Inorganic Chemistry Frontiers
·
2021
·Vol. 9
·期 2
·302-309
·
IF 6.569
Jiayu Xin,Fei Li,Zhen Li,Jiaqi Zhao,Yu Wang
Single-atom dispersed carbon nitride photocatalysts have been extensively associated with clean energy conversion, storage and utilization. However, it is still a challenge to elucidate the relationship between the electronic structure of catalysts and their photocatalytic properties. In this work, single atom Ag/C3N4 catalysts have been prepared via pyrolyzing cyanuric acid, AgNO3 and melamine as precursors. We observe that their photocatalytic activity increases on increasing the concentration of Ag from 0.32% to 0.53%, and subsequently decreases on further increasing the concentration of Ag, which indicates that the concentration of Ag atoms can control the performance of single-atom catalysts. Deep investigations suggest that the concentration of Ag atoms can modulate the bottom of the conduction band (CB) and the maximum of the valence band (VB). The higher the bottom of the CB is, the better the performance of catalysts is. In contrast to bulk carbon nitride, the rate constants of the optimized single-atom photocatalyst Ag/C3N4 with 0.53% Ag for rhodamine B (RhB) and tetracycline (TC) degradation are enhanced approximately 165.3 and 24.9 times, respectively. Furthermore, the ESR spectrum shows that the superoxide radical plays a major role in the photocatalytic process. This work provides a new insight into the structure–property relationship and our strategy provides guidance for the synthesis of other single-atom photocatalysts.
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POLYMER ENGINEERING AND SCIENCE
·
2021
·Vol. 62
·期 2
·576-585
·
IF 2.428
Yang Liu,Tingting Liu,Xiangchi Liu,Baijun Liu,MingYao Zhang
In this research, monodispersed polystyrene (PS) microspheres were prepared by dispersion polymerization. PS microspheres decorated with silver nanoparticles (PS/Ag composite microspheres) were synthesized by a modified chemical plating method with water as the synthesis medium. The microspheres at each stage were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), UV–visible spectroscopy (UV–vis), field-emission scanning electron microscopy (FESEM), and energy-dispersive spectrometer (EDS). The reduction of methylene blue (MB) was carried out with PS/Ag composite microspheres as a catalyst and NaBH 4 as a reducing agent. The results showed that the MB dye was reduced to colorless within 180 s. The reduction of the MB dye followed pseudo-first-order kinetics with an apparent rate constant (K app ) value of 0.01425 s −1 . Control experiments were also carried out by adding microspheres from each chemical plating pretreatment stage to the MB, without PS/Ag composite microspheres. The catalytic activity of the PS/Ag composite microspheres was high after five consecutive cycles of recovery, showing promising reusability. The catalytic activity of the prepared PS/Ag catalysts was superior to other catalysts for the reduction of MB.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Jinqiu Xu,Haoyu Chen,Jing Liu,Jianru Tang,Xiaohua Zhu,Sheng Yang,Shu Huang,Youyu Zhang,Meiling Liu
The development of analytical methods capable of simultaneously detecting multiple components in biological samples holds significant potential for advancing disease diagnosis. However, constructing optical platforms for continuous detection remains challenging due to limitations such as insufficient selectivity, specificity, response speed, and sensitivity. Herein, we developed a facile and efficient microwave-assisted method to rapidly synthesize CuS quantum dots (QDs) and constructed a fluorescence-based sensing platform for detecting Ag + and glutathione (GSH). The fluorescence emission of CuS QDs at 500 nm was selectively quenched upon interaction with Ag + , exhibiting a linear correlation with Ag + concentrations ranging from 0.3 to 300 μM. Notably, the quenched fluorescence could be restored by introducing GSH, accompanied by a slight redshift in the emission wavelength. This Ag + -mediated “off-on” fluorescence sensing mechanism significantly enhanced the sensitivity for GSH detection. This platform demonstrated high selectivity towards both Ag + and GSH, enabling their quantitative determination in complex matrices, including tap water, human serum, and cell lysate. This work not only presents a novel synthetic approach for CuS QDs but also achieves successive detection of Ag + and GSH without requiring complex probe modifications or the integration of multiple nanomaterials, representing a simplified yet highly effective design compared to more intricate systems. The proposed platform serves as a versatile measurement tool applicable across various fields, from environmental contaminant monitoring to the detection of key biological thiols, demonstrating a generalizable strategy for diverse analytical scenarios in both environmental and clinical contexts.
