A5040353304- Quantum Dots Synthesis And Properties
- Supercapacitor Materials and Fabrication
- Vibration Control and Rheological Fluids
- Dielectric materials and actuators
- ZnO doping and properties
- Chalcogenide Semiconductor Thin Films
- Transition Metal Oxide Nanomaterials
- Conducting polymers and applications
- Pigment Synthesis and Properties
- Gas Sensing Nanomaterials and Sensors
- Advancements in Battery Materials
- Polymer Nanocomposites and Properties
- Advanced Sensor and Energy Harvesting Materials
- Perovskite Materials and Applications
- TiO2 Photocatalysis and Solar Cells
- Copper-based nanomaterials and applications
- Polymer composites and self-healing
- Catalytic Processes in Materials Science
- Advanced Semiconductor Detectors and Materials
- Fuel Cells and Related Materials
- Seismic Performance and Analysis
- Semiconductor Lasers and Optical Devices
- Strong Light-Matter Interactions
- Electrochemical Analysis and Applications
- Graphene research and applications
The University of Texas at Austin
2019-2025
Los Alamos National Laboratory
2024-2025
Hongik University
2025
Seoul National University
2016-2017
Electrochemical conditioning via chronopotentiometry (CP) and cyclic voltammetry (CV) is essential for the activation of oxygen evolution reaction (OER) electrocatalysts. While many reports have activated OER electrocatalysts using either CP or CV, inherent differences between these two electrochemical methods electrocatalytic materials yet to be explored. Here, we investigate effects CV on a Ni-based precatalyst substrate in Fe-purified Fe-unpurified KOH electrolytes by employing (i) Ni...
Polyaniline-capped mesoporous carbon nanosheets with high conductivity and porosity are synthesized by vapor deposition polymerization. The template is prepared removing ordered cubic iron oxide nanocrystals embedded in the matrix obtained thermal decomposition of an iron-oleate complex a sodium chloride matrix. evaporated aniline monomers slowly polymerized on surface pretreated FeCl
Plate-type hollow black TiO2 (HL/BT) with a high NIR reflectance was fabricated for the first time as LiDAR-detectable material. A layer formed on commercial-grade glass by using sol–gel method to obtain plate-type structure. The template then etched hydrofluoric acid form structure, and blackness further achieved through NaBH4 reduction, which altered oxidation state of TixO2x–1 or Ti4+ Ti3+ Ti2+. HL/BT material maintained novel approach that involved etching prior reduction. thickness...
Herein, unique three-dimensional (3D) hierarchically structured carbon nanofiber (CNF)/metal oxide/conducting polymer composite materials were successfully synthesized by combinations of various experimental methods. Firstly, base CNFs carbonization electrospun PAN/PVP fibers to attain electric double-layer capacitor (EDLC) characteristics. To further enhance the capacitance, tin oxide (SnO
Novel LiDAR-detectable black double-shell hollow nanoparticles (BDS-HNPs) with internal white shell are successfully utilized as materials for autonomous vehicle paint the first time. These BDS-HNPs carefully designed to achieve excellent near-infrared (NIR) reflectance, blackness, hydrophilicity, and applicability monolayer coatings. An emphasis is placed on NIR reflectance by forming morphologies embracing multiple interfaces within nanoparticles. Accordingly, exhibit of ca. 33.2, 36.9,...
The graphene oxide-coated iron oxide/silica core/shell nanoparticles (Fe3O4/SiO2/GO NPs) are successfully fabricated and adopted as the dual stimuli-responsive smart fluid. Fe3O4/SiO2/GO NPs exhibit both electrorheological (ER) magnetorheological (MR) characteristics, attributed to SiO2/GO layer in shell part Fe3O4 core part, respectively. Particularly, ER efficiency of NPs-based fluid is ca. 191 at applied electric field 3 kV mm–1. Moreover, MR performance significantly enhanced up 135-fold...
A synthetic challenge in faceted metal oxide nanocrystals (NCs) is realizing tunable localized surface plasmon resonance (LSPR) near-field response the infrared (IR). Cube-shaped nanoparticles of noble metals exhibit LSPR spectral tunability limited to visible range. Here, we describe colloidal synthesis fluorine, tin codoped indium (F,Sn:In2O3) NC cubes with IR range for around 10 nm particle sizes. Free carrier concentration tuned through controlled Sn dopant incorporation, where an...
Present-day liquid-state lasers are based on organic dyes. Here we demonstrate an alternative class of liquid that use solutions colloidal quantum dots (QDs). Previous efforts to realize such devices have been hampered by the fast non-radiative Auger recombination multicarrier states required for optical gain. overcome this challenge using type-(I + II) QDs, which feature a trion-like gain state with strongly suppressed recombination. When combined Littrow cavity, static (non-circulated)...
