Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 33, Pages 19228-19235Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b05547
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Funding
- ELETTRA
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On-surface polymerization realized at the solid liquid interface represents a promising route to obtain stable and conductive organic layers with tunable properties. We present here spectroicopic evidence of pt.-conjugated polymer formation at the interface between an iodine-modified Au(111) and an aqueous solution. Schiff-base coupling has been used to drive the reaction by changing the pH. Scanning tunneling microscopy (STM) investigations show that the substrate acts as a template driving the formation of ID ordered nanostructures. All the chemical states of the molecules on the surface have been identified and their evolution as a function of the pH has been monitored by synchrotron radiation X-ray photoelectron spectroscopy (XPS), demonstrating that two polymeric phases, undistinguishable by STM, exist on the surface: intermediate state and pi-conjugated final product. The I/Au(111) substrate enhances the formation of pi-conjugated polymers, as established comparing their production on the surface and in the bulk solution.
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