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Analytical Methods
·
2025
·
IF 2.6
Jinping Tang,Yuhai Wang,Chunxu Wang,Ziwei Yu,Jin Wang
Surface-enhanced Raman scattering (SERS) has emerged as a powerful analytical tool for trace molecular detection, enabling identification of target analytes through their characteristic vibrational fingerprints. Its high sensitivity, selectivity, and non-destructive detection capabilities make it extremely valuable in fields such as biological detection, food safety, and environmental detection. Currently, metal carbonitride (MXene) as an emerging two-dimensional material has become a hot topic in the field of SERS. In this work, by combining the advantages of bimetallic nanoparticles and MXene nanosheets, Ni/Ag nanoparticles with different proportions were modified on monolayer MXene nanosheets through chemical reduction and transmetallation reactions for the rapid detection of thiram. The evaluation of the SERS performance of the MXene–Ni/Ag composite substrate for the Raman reporter molecule mercaptobenzoic acid (MBA) demonstrates a high SERS performance factor (SPF) of 8.2 × 106, and a low detection limit of 10−10 M. Also, for the detection of the pesticide thiram, the substrate exhibits high sensitivity and reliable quantitative analysis capabilities, retaining detectable spectral features even at concentrations down to 10−9 M. Meanwhile, the substrate also exhibits a low relative standard deviation (RSD) value in reproducibility and maintains good stability over a certain period. Ni/Ag bimetallic nanoparticles provide high SERS activity, while MXene nanosheets effectively concentrate target molecules through their strong adsorption capacity. These results indicate that MXene–Ni/Ag composite substrates can serve as a highly effective SERS platform for sensitive and reliable environmental monitoring.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Kelin Hu,Tao Li,Xinyuan Li,Jing Zhang,Yu He
Acetylene is of great significance for early warning gas of thermal runaway in lithium-ion batteries (LIBs). In this work, we designed a structure of nanoparticle decorated In 2 O 3 /CeO 2 nanofibers and prepared them by electrospinning. Then we regulated the sensing properties by doping Ag, and acquired an optimal sensor for detecting C 2 H 2 gas. Morphology and structure have been characterized. The gas sensor exhibited good response for acetylene. In a low temperature of 160 °C, the response (R a /R g ) exceeded 9.7 in C 2 H 2 gas with a concentration of 100 ppm. Rapid response in 45 s, and outstanding long-term stability have also been proved. The key point was that the sensor can all achieve a response over 2 within the temperature range of 20 °C to 220 °C. This temperature range coincides with the internal temperature variation range of LIB cells including the normal condition and early stage of thermal runaway. Meanwhile, the reproducibility of electrospinning method has already been verified. Furthermore, we fabricated the LIBs implantable sensor and tested its built-in stability, then we found that the sensor had a highly differentiated response signal to distinguish C 2 H 2 gas and temperature. Finally, according to the nanostructure of sensing materials, acetylene sensing mechanism has been proposed.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Lihong Zhang,Yuhang Qi,Jinghui Lai,Xilian Hu,Bibo Yu,Ziyang Li,Shengli Wang,Chong Luo
An ultra-smooth silicon carbide (SiC) wafer surface is critical for the performance and longevity of semiconductor, optoelectronic, and high-temperature devices. In this study, a novel photocatalytic chemical mechanical polishing (CMP) strategy is proposed using Ag-loaded CeO 2 abrasives, in which Ag establishes strong electronic metal–support interactions (EMSI) with CeO 2 . This system achieves an ultra-low surface roughness of 0.086 nm while maintaining a high material removal rate of 445.5 nm/h. Under UV illumination, Ag nanoparticles function as electron sinks, suppressing electron–hole recombination and promoting the generation of reactive oxygen species (•OH and •O 2 − ), which rapidly oxidize the SiC surface into a softer SiO 2 layer. Concurrently, oxygen vacancies in CeO 2 act as critical active sites for Ce–O–Si bond formation, facilitating mechanical removal. The incorporation of Ag also effectively stabilizes oxygen vacancies by suppressing their passivation in strongly oxidizing slurries, thereby preserving their reactivity and enhancing the mechanical removal efficiency. This CeO 2 -based metal–support architecture furnishes advanced mechanistic insights and strategic design principles for CMP processes predicated on oxidation-facilitated removal pathways.
