University of Groningen
Creating new multifunctional organic-inorganic hybrid materials Wu, Jiquan
IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from it. Please check the document version below.
Document Version
Publisher's PDF, also known as Version of record
Publication date: 2017
Link to publication in University of Groningen/UMCG research database
Citation for published version (APA):
Wu, J. (2017). Creating new multifunctional organic-inorganic hybrid materials. University of Groningen.
Copyright
Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).
Take-down policy
If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum.
Summary
- 105 -
Summary
Hybrid materials provide versatile platform for integrating organic and inorganic building blocks into multifunctional composites. In this Ph.D project, we addressed the design, fabrication and characterization of new multifunctional organic-inorganic hybrid system. These materials offer the important opportunity to combine useful characteristics from each component as well as to create new functionalities which outperform those of the individual building blocks, and are of interest for many future applications in electronics, magnetism, and catalysis, etc.
The studies reported in this dissertation focused on generating new type of organic-inorganic hybrid films in easy processing steps performed at ambient conditions. Langmuir-Blodgett and Langmuir-Schaefer deposition were employed to assemble organic and inorganic blocks at surfaces. These techniques allow to fabricate the hybrid films with excellent control over the thickness as well as over the film structure on a variety of substrates. The details of these techniques as well as of the characterization methods are described in Chapter 2.
In Chapter 3, we report how we synthesized a new type of CoCl4-based hybrid Langmuir
Blodgett film with octahedrally coordinated metal ions in the inorganic layers showing magnetic order, which is different from the tetrahedral coordination in the CoCl4-based bulk hybrid. The
new structure of the hybrid Langmuir Blodgett film goes hand-in-hand with the generation of new magnetic properties, namely antiferromagnetic exchange resulting in ferromagnetic ordering. Most importantly, the ferromagnetic order parameter, the remanent magnetisation can be switched by changing the number of layers. This means that for certain practical applications, this multilayer can still be used as a ferromagnet. A MnCl4-based hybrid Langmuir Blodgett film was
also successfully synthesized but in this case structure and magnetic properties were similar to those of the corresponding bulk hybrid. These results indicate that the assembly by the Langmuir Blodgett technique allows to tailor the layer-by-layer structure easily and to induce new magnetic properties, which make these Langmuir Blodgett films promising candidates for applications in electronics.
In Chapter 4, we detail how we successfully fabricated multilayer of well-ordered metal-decorated (Cu2+ and Fe+3) polyhedral oligomeric silsesquioxanes (POSS) by using the Langmuir Schaefer method. A “flip over” of even AA layers could be observed during the deposition, leading to a periodically repeated AA-Metal(Cu2+ and Fe+3)-POSS-AA building block.
Summary
- 106 -
In recent years, considerable attention has been paid to combine POSS molecules and clay minerals into hybrid systems that benefit from the best properties of both components. In
Chapter 5, we demonstrate the successful insertion of metal-decorated (Fe3+) organic-inorganic
polyhedral oligomeric silsesquioxanes (POSS) into clay template, forming well-ordered hybrid film in a layer-by-layer fashion. The hybrid film deposition was performed by using Langmuir-Schaefer method with a good control of the structure built up during the growth.
In Chapter 6 we describe our X-ray photoemission spectroscopy study of the phase transition of Cu-based organic-inorganic bulk hybrid at TC = 340 K, where we were able to demonstrate that
the chemical environment of Cu, Cl and N is different below and above TC. The combination of
our results with previous X-ray diffraction and Raman spectroscopy results provides a detailed picture of how the structure changes when going through TC.
In conclusion, different organic-inorganic hybrid systems were constructed through state-of-the-art technologies, which allow to stack organic and inorganic building blocks with excellent control over the layer structure. These hybrid materials open new roads in the design and tailoring of materials with desired structural and functional properties.
