A5010426590- Silicon Nanostructures and Photoluminescence
- Graphene research and applications
- Nanowire Synthesis and Applications
- Carbon and Quantum Dots Applications
- Conducting polymers and applications
- Advanced Photocatalysis Techniques
- Semiconductor materials and devices
- Advanced Polymer Synthesis and Characterization
- Luminescence and Fluorescent Materials
- 2D Materials and Applications
- MXene and MAX Phase Materials
- Photopolymerization techniques and applications
- Photonic and Optical Devices
- Carbon Nanotubes in Composites
- Advanced biosensing and bioanalysis techniques
- Silicone and Siloxane Chemistry
- Graphene and Nanomaterials Applications
- Covalent Organic Framework Applications
- Chemical Synthesis and Reactions
- Quantum Dots Synthesis And Properties
- Ga2O3 and related materials
- Thallium and Germanium Studies
- Advanced Materials and Mechanics
- Supercapacitor Materials and Fabrication
- Semiconductor materials and interfaces
Technical University of Munich
2012-2018
Max Planck Computing and Data Facility
2018
University of Cambridge
2015
Purdue University West Lafayette
2015
University of Portsmouth
2015
National Institute of Standards and Technology
2015
Northeastern University
2015
North Carolina State University
2015
Panasonic (Japan)
2015
University of Alberta
2014
Herein we present the functionalization of freestanding silicon nanosheets (SiNSs) by radical-induced hydrosilylation reactions. An efficient Si-H terminated SiNSs can be achieved thermal initiation or addition diazonium salts with a variety alkene alkyne derivatives. The is applicable for wide substrates different functionalities, improving stability and dispersibility functional in organic solvents potentially opening up new fields application these hybrid materials.
The synthesis of germanium nanomaterials with well-defined surface chemistry is considerable interest because not only general scientific curiosity but also their vast potential in optoelectronics, energy storage, and the semiconductor industry. Herein, we report a straightforward preparative route that yields hydride-terminated nanosheet (H-GeNS) monolayers via sonochemical exfoliation germanane flakes (HGe-flakes) derived from crystalline CaGe2. We subsequently show these freestanding...
Herein, the synthesis and characterization of first polymeric nanocomposite based on silicon nanosheets (SiNSs) are reported. In a one‐step reaction, formation matrix material simultaneous functionalization SiNSs with polymers occur via radical polymerization organic monomers such as styrene, methyl methacrylate, acrylic acid. Depending purification method used, covalently linked or functionalized obtained. decompose when exposed to basic conditions UV light. The UV‐light‐based decomposition...
Abstract We present a method to combine the functional features of poly(diethyl vinylphosphonate) (PDEVP) and photoluminescent silicon nanocrystals. The polymer–particle hybrids were synthesized in three steps through surface‐initiated group transfer polymerization using Cp 2 YCH TMS(thf) as catalyst. This pathway particle modification renders nanoparticle surface stable against oxidation. Although SiNC properties are known be sensitive toward transition metals, hybrid particles exhibit red...
The reactivity of diazonium salts towards freestanding, photoluminescent silicon nanocrystals (SiNCs) is reported. It was found that SiNCs can be functionalized with aryl groups by direct reductive grafting the salts. Furthermore, are efficient radical initiators for SiNC hydrosilylation. For this purpose, novel electron-deficient salts, highly soluble in nonpolar solvents were synthesized. a variety alkenes and alkynes at room temperature short reaction times.
Silicon nanocrystals (SiNCs) are abundant and exhibit exquisitely tailorable optoelectronic properties. The incorporation of SiNCs into highly porous lightweight substrates such as aerogels leads to hybrid materials possessing the attractive features both materials. This study describes covalent deposition on intercalation silica aerogels, explores properties, demonstrates a prototype sensing application composite material. different sizes were functionalized with triethoxyvinylsilane (TEVS)...
Various Lewis acids are found to efficiently catalyze hydrosilylation reactions of hydride‐terminated 2D silicon nanosheets at room temperature. The can be functionalized with a variety unsaturated functional substrates and still possess their unique characteristic (opto)electronic properties (e.g., photoluminescence). This is demonstrated by successfully implementing the readily materials into new silicon/semiconducting polymer‐based field‐effect transistors (FETs). Surface modification...
