A5039171823- Graphene research and applications
- 2D Materials and Applications
- Perovskite Materials and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Covalent Organic Framework Applications
- Molecular Junctions and Nanostructures
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced Photocatalysis Techniques
- Chalcogenide Semiconductor Thin Films
- MXene and MAX Phase Materials
- Organic Electronics and Photovoltaics
- Quantum and electron transport phenomena
- Luminescence and Fluorescent Materials
- Synthesis and Properties of Aromatic Compounds
- Advancements in Battery Materials
- Optical properties and cooling technologies in crystalline materials
- Carbon Nanotubes in Composites
- Gas Sensing Nanomaterials and Sensors
- Surface Chemistry and Catalysis
- ZnO doping and properties
- Supercapacitor Materials and Fabrication
- Mechanical and Optical Resonators
Utrecht University
2023-2025
Max Planck Institute for Polymer Research
2014-2025
Capital Normal University
2024
Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital
2024
University of Electronic Science and Technology of China
2024
Jiangsu University of Science and Technology
2024
University of Applied Sciences Mainz
2020
Johannes Gutenberg University Mainz
2014-2018
Delft University of Technology
2013
Abstract Lead‐free double perovskites have great potential as stable and nontoxic optoelectronic materials. Recently, Cs 2 AgBiBr 6 has emerged a promising material, with suboptimal photon‐to‐charge carrier conversion efficiency, yet well suited for high‐energy photon‐detection applications. Here, the structural properties of pure alkali‐metal‐substituted (Cs 1− x Y ) (Y: Rb + , K Na ; = 0.02) single crystals are investigated. Strikingly, alkali‐substitution entails tunability to material...
Developing efficient artificial photocatalysts for the biomimetic photocatalytic production of molecular materials, including medicines and clean energy carriers, remains a fundamentally technologically essential challenge. Hydrogen peroxide is widely used in chemical synthesis, medical disinfection, energy. However, current industrial production, predominantly by anthraquinone oxidation, suffers from hefty penalties toxic byproducts. Herein, we report hydrogen protonation-induced...
2D transition metal carbides and/or nitrides, so-called MXenes, are noted as ideal fast-charging cation-intercalation electrode materials, which nevertheless suffer from limited specific capacities. Herein, it is reported that constructing redox-active phosphorus-oxygen terminals can be an attractive strategy for Nb4 C3 MXenes to remarkably boost their capacities ultrafast Na+ storage. As revealed, with a stoichiometric formula of PO2 - display metaphosphate-like configuration each P atom...
Two-dimensional (2D) covalent organic frameworks (COFs) are an emerging class of promising 2D materials with high crystallinity and tunable structures. However, the low electrical conductivity impedes their applications in electronics optoelectronics. Integrating large π-conjugated building blocks into lattices to enhance efficient π-stacking chemical doping is effective way improve COFs. Herein, two nonplanar COFs kagome (DHP-COF) rhombus (c-HBC-COF) have been designed synthesized from...
Two-dimensional covalent organic frameworks (2D COFs) represent a family of crystalline porous polymers with long-range order and well-defined open nanochannels that hold great promise for electronics, catalysis, sensing, energy storage. To date, the development highly conductive 2D COFs has remained challenging due to finite π-conjugation along lattice charge localization at grain boundaries. Furthermore, transport mechanism within framework remains elusive. Here, time- frequency-resolved...
Abstract MXenes are emerging layered materials that promising for electrochemical energy storage and (opto-)electronic applications. A fundamental understanding of charge transport in is essential such applications, but has remained under debate. While theoretical studies pointed to efficient band transport, device measurements have revealed thermally activated, hopping-type transport. Here we present a unifying picture two model by combining ultrafast terahertz static electrical distinguish...
Abstract Two-dimensional conjugated polymers (2DCPs), composed of multiple strands linear with extended in-plane π-conjugation, are emerging crystalline semiconducting for organic (opto)electronics. They represented by two-dimensional π-conjugated covalent frameworks, which typically suffer from poor π-conjugation and thus low charge carrier mobilities. Here we overcome this limitation demonstrating two phthalocyanine-based poly(benzimidazobenzophenanthroline)-ladder-type 2DCPs (2DCP-MPc, M...
Two-dimensional conjugated metal–organic frameworks (2D c-MOFs) have attracted increasing interest in electronics due to their (semi)conducting properties. Charge-neutral 2D c-MOFs also possess persistent organic radicals that can be viewed as spin-concentrated arrays, affording new opportunities for spintronics. However, the strong π-interaction between neighboring layers of layer-stacked annihilates active spin centers and significantly accelerates relaxation, severely limiting potential...
