A5001725286- Graphene research and applications
- Carbon Nanotubes in Composites
- Fullerene Chemistry and Applications
- 2D Materials and Applications
- Molecular Junctions and Nanostructures
- Graphene and Nanomaterials Applications
- Advancements in Battery Materials
- Synthesis and Properties of Aromatic Compounds
- MXene and MAX Phase Materials
- Perovskite Materials and Applications
- Covalent Organic Framework Applications
- Advanced Photocatalysis Techniques
- Porphyrin and Phthalocyanine Chemistry
- Conducting polymers and applications
- Advanced Chemical Physics Studies
- Luminescence and Fluorescent Materials
- Laser-Ablation Synthesis of Nanoparticles
- Nanopore and Nanochannel Transport Studies
- Boron and Carbon Nanomaterials Research
- Electrocatalysts for Energy Conversion
- Diamond and Carbon-based Materials Research
- Mechanical and Optical Resonators
- Quantum and electron transport phenomena
- Surface Chemistry and Catalysis
- Synthesis and properties of polymers
Friedrich-Alexander-Universität Erlangen-Nürnberg
2015-2024
Klinikum Fürth
2016-2020
Institute of Organic Chemistry
2018
International Council on Mining and Metals
2015
Institute for New Media
2013
Freie Universität Berlin
2009
Scripps Research Institute
2005-2006
University of Auckland
2003
University of California, Riverside
2003
The University of Sydney
2003
Few layer black phosphorus is a new two-dimensional material which of great interest for applications, mainly in electronics. However, its lack stability severely limits our ability to synthesise and process this material. Here we demonstrate that high-quality, few-layer nanosheets can be produced large quantities by liquid phase exfoliation the solvent N-cyclohexyl-2-pyrrolidone (CHP). We control nanosheet dimensions have developed metrics estimate both size thickness spectroscopically....
We present an overview of the main techniques for production and processing graphene related materials (GRMs), as well key characterization procedures. adopt a 'hands-on' approach, providing practical details procedures derived from literature authors' experience, in order to enable reader reproduce results.
We report on a fast and simple method to produce highly stable isopropanol/water (4:1) suspensions of few-layer antimonene by liquid-phase exfoliation antimony crystals in process that is assisted sonication but does not require the addition any surfactant. This straightforward generates dispersions suitable for on-surface isolation. Analysis atomic force microscopy, scanning transmission electron energy loss spectroscopy confirmed formation high-quality nanosheets with large lateral...
Although transition metal dichalcogenides such as MoS2 have been recognized highly potent two-dimensional nanomaterials, general methods to chemically functionalize them are scarce. Herein, we demonstrate a functionalization route that results in organic groups bonded the surface via covalent C–S bonds. This is based on lithium intercalation, chemical exfoliation and subsequent quenching of negative charges residing by electrophiles diazonium salts. Typical degrees 10–20 atom % potentially...
Herein, we have developed a systematic study on the oxidation and passivation of mechanically exfoliated black phosphorus (BP). We analyzed strong anisotropic behavior BP by scanning Raman microscopy providing an accurate method for monitoring via statistical spectroscopy. Furthermore, different factors influencing environmental instability BP, i.e., thickness, lateral dimensions or visible light illumination, been investigated in detail. Finally, discovered that degradation few-layer flakes...
Black phosphorus (BP) was functionalized with organic moieties on the basis of liquid exfoliation. The treatment BP electron-withdrawing 7,7,8,8-tetracyano-p-quinodimethane (TCNQ) led to electron transfer from dopant. On other hand, noncovalent interaction a perylene diimide mainly due van der Waals interactions but also considerable stabilization flakes against oxygen degradation.
Single-layer graphene (SLG) is deposited onto Si/SiO2 substrates from aqueous dispersions using a scalable and quick detergent-based method (see figure). The deposits are analyzed absorption Raman spectroscopy atomic force optical microscopy. Evaluation of the two-phonon defect-induced peak individual particles on substrate used to confirm exfoliation into monolayers.
We report on the introduction of a systematic method for quantitative and reliable characterization covalently functionalized graphene based Scanning-Raman-Microscopy (SRM). This allows recording analyzing several thousands Raman spectra per sample straightforward display various properties their correlations with each other in histograms or coded 2D-plots. In this way, information about functionalization efficiency given reaction, reproducibility statistical analysis, homogeneity can be...
Abstract The verification of a successful covalent functionalization graphene and related carbon allotropes can easily be carried out by Raman spectroscopy. Nevertheless, the unequivocal assignment resolution individual lattice modes associated with binding addends was elusive up to now. Here we present an in situ study controlled potassium intercalated graphite, revealing several new bands appearing D-region spectrum. evolution these increasing degree from low moderate levels provides basis...
