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Molecular layers

Organosilane reagents have attracted significant attention in recent years due to the production of functionalized thin films on silicon oxide and other oxide substrates that can be used for a variety of technological applications. For example, amino- silanes may serve as the foundation layer for the fabrication of various biosensor and bioarrays.

We are working on the in-situ method to precisely control the growth of molecular layers during molecular layer deposition (MLD), which can provide exquisite control of the film thickness and electronic properties of the layers. In order to do that, we use interdigitated capacitive electrodes on glass substrates, which allow a direct determination of the resistance, capacitance, and loss tangent of the growing organic layers (see Fig.). This brings possibility to measure properties of different kinds of organic layers for various approaches.

Molecular Layers Deposition In-situ activation via ozone and subsequent deposition of molecules.

For instance we can observe deposition of mixed monolayers onto the surface with ability to control proportion of deposited molecules or even perform the deposition of multilayer molecular structure as a basement for the organic components such as cells, proteins and etc.  In order to achieve the best morphology and surface concentration of the organic monolayers these applications we perform deposition via the vapor phase coating. Moreover we introduce a novel method of the in-situ cleaning and activation of the surface directly before the deposition via the ozone using a specially reworked microwave oven.

This method brings a high range of possible applications with respect to the combining of silicon based electronics and biological objects with further possibility not only to study properties of the latter but to influence on them.

Functional Oxides SAWApplication of strained ferroelectric films, example SAW.

 

Additionally we try to combine the molecular layers with other systems like function oxide layers. This way additional functionalities can be achieve in these complex systems. One example is sketched in the 3rd  figure where surface acoustic waves are generated in the organic layers. In combination with organic layers this might lead to novel sensor and actuator concepts for organic materials.

Additional Information

Contact:

Prof. Dr. Roger Wördenweber

Tel.:  +49-2461-61-2365
e-mail: r.woerdenweber@fz-juelich.de

More Information

Projects:

  • - In-situ Monitoring of SAMs Deposition
  • - Multilayer and Mixed Layers
  • - Combining Functional Oxides and Molecular Layers
  • - Surface Potential Analysis of Molecular Layers

Publications:

In Situ Analysis of the Growth and Dielectric Properties of Organic Self-Assembled Monolayers: A Way To Tailor Organic Layers for Electronic Applications, A. Markov et al, ACS Appl. Mater. Interfaces, 2016, 8, 16451, DOI:10.1021/acsami.6b04021

 

Immobilization and Surface Functionalization of Gold Nanoparticles Monitored via Streaming Current/Potential Measurements; K. Greben et al,  J.Phys.Chem. B 2015, 119, 5988,  DOI: 10.1021/acs.jpcb.5b02615


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