Abstract Graphene nanoribbons (GNRs), nanometre-wide strips of graphene, are promising materials for fabricating electronic devices. Many GNRs have been reported, yet no scalable strategies known synthesizing with metal atoms and heteroaromatic units at precisely defined positions in the conjugated backbone, which would be valuable tuning their optical, magnetic properties. Here we report solution-phase synthesis a porphyrin-fused graphene nanoribbon (PGNR). This PGNR has metalloporphyrins...
The development of efficient and low-cost catalysts is essential for photocatalysis; however, the intrinsically low photocatalytic efficiency as well difficulty in using recycling photocatalysts powder morphology greatly limit their practical performance. Herein, we describe quasi-homogeneous photocatalysis to overcome these two limitations by constructing ultrastiff, hierarchically porous, photoactive aerogels conjugated microporous polymers (CMPs). CMP exhibit density but high stiffness...
Since the seminal work on MoS 2 , photoexcitation in atomically thin transition metal dichalcogenides (TMDCs) has been assumed to result excitons, with binding energies order of magnitude larger than thermal energy at room temperature. Here, we reexamine this foundational assumption and show that TMDC monolayers can a substantial population free charges. Performing ultrafast terahertz spectroscopy large-area, single-crystal monolayers, find up ~10% excitons spontaneously dissociate into...
Abstract Notwithstanding the success of lead‐halide perovskites in emerging solar energy conversion technologies, many fundamental photophysical phenomena this material remain debated. Here, initial steps following photogeneration free charge carriers lead‐iodide are studied, and timescales carrier cooling polaron formation, as a function temperature excess energy, quantified. It is found, using terahertz time‐domain spectroscopy (THz‐TDS), that observed femtosecond rise photoconductivity...
For many of the envisioned optoelectronic applications graphene it is crucial to understand sub-picosecond carrier dynamics immediately following photoexcitation, as well effect on electrical conductivity - photoconductivity. Whereas these topics have been studied using various ultrafast experiments and theoretical approaches, controversial incomplete explanations put forward concerning sign photoconductivity, occurrence significance creation additional electron-hole pairs, and, in...
Stimuli-responsive micro-supercapacitors (MSCs) controlled by external stimuli can enable a wide range of applications for future on-chip energy storage. Here, we report on photoswitchable MSC based diarylethene-graphene composite film. The microdevice delivers an outstanding and reversible capacitance modulation up to 20%, demonstrating prototype MSC. Terahertz spectroscopy indicates that the photoswitching is enabled tuning interfacial charge injection into diarylethene molecular orbitals,...
Recent advances in bottom-up synthesis of atomically defined graphene nanoribbons (GNRs) with various microstructures and properties have demonstrated their promise electronic optoelectronic devices. Here we synthesized N = 9 armchair (9-AGNRs) a low optical band gap ∼1.0 eV extended absorption into the infrared range by an efficient chemical vapor deposition process. Time-resolved terahertz spectroscopy was employed to characterize photoconductivity 9-AGNRs revealed high intrinsic...
Ultrafast spectroscopies shed light on charge carrier transfer and recombination across van der Waals heterostructures.
Semiconductor nanoplatelets exhibit spectrally pure, directional fluorescence. To make polarized light emission accessible and the charge transport effective, have to be collectively oriented in solid state. We discovered that collective orientation monolayers can controlled kinetically by exploiting solvent evaporation rate self-assembly at liquid interfaces. Our method avoids insulating additives such as surfactants, making it ideally suited for optoelectronics. The monolayer films with...
Graphene nanoribbons (GNRs) with atomically precise width and edge structures are a promising class of nanomaterials for optoelectronics, thanks to their semiconducting nature high mobility charge carriers. Understanding the fundamental static optical properties ultrafast dynamics carrier generation in GNRs is essential optoelectronic applications. Combining THz spectroscopy theoretical calculations, we report strong exciton effect binding energy up ∼700 meV liquid-phase-dispersed 1.7 nm an...
Many promising optoelectronic devices, such as broadband photodetectors, nonlinear frequency converters, and building blocks for data communication systems, exploit photoexcited charge carriers in graphene. For these it is essential to understand the relaxation dynamics after photoexcitation. These contain a sub-100 fs thermalization phase, which occurs through carrier-carrier scattering leads carrier distribution with an elevated temperature. This followed by picosecond cooling where...
Synthesis of covalent organic frameworks (COFs) with desirable units furnishes advanced materials unique functionalities. As an emerging class two-dimensional (2D) COFs, sp
As a new family of semiconductors, graphene nanoribbons (GNRs), nanometer-wide strips graphene, have appeared as promising candidates for next-generation nanoelectronics. Out-of-plane deformation π-frames in GNRs brings further opportunities optical and electronic property tuning. Here we demonstrate novel fjord-edged GNR (FGNR) with nonplanar geometry obtained by regioselective cyclodehydrogenation. Triphenanthro-fused teropyrene 1 pentaphenanthro-fused quateropyrene 2 were synthesized...