In this paper we report the structural and property (magnetic electrical transport) measurements of nanocrystals half-doped ${\text{La}}_{0.5}{\text{Ca}}_{0.5}{\text{MnO}}_{3}(\text{LCMO})$ synthesized by chemical route, having particle size down to an average diameter 15 nm. It was observed that reduction leads change in crystal structure, room temperature structure is arrested so does not evolve on cooling unlike bulk samples. The mainly affects orthorhombic distortion lattice. By making...

Wide band gap metal oxide semiconductors such as zinc (ZnO) show visible photolysis that has been employed, among others, to degrade harmful organic contaminants into harmless mineral acids. Metal oxides enhanced photocatalytic activity with the increase in electronic defects crystallites. By introducing crystal lattice of ZnO nanoparticles, we observe a redshift optical absorption shifting from ultraviolet region (400–700 nm), which is due creation intermediate defect states inhibit...

We report a textile-based lead-free halide perovskite-based gas sensor to detect ammonia at ambient temperature. The uses methylammonium tin iodide (CH3NH3SnI3 or MASnI3 MASI) as the active material grow in fabric substrates using one-step low-temperature (∼100 °C) solution processing. as-fabricated can trace by both visual color change methods and electrical readout. maximum calibrated sensitivity based on readout of is ∼85% exposure 100 ppm gas. be operated 2 V bias with an output current...

Surface modification can have a significant influence on the materials behavior at nanoscale and lead to nanostructures with novel properties. Here, we demonstrate surface induced multiple photoluminescence room temperature ferromagnetic activation of Mn3O4 nanoparticles (NPs). Employing systematic variation ligands, their functional groups structural position groups, identified necessary sufficient requirements co-ordinating in order induce unprecedented optical/magnetic responses from NPs....

A comprehensive study of the temperature ($T$) and magnetic field ($H$) dependence entropy change ($\ensuremath{\Delta}{S}_{M}$) for different materials exhibiting inverse magnetocaloric effect (IMCE) is reported. We show that $\ensuremath{\Delta}{S}_{M}$ follows a power-law $H$ ($\ensuremath{\Delta}{S}_{M}$ \ensuremath{\sim} ${H}^{n}$; $n$ an exponent) these compounds. In contrast to conventional (CMCE), independent $T$ in case IMCE. As result, universal master curve can be constructed...

We show that a cheap, disposable type rapid paper sensor (working at room temperature) can be made using perovskite halide CH3NH3PbI3 (MAPI) to detect presence of the toxic ammonia gas (NH3)by just color change, where black colored MAPI film (on paper) changes yellow in very low concentration NH3 gas. The open or closed atmosphere down around 10 ppm with response time nearly sec which decreases few seconds when exceeds 20 ppm. easy fabricate being visual does not need any other extra...

Magnetic topological semimetals have interesting anomalous behavior and can be manipulated by tuning the symmetry-protected nodal crossings. ${\mathrm{Co}}_{2}$-based full Heusler compounds serve as a fertile playground where various novel properties investigated. In this paper, we present systematic investigation of Hall effect (AHE) in ferromagnetic compound ${\mathrm{Co}}_{2}\mathrm{CrGa}$ using combined experimental theoretical studies. The resistivity ${\ensuremath{\rho}}_{yx}^{A}$ is...

We have investigated the Jahn-Teller transition accompanied by orbital order-disorder in ${\mathrm{LaMnO}}_{3}$ high temperature x-ray powder diffraction with synchrotron radiation and also neutron diffraction. The unit cell volume of decreases increasing a narrow range below ${T}_{\mathrm{JT}}\ensuremath{\approx}750\mathrm{K},$ then undergoes collapse at ${T}_{\mathrm{JT}}.$ interpret this effect as due to more efficient packing ${\mathrm{MnO}}_{6}$ octahedra orbitally disordered or liquid...

At high temperatures both the resistivity $(\ensuremath{\rho})$ and thermopower of ${\mathrm{La}}_{1\ensuremath{-}x}{M}_{x}{\mathrm{MnO}}_{3}$ $(M=\mathrm{Ba},$ Sr, Ca) single crystals can be described well by a small-polaron hopping model. The polaron binding energy decreases while orbital ordering transition ${(T}_{\mathrm{JT}})$ to state with static Jahn-Teller distortion increases as ionic size M reduces from Ba Ca. With doping $(x),$ ${T}_{\mathrm{JT}}$ Curie temperature ${T}_{C}$...

We report a detailed investigation of the magnetocaloric properties self-doped polycrystalline LaMnO(3+δ) with δ = 0.04. Due to self-doping effect, system exhibits magnetic transition from paramagnetic ferromagnetic-like canted state (CMS) at ~120 K, which is associated an appreciably large effect (MCE). The CMS inhomogeneous phase developing due steady growth antiferromagnetic correlation in its predominant ferromagnetic below ∼120 K. stabilization this material concluded comprehensive...

