A5065325168- Quantum Dots Synthesis And Properties
- Perovskite Materials and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Photocatalysis Techniques
- Chalcogenide Semiconductor Thin Films
- Solid-state spectroscopy and crystallography
- Copper-based nanomaterials and applications
- Nanocluster Synthesis and Applications
- TiO2 Photocatalysis and Solar Cells
- Nanoplatforms for cancer theranostics
- Advanced biosensing and bioanalysis techniques
- Spectroscopy Techniques in Biomedical and Chemical Research
- Plasmonic and Surface Plasmon Research
- Luminescence Properties of Advanced Materials
- Electrocatalysts for Energy Conversion
- Iron oxide chemistry and applications
- Gas Sensing Nanomaterials and Sensors
- 2D Materials and Applications
- Nanoparticle-Based Drug Delivery
- ZnO doping and properties
- Laser-Ablation Synthesis of Nanoparticles
- Organic Light-Emitting Diodes Research
- Carbon and Quantum Dots Applications
- Luminescence and Fluorescent Materials
- Conducting polymers and applications
University of California, Santa Cruz
2016-2025
University of California System
2005-2025
Second People’s Hospital of Yibin
2025
Southern University of Science and Technology
2025
Hubei Normal University
2025
Jilin University
2023-2024
Xi'an Jiaotong University
2024
Western University
2024
Hebei University of Engineering
2024
Mudanjiang Medical University
2024
We report the first demonstration of hydrogen treatment as a simple and effective strategy to fundamentally improve performance TiO2 nanowires for photoelectrochemical (PEC) water splitting. Hydrogen-treated rutile (H:TiO2) were prepared by annealing pristine in atmosphere at various temperatures range 200–550 °C. In comparison nanowires, H:TiO2 samples show substantially enhanced photocurrent entire potential window. More importantly, have exceptionally low saturation potentials −0.6 V vs...
We report the rational synthesis of nitrogen-doped zinc oxide (ZnO:N) nanowire arrays, and their implementation as photoanodes in photoelectrochemical (PEC) cells for hydrogen generation from water splitting. Dense vertically aligned ZnO nanowires were first prepared a hydrothermal method, followed by annealing ammonia to incorporate N dopant. Nanowires with controlled concentration (atomic ratio Zn) up ∼4% varying time. X-ray photoelectron spectroscopy studies confirm substitution at O...
Metal-halide perovskites have rapidly emerged as one of the most promising materials 21st century, with many exciting properties and great potential for a broad range applications, from photovoltaics to optoelectronics photocatalysis. The ease which metal-halide can be synthesized in form brightly luminescent colloidal nanocrystals, well their tunable intriguing optical electronic properties, has attracted researchers different disciplines science technology. In last few years, there been...
We report on the synthesis and characterization of Sn-doped hematite nanowires nanocorals as well their implementation photoanodes for photoelectrochemical water splitting. The were prepared a fluorine-doped tin oxide (FTO) substrate by hydrothermal method, followed high temperature sintering in air to incorporate Sn, diffused from FTO substrate, dopant. same adding tin(IV) chloride Sn precursor. X-ray photoelectron spectroscopy analysis confirms Sn4+ substitution at Fe3+ sites hematite,...
Here we demonstrate that the photoactivity of Au-decorated TiO2 electrodes for photoelectrochemical water oxidation can be effectively enhanced in entire UV-visible region from 300 to 800 nm by manipulating shape decorated Au nanostructures. The samples were prepared carefully depositing nanoparticles (NPs), nanorods (NRs), and a mixture NPs NRs on surface nanowire arrays. As compared with bare TiO2, NP-decorated exhibited significantly both UV visible regions. For NR-decorated electrodes,...
Here we report that photostability and photoactivity of WO3 for water oxidation can be simultaneously enhanced by controlled introduction oxygen vacancies into in hydrogen atmosphere at elevated temperatures. In comparison to pristine WO3, the hydrogen-treated nanoflakes show an order magnitude photocurrent, more importantly, exhibit extraordinary stability without loss least seven hours. The is attributed formation substoichiometric WO3−x after treatment, which highly resistive re-oxidation...
This work reports a facile method for preparing highly photoactive α-Fe(2)O(3) films as well their implementation photoanodes water oxidation. Transparent were prepared by new deposition-annealing (DA) process using nontoxic iron(III) chloride the Fe precursor, followed annealing at 550 °C in air. Ti-doped same method, with titanium butoxide added Ti precursor. Impedance measurements show that Ti-dopant serves an electron donor and increases density 2 orders of magnitude. The...
We report on the synthesis of semiconductor nanocrystals PbS, ZnS, CdS, and MnS through a facile inexpensive synthetic process. Metal-oleylamine complexes, which were obtained from reaction metal chloride oleylamine, mixed with sulfur. The mixture was heated under appropriate experimental conditions to produce sulfide nanocrystals. Uniform cube-shaped PbS particle sizes 6, 8, 9, 13 nm synthesized. size controlled by changing relative amount PbCl(2) 11 sized spherical ZnS synthesized zinc...
We report the design and characterization of a novel double-sided CdS CdSe quantum dot cosensitized ZnO nanowire arrayed photoanode for photoelectrochemical (PEC) hydrogen generation. The represents simple analogue tandem cell structure, in which dense arrays were grown on an indium−tin oxide substrate followed by respective sensitization dots each side. As-fabricated exhibited strong absorption nearly entire visible spectrum up to 650 nm, with high incident-photon-to-current-conversion...
