A5076688417- Perovskite Materials and Applications
- Solid-state spectroscopy and crystallography
- Gas Sensing Nanomaterials and Sensors
- Catalytic Processes in Materials Science
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- ZnO doping and properties
- Nanocluster Synthesis and Applications
- Polymer Nanocomposite Synthesis and Irradiation
- Analytical Chemistry and Sensors
- Nuclear materials and radiation effects
- Optical properties and cooling technologies in crystalline materials
- Graphene research and applications
- Nuclear Materials and Properties
- Carbon Nanotubes in Composites
- Radioactive element chemistry and processing
- Atmospheric chemistry and aerosols
- 2D Materials and Applications
- Nanomaterials for catalytic reactions
- Copper-based nanomaterials and applications
University of Notre Dame
2018-2022
Notre Dame of Dadiangas University
2018
Ligands are the quintessential synthesis tool in preparation of colloidal metal catalysts, allowing for rational design nanostructured surfaces with high activity and selectivity. These same agents can, however, strongly influence catalytic performance nanostructures aqueous media. In this regard, current literature describing ligands on model reaction that sees 4-nitrophenol reduced to 4-aminophenol by borohydride is highly fragmented understanding rate, induction time, ligand desorption...
Polymers with superior mechanical properties are desirable in many applications. In this work, polyethylene (PE) films reinforced exfoliated thermally reduced graphene oxide (TrGO) fabricated using a roll-to-roll hot-drawing process shown to have outstanding properties. The specific ultimate tensile strength and Young's modulus of PE/TrGO increased monotonically the drawing ratio TrGO filler fraction, reaching up 3.2 ± 0.5 109.3 12.7 GPa, respectively, 60× very low weight fraction 1%. These...
One intriguing aspect of mixed halide lead perovskites (e.g., CH3NH3PbBrxI3–x) is ion segregation when subjected to visible illumination, but this gives rise the concerns regarding influence movement on long–term stability and applications. Here, impact light illumination hybrid perovskite films was investigated by exposing such continuous wavelength laser (25 mW/cm2). It turns out that under segregated iodide-rich species further decompose ultimately form metallic (Pb0). The chemical...
The influence of high-energy (1.6 MeV) Ar2+ irradiation on the interfacial interaction between cerium oxide thin films (∼15 nm) with a SiO2/Si substrate is investigated using transmission electron microscopy, ultrahigh vacuum x-ray photoelectron spectroscopy (XPS), and carbon monoxide (CO) oxidation catalytic reaction ambient pressure XPS. combination these methods allows probing dynamics vacancy generation its relation to chemical interactions at CeO2/SiO2/Si interface. results suggest that...
We report an investigation of lead halide perovskite CH3NH3PbBr3 nanocrystals and associated ligand molecules by combining several different state-of-the-art experimental techniques, including synchrotron radiation-based XPS VUV PES free-standing isolated in vacuum. By using this novel approach for materials, we could directly obtain complete band alignment to vacuum both the ligands widely used their preparation. discuss possible influence apparent properties, compare electronic properties...
We report on the aerosol generation of ligand-free silver iodobismuthate (Ag-Bi-I) nanoparticles (NPs) and in situ investigation their electronic structure using synchrotron radiation soft X-ray photoelectron spectroscopy (XAPS). The structural morphological characterizations revealed to be composed spherical rudorffite Ag3BiI6 particles, approximately 100 nm size. XAPS showed well-resolved signals from all expected elements (Ag, Bi, I) allowed estimation NP work function about 4.5 eV....
The optical and structural properties of hybrid perovskites can be tuned by the post-synthetic introduction new cations. To advance development this approach, knowledge reaction mechanism is essential, but has not yet been elucidated. Here, effect n-octylamine on three-dimensional (3D) methylammonium lead bromide (MAPbBr3) was investigated in situ X-ray photoelectron spectroscopy. Spectroscopic analysis indicated equimolar substitutions between octylammonium (OcA+) (MA+) cations that cause...
Silver–bismuth iodide (Ag–Bi–I) rudorffites are chemically stable and non-toxic materials that can act as a possible lead-free replacement for methylammonium lead halides in optoelectronic applications. We report on simple route fabricating Ag–Bi–I colloidal nanoplatelets approximately 160 nm lateral dimensions 1–8 thickness via exfoliation of rudorffite powders acetonitrile. The valence band electronic structure isolated was investigated using synchrotron radiation to perform X-ray aerosol...
A systematic study of low temperature (LT) annealing III1-xMnxV (Ga1-xMnxAs and Ga1-xMnxAs1-yPy) thin films in situ with different capping layers (Se, Te, or As) was carried out without exposure to the atmosphere. Experimental results show that a correct approach can lead significant increases Curie temperature, carrier concentration, magnetic moment, similar ex LT-annealing experiments achieved earlier studies. Moreover, this allowed us successfully deposit high-quality semiconductor on top...