Leiden University Scholarly Publications

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Roorda, T. (2025)

Exploring reactive interfaces: nanoplastics, catalysts, and 2D materials

Doctoral Thesis
This thesis investigates reactive interfaces in surface science across three domains: heterogeneous catalysis, environmental nanoplastics, and two-dimensional materials. A central achievement is the development of the ReactorAFM/STM, an instrument enabling simultaneous atomic force and scanning tunneling microscopy under elevated pressures and temperatures. Using this setup, catalytic reactions such as Pd(100) oxidation and Fischer–Tropsch synthesis on cobalt nanoparticles were studied under near-industrial conditions, bridging the traditional pressure and materials gaps. 
To address the challenge of nanoplastic pollution, new laboratory protocols were established for producing and analyzing nanoplastics on well-defined surfaces. Physical vapor deposition is introduced as a controllable route to model environmental degradation and support systematic studies of nanoplastic behavior.
Finally, the controlled growth of hexagonal boron nitride (h-BN) on Ni...Show moreThis thesis investigates reactive interfaces in surface science across three domains: heterogeneous catalysis, environmental nanoplastics, and two-dimensional materials. A central achievement is the development of the ReactorAFM/STM, an instrument enabling simultaneous atomic force and scanning tunneling microscopy under elevated pressures and temperatures. Using this setup, catalytic reactions such as Pd(100) oxidation and Fischer–Tropsch synthesis on cobalt nanoparticles were studied under near-industrial conditions, bridging the traditional pressure and materials gaps. 
To address the challenge of nanoplastic pollution, new laboratory protocols were established for producing and analyzing nanoplastics on well-defined surfaces. Physical vapor deposition is introduced as a controllable route to model environmental degradation and support systematic studies of nanoplastic behavior.
Finally, the controlled growth of hexagonal boron nitride (h-BN) on Ni(111) using a novel molecular precursor was investigated through synchrotron-based spectroscopy and microscopy, revealing key aspects of 2D-material formation.
Together, these studies demonstrate how advanced microscopy and operando experimentation can reveal processes at surfaces under realistic conditions, contributing to both fundamental science and environmental understanding.Show less
Surface Science
Operando Microscopy
Atomic Force Microscopy (AFM)
Scanning Tunneling Microscopy (STM)
Catalysis
Nanoplastics
Reactive Interfaces
Hexagonal Boron Nitride (h-BN)
Two-Dimensional Materials
qPlus
All authors
Roorda, T.
Supervisor
Groot, I.M.N.; Koper, M.T.M.
Committee
Ubbink, M.; Oosterkamp, T.; Geuchies, J.J.; Weckhuysen, B.M.; Maier, S.
Qualification
Doctor (dr.)
Awarding Institution
Leiden Institute of Chemistry (LIC), Faculty of Science, Leiden University
Date
2025-10-21