Entries by Katy

Near-infrared-excited upconversion photodynamic therapy of extensively drug-resistant Acinetobacter baumannii based on lanthanide nanoparticles

Extensively drug-resistant Acinetobacter baumannii (XDR-AB) has raised considerable concerns due to its mortal damage to humans and its high transmission rate of infections in hospitals. However, current antibiotics not only show poor anti-infection effects in vivo but also frequently cause high nephrotoxicity and neurotoxicity. Herein, we report a near-infrared (NIR) light-initiated antimicrobial photodynamic therapy (aPDT) […]

Multiplexed intracellular detection based on dual-excitation/dual-emission upconversion nanoprobes

Multiplexed intracellular detection is desirable in biomedical sciences for its higher efficiency and accuracy compared to the single-analyte detection. However, it is very challenging to construct nanoprobes that possess multiple fluorescent signals to recognize the different intracellular species synchronously. Herein, we proposed a novel dual-excitation/dual-emission upconversion strategy for multiplexed detection through the design of upconversion […]

Investigation of excitation interference in laser-induced breakdown spectroscopy assisted with laser-induced fluorescence for chromium determination in low-alloy …

Chromium determination in steels suffered from excitation interference in laser-induced breakdown spectroscopy assisted with laser-induced fluorescence (LIBS-LIF). In this work, excitation interference between target chromium atoms and matrix iron atoms was investigated in detail. Relative absorption strength (RAS) of chromium and iron was mathematically deduced and utilized to estimate the excitation interference theoretically. Standard calibration […]

Temperature Dependence of Singlet Oxygen Generation for Different Photosensitizers

The temperature dependences of the lifetimes and the efficiencies of singlet oxygen generation has been recorded for a set of compounds (e.g., porphyrins, metalloporphyrins, porphycene, perrylene, and terrylene). Based on the behavior of the above mentioned temperature dependences, the chance of creation of oxygen complexes with metalloporphyrins and porphycene in the ground electronic state in […]

Samarium-doping concentration influence on spectroscopic parameters of Sm: YAG crystal

The main goal of this work was to characterize the spectroscopic properties (absorption, fluorescence, and lifetime) of the samarium ion in the yttrium-aluminum-garnet matrix. The Sm:YAG crystals with various samarium concentrations (1, 3, 6.4, 10, and 20 at.% Sm/Y in the melt) were produced by the edge-defined, film-fed growth technique. Absorption characteristics were investigated in […]

Growth and spectroscopic properties of Yb0. 1Gd1. 8La0· 1SiO5 crystal: A promising new laser material for ultrashort laser

Recently, in the field of femtosecond lasers, an intense interest has been aroused for Yb3+-doped laser crystals which are able to be pumped directly by semiconductor laser. In this work, a novel Yb3+-doped mixed laser crystal Yb0.1Gd1.8La0·1SiO5 (Yb:GLSO) crystal with high-quality was grown successfully by Czochralski method. Raman spectrum confirmed that the Yb:GLSO has highly disordered […]

Instrumental improvements for the trace analysis of structural isomers of polycyclic aromatic hydrocarbons with molecular mass 302 Da

Polycyclic aromatic hydrocarbons (PAHs) are some of the most common environmental pollutants encountered worldwide. Eco-toxicological studies attribute a significant portion of the biological activity of PAH contaminated samples to the presence of high molecular weight PAHs (HMW-PAHs), i.e. PAHs with molecular mass (MM) greater than 300 Da. The research presented here focuses on the analysis of […]

Ti3C2 MXene Photoexciting Nanoflakes for Localization of Supercontinuum Lasing of Aqueous Phase Quantum Dots

Materials with excellent absorption performance of electromagnetic waves can efficiently transform electromagnetic energy to heat energy and are suitable for modern applications, including the bolometer and electromagnetic interference (EMI) shields with minimal thickness. In recent years, two-dimensional (2D) transition metal carbides (MXenes) were identified as efficient electromagnetic wave absorbers that could provide opportunities for constructing […]

Synthesis of multi-color luminescent ZnO nanoparticles by ultra-short pulsed laser ablation

Crystalline ZnO nanoparticles (NPs) are synthesized by ultra-short femtosecond (fs) pulsed laser ablation (PLA) of a zinc plate in deionized water, and are investigated by optical absorption and time resolved luminescence spectra in combination with the morphology and structure analysis. The comparison with previous experiments based on short nanosecond (ns) PLA highlights that pulse duration […]

Matrix isolation studies of vibrational structure of hemiporphycene

Parent, unsubstituted free base hemiporphycene, a constitutional isomer of porphyrin, was synthesized only a few years ago, and the detailed characterization of vibrational structure is lacking. We studied vibrations of hemiporphycene using site-selected fluorescence and IR measurements in low temperature argon and nitrogen matrices, combined with recording Raman spectra of polycrystalline samples. Temperature dependence of […]