Cobalt Oxide Nanowires
Overview
Cobalt(II) oxide nanowires (CoO nanowires) are one-dimensional nanostructures with diameters typically ranging from 10 to 100 nanometers and lengths up to several micrometers. Their high aspect ratio and surface area make them ideal for applications requiring enhanced reactivity or conductivity. CoO nanowires exhibit unique magnetic properties due to cobalt's electronic configuration, which is leveraged in advanced materials science. These nanowires are synthesized via methods like hydrothermal growth, chemical vapor deposition (CVD), or electrospinning, with strict control over morphology and crystallinity. Their stability under moderate temperatures and tunable properties have positioned them as critical components in energy storage and nanotechnology.
Physical and Chemical Properties
CoO nanowires crystallize in a cubic rock salt structure, with antiferromagnetic behavior below 291 K. Their electrical conductivity is semiconducting, and they demonstrate p-type behavior due to cobalt vacancies. The nanowires' high surface-to-volume ratio enhances their catalytic activity, particularly in oxidation reactions. Thermal stability is notable, with decomposition occurring only above 1,800°C. However, they are sensitive to oxidation in air, gradually converting to Co3O4. Solubility is limited to acidic environments, where they dissolve to form Co²⁺ ions. Density and mechanical strength align with bulk CoO, but flexibility varies with synthesis parameters.
Main Applications
In lithium-ion batteries, CoO nanowires serve as high-capacity anodes due to their ability to alloy with lithium, offering theoretical capacities of ~715 mAh/g. Their porous structure accommodates volume changes during cycling, improving longevity. Gas sensors utilize CoO nanowires for detecting reducing gases like CO and H2, where surface reactions alter electrical resistance. Catalytic applications include water splitting and Fischer-Tropsch synthesis, leveraging their oxygen vacancy sites. Additionally, their magnetic properties are exploited in data storage devices and spintronics.
Safety and Storage
CoO nanowires are classified as hazardous upon inhalation (P261/P284 PPE recommendations) and may cause skin irritation. Dust exposure should be minimized using fume hoods or enclosed handling systems. Powdered forms pose explosion risks; avoid sparks or static discharge. Storage requires airtight containers under argon or nitrogen to prevent oxidation. Humidity must be controlled (<30% RH), and containers should be labeled with GHS pictograms for metal toxicity. Spills require HEPA filtration and neutralization with dilute acid.
B2B Procurement Guide
Key procurement criteria include purity (≥99%), nanowire diameter (specify ±10 nm tolerance), and length distribution (e.g., 1–10 μm). Suppliers should provide XRD and SEM characterization data. Batch consistency is critical for industrial applications like battery manufacturing. Pricing depends on order volume, with bulk purchases (1 kg+) often discounted by 15–30%. Lead times vary from 2–6 weeks for custom syntheses. Reputable suppliers include Nanografi, US Research Nanomaterials, and SkySpring Nanomaterials, which offer COA and MSDS documentation.
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