Abstract The straightforward synthesis of a series poly(thioether)s by photoinduced thiol‐ene click polyaddition α,ω‐alkylene thiols is reported. It found that linear and telechelic can be directly obtained from with, for example, alkyl chain length m = 1,2,3, 9. reaction proceeds without additives such as (radical) initiators or metal compounds simply carried out UV‐irradiation the bulk monomer solution. Ex situ kinetic studies reveal typical step‐growth mechanism. As homologue are now...
Abstract We present a method to combine the functional features of poly(diethyl vinylphosphonate) (PDEVP) and photoluminescent silicon nanocrystals. The polymer–particle hybrids were synthesized in three steps through surface‐initiated group transfer polymerization using Cp 2 YCH TMS(thf) as catalyst. This pathway particle modification renders nanoparticle surface stable against oxidation. Although SiNC properties are known be sensitive toward transition metals, hybrid particles exhibit red...
The fabrication of electronic devices from sensitive, functional, two-dimensional (2D) nanomaterials with anisotropic structural properties has attracted much attention. Many theoretical and experimental studies have been performed; however, such materials not used in applications. In this context, the focus shifted toward study synthesis new materials. Freestanding hydrogen-terminated silicon nanosheets (SiNSs) are a class material outstanding (opto)electronic (e.g. photoluminescence at...
Diaryliodonium salts were found to initiate hydrosilylation reactions on the surface of silicon nanosheets as well nanocrystals different sizes. A variety functional substrates can be used stabilize photoluminescent materials. Additionally, combination hydride terminated nanomaterials with diaryliodonium was cationic ring opening polymerization, demonstrating potential based coinitiators and enabling a mild, straightforward reaction method.
In this letter a method is described to synthesize new polysiloxane architectures by photoacid catalysis. An oxasilaspirocycle designed that able undergo generator catalyzed ring-opening reaction leading either homopolymer or copolymers with hydroxyl-terminated polydimethylsiloxane. These polymers feature defined amount of double bonds in the backbone, which controlled ratio comonomer. The former was prepared trispentafluorophenylborane-catalyzed intramolecular hydrosilylation...
This work introduces microwave-assisted thermal hydrosilylation reaction for the functionalization of silicon nanosheets, leading to successful electronic interaction within SiNS–substrate/P3HT-based hybrid blends.
Among a variety of SiNC functionalization methods, radical initiated grafting is very promising due to its straightforward nature and low propensity form surface oligomers. In the present study, we employed in situ IR spectroscopy combination with visible light transmittance measurements investigate induced process on well-defined SiNCs. Our findings support proposed model: unfunctionalized hydride-terminated SiNCs agglomerates organic solvents, which break up during process. However,...
Poly (dialkyl vinylphosphonate)s (PDAVPs) are an interesting class of polymers due to their thermoresponsive behavior close the physiological range.[1] Rare Earth Metal-Mediated Group Transfer Polymerization (REM-GTP) is used synthesize PDAVPs with narrow PDIs and high molecular weights.[2] In further studies we have shown functionalization hydride terminated silicon surfaces applying Surface-Initiated GTP. These exhibit a temperature dependent change polarity.[3] We similar strategies...
B. Rieger and co-workers describe on page 6711 the synthesis of silicon nanosheet based composite materials. The two-dimensional monolayers exhibit outstanding (opto)electronic properties, but were found to be sensitive UV light. In synthesized composites they keep their unique characteristics are protected from external influences. authors would like thank Johannes Richers for design artwork TUM GS financial support.
The reactivity of diazonium salts towards freestanding, photoluminescent silicon nanocrystals (SiNCs) is reported. It was found that SiNCs can be functionalized with aryl groups via direct reductive grafting the salts. Furthermore proved to act as efficient radical initiators for SiNC hydrosilylation. For this purpose, novel electron deficient salts, highly soluble in nonpolar solvents, were synthesized. Thus a variety alkenes and alkynes at room temperature short reaction times.