Dr. Michael J. Bojdys

Dr. Bojdys erforscht zweidimensionale Materialien jenseits von Graphen, um neue funktionale Schichten für elektronische Anwendungen zu entwickeln – insbesondere Materialien mit definierten elektronischen Eigenschaften, die Silizium ähneln und bislang fehlen. Parallel arbeitet er an Lithium-Anode-Materialien für Batterien mit höherer Energiedichte, um die Herstellung von Li-Ionen-Batterien effizienter und skalierbarer zu gestalten. Seine Forschung zielt darauf ab, neue Materialklassen zu synthetisieren und zu charakterisieren, die sowohl für die Elektronik als auch für die Energiespeicherung in Verbraucherprodukten und Elektrofahrzeugen einsetzbar sind.

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• Layered Functional Materials – Beyond “Graphene” (BEGMAT)

  Quelle ↗

  There is an apparent lack of non-metallic 2D-matrials for the construction of electronic devices, as only five materials of the “graphene family” are known: graphene, hBN, BCN, fluorographene, and graphene oxide – none of them with a narrow bandgap close to commercially used silicon. This ERC-StG proposal, BEGMAT, outlines a strategy for design, synthesis, and application of layered, functional materials that will go beyond this exclusive club. These materials “beyond graphene” (BEG) will have to meet – like graphene – the following criteria:(1) The BEG-materials will feature a transfer of crystalline order from the molecular (pm-range) to the macroscopic level (cm-range),(2) individual, free-standing layers of BEG-materials can be addressed by mechanical or chemical exfoliation, and(3) assemblies of different BEG-materials will be stacked as van der Waals heterostructures with unique properties.In contrast to the existing “graphene family”,(4) BEG-materials will be constructed in a controlled way by covalent organic chemistry in a bottom-up approach from abundant precursors free of metals and critical raw materials (CRMs).Moreover – and unlike – many covalent organic frameworks (COFs),(5) BEG-materials will be fully aromatic, donor-acceptor systems to ensure that electronic properties can be addressed on macroscopic scale.The potential to make 2D materials “beyond graphene” is a great challenge to chemical bond formation and material design. In 2014 the applicant has demonstrated the feasibility of the concept to expand the “graphene family” with triazine-based graphitic carbon, a compound highlighted as an “emerging competitor for the miracle material” graphene. Now, the PI has the opportunity to build a full-scale research program on layered functional materials that offers unique insights into controlled, covalent linking-chemistry, and that addresses practicalities in device manufacture, and structure-properties relationships.

• Ultra-High Energy Storage Li-Anode Materials (LiAnMAT)

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• Triazine‐Based Graphitic Carbon Nitride: a Two‐Dimensional Semiconductor

  2014

  Angewandte Chemie International Edition · DOI

  Graphitic carbon nitride has been predicted to be structurally analogous to carbon-only graphite, yet with an inherent bandgap. We have grown, for the first time, macroscopically large crystalline thin films of triazine-based, graphitic carbon nitride (TGCN) using an ionothermal, interfacial reaction starting with the abundant monomer dicyandiamide. The films consist of stacked, two-dimensional (2D) crystals between a few and several hundreds of atomic layers in thickness. Scanning force and transmission electron microscopy show long-range, in-plane order, while optical spectroscopy, X-ray photoelectron spectroscopy, and density functional theory calculations corroborate a direct bandgap between 1.6 and 2.0 eV. Thus TGCN is of interest for electronic devices, such as field-effect transistors and light-emitting diodes.

• Triazine‐Based Graphitic Carbon Nitride: a Two‐Dimensional Semiconductor

  2014

  Angewandte Chemie · DOI

  Abstract Graphitic carbon nitride has been predicted to be structurally analogous to carbon‐only graphite, yet with an inherent bandgap. We have grown, for the first time, macroscopically large crystalline thin films of triazine‐based, graphitic carbon nitride (TGCN) using an ionothermal, interfacial reaction starting with the abundant monomer dicyandiamide. The films consist of stacked, two‐dimensional (2D) crystals between a few and several hundreds of atomic layers in thickness. Scanning force and transmission electron microscopy show long‐range, in‐plane order, while optical spectroscopy, X‐ray photoelectron spectroscopy, and density functional theory calculations corroborate a direct bandgap between 1.6 and 2.0 eV. Thus TGCN is of interest for electronic devices, such as field‐effect transistors and light‐emitting diodes.