Green Approach for the Synthesis of 2-Phenyl-2-indazoles and Quinazoline Derivatives Using Sustainable Heterogeneous Copper Oxide Nanoparticles Supported on Activated Carbon and OER Study.

This research work reports the synthesis of copper oxide (CuO) nanoparticles supported on activated carbon by a simple impregnation method using 2-propanol as a green solvent, followed by calcination. The synthesized CuO@C is used as an efficient heterogeneous nanocatalyst for the synthesis of 2-indazoles and quinazolines utilizing commercially available 2-bromobenzaldehydes, primary amines, and sodium azide under ligand-free and base-free conditions. The present methodology demonstrates the formation of new N-N, C-N, and C═N bonds under one-pot reaction conditions using PEG-400 as a green solvent.

Unveiling the Hidden Potential of Two-Dimensional Black Phosphorus for Advanced Supercapacitor Applications.

In response to the contemporary energy crisis, researchers have intensified efforts to explore green and renewable energy sources alongside developing robust energy storage devices. Supercapacitors stand out among various storage options due to their high-power density and rapid charge-discharge cycles. However, their lower energy density poses a challenge, leading to exploration of diverse electrode materials, including black phosphorus (BP).

2H-SnS assembled with petaloid 1T@2H-MoS nanosheet heterostructures for room temperature NO gas sensing.

In this study, we explored the gas-sensing capabilities of MoS petaloid nanosheets in the metallic 1T phase with the commonly investigated semiconducting 2H phase. By synthesizing SnS nanoparticles and MoS petaloid nanosheets through a hydrothermal method, we achieve notable sensing performance for NO gas at room temperature (27 °C). This investigation represents a novel study, and to the best of our knowledge no, prior similar investigations have been reported in the literature for 1T@2HMoS/SnS heterostructures for room temperature NO gas sensing.

Electrochemical Deposition for Cultivating Nano- and Microstructured Electroactive Materials for Supercapacitors: Recent Developments and Future Perspectives.

The globe is currently dealing with serious issues related to the world economy and population expansion, which has led to a significant increase in the need for energy. One of the most promising energy devices for the next generation of energy technology is the supercapacitor (SC). Among the numerous nanostructured materials examined for SC electrodes, inorganic nanosheets are considered to be the most favorable electrode materials because of their excellent electrochemical performance due to their large surface area, very low layer thickness, and tunable diverse composition.

Correction: Conducting polymers: a comprehensive review on recent advances in synthesis, properties and applications.

[This corrects the article DOI: 10.1039/D0RA07800J.].

Recent Developments and Future Perspectives of Molybdenum Borides and MBenes.

Metal borides have received a lot of attention recently as a potentially useful material for a wide range of applications. In particular, molybdenum-based borides and MBenes are of great significance, due to their remarkable properties like good electronic conductivity, considerable stability, high surface area, and environmental harmlessness. Therefore, in this article, the progress made in molybdenum-based borides and MBenes in recent years is reviewed.

Construction of Nickel Molybdenum Sulfide/Black Phosphorous 3D Hierarchical Structure Toward High Performance Supercapacitor Electrodes.

Supercapacitors (SCs) with outstanding versatility have a lot of potential applications in next-generation electronics. However, their practical uses are limited by their short working potential window and ultralow-specific capacity. Herein, the facile one-step in-situ hydrothermal synthesis is employed for the construction of a NiMoS/BP (black phosphorous) hybrid with a 3D hierarchical structure.

Electrostatic co-assembly of FePS nanosheets and surface functionalized BCN heterostructures for hydrogen evolution reaction.

Advances in the hydrogen evolution reaction (HER) are intricately connected with addressing the current energy crisis and quest for sustainable energy sources. The necessity of catalysts that are efficient and inexpensive to perform the hydrogen evolution reaction is key to this. Following the ground-breaking discovery of graphene, metal thio/seleno phosphates (MPX: M - transition metal, P - phosphorus and X - S/Se), two dimensional (2D) materials, exhibit excellent tunable physicochemical, electronic and optical properties, and are expected to be key to the energy industry for years to come.

Borocarbonitride-Based Emerging Materials for Supercapacitor Applications: Recent Advances, Challenges, and Future Perspectives.

