Facile room temperature deposition of gold nanoparticle-ionic liquid hybrid film on silica substrate

• A facile strategy for Au NP-IL hybrid thin film deposition on silica substrate is presented.
• IL and Au precursor concentrations influenced the morphology of Au NPs.
• The thickness of Au NP-IL film is 8–10 nm.

This work presents facile synthesis of gold nanoparticle (Au NP)-ionic liquid hybrid film of < 10 nm by a simple two-step process at room temperature by deposition of Au NPs suspended in 1-hexyl-1methyl-pyrolidinium bromide, on Si (111) substrates. FTIR results demonstrated that ionic liquid properties remain unaltered during and after Au NP synthesis, and even coating on Si (111) substrate. XRD, XPS, and XAS spectral data confirm the presence of Au(0) while EXAFS data indicated the presence of small particles or incomplete surface species. Cross-sectional analysis using FE-SEM and edge length measurement using AFM showed that the film thickness is ca 10 nm.

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