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Three Dimensional Structures of NiO Nanoporous/ZnO Nanoarray Film for Enhanced Electrochromic Performance
摘要： An electrochromic device using the as-obtained NiO nanoporous/ZnO nanoarray working electrode was constructed and assembled. NiO nanoporous/ZnO nanoarray three dimensional structures was prepared on ITO glass substrate by a two-step route which combined chemical bath deposition method with hydrothermal method. NiO nanoporous/ZnO nanoarray electrode reveals noticeable improvement of electrochromism compared to unitary NiO nanoporous, including larger optical modulation (81%), higher coloration efficiency (78.5 cm2/C), faster response times (2.6 s and 9.7 s for coloring and bleaching), and favourable durability performance. Such enhancement is mainly attributed to the three dimensional structures of NiO nanoporous coated on ZnO nanoarray. Namely, (1) uniform hexagonal ZnO nanoarray loaded more amount of NiO nanoporous, (2) NiO nanoporous cross-linked with ZnO nanorods provided a loose interspace morphology, (3) stronger adhesion between ZnO nanorods and ITO rested with ZnO seed, (4) core-shell and cross-linked structures promoted electrolyte infiltration, and (5) appropriate bandgap improved the charges transfer.
关键词： NiO nanoporous,ZnO nanorod array,electrochromic,three dimensional
更新于2025-09-23 15:23:52
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Length-Dependent Electronic Transport Properties of the ZnO Nanorod
摘要： The two-probe device of nanorod-coupled gold electrodes is constructed based on the triangular zinc oxide (ZnO) nanorod. The length-dependent electronic transport properties of the ZnO nanorod was studied by density functional theory (DFT) with the non-equilibrium Green’s function (NEGF). Our results show that the current of devices decreases with increasing length of the ZnO nanorod at the same bias voltage. Metal-like behavior for the short nanorod was observed under small bias voltage due to the interface state between gold and the ZnO nanorod. However, the influence of the interface on the device was negligible under the condition that the length of the ZnO nanorod increases. Moreover, the rectification behavior was observed for the longer ZnO nanorod, which was analyzed from the transmission spectra and molecular-projected self-consistent Hamiltonian (MPSH) states. Our results indicate that the ZnO nanorod would have potential applications in electronic-integrated devices.
关键词： current–voltage (I–V) curves,molecular-projected self-consistent Hamiltonian (MPSH),transport properties,zinc oxide (ZnO) nanorod,transmission spectrum
更新于2025-09-23 15:23:52
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Performance enhancement of ZnO nanorod-based enzymatic glucose sensor via reduced graphene oxide deposition and UV irradiation
摘要： This paper reports the performance enhancement of a ZnO nanorod-based enzymatic glucose sensor with reduced graphene oxide (rGO) introduced between the ZnO nanorods and indium tin oxide (ITO) electrode and then stimulated under UV irradiation. The electrochemical characterization indicates that the rGO not only facilitates electron transfer through the ZnO nanorods to the ITO electrode but also inhibits the fast recombination of the photo-generated electrons and holes. The UV irradiation stimulates holes in the valence band of the ZnO nanorods, which as oxidants enhance the catalytic activity of the glucose oxidase (GOx) towards glucose. The rGO increases the sensitivity of the ZnO nanorod-based glucose sensor by 1.6 times and decreases the detection limit by 2.3 times. Together with the rGO, the UV irradiation further increases the sensitivity by 1.7 times and diminishes the detection limit by 2 times. Moreover, the as-prepared glucose sensors exhibit excellent selectivity to urea, uric acid, and ascorbic acid, and can reliably determine the glucose concentration in a serum sample. The results have the potential to improve the performance of other enzymatic biosensors.
