance retention of 93% even after 2000 charge/discharge cycles. Thus, CaTiO3 and Eu-doped CaTiO3 were found to be significant for energy storage applications.

Facile synthesis of Eu-doped CaTiO3 and their enhanced supercapacitive performance

Both, novel and older widely and routinely used methods of chemical synthesis fornew multifunctional inorganic (nano) materials with different sizes and morphologies are reviewed and summarized in this chapter. Illustrative examples of micro- and nanoparticle preparations are provided regarding different applications: renewable and sustainable energy harvesting, water splitting and hydrogen generation, fuel and solar cell devices, luminescent materials for white light–emitting diodes and clean environment. We give our perspective on the current status of the topic: methods of colloidal chemistry, coprecipitation, reverse-micelle technique, sol–gel, spray pyrolysis, microwave-assisted hydrothermal/solvothermal method, and high-temperature solid-state method are covered in more detail and more emphasis is placed on methods of synthesis, steps involved in experimental procedure and applicability, advantages, and disadvantages of each synthetic approach.

Synthesis of Multifunctional Inorganic Materials: From Micrometer to Nanometer Dimensions

Future-generation neuromorphic computing seeks to overcome the limitations of von Neumann architectures by co-locating logic and memory functions, thereby emulating the function of neurons and synapses in the human brain. Despite remarkable demonstrations of high-fidelity neuronal emulation, the predictive design of neuromorphic circuits starting from knowledge of material transformations remains challenging. VO2 is an attractive candidate since it manifests a near-room-temperature, discontinuous, and hysteretic metal-insulator transition. The transition provides a nonlinear dynamical response to input signals, as needed to construct neuronal circuit elements. We discuss strategies for tuning the transformation characteristics of VO2 based on modification of material properties, interfacial structure, and field couplings. Dynamical modulation of transformation characteristics through in-situ material processing is discussed as a means of imbuing synaptic function. We emphasize mechanistic understanding of site-selective modification; external, epitaxial, and chemical strain; defect dynamics; and interfacial field coupling in modifying local atomistic structure, the implications therein for electronic structure, and ultimately, the tuning of transformation characteristics. We highlight opportunities for inverse design and for using design principles related to thermodynamics and kinetics of electronic transitions learned from VO2 to inform the design of new Mott materials, as well as to go beyond energy-efficient computation to manifest intelligence. This article is protected by copyright. All rights reserved.

Harnessing the Metal-Insulator Transition of VO2 in Neuromorphic Computing.

Investigation of a novel (GO@CuO.γ-Al2O3) hybrid nanocomposite for solar energy applications

Mercury(II), which is a well-known toxic species, exists in the industrial waste water in many cases. In the present work, CdTe quantum dots (QDs) are studied as a fluorescence probe for Hg2+ detection. Ag ions are induced to QDs to enlarge their detection concentration range. L-cysteine is employed in the QD-based fluorescence probe to connect QDs with Hg2+. X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy results indicate the formation of zinc blende CdTe QDs with sizes of ∼5 nm and the existence of Ag+ in crystalline CdTe. Photoluminescence (PL) spectra and PL decay spectra were acquired to investigate the emission mechanism of Ag-doped CdTe QDs, revealing multi-emission in QD samples with higher concentrations of Ag+ doping. The highest PL quantum yield of the QD samples was 59.4%. Furthermore, the relationship between the fluorescence intensity and the concentration of Hg2+ has been established. Two linear relationships were obtained for the plot of F/F0 against Hg2+ concentration, enlarging the detection concentration range of Hg2+.

/pdf/silver-ion-doped-cdte-quantum-dots-as-fluorescent-probe-for-54y4xs4u4g.pdf

Silver ion-doped CdTe quantum dots as fluorescent probe for Hg2+ detection

Strategy for performance enhancement of Cd1-XZnXTe/CdS core/shell quantum dot sensitized solar cells through band adjustment

Color‐tunable and white emission of Tm3+ doped transparent zinc silicate glass‐ceramics embedding ZnO nanocrystals

Size-controlled hematite mesocrystals were prepared by forced hydrolysis of FeCl3via a facile hydrothermal process. The particle size of the hematite mesocrystals were well-controlled by the ratio of ethanol to water. As the ratio of ethanol increased, the particle size of the hematite mesocrystals increased from 0.5 to 1.5 μm without losing their internal mesocrystalline structure. The sizes of the hematite particles were also affected by the concentrations of KOH and formic acid. Goethite rods were prepared with 0.26 M KOH.

Size-controlled synthesis of hematite mesocrystals

A top-down synthetic method was developed for the fabrication of sponge-like Mn3O4 composed of Mn3O4 nanocrystals by decomposition of manganese formate at 200 °C. The samples were characterized in terms of their structural and morphological properties by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer–Emmett–Teller (BET) studies. TEM and SEM images showed that the morphology of sponge-like Mn3O4 structures was mostly retained from the morphology of the manganese formate precursor, which was controlled by the solvothermal process. Large sponge-like Mn3O4 structures exhibiting crystallographic symmetry were prepared under solvothermal treatment for a long time. The XRD pattern showed that the Mn3O4 exhibit a tetragonal hausmannite structure. The results of N2 adsorption analysis indicated that the sponge-like Mn3O4 nanostructures possess high surface area. The possible formation mechanism of Mn3O4 nanostructures has been discussed.

/pdf/top-down-synthesis-of-sponge-like-mn3o4-at-low-temperature-3k9ptmk6pj.pdf

Top-down synthesis of sponge-like Mn3O4 at low temperature

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