Silver‐Alkylamine Complex Mediated Single Micelle toward Synthesis of Sub‐8 nm Silver Nanocrystals

Abstract Small size and narrow distribution are the key factors to improve performances of metal nanocrystals due to nanosize effect. Here, a silver‐alkylamine complex–mediated single micelle, a one‐pot approach, for controlled synthesis of monodisperse silver nanocrystals, in which oleylamine molecules play key roles serving both as complex agent and as micellar coalescence blocker is reported. After the synthesis, monodisperse products can be directly collected through subsequent single‐step separation as the particle size is finely adjusted during the synthesis. Dual‐soluble silver oleylamine complex is prepared through liquid phase complexing and is used as oil‐soluble precursor in single reverse micelle. The as‐synthesized silver nanocrystals are very uniform with a controlled size of 6.00 ± 0.29 or 8.0 ± 0.40 nm and a narrow size distribution with a standard deviation (σ) of ≈5.0%. The protocol offers a general platform for fast synthesis of noble metal nanocrystals with rationally designed size and structure.