A graphene-based toxic detection approach

Memories - Materials Devices Circuits and Systems, Journal Year: 2025, Volume and Issue: unknown, P. 100127 - 100127

Published: Feb. 1, 2025

Language: Английский

Interface-Tailored Secondary Excitation and Ultrafast Charge/Energy Transfer in Ti₃C₂T_x-MoS₂ Heterostructure Films

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: March 7, 2025

Charge/energy separation across interfaces of plasmonic materials is vital for minimizing losses and enhancing their performance in photochemical optoelectronic applications. While heterostructures combining two-dimensional transition metal carbides/nitrides (MXenes) semiconducting dichalcogenides (TMDs) hold significant potential, the mechanisms governing plasmon-induced carrier dynamics at these remain elusive. Here, we uncover a distinctive secondary excitation phenomenon an ultrafast charge/energy transfer process heterostructure films composed macro-scale Ti3C2Tx MoS2 films. Using Rayleigh–Bénard convection Marangoni effect-induced self-assembly, fabricate large-scale (square centimeters) edge-connected monolayer nanoflakes. These are flexibly stacked controlled sequence to form macroscopic heterostructures, enabling investigation manipulation excited-state using transient absorption optical pump-terahertz probe spectroscopy. In Ti3C2Tx-MoS2 heterostructure, observe driven by surface plasmon resonance Ti3C2Tx. This phenomenon, with characteristic rise time constant ∼70 ps, likely facilitated acoustic phonon recycling interface. Further interfacial thermal transport engineering─achieved tailoring combination trilayer heterostructures─allows extending ∼175 ps. Furthermore, identify sub-150 fs from MoS2. The efficiency strongly dependent on photon energy, resulting amplified photoconductivity up ∼180% under 3.10 eV excitation. insights crucial developing MXene-based paving way advancements

Language: Английский

From Pollutant Removal to Renewable Energy: MoS2-Enhanced P25-Graphene Photocatalysts for Malathion Degradation and H2 Evolution

Materials, Journal Year: 2025, Volume and Issue: 18(11), P. 2602 - 2602

Published: June 3, 2025

The widespread presence of pesticides—especially malathion—in aquatic environments presents a major obstacle to conventional remediation strategies, while the ongoing global energy crisis underscores urgency developing renewable sources such as hydrogen. In this context, photocatalytic water splitting emerges promising approach, though its practical application remains limited by poor charge carrier dynamics and insufficient visible-light utilization. Herein, we report design evaluation series TiO2-based ternary nanocomposites comprising commercial P25 TiO2, reduced graphene oxide (rGO), molybdenum disulfide (MoS2), with MoS2 loadings ranging from 1% 10% weight. photocatalysts were fabricated via two-step method: hydrothermal integration rGO into followed solution-phase self-assembly exfoliated nanosheets. composites systematically characterized using X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectroscopy. Photocatalytic activity was assessed through two key applications: degradation malathion (20 mg/L) under simulated solar irradiation hydrogen evolution in sacrificial agents. Quantification performed gas chromatography–mass spectrometry (GC-MS), thermal conductivity detection (GC-TCD). Results showed that significantly enhanced surface area mobility, served an effective co-catalyst, promoting interfacial separation acting active site for evolution. Nearly complete (~100%) achieved within hours, production reached up 6000 µmol g−1 h−1 optimal loading. Notably, performance declined higher content due recombination effects. Overall, work demonstrates synergistic enhancement provided stable P25-based system viability addressing both environmental sustainable conversion challenges.

Language: Английский