SALES - Information SERVICE - Information
Marcus Liemen - Business Development Accurion

Marcus Liemen

Business Development

Phone:

Mail: ml@accurion.com

Dr. Peter Thiesen - Senior Application Specialist Accurion

Dr. Peter Thiesen

Senior Application Specialist

Phone: +49-551-9996020

Mail: pt@accurion.com

Daniela Bogner - Sales Manager Accurion

Daniela Bogner

Sales Manager

Phone: +49-551-9996013

Mail: db@accurion.com

Linda Thieme - Sales Manager Accurion

Linda Thieme

Sales Manager

Phone: +49-551-9996016

Mail: lth@accurion.com

Sebastian Funke - Application Specialist, 2D Materials Accurion

Sebastian Funke

Application Specialist, 2D Materials

Phone: +49-551-999600

Mail: sfu@accurion.com

Dr. Christian Hoffmann - Application Specialist for Biological Applications Accurion

Dr. Christian Hoffmann

Application Specialist for Biological Applications

Phone: +49-551-9996021

Mail: cho@accurion.com

Stephan Ferneding - Chief Executive Officer Accurion

Stephan Ferneding

Chief Executive Officer

Phone: +49-551-999600

Mail:

Narayana Sharma - Sales and Application Accurion

Narayana Sharma

Sales and Application

Phone: +91-98450 04273

Mail: sharma@accurion.com

Frank Zuo - Sales and Application Accurion

Frank Zuo

Sales and Application

Phone: +86-21 5017 9099

Mail: fz@accurion.cn

Dr. Antonio Gonzalez - Service and LB-Application Specialist Accurion

Dr. Antonio Gonzalez

Service and LB-Application Specialist

Phone: +49-551-9996035

Mail: ago@accurion.com

Arash Mirhamed - Product Manager Accurion

Arash Mirhamed

Product Manager

Phone: +49-551-9996015

Mail: am@accurion.com

Holger Grube - Service Engineer Accurion

Holger Grube

Service Engineer

Phone: +49-551-9996023

Mail: service-halcyonics@accurion.com

SALES / SUPPORT
Logo

Layer by Layer Adsorption

Polyelectrolyte Adsorption, Layer by Layer Technique

Polyelectrolyte Adsorption Accurion

The layer-by layer (LbL) adsorption, introduced by G. Decher, is a versatile and inexpensive technique that can be used as a means for fabrication of nanostructured films. The consecutive deposition of layers of two polyelectrolytes, enable the stepwise increase of polyelectrolyte thickness and assemblies with fine control of spatial architecture. To form an LbL film, a substrate is first exposed to a charged polyelectrolyte solution to form the first layer. The treatment of surface with a solution of an oppositely charged polyelectrolyte solution leads to formation of a second layer. The process can then be repeated for film buildup.

 

Imaging ellipsometry was used for the following measurements:

  • Thickness of the different steps and of anchoring layers
  • (High sensitivity and accuracy because of four zone nulling and averaging of different regions of interest)
  • Time dependency of the adsorption

Thickness maps with high lateral resolution

Real-time monitoring of polyelectrolyte-multilayer growth onto tantalum pentoxide (Ta2O5) by internal reflection ellipsometry (Application Note, 2011)

Real-time monitoring of polyelectrolyte-multilayer growth Accurion

The consecutive deposition of layers of two polyelectrolytes, polyallylamine hydrochloride (PAH) and polyacrylic acid (PAA) onto a tantalum pentoxide substrate was measured by time-resolved ellipsometry in an internal reflection ellipsometry setup. Stepwise increase of polyelectrolyte thickness was shown by time-resolved measurement of the ellipsometric angles, delta and psi. The coated substrate was finally characterized in the dry state.

Effect of PEI anchoring layerand posttreatment after deposition (Literature, 2007)

  • The influence of a first (anchoring) layer and film treatment on the structure and properties of polyelectrolyte multilayer (PEM) films obtained from polyallylamine hydrochloride (PAH) and polysodium 4-styrenesulfonate (PSS) was studied by Kolasinska et al (2007). Branched polyethyleneimine (PEI) was used as an anchoring layer. The film thickness was measured by ellipsometry. Complementary X-ray reflectometry and AFM experiments were performed to study the change in the interfacial roughness.

 

References

Kolasińska M., Krastev R., Warszyński P. (2007) Characteristics of polyelectrolyte multilayers: Effect of PEI anchoring layerand posttreatment after deposition. Journal of Colloid and Interface Science 305, 46-56

Layer-by-layer films of photoactive fullerene- porphyrin dye adsorption (Literature, 2004)

Guldi et al (2004) report the fabrication of high quality, robust and photoactive ITO electrodes—in the form of well-defined two- and three-dimensional films. They follow the Langmuir–Schäfer (LS) and the layer-by-layer (LBL) methods. In the LS approach C60-NiP multilayers were transferred from the air–water interface, while the LBL approach utilizes electrostatic and van der Waals interactions for the step-by-step deposition of individual C60-NiP molecules out of solution.

 

References

Guldi D.M., Zilbermann I., Anderson G.A., Kordatos K., Prato M., Tafuro R., Valli L. (2004) Langmuir-Blodgett and layer-by-layer films of photoactive fullerene- porphyrin dys. Journal of Materials Chemistry 14, 303-309

CONTACT
© Accurion GmbH 2018