关键词： Glucose sensor,ZnO nanorod,UV irradiation,Graphene,Electrochemical test
更新于2025-09-23 15:23:52
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Surface Modification on Nanoripple-like ZnO Nanorod Arrays Using Two-dimensional (2D) Bi2OS2 to Fabricate High-Performance Inverted Polymer Solar Cells
摘要： In this paper, three-dimensional (3D) nanoripple-like ZnO nanorod arrays (R-ZnO NRAs) are successfully fabricated and modified by two-dimensional (2D) Bi2OS2 material, and inverted polymer solar cells (IPSCs) with R-ZnO modified by Bi2OS2 as electron transmission layer (ETL) are fabricated for the first time. The results show that the surface morphologies of R-ZnO NRAs can be controlled by adjusting the concentration of the modified 2D Bi2OS2 solution. Bi2OS2 modification can not only suppress the surface defects of R-ZnO NRAs, reduce the recombination of photogenerated charges, but also increase crystallinity of the active layer, resulting in effective electron collection. And thus, the performance of IPSCs is obviously improved. The power conversion efficiency (PCE) of PTB7: PCBM based PSCs with R-ZnO NRAs modified by 2% Bi2O2S as ETL is considerably raised to 7.31% from 5.51%. More interestingly, Bi2OS2 modification enhances IPSCs stability to remain 80.9% of their initial PCE after 80 days, yet IPSCs with pristine R-ZnO NRAs remain only 47.4% of their initial PCE. Moreover, this approach can also successfully improve the performance of another IPSC composed of PBDB-T: ITIC blends. The PCE of the device based on 2% Bi2OS2-modified R-ZnO NRAs is improved to 9.94% from 8.03% of the reference device without Bi2OS2 modification. This work not only provides an effective mean of surface modification of R-ZnO NRAs, but also shows the Bi2OS2 material has potential application in PSCs.
关键词： Recombination,Bi2OS2 nanosheets,Inverted polymer solar cells,Nanoripple-like ZnO nanorod arrays
更新于2025-09-23 15:21:01
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Self-Aligned Hierarchical ZnO Nanorod/NiO Nanosheet Arrays for High Photon Extraction Efficiency of GaN-Based Photonic Emitter
摘要： Advancements in nanotechnology have facilitated the increased use of ZnO nanostructures. In particular, hierarchical and core–shell nanostructures, providing a graded refractive index change, have recently been applied to enhance the photon extraction e?ciency of photonic emitters. In this study, we demonstrate self-aligned hierarchical ZnO nanorod (ZNR)/NiO nanosheet arrays on a conventional photonic emitter (C-emitter) with a wavelength of 430 nm. These hierarchical nanostructures were synthesized through a two-step hydrothermal process at low temperature, and their optical output power was approximately 17% higher than that of ZNR arrays on a C-emitter and two times higher than that of a C-emitter. These results are due to the graded index change in refractive index from the GaN layer inside the device toward the outside as well as decreases in the total internal re?ection and Fresnel re?ection of the photonic emitter.
关键词： ZnO nanorod/NiO nanosheet,photon extraction e?ciency,photonic emitter,self-align,hierarchical nanostructures
更新于2025-09-23 15:19:57
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A solid-state integrated photo-supercapacitor based on ZnO nanorod arrays decorated with Ag <sub/>2</sub> S quantum dots as the photoanode and a PEDOT charge storage counter-electrode
摘要： A planar solid-state photocapacitor with two electrodes has been prepared for the first time using a passivated film of ZnS with Ag2S quantum dots deposited on ZnO nanorods, which were electrochemically grown on ZnO seed layers, as the photoanode. The supercapacitor part is composed of a electrodeposited poly(3,4-ethylene-dioxythiophene) PEDOT film as the counter-electrode and an ionic liquid-based electrolyte between them deposited by the dip coating method. The different nanostructures and electrodes were morphologically and structurally characterized, and the device was electrochemically characterized and could reach a potential of 0.33 V during photocharge and a storage efficiency of 6.83%.
