Au Nanoparticles Research Articles

Quick Freezing-Induced Au Nanoparticle Aggregates (QFIAAs) for Near-IR (NIR) Surface-Enhanced Raman Scattering (SERS) Substrates

Quick Freezing-Induced Au Nanoparticle Aggregates (QFIAAs) for Near-IR (NIR) Surface-Enhanced Raman Scattering (SERS) Substrates

Synthesis and Characterization of PVC/(Co3O4/CNT)@Au Semiconductor Nanocomposite for Enhanced Medium-Voltage Cable Insulation

Abstract This study presents the synthesis, characterization, and application of a novel PVC/(Co3O4/CNT)@Au nanocomposite for enhanced medium-voltage cable insulation. The nanocomposite was developed by incorporating Co3O4 octahedron nanoparticles, carbon nanotubes (CNTs), and gold nanoparticles (Au) into a polyvinyl chloride matrix. Compared to standard PVC insulation, the nanocomposite exhibited a 3% improvement in relative permittivity (increased from 2.34 to 2.41) and significantly enhanced field uniformity, as evidenced by simulation studies. Fourier-transform infrared spectroscopy, X-ray diffraction, and electron microscopy confirmed the successful integration of nanofillers and highlighted their contributions to the composite’s properties. Optical characterization revealed a direct bandgap of 4.60 eV and an Urbach energy of 0.3674 eV, indicating a wide-bandgap semiconductor with moderate structural disorder. AC conductivity measurements demonstrated frequency-dependent behavior, while dielectric constant and loss analyses suggested the material’s potential for energy storage and insulation applications. The choice of Co3O4 and CNTs was guided by their synergistic impact on charge trapping, field grading, and thermal management, while Au nanoparticles enhanced charge transfer and local electric field distribution. These findings demonstrate the nanocomposite’s promise in addressing the limitations of traditional PVC insulation, offering improved dielectric performance, reliability, and durability for power transmission and distribution systems.

Visual detection of kanamycin with functionalized Au nanoparticles.

A simple and rapid colorimetric detection strategy, based on hydrogen bond identification of 6-thioguanine (6-TG) functionalized Au nanoparticles (AuNPs), is proposed for highly selective and sensitive determinationof kanamycin (KA). In this strategy, the hydrogen bond interaction between 6-TG and kanamycin induces AuNPs to agglomerate, with a consequent color change of AuNPs from wine red to purple or even blue. The kanamycin concentrations can be quantified by employing UV-vis spectrophotometer. The results display that kanamycin concentrations (0.005 to 18µM) are linearly related to A620/A520 (the absorbance ratio of 620nm and 520nm) with a LOD of 1.8nM and a LOQ of 5.9nM (S/N = 3). This strategy also reveals a high degree of selectivity among a series of common interfering species. Moreover, the strategy can be employed to detect trace amounts of kanamycin in real-life samples, and it shows satisfying resultscompared with high performance liquid chromatography. In general, this developed strategy is facile and inexpensive without the need for complex processing procedures and expensive instruments. In addition, this work may further exploit detection strategies for other organic contaminants, as well as make a strong contribution to the development of the colorimetric method.

Plasmon-Enhanced CO2 Reduction to Liquid Fuel via Modified UiO-66 Photocatalysts

Metal–organic frameworks (MOFs) have emerged as versatile materials with remarkably high surface areas and tunable properties, attracting significant attention for various applications. In this work, the modification of a UiO-66 MOF with metal nanoparticles (NPs) is investigated for the purpose of enhancing its photocatalytic activity for CO2 reduction to liquid fuels. Several NPs (Au, Cu, Ag, Pd, Pt, and Ni) were loaded into the UiO-66 framework and employed as photocatalysts. The synergistic effects of plasmonic resonance and MOF characteristics were investigated to improve photocatalytic performance. The synthesized materials were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS), confirming the successful integration of metal NPs onto the UiO-66 framework. Morphological analysis revealed distinct distributions and sizes of NPs on the UiO-66 surface for different metals. Photocatalytic CO2 reduction experiments demonstrated enhanced activity of plasmonic MOFs, yielding methanol and ethanol. The findings revealed by this study provide valuable insights into tailoring MOFs for improved photocatalytic applications through the incorporation of plasmonic metal nanoparticles.

