Studies on structural,spectral and morphological properties of co-precipitation derived Co-doped ZnO nanocapsules for NO2 sensing applications

Journal of Materials Science: Materials in Electronics - Pristine and Co-doped ZnO (CZ) nanocapsules (NCs) have been successfully prepared using a simple and cost-effective co-precipitation method....     

Study on the electronic band structure of ZnO–SnO2 heterostructured nanocomposites with mechanistic investigation on the enhanced photoluminescence and photocatalytic properties

Journal of Materials Science: Materials in Electronics - Sol–gel method of synthesizing nanocomposites (NCs) of two metal oxides (ZnO & SnO2) was implemented along with the pristine...     

An Optically Flat Conductive Outcoupler Using Core/Shell Ag/ZnO Nanochurros

Transparent conductive electrodes (TCEs) featuring a smooth surface are indispensable for preserving pristine electrical characteristics in optoelectronic and transparent electronic devices. For high‐efficiency organic light emitting diodes (OLEDs), a high outcoupling efficiency, which is crucial, is only achieved by incorporating a wavelength‐scale undulating surface into a TCE layer, but this inevitably degrades device performance. Here, an optically flat, high‐conductivity TCE composed of core/shell Ag/ZnO nanochurros (NCs) is reported embedded within a resin film on a polyethylene terephthalate substrate, simultaneously serving as an efficient outcoupler and a flexible substrate. The ZnO NCs are epitaxially grown on the {100} planes of a pentagonal Ag core and the length of ZnO shells is precisely controlled by the exposure time of Xe lamp. Unlike Ag nanowires films, the Ag/ZnO NCs films markedly boost the optical tunneling of light. Green‐emitting OLEDs (2.78 × 3.5 mm²) fabricated with the Ag/ZnO TCE exhibit an 86% higher power efficiency at 1000 cd m^?2 than ones with an Sn‐doped indium oxide TCE. A full‐vectorial electromagnetic simulation suggests the suppression of plasmonic absorption losses within their Ag cores. These results provide a feasibility of multifunctional TCEs with synthetically controlled core/shell nanomaterials toward the development of high‐efficiency LED and solar cell devices.     

Influence of atmosphere on photoluminescence properties of Eu-doped ZnO nanocrystals

We have fabricated Eu³⁺-doped ZnO (ZnO:Eu) nanocrystals (NCs) by a reverse micelle method, and have studied their photoluminescence (PL) properties in vacuum, nitrogen gas, and oxygen gas atmospheres. The ZnO:Eu NCs exhibit the exciton, defect and Eu³⁺ PL under the inter-band photoexcitation of the ZnO host NCs. The intensity ratio among the three PL peaks is sensitive to the atmosphere for the PL measurements. We discuss the influence of the surrounding gas atmosphere to the PL properties.     

Enhanced sensitivity and response speed of graphene oxide/ZnO nanorods photodetector fabricated by introducing graphene oxide in seed layer

Graphene/ZnO nanocomposites photodetectors hold great potential for UV detection because of the combination of photosensitive ZnO and high electron-mobility graphene. In this paper, graphene oxide (GO)/ZnO nanorods photoconductive photodetector with seed layer of GO and ZnO nanocrystals (NCs) hybrids is fabricated via a low-cost solution process. Uniform and oriented GO/ZnO nanorods have been obtained due to the positive role of GO in the growth process of ZnO nanorods, which gives rise to less light scattering and thereby stronger absorption and enhanced photocurrent. When the growth time is 1 h, the optimum photocurrent of GO/ZnO nanorods is about 9.4 times than pure ZnO nanorods, meanwhile, the corresponding detectivity reaches 7.17?×?10¹¹ cm Hz^1/2 W^?1. In addition, owing to the high carrier mobility of graphene, the response time t ₉₀ of GO/ZnO photodetector beneficially decreases to ~1 s, which is much faster than many other GO/ZnO hybrid photodetectors.     

Fabrication of ZnO/ZnS/ZnSe nanosheets for enhanced photocatalytic activity under simulated solar light

Journal of Materials Science: Materials in Electronics - Ternary composite ZnO/ZnS/ZnSe nanosheets (NSs) with diverse proportions of three modules successfully manufactured by a plain two-step...     

Efficient green photocatalyst of Ag/ZnO nanoparticles for methylene blue photodegradation

Journal of Materials Science: Materials in Electronics - Ag/ZnO nanoparticles photocatalysts with various Ag concentrations were synthesized through the hydrothermal treatment. The as-prepared...     

Ginkgo leaves extract-assisted synthesis of ZnO/CuO nanocrystals for efficient UV-induced photodegradation of organic dyes and antibacterial activity

Journal of Materials Science: Materials in Electronics - Biogenic nanocrystals (NCs) were synthesized from Ginkgo biloba leaf extract (GLE) and applied as photocatalytic and antibacterial...     

