A novel approach to the synthesis of nanostructured metal-organic films: X-ray radiolysis of silver ions using a Langmuir monolayer as a template

TL;DR

This paper introduces a new X-ray radiolysis technique using a Langmuir monolayer to synthesize nanostructured silver-organic films with precise control over shape and thickness, monitored in real-time.

Contribution

It presents a novel method combining X-ray synchrotron radiation and Langmuir monolayers for controlled synthesis of metal-organic nanofilms, with in situ structural monitoring.

Findings

Successful synthesis of 4.6 nm thick silver-organic film

In situ X-ray scattering effectively monitors film formation

Film structure aligns with initial organic phase

Abstract

An application of the radiolysis method using X-ray synchrotron beam is developed as a novel approach to the synthesis of metal-organic films with controlled shapes and thickness. We demonstrate that a Langmuir monolayer deposited onto a silver ion-containing subphase, irradiated by an incident beam impinging below the critical angle for total reflection, induces the synthesis of a stable nanostructured silver-organic ultrathin film at the air-water interface. The X-ray scattering is also used to monitor in situ the structure of the silver layer during the synthesis process. The layer is observed by AFM after its transfer onto a silicon substrate. One observes a film thickness of 4.6 nm, in good agreement with the X-ray penetration depth, about 4.5 nm. The silver structure is oriented by the initial organic film phase. This experiment demonstrates the considerable potential of this approach to produce various controlled metal-organic films with a surfactant self-assembly as a template.