Supercapacitors have emerged as a promising energy storage technology due to their high-power density, fast charging/discharging capabilities, and long cycle life. Moreover, innovative electrode materials are extensively explored to enhance the performance, mainly the energy density of supercapacitors. Among the two-dimensional (2D) supercapacitor electrodes, borocarbonitride (BCN) has sparked widespread curiosity owing to its exceptional tunable properties concerning the change in concentration of the constituent elements, along with an excellent alternative to graphene-based electrodes.

Advances in solar energy harvesting integrated by van der Waals graphene heterojunctions.

Graphene has garnered increasing attention for solar energy harvesting owing to its unique features. However, limitations hinder its widespread adoption in solar energy harvesting, comprising the band gapless in the molecular orbital of graphene lattice, its vulnerability to oxidation in oxidative environments, and specific toxic properties that require careful consideration during development. Beyond current challenges, researchers have explored doping graphene with ionic liquids to raise the lifespan of solar cells (SCs).

Room-temperature chemiresistive ammonia sensors based on 2D MXenes and their hybrids: recent developments and future prospects.

Detection of ammonia (NH) gas at room temperature is essential in a variety of sectors, including pollution monitoring, commercial safety and medical services, Two-dimensional (2D) materials have emerged as fascinating candidates for gas-sensing applications due to their distinct properties. MXenes, a type of 2D transition metal carbides/nitrides/carbonotrides, have drawn the interest of researchers due to their high conductivity, large surface area, and changing surface chemistry. The review begins by describing the NH gas-detecting methods of 2D materials and then concentrates on MXene-based sensors, emphasising the benefits that MXenes provide in this context.

Recent developments in 2D MXene-based materials for next generation room temperature NO gas sensors.

MXenes with distinctive structures, good electrical conductivity and abundant functional groups have shown great potential in the fabrication of high performance gas sensors. Since the sensing mechanism of MXene-based gas sensors often involves a surface-dominant process, they can work at room temperature. In this regard, a significant amount of research has been carried out on MXene-based room temperature gas sensors and they can be viewed as one of the possible materials for NO sensing applications in the future.

Defect-Engineering of 2D Dichalcogenide VSe to Enhance Ammonia Sensing: Acumens from DFT Calculations.

Opportune sensing of ammonia (NH) gas is industrially important for avoiding hazards. With the advent of nanostructured 2D materials, it is felt vital to miniaturize the detector architecture so as to attain more and more efficacy with simultaneous cost reduction. Adaptation of layered transition metal dichalcogenide as the host may be a potential answer to such challenges.

Recent Developments and Future Perspective on Electrochemical Glucose Sensors Based on 2D Materials.

Diabetes is a health disorder that necessitates constant blood glucose monitoring. The industry is always interested in creating novel glucose sensor devices because of the great demand for low-cost, quick, and precise means of monitoring blood glucose levels. Electrochemical glucose sensors, among others, have been developed and are now frequently used in clinical research.

Rational design of selenium inserted 1T/2H mixed-phase molybdenum disulfide for energy storage and pollutant degradation applications.

MoSbased materials are recognized as the promising candidate for multifunctional applications due to its unique physicochemical properties. But presence of lower number of active sites, poor electrical conductivity, and less stability of 2H and 1T MoSinherits its practical applications. Herein, we synthesized the Se inserted mixed-phase 2H/1T MoSnanosheets with abundant defects sites to achieve improved overall electrochemical activity.

High performance asymmetric supercapacitors based on TiCT MXene and electrodeposited spinel NiCoS nanostructures.

Spinel metal sulfides have been investigated for a wide range of applications mostly in electrochemical energy storage owing to their better electronic conductivity and high reversible redox activity. Herein, we report a facile fabrication approach for the binder-free supercapacitor electrodes based on spinel NiCoS (NCS) on various substrates such as Cu-foil (CF), Ni-foam (NF), and vertical graphene nanosheets grown on carbon tape (VG) a single step-controlled electrodeposition technique. The obtained electrodeposited NiCoS grown on Cu-foil (denoted as CF-NCS) in symmetric assembly shows a high specific capacitance of 167.