Study of temperature dependences and electrical properties of thin films of Ag2S quantum dots

The results of studying the electrical properties of thin films of colloidal quantum dots (QDs), Ag2S/SiO2 and Ag2S/SiO2/Au, are interesting and important for understanding the behavior of these materials. Additional studies made it possible to determine the temperature dependences of conductivity in the range from 300 to 360 K, which made it possible to study changes in the electrical properties of materials depending on temperature. Activation energy values obtained from linear approximations of current-voltage characteristics in Arrhenius coordinates have become key to determining energy barriers and conduction mechanisms in these systems. Decorating Ag2S quantum dots with plasmonic gold nanoparticles also has the potential to improve the electrical properties of materials and create new functional characteristics. The results obtained can have a wide range of applications in the field of nanoelectronics, optoelectronics, sensors and other technologies that require precise control of the electrical properties of materials at different temperatures. Decoration of Ag2S/SiO2 QDs with plasmonic gold nanoparticles leads to an increase in the band gap from 0.29 to 0.89 eV. This effect can be explained by the interaction between gold plasmons and Ag2S/SiO2 electrons, which leads to a change in the properties of the material. It has been shown that decorating Ag2S/SiO2 QDs with Au nanoparticles leads to a change in the type of conductivity. Finally, calculating the mobility of charge carriers according to the Mott-Gurney model allows for a deeper understanding of the conductivity mechanisms in the presented thin-film structures.

Large-scale high uniform optoelectronic synapses array for artificial visual neural network

Recently, the biologically inspired intelligent artificial visual neural system has aroused enormous interest. However, there are still significant obstacles in pursuing large-scale parallel and efficient visual memory and recognition. In this study, we demonstrate a 28 × 28 synaptic devices array for the artificial visual neuromorphic system, within the size of 0.7 × 0.7 cm2, which integrates sensing, memory, and processing functions. The highly uniform floating-gate synaptic transistors array were constructed by the wafer-scale grown monolayer molybdenum disulfide with Au nanoparticles (NPs) acting as the electrons capture layers. Various synaptic plasticity behaviors have been achieved owing to the switchable electronic storage performance. The excellent optical/electrical coordination capabilities were implemented by paralleled processing both the optical and electrical signals the synaptic array of 784 devices, enabling to realize the badges and letters writing and erasing process. Finally, the established artificial visual convolutional neural network (CNN) through optical/electrical signal modulation can reach the high digit recognition accuracy of 96.5%. Therefore, our results provide a feasible route for future large-scale integrated artificial visual neuromorphic system.

Superior single-atom and single-cluster catalysts towards electrocatalytic nitrogen reduction reactions: a theoretical perspective

The traditional Haber-Bosch process for ammonia synthesis is both energy-intensive and capital-demanding. Electrocatalytic nitrogen reduction reaction (NRR) has emerged as a promising, sustainable alternative, with recent advantages highlighting its potential. Single-atom catalysts (SACs) and single-cluster catalysts (SCCs) are promising catalysts for NRR due to their atomically dispersed active sites, maximized atom utilization, and distinctive coordination and electronic structures, all of which facilitate mechanism insights at the atomic level. Benefiting from efficient atom utilization, for example, the ammonia yield rate on Au1/C3N4 is roughly 22.5 times as high as that of supported Au nanoparticles, fully demonstrating the significant advantages of SACs over nanoparticles. In this review, we focus on the theoretical progress in SACs and SCCs for electrocatalyzing NRR, including nitrogenase-like bio-inspired catalysts and other metal-based catalysts. We further examine key adsorption energy and electronic descriptors that enhance our understanding of catalytic performance. Finally, we discuss the remaining challenges and future directions for advancing SACs and SCCs in electrocatalytic NRR applications.

A DNA origami-based enzymatic cascade nanoreactor for chemodynamic cancer therapy and activation of antitumor immunity.

Chemodynamic therapy (CDT) is a promising and potent therapeutic strategy for the treatment of cancer. We developed a DNA origami-based enzymatic cascade nanoreactor (DOECN) containing spatially well-organized Au nanoparticles and ferric oxide (Fe2O3) nanoclusters for targeted delivery and inhibition of tumor cell growth. The DOECN can synergistically promote the generation of hydrogen peroxide (H2O2), consumption of glutathione, and creation of an acidic environment, thereby amplifying the Fenton-type reaction and producing abundant reactive oxygen species, such as hydroxyl radicals (•OH), for augmenting the CDT outcome. The DOECN is decorated with targeting groups to achieve efficient cellular uptake and efficiently induce tumor cell apoptosis, ferroptosis, and immunogenetic cell death, thus realizing potent anticancer therapeutic effects. Intravenous injection of the DOECN effectively promoted the maturation of dendritic cells, triggered adaptive T cell responses, and suppressed tumor growth in a murine cancer model. The DOECN provides a programmable platform for the integration of multiple therapeutic components, showing great potential for combined cancer therapy.

