X-RAY Surface Radiolysis : Formation Of Metal-Organic Interface

<p>Michel Goldmann</p>

X-RAY Surface Radiolysis : Formation Of Metal-Organic Interface

Michel Goldmann

Institut des NanoSciences de Paris, France

: J Nanomater Mol Nanotechnol

Abstract

We are developing an original method to obtain nano-objects with adjustable functionalization. We use the selfassembling properties of amphiphilic organic molecules in solution to obtain a nanometric structure. They are functionalized either by choosing an adapted architecture of the molecule, either by using the nano-structure as a template which is coated, i.e. by radiolysis, by a nanometric layer of a chosen element. This versatile procedure appears then to have a strong potentiality for producing various systems. The two procedures can be eventually coupled to enlarge the properties of the obtained nano-object. We present results obtained in a 2D geometry. Irradiating with an x-ray beam at grazing incidence a Langmuir monolayer of behenic acid deposited onto a silver solution, we obtain in a first step a thin silver layer anchored below the organic film. We followed the formation and structure of this metal layer by diffuse scattering, GIXD and surface x-ray fluorescence. The metal/organic films have been transferred onto solid substrate for complementary experiment. XPS measurements confirm unambiguously the presence of silver metallic atoms as AFM evidence a thickness of 4.5 nm for the metallic layer (figure), in agreement with the penetration of the x-ray evanescent wave. In a second step, the growth of silver NPs is observed.Results obtained on copolymer monolayers leading to the formation of NPs and in a 3D geometry, micelles in solution leading to the formation of silver nano-shells will be also presented