A seedless growth of zinc oxide (ZnO) structures on multilayer (ML) graphene by electrochemical deposition without any pre-deposited ZnO seed layer or metal catalyst was studied. A high density of a mixture of vertically aligned/non-aligned ZnO rods and flower-shaped structures was obtained. ML graphene seems to generate the formation of flower-shaped structures due to the stacking boundaries. The nucleation of ZnO seems to be promoted at the stacking edges of ML graphene with the increase of applied current density, resulting in the formation of flower-shaped structures. The diameters of the rods/flower-shaped structures also increase with the applied current density. ZnO rods/flower-shaped structures with high aspect ratio over 5.0 and good crystallinity were obtained at the applied current densities of -0.5 and -1.0 mA/cm(2). The growth mechanism was proposed. The growth involves the formation of ZnO nucleation below 80°C and the enhancement of the growth of vertically non-aligned rods and flower-shaped structures at 80°C. Such ZnO/graphene hybrid structure provides several potential applications in sensing devices.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4094539 | PMC |
| http://dx.doi.org/10.1186/1556-276X-9-337 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Controlled Heterovalent Vanadium Ion Coordinated Flower-Shaped Supramolecules Cathode for Zinc-Ion Storage.
ACS Appl Mater Interfaces
January 2025
School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China.
Vanadium-based materials, which offer multiple oxidation states and rich redox reactions in zinc-ion batteries (ZIBs), have gained substantial attention. However, achieving green and efficient preparation of vanadium oxides-based materials featured with a controlled content of different heterovalent vanadium remains a significant challenge. Herein, a vanadium-supramolecular flower-shaped material (VSF) with heterovalent vanadium was prepared using NHVO as vanadium metal center and hexamethylenetetramine as organic ligand in aqueous solution.
View Article and Find Full Text PDFA high-performance ultra-compact plasmonic metamaterial structure for optical THz absorption.
Sci Rep
November 2024
Electrical and Computer Engineering, King Abdulaziz University, Jeddah, Saudi Arabia.
This study presents the design and analysis of a high-performance metamaterial absorber for the optical terahertz (THz) regime. The proposed absorber utilizes a unique nested flower-shaped structure composed of nickel (Ni) and silicon dioxide (SiO), achieving an average absorption exceeding 97.91% with a broad bandwidth of 1320 THz (180 THz - 1500 THz).
View Article and Find Full Text PDFIr Doping Modulates the Electronic Structure of Flower-Shaped Phosphides for Water Oxidation.
Inorg Chem
November 2024
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Renai Road, Suzhou 215123, China.
Article Synopsis
- Electrolysis of water is a clean and efficient method to produce hydrogen, but its effectiveness is limited by the slow oxygen evolution reaction (OER).
- The study focuses on creating efficient and low-cost OER catalysts, specifically an Ir-doped CoP/FeP catalyst grown on nickel foam, which enhances catalytic activity.
- The optimized catalyst shows impressive performance with a low overpotential and minimal voltage requirement for overall water splitting, maintaining functionality for over 70 hours.
Biomimetic Multi-Interface Design of Raspberry-like Absorbent: Gd-doped FeNi@Covalent Organic Framework Derivatives for Efficient Electromagnetic Attenuation.
Small Methods
October 2024
Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Academy for Engineering & Technology, Fudan University, Shanghai, 200438, P. R. China.
Structural design and interface regulation are useful strategies for achieving strong electromagnetic wave absorption (EMWA) and broad effective absorption bandwidth (EAB). Herein, a monomer-mediated strategy is employed to control the growth of covalent organic framework (COF) wrapping flower-shaped Gd-doped FeNi (GFN), and a novel raspberry-like absorbent based on biomimetic design is fabricated by thermal catalysis. Further, a unique dielectric-magnetic synergistic system is constructed by utilizing the COF-derived nitrogen-doped porous carbon (NPC) as the shell and anisotropic GFN as the core.
View Article and Find Full Text PDFA circularly polarized graphene based wideband 1 × 2 array antenna for terahertz spectrum applications.
Heliyon
September 2024
Signal, System and Component Laboratory, Sidi Mohamed Ben Abdellah University - FST, Fez, 30000, Morocco.
A graphene-based 1 × 2 array antenna with circular polarization for terahertz applications is prescribed in this article. Initially, a novel concept of a folded quarter wave impedance transformer is utilized in the design process of a single element for minimizing the overall antenna size. The opposite corners of the patches have been truncated and structural modifications are performed with the insertion of four flower-shaped slots along with an additional circular slot for achieving a much-improved reflection coefficient and better impedance bandwidth.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!