Immobilization of 4-MBA & Cu2+ on Au nanoparticles modified screen-printed electrode for glyphosate detection.

This study introduces an innovative electrochemical biosensor, engineered through the functionalization screen-printed electrode (SPE) with a coordination complex comprised of 4-mercaptobenzoic acid (4-MBA) and copper ions (Cu2+), achieving precise quantitative determination of glyphosate. Electrodepositing gold nanoparticles (AuNPs) onto the electrode surface, forming a self-assembled monolayer (SAM) of 4-MBA via thiol-gold interactions, and immobilizing Cu2+ via coordination bonding with the monolayer, finalizing the electrochemical biosensor construction as Cu2+/4-MBA/AuNPs/SPE. The successful modification of the biosensor interface is confirmed through scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and electrochemical characterization. Through parameter optimization, critical metrics for the biosensor preparation process have been determined. Using square wave voltammetry (SWV), a linear relationship between the glyphosate concentration and the peak current inhibition ratio at the electrode surface is established. Additionally, the repeatability and anti-interference capabilities of the fabricated biosensors are evaluated. The experimental outcomes affirm the biosensor's capability for quantitative glyphosate detection across a 5-100nM range, boasting a 1.65nM limit of detection (LOD). Testing on tap water samples verifies a robust recovery rate for glyphosate residues, spanning 89.84%-107.48%. The proposed biosensor holds significant promise for glyphosate detection, offering substantial applicability and this study provides a valuable reference for the advancement of biosensors geared toward the quantitative assessment of organophosphate pesticides (OPs).

Mechanistic Insights into the H2 Dissociation on Plasmonic Au Nanoparticles: Effect of Nanoparticle Structure and Pulse Properties on Charge-Driven Energy Transfer and Dissociation Efficiency

Mechanistic Insights into the H₂ Dissociation on Plasmonic Au Nanoparticles: Effect of Nanoparticle Structure and Pulse Properties on Charge-Driven Energy Transfer and Dissociation Efficiency

Composites of YF3: Yb3+, Er3+, Tm3+@C3N4-Au with near-infrared light-driven ability for photocatalytic wastewater purification.

Photocatalytic technology for removing organic dye pollutants has gained considerable attention because of its ability to harness abundant solar energy without requiring additional chemical reagents. In this context, YF3 spheres doped with Yb3+, Er3+, Tm3+ (YF) are synthesized using a hydrothermal method and are subsequently coated with a layer of graphitic carbon nitride (g-C3N4) with Au nanoparticles (NPs) adsorbed onto the surface to create a core-shell structure, designated as YF3: Yb3+, Er3+, Tm3+@C3N4-Au (abbreviated as YF@CN-Au). The core-shell composites demonstrate remarkable stability, broadband absorption, and exceptional photocatalytic activity across the ultraviolet (UV) to near-infrared (NIR) spectral range. Notably, by optimizing the amount of Au loaded, excellent methyl orange (MO) degradation rates of 0.068 min-1 under UV light and 0.423 h-1 under light excitation with λ > 420 nm can be achieved. Even under low-energy NIR light (λ > 800 nm), a degradation rate of 0.087 h-1 was reached, indicating a significantly enhanced degradation effect compared to YF@CN without Au loading. The high performance of the core-shell composite is attributed to its unique structure, which enables efficient transfer of energy and charge carriers, thereby promoting charge separation and suppressing recombination. Furthermore, this article reveals and discusses three distinct photocatalytic mechanisms under UV, visible, and NIR light. This study underscores the considerable promise of core-shell composites in developing efficient g-C3N4-based broadband photocatalysts, focusing on comprehensive utilization of the solar spectrum through the synergistic effects of plasma and upconversion materials.

