Publications by authors named "Theodosis Giousis"
Article Synopsis
- Germanane (GeH) and silicane (SiH) are promising 2D materials from the Xanes family with potential uses in electronics and energy storage due to their unique properties.
- Traditional methods of synthesizing these materials typically involve dangerous acids like HCl and HF, which can be slow and pose safety risks.
- A new synthesis method using hydrochloric acid combined with lithium fluoride generates HF in a safer and faster way, producing high-quality GeH and SiH with suitable bandgaps for semiconductor applications.
Article Synopsis
- Group-14 Xenes like silicene, germanene, and stanene are being explored for their unique electronic properties that can be modified through covalent functionalization.
- A new method for creating thin layers of covalently functionalized germanene through a chemical reaction has been introduced, producing sheets only about 6 nm thick, much thinner than previous methods.
- The functionalization process increases the optical bandgap of germanene by 500 meV, indicating potential for advanced applications in electronics and catalysis.
Polydopamine is a biomimetic self-adherent polymer, which can be easily deposited on a wide variety of materials. Despite the rapidly increasing interest in polydopamine-based coatings, the polymerization mechanism and the key intermediate species formed during the deposition process are still controversial. Herein, we report a systematic investigation of polydopamine formation on halloysite nanotubes; the negative charge and high surface area of halloysite nanotubes favour the capture of intermediates that are involved in polydopamine formation and decelerate the kinetics of the process, to unravel the various polymerization steps.
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- - Germanane (GeH) is a promising material similar to graphane, known for its interesting optoelectronic properties, but its environmental and biological impacts haven't been well studied.
- - Researchers have developed a simple method, using Langmuir-Schaefer deposition, to create uniform GeH monolayer films on different surfaces.
- - This study is the first to explore the antibacterial properties of GeH, revealing that it effectively combats both Gram-negative and Gram-positive bacteria, suggesting potential new applications for this material.
Synthesis of 2D Germanane (GeH): a New, Fast, and Facile Approach.
Angew Chem Int Ed Engl
January 2021
Article Synopsis
- - Germanane (GeH) is a 2D material that's gaining attention for its potential use in electronics, solar cells, and photocatalysis due to its impressive properties.
- - Traditional methods to synthesize GeH are slow, taking 6 to 14 days, but a new technique allows for room temperature synthesis in just a few minutes, making it much more practical for use.
- - The new synthesis method produces highly pure GeH with a band gap of about 1.4 eV, which is an improvement for applications like solar energy conversion.
Similar to carbon, germanium exists in various structures such as three-dimensional crystalline germanium and germanene, a two-dimensional germanium atomic layer. Regarding the electronic properties, they are either semiconductors or Dirac semimetals. Here, we report a highly conductive metallic state in thermally annealed germanane (hydrogen-terminated germanene, GeH), which shows a resistivity of ∼10 Ω·m that is orders of magnitude lower than any other allotrope of germanium.
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