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À propos de : Diffusion of Alkanethiols in PDMS and Its Implications onMicrocontact Printing (μCP)        

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  • Diffusion of Alkanethiols in PDMS and Its Implications onMicrocontact Printing (μCP)
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  • n-Alkanethiols HS−(CH2)n−CH3 such as hexadecanethiol (HDT, n = 15), octadecanethiol (ODT, n = 17),and eicosanethiol (ECT, n = 19) have been shown to provide highly protective etch resists on microcontact-printed noble metals. As the quality of the printed pattern strongly depends on the mobility of the inkcompound, we focused on understanding the diffusion behavior of HDT, ODT, and ECT in poly(dimethylsiloxane) (PDMS) stamps. We used a commercial PDMS material (Sylgard184), which is commonlyused for microcontact printing (μCP), and a custom-synthesized one with a higher modulus. On the basisof linear-diffusion experiments, which maintained realistic printing conditions, we showed that the inktransport in the stamp follows Fick's law of diffusion. We then determined the diffusion coefficient byanalytical and numerical modeling of the diffusion experiments. Numerical calculations were carried outwith the finite-difference method applying more realistic boundary conditions (ink adsorption). Values forthe diffusion coefficients of the three ink compounds in the two different PDMS materials all are on theorder of (4−7) × 10-7 cm2 s-1. The scope and limits of the mathematical models are discussed. To demonstratethe potential of such models for microcontact printing, we simulate multiple printing cycles of an inkedstamp and compare the results with experimental data.
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