Enhancing photovoltaic efficiency in Half-Tandem MAPbI3/ MASnI3 Perovskite solar cells with triple core-shell plasmonic nanoparticles

Significant progress has been made through the optimization of modelling and device architecture solar cells has proven to be a valuable and highly effective approach for gaining a deeper understanding of the underlying physical processes in solar cells. Consequently, this research has conducted a two-dimensional (2D) perovskite solar cells (PSCs) simulation to develop an accurate model. The approach utilized in this study is based on the finite element method (FEM). Initially, a new configuration was introduced by incorporating a CH3NH3SnI3 layer as the absorber within the PSC structure, forming a parallel architecture. As a result, the power conversion efficiency (PCE) of PSC increased up to 26.89%. The light trapping process plays an essential role in enhancing the performance of PSCs. For this purpose, we utilized arrays of metal nanostructures on the active layer (AL) which resulted in significantly enhancing light absorption within these layers. In this research, the influence of nanoparticles position within the AL, the radius of nanoparticles and their composition (gold (Au) and silver (Ag)) on enhancing absorption in PSCs are examined by determining the cross-sectional area of light scattering and absorption on Au and Ag nanoparticles. The optimal position for the plasmonic nanoparticles was determined to be inside the MASnI3 as the complementary AL, 60 nm for the radius and Ag as champion composition. As a result of these modifications, the PCE reached 29.52%, representing an approximate 64% improvement compared to the planar structure. Subsequently, dielectric-metal-dielectric nanoparticles were introduced into the MASnI3 layer, replacing the previously embedded metallic nanoparticles, in order to enhance their chemical and thermal stability. According to optical-electrical simulation results, the short-circuit current density (Jsc) of the proposed parallel PSC, featuring triple core-shell nanoparticles composed of TiO2@Ag@TiO2 and SiO2@Ag@SiO2, has been improved by approximately 40% and 41.5%, respectively, compared to a PSC lacking nanoparticles. Moreover, under optimal conditions for the PSC, the open-circuit voltage (Voc), Jsc, fill factor (FF), and PCE were simulated at 1.01 V, 35.17 mA/cm², 84.16, and 30.18%, respectively. This approach paves the way for advancements in the development of perovskite solar cells, offering significant potential for practical applications and enhanced efficiency.

Porous Nanoframe Based Plasmonic Structure With High-Density Hotspots for the Quantitative Detection of Gaseous Benzaldehyde.

Owing to its high sensitivity, surface-enhanced Raman scattering (SERS) has immense potential for the identification of lung cancer from the variation in volatile biomarkers in the exhaled gas. However, two prevailing factors limit the application of SERS: 1) the adsorption of target molecules into SERS hotspots and 2) the detection specificity in multiple interference environments. To improve the density of the SERS hotspots, 3D Au@Ag-Au particles are prepared in a porous nanoframes (PPFs) based plasmonic structure, which facilitated a richer local electromagnetic field distribution among the Au nanocubic (NC) cores, Au-Ag porous nanoframes, and Au nanoparticles, thereby promoting the adsorption probability of gaseous aldehydes into the hotspots. L-cysteines (l-Cys)-modified 3D Au@Ag-Au PPFs are proposed as a benzaldehyde (BA) gas detection carrier to accurately detect biomarkers in complex exhaled gases and eliminate interference from other components. Unlike the conventional use of 4-aminothiophenol as a linker molecule, the novel L-Cys-modified SERS substrate is sensitive toward the aldehyde molecules and immune to other volatile organic compounds (ethanol, cyclohexane, toluene, etc.). Furthermore, a medical mask consisting of this SERS substrate is designed to realize intelligent detection of gaseous BA concentrations assisted by a machine learning algorithm.

Enhanced field emission performance of gold nanoparticle decorated Bi2S3 nanoflowers.

Au nanoparticles (NPs) are decorated on hydrothermally synthesized Bi2S3 nanorods (NRs) to enhance the field electron emission (FEE) performance as compared to bare Bi2S3 nanorods, resulting in reduction in turn-on field from 3.7 to 2.7 V μm-1 (at the current density of 1.0 μA cm-2) with significant increment in maximum emission current density from 138 to 604.8 μA cm-2 (at a field of 7.8 V μm-1) respectively. FESEM/TEM reveals that Bi2S3 nanoflowers are assembled from Bi2S3 NRs of a typical diameter of 120 ± 10 nm, and Au NPs of diameter about 5-10 nm are uniformly decorated onto the surface of NRs to form an Au/Bi2S3 composite. XRD analysis suggests that the as-synthesized product consists of orthorhombic Bi2S3 NRs decorated with face-centered cubic Au NPs. The XPS spectrum shows the elemental mapping of the as-synthesized Au/Bi2S3. Improvement in field emission properties is mainly attributed to a reduction in work function and increasing emitting sites due to Au NP decoration.

