A5090263529- Ion-surface interactions and analysis
- Electron and X-Ray Spectroscopy Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Perovskite Materials and Applications
- Nanoparticles: synthesis and applications
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Advanced Electron Microscopy Techniques and Applications
- Diamond and Carbon-based Materials Research
- Mass Spectrometry Techniques and Applications
- Chalcogenide Semiconductor Thin Films
- Copper-based nanomaterials and applications
- Hydrocarbon exploration and reservoir analysis
- Trace Elements in Health
- Organic Electronics and Photovoltaics
- Nuclear Physics and Applications
- Per- and polyfluoroalkyl substances research
- Electronic and Structural Properties of Oxides
- Toxic Organic Pollutants Impact
- Block Copolymer Self-Assembly
- Nanopore and Nanochannel Transport Studies
- Hydraulic Fracturing and Reservoir Analysis
- Microbial Community Ecology and Physiology
- Advancements in Solid Oxide Fuel Cells
- Mercury impact and mitigation studies
Luxembourg Institute of Science and Technology
2016-2025
University of Stavanger
2015-2023
Friedrich-Alexander-Universität Erlangen-Nürnberg
2021
Freie Universität Berlin
2021
Flemish Institute for Technological Research
2021
Fraunhofer Institute for Ceramic Technologies and Systems
2021
New York University Press
2015
International Research Institute of Stavanger
2015
Indiana University
2015
Universidad Nacional de Córdoba
2015
Abstract Food-grade titanium dioxide (TiO 2 ) containing a nanoscale particle fraction -NPs) is approved as white pigment (E171 in Europe) common foodstuffs, including confectionary. There are growing concerns that daily oral TiO -NP intake associated with an increased risk of chronic intestinal inflammation and carcinogenesis. In rats orally exposed for one week to E171 at human relevant levels, was detected the immune cells Peyer’s patches (PP) observed model NM-105. Dendritic cell...
Understanding the crystallization process of organic–inorganic halide perovskites is paramount importance for fabrication reproducible and efficient perovskite solar cells. We report first time on discovery interplay ubiquitous hexagonal polytypes (6H 4H) during mixed ion perovskite, namely (FAPbI3)x(MAPbBr3)1–x. These polytypes, reported 3D lead-halide-based perovskites, orchestrate a sequence revealed as 2H (delta phase)-4H-6H-3R(3C), commonly found among inorganic transition metal oxide...
Compositional engineering of a mixed cation/mixed halide perovskite in the form (FAPbI3)0.85(MAPbBr3)0.15 is one most effective strategies to obtain record-efficiency solar cells. However, self-organization upon crystallization and final elemental distribution, which are paramount for device optimization, still poorly understood. Here we map nanoscale charge carrier distribution films yielding 20% efficient devices. Combining novel in-house-developed high-resolution helium ion microscope...
Abstract Organic halide salt passivation is considered to be an essential strategy reduce defects in state-of-the-art perovskite solar cells (PSCs). This strategy, however, suffers from the inevitable formation of in-plane favored two-dimensional (2D) layers with impaired charge transport, especially under thermal conditions, impeding photovoltaic performance and device scale-up. To overcome this limitation, we studied energy barrier 2D ortho- , meta- para- isomers...
Abstract Perovskite solar cells (PSCs) are among the most promising photovoltaic technologies owing to their exceptional optoelectronic properties 1,2 . However, lower efficiency, poor stability and reproducibility issues of large-area PSCs compared with laboratory-scale notable drawbacks that hinder commercialization 3 Here we report a synergistic dopant-additive combination strategy using methylammonium chloride (MACl) as dopant Lewis-basic ionic-liquid additive,...
A new polymer blend formed by poly(3-hexylthiophene)-poly(4-vinylpyridine) (P3HT- P4VP) block copolymers and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is reported. The P4VP PCBM are mixed together weak supramolecular interactions, the resulting materials exhibit microphase separated morphologies of electron-donor electron-acceptor rich domains. properties blend, used in photovoltaic devices as active layers, also discussed. Detailed facts importance to specialist readers published...
The increased incorporation of silver nanoparticles (Ag NPs) into consumer products makes the characterization potential risk for humans and other organisms essential. oral route is an important uptake NPs, therefore study gastrointestinal tract in respect to NP toxicity very timely. aim present was evaluate effects Ag NPs ions on a Caco-2/TC7:HT29-MTX intestinal co-culture model with mucus secretion, which constitutes protective barrier exogenous agents vivo may strongly influence particle...
The potential toxic effects of two types copper(II) oxide (CuO) nanoparticles (NPs) with different specific surface areas, shapes (rod or spheric), sizes as raw materials and similar hydrodynamic diameter in suspension were studied on human hepatocarcinoma HepG2 cells. Both CuO NPs shown to be able enter into cells induce cellular toxicity by generating reactive oxygen species. increased the abundance several transcripts coding for pro-inflammatory interleukins chemokines. Transcriptomic...
Interactions between nanoparticles and cells are now the focus of a fast-growing area research. Though many interact with without any acute toxic responses, metal oxide including those composed titanium dioxide (TiO2-NPs) may disrupt intracellular process macroautophagy. Autophagy plays key role in human health disease, particularly cancer neurodegenerative diseases. We herein investigated vitro biological effects TiO2-NPs (18 nm) on autophagy keratinocytes (HaCaT) at non-cytotoxic levels....