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Desalination and Water Treatment
·
2025
·
IF 1
An Nang Vu,Ngoc – Hoa T. Le,Thanh- My T. Nguyen,Uyen N. Nguyen-Thai,Kim – Phung L. Nguyen,Lan Duc Vu
We present a straightforward method for creating reusable magnetic Fe 3 O 4 /Ag catalysts. Three distinct Fe 3 O 4 varieties were synthesized using different methods, and Ag nanoparticles were deposited onto the Fe 3 O 4 matrix via a hydrothermal process. The resulting Fe 3 O 4 and Fe 3 O 4 /Ag materials were characterized by XRD, XPS, FT-IR, Raman, DLS, FE-SEM, TEM, EDX, VSM, and UV-Vis spectroscopy. XRD analysis of the Fe 3 O 4 particles synthesized using the solvothermal reduction process (S2) revealed firm diffraction peaks, indicating high crystallinity. After hydrothermal treatment, S2/Ag retained a hollow spherical morphology and magnetic properties similar to Fe 3 O 4 . The synthesized Fe 3 O 4 /Ag catalytic performance was evaluated for the reduction of 4-nitrophenol (4-NP) and methyl orange (MO) dye in the presence of NaBH 4 . All catalysts effectively reduced both dyes and could be magnetically separated from the aqueous solution. The P1/Ag catalyst achieved over 95 % reduction of MO and 4-NP within 2 minutes. S2/Ag exhibited superior stability, preventing Ag leaching during the reaction. Furthermore, its high saturation magnetization allows easy magnetic extraction from the solution. These findings strongly suggest S2/Ag as a promising catalyst due to its selectivity and advantageous properties.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Dan Huang,Ling Li,Siqi Wei,Kaixi Yin,Wenjuan Shang,Xiandeng Hou,Li Wu
Heterogeneous bimetallic materials have attracted widespread concern in surface-enhanced Raman scattering (SERS) since the interactive coupling between these heterogeneous zones produces a synergistic enhancement effect. Developing a quick and easy method to prepapre bimetallic materials with superior SERS properties is therefore very important. A novel approach of electrodeposition followed by the galvanic replacement reaction (GRR) was proposed for fast fabricating copper-silver bimetallic heterogeneous dendrites on nickel foam (Cu-Ag dendrites@NF) as a stable SERS substrate. The morphology and compositions of the dendritic structure were well characterized by SEM, and XPS imaging provided a micro-area composition analysis. The metallic Cu-Ag dendrites exhibited better SERS enhancement performance than the pure metal, with an enhancement factor of 37 times that of the pure Ag cubes@NF, and 6 times that of the Ag dendrites@NF. The reason is that both the synergistic effect of plasmon coupling from bimetal Cu-Ag and the dendritic structure with large surface area and cusps contributed to electromagnetic enhancement. The substrate was successfully used for the detection of pesticide thiram, dye molecule crystal violet (CV), and toxic aromatic amines p-Aminoazobenzene (pAAB), with limits of detection (LODs) down to 10 −8 M, 10 −9 M, and 10 −8 M, respectively. This method provides a novel fast approach to fabricate a bimetallic substrate with high SERS activity, and may have broad applications in food analysis and environment monitoring.
