Electron induced cross-linking

Controlling the properties of functional layers in direct contact to semiconductor surfaces is of major importance for future applications in nanoelectronics, photovoltaics and sensing. Recently, it has been demonstrated that, starting from a library of self-assembled monolayer molecules (SAMs), it is possible to tailor the properties of carbon nanomembranes, for example, to produce ultrathin films. These membranes are synthesized by irradiation-induced cross-linking of aromatic thiols on gold.



 

AFM image after cross-linking and successive etching of aromatic self-assembled monolayers on Si/SiO2

Following this approach, we are interested in tuning the properties at the nanoscale of aromatic organophosphonate SAMs directly grown on semiconductor, like silicon dioxide and silicon carbide. We are working with self-assembled monolayers of complex aromatic phosphonic acids containing at the distal ends different functional groups (nitro, carboxylic, phosphonic acid), potentially ready to further modification. The electron-induced cross-linking of the aromatic SAMs can be achieved by irradiating the samples with an electron source at around 10-8 mbar and with variation of the dose. The novel functional interfaces generated are characterized by a variety of surface analysis methods, including optical microscopy, atomic force microscopy (AFM), contact angle (CA), X-ray photoelectron spectroscopy (XPS) as well as electrochemical measurements (impedance spectroscopy and cyclic voltammetry). Current investigations are focusing on the optimization of the cross-linking process and on the investigation of the chemical mechanism which cause the covalent interactions on the surface.

Collaborations:

Jeffrey Schwartz, Chemistry Department, Princeton University New Jersey, USA

Andrey Turchanin, Institute of Physical Chemistry, Friedrich Schiller University Jena, Germany

Open Positions:

if you would like to join us as an internship or master student on this project, please contact Reka Csiki.

 

 



 

 

 

TUM Technische Universität München TUM Technische Universität München Physik Department Elektrotechnik und Informationstechnik TUM Technische Universität München
 

Events & News

17 Jan 2018

ERC Consolidator Grant for Gregor Koblmüller   more

16 Jan 2018

Light-steering of spin-polarized currents in topological insulators   more

10 Aug 2017

Best Poster Awards for Ganpath Veerabathran and Alexander Andrejew at iNOW 2017   more

27 Jun 2017

Best Poster Award at Nanowire Week for Jochen Bissinger   more

15 Mar 2017

Dr. Kai Müller admitted to the “Junges Kolleg” of the Bavarian Academy of Sciences   more

Seminars

March 12, 2018

Two-dimensional coherent spectroscopy of a semiconductor microcavity   more

March 05, 2018

Diamond-organic photovoltaics   more