Effect of cobalt doping on the enhanced energy storage performance of 2D vanadium diselenide: experimental and theoretical investigations.

Vanadium Diselenide (VSe) is a prominent candidate in the 2D transition metal dichalcogenides family for energy storage applications. Herein, we report the experimental and theoretical investigations on the effect of cobalt doping in 1T-VSe. The energy storage performance in terms of specific capacitance, stability and energy and power density is studied.

Unveiling and engineering of third-order optical nonlinearities in NiCoO nanoflowers.

In this Letter, we demonstrate for the first time, to the best of our knowledge, (NCO) as a novel nonlinear optical material with straightforward potential applications in optical limiting. For the 532 nm nanosecond laser, excited state absorption (ESA) and free-carrier absorption give rise to large ESA coefficient () and positive nonlinear . On the other hand, when excited with the 800 nm femtosecond laser, two-photon absorption (TPA) takes place, and bound carriers induce strong negative .

Spinel NiFeO nanoparticles decorated 2D TiC MXene sheets for efficient water splitting: Experiments and theories.

Design and demonstration of cost-effective, robust, and earth-abundant electrocatalysts for efficient water splitting have attracted a great deal of interest. Herein, we have decorated NiFeO nanoparticles on the emerging novel two-dimensional (2D) TiC (MXene) sheets in order to achieve better electrocatalytic performance for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The synthesized NiFeO/TiC composite showed extraordinary kinetic metrics for electrocatalytic OER, revealing a low overpotential of 266 mV at a current density of 10 mA/cm, and a small Tafel slope of 73.

Enhanced energy storage performance and theoretical studies of 3D cuboidal manganese diselenides embedded with multiwalled carbon nanotubes.

The burst of energy produced from the sustainable energy sources need to be harnessed by energy storage systems. Development of novel and advanced energy storage devices such as supercapacitors discover an enormous future ahead. Recently, hybrid supercapacitors (electric double layer capacitor (EDLC) and pseudocapacitors) trend to be used as energy storage interfaces for their improved efficacy in energy density without altering the power density.

Conducting polymers: a comprehensive review on recent advances in synthesis, properties and applications.

Conducting polymers are extensively studied due to their outstanding properties, including tunable electrical property, optical and high mechanical properties, easy synthesis and effortless fabrication and high environmental stability over conventional inorganic materials. Although conducting polymers have a lot of limitations in their pristine form, hybridization with other materials overcomes these limitations. The synergetic effects of conducting polymer composites give them wide applications in electrical, electronics and optoelectronic fields.

Magnetic gas sensing: working principles and recent developments.

Gas sensors work on the principle of transforming the gas adsorption effects on the surface of the active material into a detectable signal in terms of its changed electrical, optical, thermal, mechanical, magnetic (magnetization and spin), and piezoelectric properties. In magnetic gas sensors, the change in the magnetic properties of the active materials is measured by one of the approaches such as Hall effect, magnetization, spin orientation, ferromagnetic resonance, magneto-optical Kerr effect, and magneto-static wave oscillation effect. The disadvantages of different types of gas sensors include their chemical selectivity and sensitivity to humidity and high-temperature operation.

Energy storage performance of 2D MoS and carbon nanotube heterojunctions in symmetric and asymmetric configuration.

Excellent cyclic stability and fast charge/discharge capacity demonstrated by supercapacitors foster research interest into new electrode materials with 100% cycle life and high specific capacitance. We report an improvement in the electrochemical performance of MoS/multiwalled carbon nanotubes (MWCNT) nanohybrid and intensively explored its performance in symmetric and asymmetric supercapacitor (ASC) assembly. The symmetric assembly of MoS/MWCNT exhibits capacitance of around 274.

Theoretical Insight on the Biosensing Applications of 2D Materials.

The research on the design of efficient, reliable, and cost-effective biosensors is expanding given its high demand in various fields such as health care, environmental surveillance, agriculture, diagnostics, industries, and so forth. In the last decade, various fascinating and interesting 2D materials with extraordinary properties have been experimentally synthesized and theoretically predicted. 2D materials have been explored for the sensing of different biomolecules because of their large surface area and strong interaction with different biomolecules.