关键词： solid-state,ZnO nanorod arrays,electrochemical characterization,PEDOT,photo-supercapacitor,Ag2S quantum dots
更新于2025-09-19 17:13:59
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Improved near-UV electroluminescence of ZnO nanorod array LEDs by coupling with a graphene plasmon layer
摘要： The development of short-wavelength light-emitting diodes (LEDs) with high emission efficiency, a fascinating research area, is still necessary because of great scientific interest and practical significance. Here, a graphene plasmon layer treated by oxygen plasma was employed into ZnO nanorod/p-GaN LEDs for a surface plasmon effect. The graphene-decorated heterojunction exhibited an approximately 4-fold improvement of ZnO ultraviolet (UV) electroluminescence (EL) intensity relative to a primitive p-n junction device. Time-resolved spectroscopy and temperature-dependent luminescence measurement indicated that the EL enhancement resulted from the coupling of ZnO excitons with graphene surface plasmons. The current research not only provides an opportunity to construct three-dimensional architecture from a vertical array of one-dimensional nanorods and a two-dimensional graphene layer, but also proposes an effective strategy to improve near-UV emission efficiency in various devices.
关键词： ZnO nanorod,ultraviolet LED,graphene surface plasmon,p-n heterojunction
更新于2025-09-16 10:30:52
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Enhanced Visible Light Photodegradation of Microplastic Fragments with Plasmonic Platinum/Zinc Oxide Nanorod Photocatalysts
摘要： Microplastics are persistent anthropogenic pollutants which have become a global concern owing to their widespread existence and unfamiliar threats to the environment and living organisms. This study demonstrates the degradation of fragmented microplastics particularly low-density polyethylene (LDPE) film in water, through visible light-induced plasmonic photocatalysts comprising of platinum nanoparticles deposited on zinc oxide (ZnO) nanorods (ZnO-Pt). The ZnO-Pt nanocomposite photocatalysts were observed to have better degradation kinetics for a model organic dye (methylene blue) compared to bare ZnO nanorods, attributed to the plasmonic effects leading to better interfacial exciton separation and improved hydroxyl radical activity along with a 78% increase in visible light absorption. These demonstrations of the plasmonically enhanced photocatalyst enabled it to effectively degrade microplastic fragments as confirmed following the changes in carbonyl and vinyl indices in infrared absorption. In addition, visual proof of physical surface damage of the LDPE film establishes the efficacy of using plasmonically enhanced nanocomposite photocatalytic materials to tackle the microplastic menace using just sunlight for a clean and green approach towards mitigation of microplastics in the ecosystem.
关键词： microplastics,platinum nanoparticle,ZnO nanorod,LDPE film,visible light photodegradation,nanocomposite
更新于2025-09-16 10:30:52
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Photovoltaic performance improvement via designing nanorod parameter in composite-structure solar cells
摘要： In this work, the optical characteristics of electrodeposited Cu2O films was studied, and the depth of photogenerated carriers in Cu2O films was obtained. In order to improve the collection depth of the photogenerated carrier in ZnO/Cu2O solar cells, ZnO nanorod array were employed to construct composite-structure solar cells. The influence of the ZnO nanorod arrays on short-circuit current and open circuit voltage was systematically analyzed in the nanorod cells. For optimizing device performance, ordered ZnO nanorod arrays that incorporated design spacing that matched the carrier diffusion length of the absorption layer were used. Analyses of the photovoltaic properties revealed that ordered nanorod arrays with a proper spacing could improve carrier generation efficiency in high-efficient collection regions of the carriers. These observations indicate that nanorod spacing is an important variable in the construction of high-efficient nanorod-based solar cells.
关键词： Radial heterojunction,Carrier collection length,Optical absorption depth,Ordered ZnO nanorod array
更新于2025-09-12 10:27:22
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Particulate Oxynitride Photoanodes Assembled with Transparent Electron-Collecting Oxide Nanorod Arrays
摘要： The collection of photogenerated electrons is commonly a bottleneck in photoelectrochemical water oxidation on a particulate photoanode. Herein, a new strategy called “array insertion” for particulate photoanode preparation is proposed to improve electron collection. ZnO nanorod arrays are inserted between LaTiO2N particles and Al-doped ZnO (AZO) substrates via epitaxial electrodeposition, which make electronic connections. Using this methodology, charge separation efficiency is improved drastically, and the photocurrent at 1.23 VRHE is enhanced by more than 1 order of magnitude, because the obstacle of electron collection in the particulate LaTiO2N photoanodes is overcome.
关键词： photoelectrochemical water oxidation,particulate photoanode,ZnO nanorod arrays,LaTiO2N,electron collection
更新于2025-09-11 14:15:04