Sodium oleyl sulfate

• CAS: 1847-55-8
• Catalog Number: ALC-FP-1847558
• Category: Featured Products
• Molecular Weight: 370.52 g/mol
• Molecular Formula: C18H35NaO4S
• Appearance: Liquid to solid
• Sample Lot No.: A24C701P

Case Study

Optimizing 2D ZnO Synthesis with Sodium Oleyl Sulfate Surfactant Control

Huang, Chunfeng, et al. Crystals 13.1 (2022): 5.

Synthesizing well-defined 2D ZnO nanosheets requires precise control over the initial nucleation process to prevent excessive nucleation sites, which lead to small, multi-layered structures rather than large, uniform nanosheets needed for advanced electronics and optoelectronics.
This study investigated the critical role of sodium oleyl sulfate surfactant in controlling the nucleation and growth mechanism for synthesizing large, two-dimensional zinc oxide (ZnO) nanosheets via surfactant-assisted ion-layer epitaxy (SA-ILE). Sodium oleyl sulfate was employed to manage nucleation at the water-air interface. Its molecules electrostatically attract Zn²⁺ ions, restricting the location and number of initial nucleation sites.
Synthesis and Optimization
· Typical synthesis procedure: A precursor mixture of Zn(NO3)2·6H2O and HMT in a 1:1 ratio was dissolved in 17 mL of deionized water at a concentration of 50 mM. After 20 minutes, sodium oleyl sulfate surfactant, dissolved in 30 μL of chloroform (0.1 vol%), was introduced at the water-air interface. The solution was then heated to 70 °C for 50 minutes, resulting in the formation and growth of 2D ZnO at that interface.
· Growth was optimized by controlling sodium oleyl sulfate concentration (maintaining a 10 × 10^-5 ratio to Zn²⁺), temperature (70°C, affecting ion diffusion), precursor concentration (50 mM Zn(NO3)2·6H2O & hexamethylenetetramine (HMT), governing growth rate), and growth time (50 min, balancing growth processes). This yielded 2D ZnO nanosheets up to 20 micrometers in size, confirmed by SEM, EDS, XPS, and Raman characterization.

Enabling Wafer-Scale Ultrathin CoO Nanosheet Synthesis via Sodium Oleyl Sulfate Templating

Wang, Fei, et al. Journal of Materials Chemistry A 5.19 (2017): 9060-9066.

This case study examined the critical role of sodium oleyl sulfate in achieving wafer-scale synthesis of ultrathin cobalt oxide (CoO) nanosheets through ionic layer epitaxy (ILE), addressing the challenge of large-area 2D nanomaterial production from non-layered crystals.
Sodium Oleyl Sulfate Interface Templating
Sodium oleyl sulfate was utilized as an ionized surfactant monolayer at the water-air interface, serving as a flexible template for direct CoO crystallization. This interfacial layer enabled controlled bottom-up growth of free-standing nanosheets across the entire solution surface. This process yielded centimeter-scale polycrystalline CoO nanosheets with uniform 2.8 nm thickness across entire sheets.
Synthesis Details of CoO Nanosheets
An aqueous solution containing 2 mM cobalt(II) nitrate hexahydrate and 2 mM hexamethylenetetramine (HMT) was carefully poured into a glass reaction vial, ensuring minimal contact with the vial wall above the water-air interface. A precisely calculated volume of sodium oleyl sulfate in chloroform was applied to this interface, scaled according to the vial's opening area. Specifically, 8 μL of surfactant solution (2 mg sodium oleyl sulfate per 10 mL chloroform) was used for a vial with 4.5 cm² opening area. After 5 minutes of interfacial stabilization, the vial was sealed and heated at 60°C in a convection oven. Reaction duration varied between 2 and 6 hours to achieve the desired nanosheet thickness.