Hydrothermal synthesis of ZnO/C microflowers for photocatalytic degradation of organic pollutants under visible light irradiation: kinetics,mechanism and recyclability

Journal of Materials Science: Materials in Electronics - We developed an improved hexagonal wurtzite ZnO and ZnO/C microflowers through the facile hydrothermal technique. The obtained...     

Rapid thermal annealing of sputter-deposited ZnO/ZnO:N/ZnO multilayered structures

Rapid thermal annealing (RTA) of sputter-deposited ZnO/ZnO:N/ZnO multilayered structures formed by a combination of radio-frequency magnetron sputtering and a microwave plasma source was investigated for the fabrication of highly-crystallized ZnO:N films. The assistance of the microwave plasma source resulted in the enhancement of nitrogen incorporation into the ZnO films and the deterioration of film crystallization. On the other hand, crystallization of the ZnO:N layer was improved by RTA with no significant effusion and diffusion of N atoms using a ZnO/ZnO:N/ZnO multilayered structure. The role of the front and bottom ZnO layers during RTA of ZnO/ZnO:N/ZnO multilayered structures is demonstrated.     

Direct observation of enhanced cathodoluminescence emissions from ZnO nanocones compared with ZnO nanowire arrays

We report, for the first time, direct observation of enhanced cathodoluminescence (CL) emissions from ZnO nanocones (NCs) compared with ZnO nanowires (NWs). For direct and unambiguous comparison of CL emissions from NWs and nanocones, periodic arrays of ZnO NW were converted to nanocone arrays by our unique HCl [aq] etching technique, enabling us to compare the CL emissions from original NWs and final nanocones at the same location. CL measurements on NW and nanocone arrays reveal that emission intensity of the nanocone at ～ 387 nm is over two times larger than that of NW arrays. The enhancement of CL emission from nanocones has been confirmed by finite-difference time-domain simulation of enhanced light extraction from ZnO nanocones compared to ZnO NWs. The enhanced CL from nanocones is attributed to its sharp morphology, resulting in more chances of photons to be extracted at the interface between ZnO and air.     

Fabrication of magnetic ZnO/ZnFe2O4/diatomite composites: improved photocatalytic efficiency under visible light irradiation

Journal of Materials Science: Materials in Electronics - The magnetic recoverable ZnO/ZnFe2O4/diatomite (ZZFDT) composite was synthesized by hydrothermal-precipitation method. The structure,...     

Structural and optical characterisation of ZnO nanocrystals embedded in bulk KBr single crystal

The ZnO nanocrystals (NCs) embedded in KBr single crystal matrix has been fabricated using the Czochralski (Cz) method. X-ray diffraction has confirmed the embedding of ZnO nanocrystals inside the bulk KBr matrix. A blue shift of the absorption edge of the obtained samples has been observed. Moreover, ZnO nanocrystals embedded in bulk KBr single crystals, present photoluminescence (PL) bands, at 1.6 K, associated with free and bound excitons. These results confirm that bulk KBr single crystal is a suitable matrix-host for ZnO nanocrystals.     

Dependence of β-Co(OH)2/ZnO heterostructural composite prepared by one-pot hydrothermal method on visible-light-driven photocatalytic degradation of organic dye

Journal of Materials Science: Materials in Electronics - A β-Co(OH)2/ZnO heterostructural composite was successfully prepared via a simple one-pot hydrothermal method. The β-Co(OH)2/ZnO...     

Insights into the mechanism of ZnO/g–C3N4 nanocomposites toward photocatalytic degradation of multiple organic dyes

Journal of Materials Science: Materials in Electronics - Graphitic–carbon nitride (g–C3N4)-based zinc oxide (ZnO) nanocomposite (ZnO/g–C3N4) is synthesized via...     

The effect of ZnO particle size on the dynamic mechanical,thermal, and dielectric properties of ZnO varistor-Epoxy composites

Journal of Materials Science: Materials in Electronics - In this study, ZnO varistors with different particle sizes were added into the epoxy resin to fabricate ZnO varistor-Epoxy composites. The...     

Gas sensor based on rGO/ZnO aerogel for efficient detection of NO2 at room temperature

Journal of Materials Science: Materials in Electronics - In this paper, a simple, low cost and easy to operate hydrothermal method was successfully used to synthesize rGO/ZnO aerogel in one step....     

Understanding the charge transfer and defect states in ZnO/In2O3 composite nanostructures (CNs)

Journal of Materials Science: Materials in Electronics - This report presents the VLS synthesis and the study of the charge carrier transport through defect states across the interface in ZnO/In2O3...     

Novel NiO/ZnO/Fe2O3 white light-emitting phosphor: facile synthesis,color-tunable photoluminescence and robust photocatalytic activity

Journal of Materials Science: Materials in Electronics - The NiO/ZnO/Fe2O3 ternary nanocomposites with different molar ratios (1:1:1), (2:1:1), (3:1:1) and (4:1:1) were synthesized by...