We report on the oxygen vacancy induced ferromagnetism (FM) at and above room temperature in undoped TiO2 nanoporous nanoribbons synthesized by a solvothermal route. The origin of FM as-synthesized vacuum annealed grown for different reaction durations followed calcinations was investigated several experimental tools. X-Ray diffraction pattern micro-Raman studies reveal TiO2(B), TiO2(B)-anatase, anatase–rutile mixed phases structure. Field emission scanning electron microscopy transmission...

The formation mechanism of graphene quantum dots (GQDs) from a oxide (GO) precursor is elucidated and the inter-conversion edge states in GQDs by annealing under controlled gas environment studied various microscopic spectroscopic tools.

Abstract The desire to reduce secondary pollution from shielded electronics devices demands electromagnetic interference (EMI) shields with high green index (GI), which is the ratio of absorbance over reflectance. Achieving GI values simultaneously shielding effectiveness (SE) 50 dB a serious unresolved challenge. Reducing impedance mismatch between shield and free space key reducing reflection incoming radiation enabling more penetration into body for absorption. Here sandwich structure...

We report on the occurrence of high temperature ferromagnetism (FM) in ZnO nanoparticles (NPs) doped with Co-atoms. NPs two different initial sizes are 3% and 5% Co using ball milling FM is studied at room above. X-ray diffraction high-resolution transmission electron microscopy analysis confirm absence metallic clusters or any other phase from würtzite-type ZnO. UV-visible absorption studies show change band structure photoluminescence green emission 520 nm indicating incorporation Co-atoms...

We report on the high temperature ferromagnetism of Co doped TiO2 nanoparticles (NPs) grown by a ball milling method with two different concentrations (3% and 8%). also investigated structural optical properties as-grown NPs to identify defects which are responsible for observed (FM) at above room (RT). The obtained sizes 35–50 nm were identified as anatase structure no signature Co-cluster or any other oxides x-ray diffraction resolution transmission electron microscopy analysis. Raman...

Determining a suitable noble-metal-free catalyst for hydrogen evolution reaction (HER) by photoelectrocatalytic (PEC) water splitting is an enduring challenge. Here, the molecular origin of number layers and stacking sequence-dependent PEC HER performance MoS2/graphene (MoS2/GR) van der Waals (vdW) vertical heterostructures studied. Density functional theory (DFT) based calculations show that presence MoS2 induces p-type doping in GR, which facilitates adsorption GR side compared to with ΔGH...

Despite decades of research on the role intrinsic defects in enhancing performance reduced TiO2 based materials, unambiguous identification responsible for visible light absorption, and near-infrared (NIR) photoluminescence from undoped has remained challenging. Herein, through situ (PL) studies under a controlled environment, we investigated origin an extended NIR PL emission nanoribbons grown by solvothermal route. Our reveal that oxygen vacancies, Ti3+, F+ center are absorption violet...

We have investigated the microscopic origin of lattice expansion and contraction in undoped rutile TiO2 nanostructures by employing several structural optical spectroscopic tools. Rutile with morphologies such as nanorods, nanopillars nanoflowers, depending upon growth conditions, are synthesized an acid-hydrothermal process. Depending on conditions post-growth annealing, observed it is found to correlate nature density intrinsic defects TiO2. The change volume correlates well bandgap...

We have investigated the structural, optical and ferromagnetic properties of undoped Fe-doped TiO2 nanoribbons (NRbs) grown by a solvothermal method. A strong room temperature ferromagnetism (RTFM) is observed in both NRbs. NRbs exhibited ∼4.8-fold enhancement RTFM as compared to under similar conditions. However, decreases at higher Fe concentration, possibly due antiferromagnetic ordering between nearby Fe3+ ions caused super exchange interaction. X-ray diffraction patterns reveal pure...

Heterogeneous photocatalysis is of overriding significance for emerging energy and environment applications. Nanosized metal–semiconductor heterostructures (HSs) allow extraordinarily tuned intense absorption light, making it very promising efficient solar harvesting in photovoltaic photocatalytic Here we report on the ultrahigh rate photodegradation organic dye, Rhodamine-B, with two distinct sequential degradation processes under visible light illumination Ag nanoparticle (NP) decorated...

Defects play a pivotal role in the device performance of photocatalytic, light-emitting, or photovoltaic system. Herein, graphitic carbon nitride (g-C3N4) nanosheets are prepared at different calcination temperatures, and evolution defects system is studied by positron annihilation spectroscopy (PAS) photoluminescence (PL) spectroscopy. Steady-state PL spectra show that free defect-bound excitonic emission peaked 2.78, 2.58, 2.38 eV dominant with above-band-gap excitation. Time-resolved...

Abstract Layered metal halide perovskites have attracted enormous research attention over the last few years, befitting their unique optical and electronic properties. Low‐dimensional layered demonstrate great potential for various optoelectronic sensing applications beyond photovoltaics. Herein, recent progress opportunities in 2D quasi‐2D light‐emitting diodes (LEDs), lasers, memristors, neuromorphic/synaptic applications, UV–vis photodetection, X‐ray detection, scintillators,...

With the advent of two‐dimensional (2D) van der Waals (vdW) materials, many non‐van (nvdW) materials have been synthesized and are being exploited for novel applications. Bismuth oxychalcogenides (Bi 2 O X; X is S, Se, Te), a nvdW series with moderate band gap semiconductors, possess high carrier mobility air stability. The layers in Bi stay formal bond, giving rise to distinct structural, optical, thermal, electronic properties different from conventional vdW materials. Herein, these...

The development of high-performance and low-cost photodetectors (PDs) capable detecting a broad range wavelengths, from ultraviolet (UV) to near-infrared (NIR), is crucial for applications in sensing, imaging, communication systems. This work presents novel approach printing broadband PD based on heterostructure two-dimensional (2D) molybdenum diselenide (MoSe

We report on the ultra-high rate of photodegradation organic dyes under visible light illumination Ag2O-nanoparticle-decorated (NP) porous pure B-phase TiO2 (TiO2(B)) nanorods (NRs) grown by a solvothermal route. The as-grown TiO2(B) NRs are found to be nanoporous in nature and Ag2O NPs uniformly decorated over its surface, since most pores work as nucleation sites for growth NPs. effective band gap TiO2(B)/Ag2O heterostructure (HS), with weight ratio 1:1, has been significantly reduced 1.68...