Germanium (Ge) colloidal quantum dots (CQDs) were synthesized by thermal decomposition of GeI
Incorporating manganese (Mn) impurities into II-VI semiconductors alters their properties through strong exchange interactions with the host material. In colloidal quantum dots (QDs), these enable ultrafast bidirectional energy transfer between magnetic impurity and QD intrinsic states, rates exceeding rate of loss via phonon emission. This suggests that Mn-QD could harness hot carrier before dissipation. Here, we demonstrate by using Mn-doped CdSe/HgSe core/shell QDs, can efficiently...
The geometric effects on electrorheological (ER) activity are successfully examined by the utilization of mesoporous silica particles with varying aspect ratios.
In this study, a 1D oriented hollow SiO<sub>2</sub>/TiO<sub>2</sub> (HST) rod-like material was successfully fabricated <italic>via</italic> sequential combination of sol–gel use, TiO<sub>2</sub> incorporation, and sonication-mediated etching redeposition method.
This communication describes 1D mesoporous silica nanoparticles that were successfully used as scaffolds to enhance the electron extraction from perovskite absorber layer working electrode.
The equilibrium phase of cesium lead iodide (CsPbI3) at room temperature is yellow and optically inactive due to its indirect band gap. metastable black CsPbI3 on the other hand exhibits optical properties that are suitable for photovoltaic light-emitting devices. Here, we examine stability ligand-stabilized nanocrystals heated in humid air. Water vapor known catalyze transition from phase. Uniform with cube shape were synthesized capping ligand mixtures oleylamine oleic acid or...
Light detection and ranging (LiDAR) sensors utilize a near-infrared (NIR) laser with wavelength of 905 nm. However, LiDAR have weakness in detecting black or dark-tone materials light-absorbing properties. In this study, SiO2/black TiO2 core/shell nanoparticles (SBT CSNs) were designed as LiDAR-detectable materials. The SBT CSNs, sizes 140, 170, 200 nm, fabricated by series Stöber, TTIP sol-gel, modified NaBH4 reduction methods. These CSNs are detectable sensor and, owing to their structure...
Hollow TiO2 nanoparticles (HNPs) capped with conducting polymers, such as polythiophene (PT), polypyrrole (PPy), and polyaniline (PANI), have been studied to be used polarizability-tunable electrorheological (ER) fluids. The hollow shape of nanoparticles, achieved by the removal SiO2 template, offers colloidal dispersion stability in silicone oil owing high number density. Conducting polymer shells, introduced on nanoparticle surface using vapor deposition polymerization method, improve...
A facile oxygen (O2) atmospheric plasma treatment is applied to a polyvinyl alcohol (PVA) matrix enhance its wettability and hydrophilicity. The optimal conditions are determined by varying the power time. PVA treated with of 120 W for 5 s shows most hydrophilicity owing successful formation carbonyl (-CO, >C=O) functional groups without any structural degradation. plasma-treated used as gel-polymer electrolyte solid-state supercapacitor (SSC) immersing solid into various liquid...
In this study, a flexible all-solid-state asymmetric supercapacitor (FASC) device has been successfully fabricated via full recycling of heated tobacco waste (HTW). Tobacco leaves and cellulose acetate tubes have carbonized (HTW-C) mixed with metal oxides (MnO2 Fe3O4) to obtain highly active materials for supercapacitors. Moreover, poly(lactic acid) (PLA) filters dissolved in an organic solvent the as-prepared using simple paste mixing method. addition, MnO2- Fe3O4-mixed HTW-C/PLA electrodes...
In this communication, an electromagnetorheological fluid containing Fe<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub>/PANI nanoparticles is reported to demonstrate its controllable rheological properties under electric and magnetic fields.
Electrophotorheological (EPR) fluids, whose rheological activity is dually responsive to light and electric fields (E fields), formulated by mixing photosensitive spiropyran-decorated silica (SP-sSiO2) nanoparticles with zwitterionic lecithin mineral oil. A reversible photorheological (PR) of the EPR fluid developed via binding releasing mechanism merocyanine (MC, a photoisomerized form SP) under ultraviolet (UV) visible (VIS) applications. Moreover, exhibits an 8-fold higher...
Surface modification of dielectric materials changes the dipole–dipole interactions under electric fields, thereby controlling electrorheological (ER) response. The introduction metal oxides onto mica templates and further coating dyes is expected to simultaneously improve color clarity ER performance. Dye-coated TiO2 platelets on are synthesized for high-performance colorful fluids. A sol–gel method utilized grow prepare precursor light-colored mica/TiO2 materials, which coated with...
The mixed geometrical effect on the electrorheological (ER) activity of bimodal ER fluids was investigated by mixing SiO2 spheres and rods different dimensions. To gain an in-depth understanding effect, 12 were prepared from 4 sizes (50, 100, 150, 350 nm) 3 types with aspect ratios (L/D = 2, 3, 5). Five concentrations created for each fluid, resulting in a total 60 sets comprehensive measurements. Some exhibited enhanced performance, as high 23.0%, compared to single rod-based reveal fluids....