Hydroxyapatite (Ca10(PO4)6(OH)2, HAP), both as a synthetic material and constituent of bone char, can serve an effective relatively inexpensive filter for fluoride (F–) removal from drinking water in low-income countries. Fluoride uptake on HAP occur through different mechanisms, which are, principle, influenced by solution composition. Suspensions (2 g L–1) were equilibrated under controlled pH conditions (pH 6.5, 7.3, 9.5) at 25 °C 28 d after the addition F– concentrations (0.5–7.0 mM)....
Secondary ion mass spectrometry (SIMS) constitutes an extremely sensitive technique for imaging surfaces in 2D and 3D. Apart from its excellent sensitivity high lateral resolution (50 nm on state-of-the-art SIMS instruments), advantages of include dynamic range the ability to differentiate between isotopes. This paper first reviews underlying principles as well performance applications 3D elemental imaging. The prospects further improving capabilities are discussed. when using microprobe...
The helium ion microscope (HIM) has emerged as an instrument of choice for patterning, imaging and, more recently, analytics at the nanoscale. Here, we review secondary electron on HIM and various methodologies hardware components that have been developed to confer analytical capabilities HIM. Secondary electron–based can be performed resolutions down 0.5 nm with high contrast, depth field, directly insulating samples. Analytical methods include hyperspectral (SEHI), scanning transmission...
Perovskite solar modules (PSMs) show outstanding power conversion efficiencies (PCEs), but long-term operational stability remains problematic. We that incorporating N,N -dimethylmethyleneiminium chloride into the perovskite precursor solution formed dimethylammonium cation and previously unobserved methyl tetrahydrotriazinium ([MTTZ] + ) effectively improved film. The in situ formation of [MTTZ] increased energy iodine vacancies enhanced migration barrier iodide cesium ions, which...
Correlative microscopy combining various imaging modalities offers powerful insights into obtaining a comprehensive understanding of physical, chemical, and biological phenomena. In this article, we investigate two approaches for image fusion in the context inherently lower-resolution chemical images obtained using secondary ion mass spectrometry (SIMS) with high-resolution ultrastructural electron (EM). We evaluate methods three different case studies selected to broadly represent typical...
Perfluorooctanoic acid (PFOA) is a synthetic perfluorinated chemical classified as persistent organic pollutant. PFOA has been linked to many toxic effects, including liver injury. Many studies report that exposure alters serum and hepatic lipid metabolism. However, lipidomic pathways altered by are largely unknown only few classes, mostly triacylglycerol (TG), usually considered in analysis. Here, we performed global analysis on the of PFOA-exposed (high-dose short-duration) control mice...
Compositional engineering of organic-inorganic metal halide perovskite allows for improved optoelectrical properties, however, phase segregation occurs during crystal nucleation and limits solar cell device performance. Herein, we show that by applying tetrabutylammonium bistriflimide as an additive in the precursor solution, ultra-uniform crystals are obtained, which effectively increases As a result, power conversion efficiencies (PCEs) 24.5% 21.2% module achieved, together with high...
This study aims to assess the effects of Ag particles synthesised by a chemical (Ag 20, 200 nm) and biological method 23, 27 in aquatic organisms: bacterium Vibrio fischeri, alga Desmodesmus subspicatus crustacean Daphnia magna. exerted toxic all organisms studied with 23 nm being most potent. Although soluble was released media, differences between tested still cannot be explained solely based on Ag. NanoSIMS analysis performed D. magna showed that apart from their localisation gut lumen,...
Neuromelanin (NM) is a compound which highly accumulates mainly in catecholamine neurons of the substantia nigra (SN), and contained organelles (NM-containing organelles) with lipid bodies proteins. These selectively degenerate Parkinson's disease NM can play either protective or toxic role. NM-containing SN were investigated by Analytical Electron Microscopy (AEM) Nano-Secondary Ion Mass Spectrometry (NanoSIMS) within human tissue sections respect to ultrastructure elemental composition....
Titanium dioxide (TiO2) is commonly used as a food additive (E171 in the EU) for its whitening and opacifying properties. However, risk of intestinal barrier disruption, including dysbiosis gut microbiota, increasingly suspected because presence nano-sized fraction this additive. We hypothesized that food-grade E171 Aeroxyde P25 (identical to NM-105 OECD reference nanomaterial European Union Joint Research Centre) interact with both commensal bacteria transient food-borne under...
The present study aimed to evaluate the potential differences in biological effects of two types spherical silver particles 20 and 200 nm (Ag20 Ag200), PVP-coated nanowires (AgNWs) with a diameter 50 length up μm, using complex 3D model representative for alveolar barrier cultured at air-liquid interface (ALI). was exposed 0.05, 0.5 5 μg/cm2 test compounds ALI state-of-the-art exposure system (Vitrocell™Cloud System). Endpoints related oxidative stress induction, anti-oxidant defence...
Improved charge extraction in carbon-based fully printable hole transport layer-free mesoscopic perovskite solar cells with excellent long-term stability.