This work describes bipolar 2,5-diaryl-1,3,4-oxadiazole–fluorene hybrids which incorporate triphenylamine or carbazole units within the π-electron system, viz. compounds 7, 8, 14 and 16. A related bis(oxadiazolyl)pyridine system 20 is reported. The syntheses of these five new materials are discussed, along with their optoelectronic absorption emission properties, solution electrochemical redox properties. Anodic electropolymerisation was observed. Calculations using DFT (density functional...

Herein, we report the ambient synthesis of CdSe nanoparticles widely tunable particle size by a solution route. The proposed protocol uses hydrazine hydrate to form an air-stable complex selenium. These are characterized X-ray diffraction, FTIR, optical absorption, photoluminescence, and transmission electron microcopy measurements. By varying molarities Cd(2+) Se(2-) ions in with 3-mercaptopropionic acid as capping ligand, method permits us synthesize ranging from 1.58 3.42 nm (estimated...

The depletion of nonrenewable energy sources insisted the search for new types solutions. Thermoelectric conversion is one possible solution which converts waste heat into useful electricity. In past several years, thermoelectric research developed many novel materials. Among these, most practically materials with better performance are based on Bi, Pb, Te, and Sb, but toxic expensive. There a need earth‐abundant, low‐cost, less‐toxic compounds superior so as to realize large‐scale...

Abstract Earth‐abundant and non‐toxic materials are important in the utilization of thermoelectric technology. Here, behavior copper iodide (CuI), which is prepared bulk using a simple synthetic approach, reported. The as‐prepared CuI has high Seebeck coefficient ≈431 μV K −1 with resistivity ≈0.26 Ω cm , resulting room temperature power factor ≈70 μW m −2 . properties tuned by changing defect chemistry via thermal annealing. Annealing at moderate temperatures (≈400 K) improves factor, from...

We show that the transient ion drift (TID) method, which is based on recording junction capacitance under constant reverse bias [A. Zamouche, T. Heiser, and A. Mesli, Appl. Phys. Lett. 66, 631 (1995)], can be used not only for measurements of diffusion coefficient mobile impurities, but also to estimate concentration species as part total dopant density. This illustrated CdTe, contaminated by Cu, intentionally doped Li or Ag CuInSe2. that, with some restrictions, TID method if ions are major...

Electrocatalytic and photocatalytic water splitting are effective pathways for energy conversion to overcome from the reliance on depletion fossil fuels preclude severe degradation of global climate. The review begins with basic principle mechanisms involved in both electro/photocatalysis splitting. Graphitic carbon nitride (g‐C 3 N 4 ) is an interesting catalyst due its layered conjugated metal free semiconductor, owing unique physicochemical characteristics. However improve some features...

Surface states of solids provide a unique way to graft organic molecules into monolayers by simple dip chemistry. Such interfaces can be highly functional and serve as foundation for the formation precisely controlled nanostructures other materials via atomic/molecular diffusion, adsorption, growth. The coverage, orientation, consistency, functionality these easily tailored create technologically important materials. On hand, research on batteries has skyrocketed in recent times due paradigm...

Silicon surface was chemically modified by covalent attachment of homologous organic molecules having different dipole moments. Surface photovoltage measurements clearly confirm that have a profound effect on band bending semiconductor. Metal-molecules--silicon junctions were constituted for belonging to ethynylbenzene series using soft mercury contact. These show systematic change in the electrical charge transport with moment molecules. Parameters such as ideality factor, barrier height,...

Bioconjugated CdS nanoparticles capped with L-cysteine molecules are prepared by an aqueous route. A new source of sulfur that is a complex hydrazine hydrate–sulfur used to develop the synthesis these nanoparticles. The change in volume ratio and cadmium ions fixed molarity capping molecules, as colloids exhibits different colours. These characterized optical absorption, photoluminescence, FTIR, x-ray diffraction transmission electron microscopic measurements. It observed present technique...

Abstract The hazardous Rhodamine‐B dye is photocatalytically degraded by anatase TiO 2 and its graphene nanocomposites. These are prepared a simple electrochemical anodic dissolution of pure titanium in oxide solution, here particle size tuned current variation. structural, morphological optical properties these composites studied X‐ ray diffraction, UV‐visible spectroscopy, field emission SEM, high resolution TEM XPS. photocatalytic activity water with visible UV light irradiation. A...

The present study has been aimed to understand the role of electrode material, its surface modification by organic molecules, solvent and analyte in an electrochemical cell on cyclic voltammograms.To these effects, different cells were constituted using solvents thiol measure voltammograms.The measurements clearly show that parameters are significantly important ones dictating nature observed effect scan rate voltammograms with various rates.A plot Randles-Sevcik equation yield a straight...

Copper sulfide is a low-cost and non-toxic material which very attractive promising for various applications. There need of large-scale production this by simple methods. Here, ambient method proposed preparation copper sulfide. The synthesis carried out at room temperature using ultrasonication where the elemental precursors, sulfur are directly used. present gives gram scale with high yield in short period time. materials characterized different techniques, their electrical conductivity...

Abstract In this work, a simple two step synthesis of Titanium dioxide / Reduced graphene oxide Copper sulfide (TiO 2 /rGO/CuS) and its improved photocatalytic activity is reported. TiO /rGO prepared by electrochemical anodization Ti metal in NaCl‐graphene solution as an electrolyte. Later CuS incorporated to form the composite /rGO/CuS chemical precipitation at room temperature. The optical properties, phase morphology material characterized UV‐visible spectroscopy, X‐ ray diffraction,...

Thermoelectric energy conversion technology has received significant attention because of its promising applications and environmentally clean nature. The innovative design efficient thermoelectric materials is assisted by simple reliable techniques for fast accurate testing. Here, a approach rapid measurement the Seebeck coefficient described using commonly available based on hot cold probes; both probes are heated built-in microheaters. A spring-loaded sample mounting arrangement provides...

Molybdenum disulphide (MoS 2 ), an ideal semiconductor, belongs to the group of 40 well‐identified transition metal dichalcogenides. These have unique chemical bonding; in case they do not feature dangling bonds and hence possess a layered‐like atomic structure, such that strong intraplane weak interplane bondings exist. Hence, MoS can be peeled into precisely controlled number layers; bulk with E g = 1.2 eV reduced unit cell‐thick layer (monolayer) 1.89 eV. However, reality, both monolayers...