Rhodium nanospheres for ultraviolet and visible plasmonics.

The development and understanding of alternative plasmonic materials are crucial steps for leveraging new plasmonic technologies. Although gold and silver nanostructures have been intensively studied, the promising plasmonic, chemical and physical attributes of rhodium remain poorly investigated. Here, we report the synthesis and plasmonic response of spherical Rh nanoparticles (NPs) with sizes in the 20-40 nm range. Due to the high cohesive energy of this metal, synthesis and experimental investigations of Rh nanospheres in this size range have not been reported; yet, it becomes possible here using a green and one-step laser ablation in liquid method. The localized surface plasmon (LSP) of Rh NPs falls in the ultraviolet spectral range (195-255 nm), but the absorption tail in the visible region increases significantly upon clustering of the nanospheres. The surface binding ability of Rh NPs towards thiolated molecules is equivalent to that of Au and Ag NPs, while their chemical and physical stability at high temperatures and in the presence of strong acids such as aqua regia is superior to those of Au and Ag NPs. The plasmonic features are well described by classical electrodynamics, and the results are comparable to Au and Ag NPs in terms of extinction cross-section and local field enhancement, although blue shifted. This allowed, for instance, their use as an optical nanosensor for the detection of ions of toxic metals in aqueous solution and for the surface enhanced Raman scattering of various compounds under blue light excitation. This study explores the prospects of Rh NPs in the realms of UV and visible plasmonics, while also envisaging a multitude of opportunities for other underexplored applications related to plasmon-enhanced catalysis and chiroplasmonics.

Au nanoparticles anchored carbonized ZIF-8 for enabling real-time and noninvasive glucose monitoring in sweat.

Wearable sensors can easily enable real-time and noninvasive glucose (Glu) monitoring, providing vital information for effectively preventing various complications caused by high glucose level. Here, a wearable sensor based on nanozyme-catalyzed cascade reactions is designed for Glu monitoring in sweat. Au nanoparticles (AuNPs) are anchored to the carbonated zeolitic imidazolate framework-8 (ZIF-8-C), endowing the sensor with Glu oxidase (GOx)-like and peroxidase (POD)-like activity. A flexible screen-printed carbon electrode (SPCE) is decorated with the resultant AuNPs@ZIF-8-C, which is further modified with biocompatible and swellable calcium alginate (CA) gels for the preparation of the wearable Glu sensor. The linear range for Glu detection is 10∼300μM with a limit of detection (LOD) of 4.99μM, which covers the physiological Glu concentration range in human sweat (10-200μM). The developed wearable Glu sensor can fit well with the skin tissues due to the flexibility of the SPCE, and thus it can be successfully applied in real-time and noninvasive monitoring of Glu in human sweat. Additionally, the wearable Glu sensor exhibits high antibacterial activity resulted from the generated hydroxyl radicals (·OH), enabling long-term Glu monitoring in sweat.

Hierarchical structures of surface-accessible plasmonic gold and silver nanoparticles for SERS detection.

Surface-enhanced Raman spectroscopy (SERS) is a highly sensitive analytical technique with excellent molecular specificity. However, separate pristine nanoparticles produce relatively weak Raman signals. It is necessary to focus on increasing the "hot-spot" density generated at the nanogaps between the adjacent nanoparticles (second-generation SERS hotspot), thus significantly boosting the Raman signal by creating an electromagnetic field. This study employed a self-assembly method without using modifiers based on promoter-induced self-assembly to synthesize stable and plasmonically active surfaces from citrate-reduced Ag and Au nanoparticles. Hierarchical structures like Pickering emulsions (PEs) and stable plasmonic aggregates (SPAs) were studied, focusing on controlling their sizes using "promoters" (TBANO3). The sizes of the SPAs were also adjusted from 85.5 nm to 136 nm by regulating the ratio of the water to the oil phase. Furthermore, to understand the distribution of "hot-spots" on these Au or Ag hierarchical structures, the electric field was simulated using the finite difference time domain (FDTD) software. Third-generation hotspots were also created using hybrid structures of plasmonic nanomaterials and surfaces to significantly improve SERS detection by depositing the colloidosome structure on Cu foil (AgSPAs/Cu substrate). The SERS signal was amplified by achieving an enhancement factor of 7 × 107, compared to an enhancement factor of 2 × 106 when using the AgSPA/glass substrate. Significantly, the limits of detection (LOD) and quantification (LOQ) for the colloidosome substrate to detect crystal violet were found to be 4.51 ppb and 13.66 ppb, respectively. The reproducibility of the prepared substrates was demonstrated to be commendably high, characterized by relative standard deviations (RSDs) of 8.00% for the 1177 cm-1 peak, 7.61% for the 1588 cm-1 peak, and 9.35% for the 1619 cm-1 peak. The AgSPAs/Cu substrate's demonstrated reliability made it suitable for detecting and quantifying analytes, potentially for determining trace amounts of pesticide residues. The LOD and LOQ for thiram detection were calculated to be 0.1 ppm and 0.3 ppm, respectively. These findings highlight the effectiveness of increasing electromagnetic field density for SERS enhancement.

