Samrat Ghosh

Visible-light-driven hydrogen (H₂) production from water is a promising strategy to convert and store solar energy as chemical energy. Covalent organic frameworks (COFs) are front runners among different classes of organic photocatalysts. The photocatalytic activity of COFs depends on numerous factors such as the electronic band gap, crystallinity, surface area, exciton migration, stability of transient species, charge separation and transport, etc. However, it is challenging to fine

π-Gels are a promising class of functional soft materials formed out of short π-conjugated molecules. By utilizing the chemistry of noncovalent interactions, researchers have created a wide range of π-gels that are composed of supramolecular polymers. During the last two decades, supramolecular gel chemistry has been pursued with the hope of developing new materials for applications in, for example, organic electronics, energy harvesting, sensing, and imaging. The high expectations for π-gels we

The global energy crisis and environmental concerns are driving research into renewable energy and sustainable energy conversion and storage technologies. Solar energy, as an ideal sustainable resource, has significant potential to contribute to the goal of net-zero carbon emissions if effectively harnessed and converted into a reliable and storable form of energy. Photocatalysts have the potential to convert sunlight into chemical energy carriers. In this respect, covalent organic frameworks (C

Hydrogen peroxide (H2O2), a valuable chemical, is widely used as a powerful oxidizing agent in chemical synthesis, pharmaceuticals, medical disinfection, and environmental treatment industries. Currently, over 95% of H2O2 is produced industrially using the anthraquinone process, which is associated with its high energy consumption and hazardous byproducts. Therefore, the photochemical synthesis of H2O2 from water and oxygen using covalent organic framework based photocatalysts have attracted con

A tunable topology and a porous network make π-conjugated covalent organic frameworks (COFs) a new class of organic semiconductors for optoelectronic, smart sensing, and catalytic applications. Although some of the COFs exhibit enhanced electric conductivity with a high charge carrier mobility, the nature and pathways of charge transport still remain elusive. In order to unveil the transport mechanism, herein, we have developed crystalline π-conjugated COFs using planar building blocks, and a wa

Visibly opaque but near-infrared (NIR)-transparent materials are an essential component for night-vision photography, security imaging, and forensic applications. Herein, the development of a novel supramolecular black dye from a diketopyrrolopyrrole (DPP)-based low-molecular-weight organogelator is described. In the solution state, the monomer of DPP-Amide exhibits a deep green color with a broad absorption in the visible region due to firm intramolecular charge transfer from the donor to the a

A contrasting photocatalytic mechanism was observed for semiconducting covalent organic frameworks (COFs). J-type aggregation favors exciton migration in the powder state, while charge transport governs the photocatalytic activity in the films.

The linker position dramatically affects the optoelectronic performance of π-conjugated two-dimensional polymers even though the polymers have the same π-conjugated backbone.

Iron-rich Ruddlesden–Popper phases Sr3Fe2 − xCoxO7 − y (x ≤ 1) have been synthesized by two citrate precursor techniques and investigated in order to explore the correlation between electron transport properties, electronic state, magnetism, and magnetoresistance effects in iron(IV) based oxides. The materials were characterized by X-ray powder diffraction, temperature and field dependent magnetization measurements, magnetotransport studies, and iron-57 Mössbauer spectroscopy. With increasing co

Organic semiconductors with variable charge carrier polarity are required for optoelectronic applications. Herein, we report the synthesis of three novel diketopyrrolopyrrole (DPP)-based D-A molecules having three different terminal groups (amide, ester, and dicyano) and study their electronic properties. An increase in electron acceptor strength from amide to dicyano leads to a bathochromic shift in absorption. Photoconductivity and field effect transistor (FET) measurements confirmed that a sm

<div>Visible light driven hydrogen (H2) production from water is a promising strategy to convert and store solar energy as chemical energy. Covalent organic frameworks (COFs) are front runners among different classes of organic photocatalyst, owing to their tunable porosity, crystallinity, optical and electronic properties. Photocatalytic activity of COFs depends on numerous factors such as band gap, crystallinity, porosity, exciton migration, charge separation and transport, stability etc

A simple low temperature synthesis route has been presented of preparing nanosized, single phased LaFeO(3), La((1-x))Sr(x)FeO(3) (x = 0.3, 0.5) and La((1-x))Sr(x)Co(0.2)Fe(0.8)O(3) (x = 0.2, 0.4) for cathode applications in ITSOFC. A soft chemical method has been applied, using tartaric acid as a template material and nitric acid as an oxidizing agent. Phase pure materials were obtained at temperatures ranging from 550 degrees C to 700 degrees C. The synthesized powders were characterized by TGA

Tailormade bottom-up synthesis of covalent organic frameworks (COFs) from various functional building blocks offer not only tunable topology and pore size but also multidimensional properties. High crystallinity is one of the prerequisites for their structures and associated physicochemical properties. Among different π-conjugated motifs for constructing COFs, pyrene-based tetragonal structures are effective in achieving highly ordered and crystalline states. In the present research, we demonstr