Le Trong Lu

Fe doping induces a synergistic enhancement of electronic conductivity and electrocatalytic activity in Gd ₂ O ₃ nanoparticles, enabling highly sensitive electrochemical detection of chloramphenicol in real pharmaceutical and milk samples.

Ultrasmall bismuth oxide nanoparticles (Bi2O3 NP) are emerging as promising CT contrast agents owing to their high atomic number, strong X-ray attenuation, and versatile surface chemistry. Herein, we report a facile one-pot polyol synthesis of Bi2O3 NPs using triethylene glycol and polyacrylic acid (PAA), which acts as both surfactant and biocompatible coating. The obtained Bi2O3@PAA NPs exhibit an average core size of ~4.4 nm, uniform dispersion, and excellent aqueous stability. Their structural and surface characteristics were comprehensively confirmed by TEM, XRD, DLS, FTIR and TGA analyses. In vitro CT imaging experiments demonstrated that Bi2O3@PAA NPs produced a linear and concentration-dependent enhancement in Hounsfield units (HU), achieving an X-ray attenuation efficiency significantly higher than that of the commercial iodine-based contrast agent iobitridol under identical conditions. These findings highlight the potential of ultrasmall Bi2O3@PAA NPs as next-generation CT contrast agents.

Bi ₂ O ₃ /Gd ₂ O ₃ @PEI composite nanoparticles synthesized via a simple one-pot method exhibit high stability, biocompatibility, and outstanding dual-modal CT/MRI imaging performance.

A humidity-resistant, antibacterial triboelectric nanogenerator (TENG) was developed using polyhexamethylene guanidine hydrochloride (PHMG) as the primary functional material. To enhance performance stability, PHMG was integrated with natural chitosan (CS) to create a positively charged triboelectric electrode. When combined with a negatively charged fluorinated ethylene propylene (FEP) membrane, the TENG demonstrated outstanding electrical output, achieving a maximum peak-to-peak voltage (V_p–p) of 1470.6 V and a peak power (P_peak) of 12 mW at a 10 MΩ load under 40% relative humidity. Notably, the device maintained stable operation in high-humidity conditions (up to 90% HR), with a sustained V_p–p of 862.7 V and a P_peak of 6.5 mW. In addition to its energy-harvesting capability, the TENG exhibited strong antibacterial activity as it effectively eliminated E. coli (at a concentration of 1.7 × 10⁴) and S. aureus (at a concentration of 1.6 × 10⁴) bacteria within just 60 seconds at 90% relative humidity. This combination of reliable triboelectric generation in humid environments and rapid antibacterial activity indicates the potential of this TENG for self-powered applications in wearable electronics and hygienic surfaces, including smart face masks and antibacterial shoe insoles.

Ultrasmall Bi/Bi₂O₃ NPs with high Bi content were successfully synthesized via a simple one-pot method, exhibiting excellent CT imaging performance.

In this study, Buckypaper (BP) is fabricated by vacuum filtering method, used as a current collector for supercapacitors (SC). This BP is then directly printed with rGO-CuS hybrid nanomaterial ink onto its surface via a custom 3D printer. The structure of material components is characterized using transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM). Also, electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) analyses are conducted to estimate the electrochemical performance. The results show that the fabricated SC electrode is of good quality with a specific capacitance of 680.9 F/g at a scan rate of 5 mV/s. Besides, the electrode also has characteristic redox peaks and a stability of 94.3 % after 6000 discharges at a current density of 25 A/g.

This paper aims to present the fabrication of a Li-ion supercapattery by an anode designed for a lithium-ion battery (nanotube TiO2 (NT-TiO2) and carbon nanotubes (CNTs), namely as NT-TiO2/CNTs) with a cathode designed for an electrochemical double-layer capacitor (derived activated carbon), resulting in high energy and densities of power. The hydro¬thermal route formed the composite NT-TiO2/CNTs. DFT calculations provide the Li absor¬bed inside and outside isolated CNTs and NT-TiO2/CNTs. The lithium diffusion energy barrier results show that Li is preferred energetically inside CNT. The energy barrier of Li diffusion for isolated CNTs is 1.21 eV, whereas that of NT-TiO2/CNTs is computed at 0.69 eV. It demonstrated that the functionalized NT-TiO2 improves the performance and the rate of Li diffusion of the isolated CNTs system, which agrees with the experiment. The results illustrate that the synergistic effect of high conductive CNT networks and well-dispersed NT-TiO2 structure can enhance hybrid capacitors' power and energy density through the brief diffusion routes for Li-ions and rapid transference of electrons. A Li-ion supercapattery battery, NT-TiO2/CNTs-1||activated carbon (AC), achieved an energy density of 48.9 Wh kg-1, surpassing supercapacitors, and a power density of 1667 W kg-1 at a current rate of 1 A g-1, exceeding that of Li-ion batteries.

A novel, cost-effective magnetic Fe₃O₄@CS@PHMG nanocomposite synthesized from spent pickling liquors and coated with chitosan and polyhexamethylene guanidine hydrochloride via TPP crosslinking demonstrated exceptional antibacterial performance.

Gd₂O₃/Fe₃O₄ composite nanoparticles with a unique structure were successfully synthesized using a simple and effective approach, exhibiting superior T₁–T₂ dual-modality MRI performance.

In this study, we report the successful fabrication of a novel antibacterial triboelectric nanogenerator (TENG) using a polymer composite film based on polyhexamethylene guanidine hydrochloride (PHMG). The composite materials, with optimised ingredient ratios, consist of PHMG, polyvinyl alcohol (PVA) and glutaraldehyde (GA) as a crosslinking agent (PHMG-GA-PVA). Utilising 3D printing, these composite materials were directly deposited on the conductive substrates and used as positive TENG electrodes. The obtained results show that the TENGs based on PHMG-GA-PVA exhibit high output efficiency, achieving peak-to-peak open-circuit voltage (V_p–p) and short-circuit current (I_SC) values of 664.5 V and 116.8 μA, respectively, at a low operating frequency of 1 Hz with an actuation force of 10 N. The device retains approximately 98% of its initial output voltage value after 360 000 contact-release cycles.