Advances in detecting non-steroidal anti-inflammatory drugs (NSAIDs) using molecular receptors and nanostructured assemblies.

The detection and quantification of non-steroidal anti-inflammatory drugs (NSAIDs) are crucial due to their widespread use and potential impact on human health and the environment. This review provides a comprehensive survey of the recent advancements in sensing technologies for NSAIDs, focusing on molecular receptors and nanostructured assemblies. Molecular receptors based on different fluorescent molecules such as anthracene, naphthalimide, squaraine, quinoline, BINOL, etc. offer high selectivity and sensitivity for NSAID detection. In parallel, nanostructured assemblies including CdSe/ZnS, Cd/S quantum dots (QDs), carbon dot-containing imprinted polymers, Ag and Au nanoparticles (NPs), hydrogel-embedded chemosensors, etc. were utilized for NSAID detection. This review highlights the different binding pathways with the change of various photophysical properties combining molecular recognition elements with nanomaterials to develop innovative sensors that achieve rapid, sensitive, and selective detection of NSAIDs. The review also discusses current challenges and future prospects in the field and based on reported designed receptors and nanostructured assemblies. To the best of our knowledge, no reviews have been reported on this topic so far. Thus, this review will fruitfully guide researchers to design various new molecular receptors and nanostructured materials to detect NSAIDs.

Sustainable Nitrophenol Reduction Using Ce-MOF-808-Supported Bimetallic Nanoparticles Optimized by Response Surface Methodology

This study presents the development and optimization of Ce-MOF-808 nanocrystals supported by metallic and bimetallic nanoparticles (Au, Ag, and Pd) for the efficient reduction of nitrophenol. Using a sol-immobilization method, we synthesized a series of catalysts, including Au/Ce-MOF-808, Au-Ag/Ce-MOF-808, and Au-Pd/Ce-MOF-808, and evaluated their catalytic efficacy of 4-nitrophenol (4-NP) reduction using NaBH₄ under mild conditions. Initially, effects of time (1-18 min), and catalyst dose (1-6 mg) on the reduction of nitrophenol were investigated through the one-factor-at-a-time experiment. Furthermore, the optimized experimental conditions (reduction time of 18 min, and catalyst dose 4.5 mg) were obtained using response surface methodology (RSM). X-ray photoelectron spectroscopy (XPS) and thermogravimetric assessment (TGA) further confirmed the robust interaction between metal nanoparticles and the Ce-MOF-808 framework, contributing to enhanced thermal stability and electron transfer capabilities. Among these, the Au-Ag/Ce-MOF-808 composite exhibited the highest catalytic activity, achieving a 98.3% conversion of 4-NP to 4-aminophenol (4-AP) within 18 minutes. Kinetic studies confirmed the superior catalytic performance of Au-Ag/Ce-MOF-808, with a rate constant (kapp) of 0.100 min⁻1 and a reduced half-life of 9.6 minutes, highlighting the synergistic effects of Au and Ag nanoparticles in enhancing electron transfer and increasing active sites. The reusability tests demonstrated that Au-Ag/Ce-MOF-808 maintained high catalytic activity over five consecutive cycles, indicating its stability and suitability for continuous use. These findings underscore the potential of metal-modified Ce-MOF-808 catalysts for sustainable environmental applications, offering high efficiency, durability, and the ability to operate under mild conditions.

Design of a Co doped carbon Backbone with self-grown Au nanoparticles via a ‘Triple Advantage’ Strategy for sensitive dopamine detection

Design of a Co doped carbon Backbone with self-grown Au nanoparticles via a ‘Triple Advantage’ Strategy for sensitive dopamine detection