The aqueous dispersion of SWCNTs in the presence water-soluble perylene derivatives 1−3 is reported. Significantly, even very low concentrations perylenes such as 0.01 wt% amphiphilic derivative 3, cause an efficient dissolution water accompanied by a pronounced individualization. individualization after ultrasonication aromatic was investigated detail absorption, emission, and Raman spectroscopy well AFM cryo-TEM. These studies also revealed that caused adsorption 3 much more effective than...
The synthesis of perylene-based single-walled carbon nanotube (SWCNT) surfactants and the dispersion exfoliation SWCNTs in water by a variety designed is investigated. quality dispersions evaluated optical absorption emission spectroscopy, zeta-potential measurements statistical atomic force microscopy (AFM). Significantly efficiency can be increased at higher pH, as solubility ensured peripheral derivatization with carboxyl-functionalized first- second-order Newkome dendrimers. Even very...
Mutual attraction: π–π bonding promotes electronic interactions between graphene and a π-conjugated perylene in liquid dispersion. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by the authors. Please note: The publisher is responsible for content functionality any supporting information supplied Any queries (other than missing content) should be directed...
Chemistry meets graphane: A Birch-type reaction using frozen water as a gentle proton source causes the exfoliation of graphite and formation hydrogenated graphene with electronically decoupled π-nanodomains. This highly functionalized displays pronounced fluorescence. As service to our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized for online delivery, but not copy-edited or typeset. Technical support...
Abstract We report on a fast and simple method to produce highly stable isopropanol/water (4:1) suspensions of few‐layer antimonene by liquid‐phase exfoliation antimony crystals in process that is assisted sonication but does not require the addition any surfactant. This straightforward generates dispersions suitable for on‐surface isolation. Analysis atomic force microscopy, scanning transmission electron energy loss spectroscopy confirmed formation high‐quality nanosheets with large...
Antimonene, a novel group 15 two-dimensional material, is functionalized with tailormade perylene bisimide through strong van der Waals interactions. The functionalization process leads to significant quenching of the fluorescence, and surpasses that observed for either graphene or black phosphorus, thus allowing straightforward characterization flakes by scanning Raman microscopy. Furthermore, photoelectron microscopy studies theoretical calculations reveal remarkable charge-transfer...
The selective dispersion of single-walled carbon nanotube species (n,m) with conjugated polymers such as poly(9,9-dioctylfluorene) (PFO) and poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) in organic solvents depends not only on the type solvent but also molecular weight polymer. We find an increasing amount nanotubes altered selectivities for dispersions higher polymers. Including effects different aromatic solvents, we propose that solution viscosity is one factors influencing...
Abstract The synthesis and characterization of sidewall‐functionalized SWNT derivatives ( n PrNH) ‐SWNTs containing ‐propylamine addends is reported. nucleophilic addition in situ generated lithium ‐propylamide to the sidewall SWNTs subsequent reoxidation charged intermediates type ‐SWNT – leads carbon nanotube with covalently attached amino groups. Based on reaction sequence, a homogeneous dispersion material achieved as result electrostatic repulsion negatively intermediates. solubility...
Abstract Carbon nanotubes and graphene are outstanding materials of the 21 st century with a broad spectrum applications. However, major challenges faced such as intrinsically low solubility both sp 2 carbon allotropes. To overcome this hurdle potential noncovalent functionalization is summarized special focus on establishment perylene bisimide unit aromatic anchor to graphitic surface. Rational surfactant design unmasked key solubilization allotropes, while at same time tailoring their...
Graphene–porphyrin nanohybrid materials with a direct covalent linkage between the graphene carbon network and functional porphyrin unit have been successfully synthesized via one-pot reductive diazotation approach. A graphite–potassium intercalation compound (KC8) was dispersed in THF, different isolated porphyrin–diazonium salts were added. The binding detailed characterization of hybrid material carried out by Raman spectroscopy, TG-MS, UV/vis, fluorescence spectroscopy. LDI-ToF mass...
Abstract Black phosphorus intercalation compounds (BPICs) with alkali metals (namely: K and Na) have been synthesized in bulk by solid‐state as well vapor‐phase reactions. By means of a combination situ X‐ray diffraction, Raman spectroscopy, DFT calculations the structural behavior BPICs at different stages has demonstrated for first time. Our results provide glimpse into very steps new family compounds, distinct compared to its graphite analogues (GICs), showing remarkable complexity...