We report molecular functionalization of the promising manganite nanoparticles La0.67Sr0.33MnO3 (LSMO) for their solubilization in aqueous environments. The individual NPs with biocompatible citrate ligand, as confirmed by Fourier transform infrared (FTIR) spectroscopy, reveals that citrates are covalently attached to surface NPs. UV-VIS spectroscopic studies on functionalized an optical band visible region. Uniform size selectivity (2.6 nm) process is from high resolution transmission...

We report a ZnO/Silicon nanowire (ZnO/Si NWs) heterojunction array-based NO gas sensor operating at room temperature with an extremely high response (noise limited ∼10 ppb). The shows very selectivity towards sensing and perturbation in due to the presence of moisture. has been fabricated by using cost-effective chemical processing that is compatible wafer-level processing. vertically aligned Si NWs array made electroless etching method ZnO nanostructure was solution deposition spin-coating....

Herein, we report the emergence of multicolor photoluminescence in a mixed-valence manganite nanoparticle La0.67Sr0.33MnO3 (LSMO NP) achieved through electronic structural modification nanoparticles upon functionalization with biocompatible organic ligand, sodium tartrate. From UV–vis absorption, X-ray photoelectron spectroscopy (XPS), time-resolved study, and Raman spectroscopic measurements, it is revealed that ligand-to-metal charge transfer transitions from highest occupied molecular...

We report here the growth and characterization of functional oxide nanowire hole doped manganite La 0.5 Sr MnO 3 (LSMO). also four‐probe electrical resistance measurement a single LSMO (diameter ~45 nm) using focused ion beam (FIB) fabricated electrodes. The wires are by hydrothermal method autoclave at temperature 270 °C. elemental analysis physical property like resistivity studied an individual level. quantitative determination Mn valency mapping constituent elements done Electron Energy...

The surface/interface properties, especially interfacial states, have a key impact on overall carrier generation, recombination/transport, and/or collection proficiency for heterostructure-based photodetectors. This study demonstrates the significant enhancement of ultraviolet–near infrared (UV-NIR) (300–1100 nm) broadband photodetection in heterostructure array p-Si NWs/ZnO photodetectors with engineering charge transportation under different processing conditions. In case pulsed laser...

The resistivity $\ensuremath{\rho}$ has been measured up to 900 K in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ $(0<~x<~0.15)$ single crystals investigate the nature of charge transport phenomena both above and below cooperative Jahn-Teller orbital-ordering temperature ${(T}_{\mathrm{JT}}).$ At high temperatures ${T}_{\mathrm{JT}},$ is almost independent for ${\mathrm{LaMnO}}_{3}$ whereas exhibits a strong dependence $x>0$ samples. In orbitally ordered...

We have systematically investigated transport, magnetic, and structural properties of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ba}}_{x}{\mathrm{CoO}}_{3}$ in the range doping $0<x\ensuremath{\leqslant}0.55$. In this system, metal-insulator transition is observed to be coincident with onset ferromagnetic (FM) ordering at $x=0.20$. Well below Curie temperature ${T}_{C}$, $\ensuremath{\rho}$ exhibits ${T}^{2}$ behavior whereas over a interval just it shows ${T}^{4}$ dependence due...

We report on the phase coexistence and magnetic anisotropy in polycrystalline (bulk) nanocrystalline (∼15 nm) LaMnO3+δ materials, which were prepared by solid state reaction sol-gel methods, respectively. In addition to standard magnetization measurements, radio-frequency transverse susceptibility (TS) based a very sensitive, self-resonant tunnel diode oscillator method was used probe switching fields samples. The results revealed of ferromagnetic (FM) antiferromagnetic (AFM) phases both For...

We report the first observation of inverse magnetocaloric effect (IMCE) in hydrothermally synthesized single crystalline La0.5Sr0.5MnO3 nanowires. The core nanowires is phase separated with development double exchange driven ferromagnetism (FM) antiferromagnetic (AFM) matrix, whereas surface found to be composed disordered magnetic spins. FM scales effective anisotropy, which directly probed by transverse susceptibility experiments. exhibits a glassy behavior and undergoes spin freezing,...

We report a high-response optical detector based on n-ZnO/p-Si nanowires (NWs) core–shell arrays decorated with plasmonic Au nanoparticles (NPs) that works in the broad frequency range from UV (300 nm) to NIR (1100 and consumes low power (few μW). The combines visible detectability of Si NWs detectivity ZnO through structure broadband has been achieved by decorating ligand-free NPs synthesized using pulsed laser ablation liquid. photodetector uses n-ZnO as active photoconductive channel is...

We have investigated the Jahn-Teller transition in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ by high-temperature powder neutron diffraction low-doping region $(0<x<~0.1).$ The temperature which is about ${T}_{\mathrm{JT}}\ensuremath{\approx}750\mathrm{K}$ for stoichiometric ${\mathrm{LaMnO}}_{3}$ drastically reduced on doping with Sr, becoming ${T}_{\mathrm{JT}}\ensuremath{\approx}475\mathrm{K}$ $x=0.10.$ previously identified metrically cubic orthorhombic O...