Synthesis of Nanoparticles and Organometallic Complexes for Gas Sensing
Doctoral thesis, 2020
This thesis focuses extensively on the synthesis and characterization of Pd NPs for hydrogen sensing. The Pd NPs synthesis was optimized with regard to the concentration needed for efficient response from the sensor. The Pd NPs were incorporated into a polymer matrix to be protected from poisoning, which also led the diffusion path between hydrogen and Pd NPs to be extended. Different stabilizing agents for Pd NPs were examined in order to explore how common stabilizing compounds and their interactions with Pd NPs may influence the sensing process. The work was focused on the use of homogeneous surfactant and polymer coatings on Pd nanofabricated surfaces, which were examined and analyzed in hydrogen sensing. Additionally, to address hydrogen sensing problems i.e. hysteresis, PdAu alloys with various Pd:Au ratios were colloidally synthesized and thoroughly characterized. PdAu alloys exhibited excellent results of hysteresis removal at specific Pd:Au ratios. Moreover, phthalocyanine based complexes; Zn, Co, Cu, Fe, were synthesized for application in NOx monitoring.
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Impact of Surfactants and Stabilizers on Palladium Nanoparticle–Hydrogen Interaction Kinetics: Implications for Hydrogen Sensors
ACS Applied Nano Materials,; Vol. 3(2020)p. 2647-2653
Bulk-Processed Pd Nanocube-Poly(methyl methacrylate) Nanocomposites as Plasmonic Plastics for Hydrogen Sensing
ACS Applied Nano Materials,; Vol. 3(2020)p. 8438-8445
Robust Colloidal Synthesis of Palladium-Gold Alloy Nanoparticles for Hydrogen Sensing
ACS Applied Materials & Interfaces,; Vol. 13(2021)p. 45758-45767
Alicja Stolaś, Irem Tanyeli, Walter Rosas Arbelaez, David Tomecek, Christoph Langhammer, Kasper Moth-Poulsen. " Synthesis of phthalocyanine complexes with gold nanoparticles attachments for NOx sensing"
The current environmental situation requires proper pollution control, since pollution has a very harmful effect on our health. It is equally important to implement activities and processes that will not produce unhealthy by-products as a result. An example of the effective use of these solutions is the replacement of internal combustion cars with hydrogen-powered cars, which results in no emissions. Both when controlling environmental pollution and when using hydrogen as a fuel, it is necessary to use sensors that monitor the levels of toxic gases or inform the user of any leakage. In recent years, nanoparticles of individual metals and organic compounds, which show activity against gases such as nitrogen oxides or hydrogen, have been of particular interest. The subject of this doctoral dissertation is the synthesis of palladium and gold nanoparticles and their alloys. In addition, this work presents an in-depth analysis of the interactions between nanoparticles and the compounds needed to stabilize them, and shows how these interactions affect the hydrogen monitoring process. The remainder of this dissertation focuses on the synthesis of organometallic compounds that could be used to control the level of nitrogen oxide pollution.
Rambidrag inom utlysningen "Materials Science 2015"
Swedish Foundation for Strategic Research (SSF) (RMA15-0052), 2016-05-01 -- 2021-06-30.
Areas of Advance
Nanoscience and Nanotechnology
Composite Science and Engineering
Chalmers Materials Analysis Laboratory
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 4872
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Opponent: Professor Bo Wegge Laursen, Department of Chemistry, University of Copenhagen, Denmark