A photoelectrochemical cell utilizing flavonoid anthocyanin dyes extracted from blackberries, along with colloidal TiO2 powder, is shown to convert sunlight electrical power at an efficiency of 0.56% under full sun. Fluorescence quenching observed for the excited state TiO2-adsorbed dye, cyanin, and photocurrent spectrum correlates well optical absorption cyanin-sensitized nanocrystalline film. The incident photon-to-current 19% peak visible band open-circuit voltages 0.5−0.4 V,...
As one of the most prevalent metal oxides on Earth, iron oxide, especially α-Fe2O3 or hematite, has been subject intense research for several decades. In particular, combination a relatively small bandgap and related visible light absorption, natural abundance, low cost, stability under deleterious chemical conditions made it ideal many potential applications. However, short charge carrier lifetime diffusion length limited its applicability. Nanostructures hematite offer possibility...
The ultrafast dynamics of photoexcited electrons in the semiconductor iron oxides, γ-Fe2O3 and α-Fe2O3, have been measured using femtosecond laser spectroscopy. Transmission electron microscopy shows particles are spherical, with 1−2 nm average diameter, α-Fe2O3 spindle-shaped, dimensions 1 × 5 nm. Static electronic absorption measurements colloids suggest that they may be quantum confined regime. Steady-state emission show <400 direct transitions moderately emissive, but indirect visible do...
Nearly monodisperse hollow gold nanospheres (HGNs) with tunable interior and exterior diameters have been synthesized by sacrificial galvanic replacement of cobalt nanoparticles. It is possible to tune the peak surface plasmon band absorption between 550 820 nm carefully controlling particle size wall thickness. Cobalt simultaneously changing concentration sodium borohydride citrate, reducing capping agent, respectively. The thickness shell can be varied addition salt. With successful...
Different approaches to improving photoelectrochemical performance through α-Fe<sub>2</sub>O<sub>3</sub> heterostructure design.
We report the synthesis and photoelectrochemical (PEC) studies of TiO2 nanoparticles nanowires simultaneously doped with nitrogen sensitized CdSe quantum dots (QDs). These novel nanocomposite structures have been applied successfully as photoanodes for PEC hydrogen generation using Na2S Na2SO3 sacrificial reagents. observe significant enhanced photoresponse in these nanocomposites compared to N-doped or QD TiO2. The enhancement is attributed synergistic effect sensitization N-doping that...
Abstract Photoelectrochemical cells based on traditional and nanostructured ZnO thin films are investigated for hydrogen generation from water splitting. The fabricated using three different deposition geometries: normal pulsed laser deposition, oblique‐angle electron‐beam glancing‐angle deposition. characterized by scanning electron microscopy, X‐ray diffraction, UV‐vis spectroscopy photoelectrochemical techniques. Normal produces dense with ca. 200 nm grain sizes, while nanoplatelets a...
A new and simple method has been developed to synthesize large quantities of highly monodisperse tetragonal zirconia nanocrystals. In this synthesis, a nonhydrolytic sol−gel reaction between zirconium(IV) isopropoxide chloride at 340 °C generated 4 nm sized nanoparticles. high-resolution transmission electron microscopic (HRTEM) image showed that the particles have uniform particle size distribution they are crystalline. These nanoparticles were synthesized without any selection process....
Dense and aligned TiO2 nanorod arrays are fabricated using oblique-angle deposition on indium tin oxide (ITO) conducting substrates. The nanorods measured to be 800-1100 nm in length 45-400 width with an anatase crystal phase. Coverage of the ITO is extremely high 25 x 10(6) mm(-2) nanorods. first use these dense as working electrodes photoelectrochemical (PEC) cells used for generation hydrogen by water splitting demonstrated. A number experimental techniques including UV/Vis absorption...
Abstract Laser-induced phototherapy is a new therapeutic use of electromagnetic radiation for cancer treatment. The targeted plasmonic gold nanoparticles can reduce the laser energy necessary selective tumor cell destruction. However, ability delivery currently used to cells limited. Here, we describe class molecular specific photothermal coupling agents based on hollow nanoshells (HAuNS; average diameter, ∼30 nm) covalently attached monoclonal antibody directed at epidermal growth factor...
Live wire: Thermal decomposition of β-FeOOH nanowires at 550 °C in an oxygen-deficient atmosphere generates highly photoactive hematite (N-hematite), which yielded a substantially enhanced photocurrent density, as compared to sample prepared air (A-hematite). This photoactivity is attributed the improved donor density nanowires, result formation oxygen vacancies.
Abstract Purpose: To develop melanoma-targeted hollow gold nanospheres (HAuNS) and evaluate their potential utility for selective photothermal ablation in melanoma. Experimental Design: A new class of coupling agents based on HAuNS was synthesized. were stabilized with polyethylene glycol (PEG) coating attached α–melanocyte-stimulating hormone (MSH) analog, [Nle4,D-Phe7]α-MSH (NDP-MSH), which is a potent agonist melanocortin type-1 receptor overexpressed The intracellular uptake the...
Poly(acrylic acid) grafted mesoporous silica nanoparticles (PAA-MSNs) were prepared by a facile graft-onto strategy, i.e., the amidation between PAA homopolymer and amino group functionalized MSNs. The resultant PAA-MSNs uniform spherical with mean diameter of approximately 150 nm, graft amount evaluated thermogravimetric analysis (TGA) was about 12 wt %. Due to covalent hydrophilic pH-responsive PAA, could be well dispersed in aqueous solution, which is favorable utilized as drug carriers...