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ANALYTICA CHIMICA ACTA
·
2017
·
IF 4.95
Yi Wang,Yang Zeng,Wensheng Fu,Pu Zhang,Ling Li,Cuiying Ye,Lan Yu,Xiaochun Zhu,Song Zhao
Seed-mediated growth has been employed as a simple and powerful means to the shape-controlled synthesis of metal nanocrystals . In this work, we apply the principle of seed-mediated growth in analytical chemistry , and achieve improved sensitivity due to the low energy barrier in the target-induced formation of bimetallic nanoparticles with core-shell structure. As a result, a simple, reliable, highly sensitive and selective method for the detection of ellagic acid (EA), a naturally occurring polyphenolic antioxidant , has been developed. With the aid of EA in alkaline solution, Ag + ions can be transformed to Ag atoms and deposit on the surfaces of Au nanorods (AuNRs, act as seeds here) to generate Au@Ag core-shell nanorods, accompanied by blue shift of the longitudinal localized surface plasmon resonance (LSPR) band of AuNRs from near-infrared region to shorter wavelengths. Based on the linear relationship between the wavelength change of longitudinal LSPR band and the concentration of EA, our method achieves a detectable range of 0.2–20 μM and a limit of detection as low as 40 nM toward EA. This approach is highlighted by its high sensitivity for EA assay, which benefits from the viewpoint of thermodynamics in the nucleation/growth mode of metal nanoparticles. Moreover, this method shows high selectivity for EA detection when potential species coexist, and thus has been successfully applied in the detection of EA in skin-whitening cosmetics. The proposed strategy of seed-mediated growth herein can also be extended to other systems for sensing.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Peng Bo Huang,Jing Long Qu,Shuo Yang,Tian Jiao Shui,Huan Huan Yang,Li Ping Cheng,Yang Qin,Jun Xi
Glycinin is a common food allergen, which may cause allergic shock in severe cases, thus posing a threat to public health. Therefore, rapid and accurate detection of glycinin is crucial. In this study, we synthesized Au Ag core–shell nanoparticles loaded with the Raman reporter molecule 5,5′-dithiobis(2-nitrobenzoic acid) (DTNB), which provides both colorimetric and Raman signal capabilities. These nanoparticles were applied to colorimetric lateral flow immunoassay (CM-LFIA) and surface-enhanced Raman scattering-based lateral flow immunoassay (SERS-LFIA), respectively. The CM-LFIA achieved a visual limit of detection (LOD) of 1 ng/mL, while the SERS-LFIA exhibited a LOD of 40 pg/mL, with good linearity over the range of 1 ng/mL to 10 4 ng/mL (R 2 = 0.997). Moreover, the quantitative SERS-LFIA demonstrated satisfactory performance in spiked food matrix samples, achieving acceptable recoveries of 82–88 % and RSD ranging from 4.88 % to 6.97 %.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Shuang Xiong,Tao He,Tao Zhou,Dalei Wang,Yueyue Wang,Chaoqing Dai,Wei Liu
Pesticides are often overused in production and life, which harms the environment and human health. However, the current tools for detecting pesticides are not effective enough due to lower flexibility and stability. With regards to this, we synthesized a flexible substrate of PDMS modified by MXene (Ti 3 C 2 Tx)/Ag. The MXene-noble metal composite substrate can detect 4-mercaptobenzoic acid (4MBA) at a low concentration of 1.0 × 10 −11 M. Furthermore, MXene can inhibit the oxidation of Ag nanoparticles (NPs) and efficiently localize the molecules to be tested within the hot spots. In particular, the flexibility of the substrate enables the detection of trace amounts of thiabendazole (TBZ) by collecting samples directly from uneven surfaces such as fruits and vegetables. The substrate is also capable of detecting a mixture of TBZ and 4MBA simultaneously. Using intrinsic Raman peak of PDMS as the internal standard can eliminate the influence of environmental factors on the detection results, which makes the detection results more quantitative. The resultant noble metal-semiconductor substrates show great potential applications in food safety and environmental monitoring fields.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Zhongjia Wu,Junlun Zhu,Wei Wen,Xiuhua Zhang,Shengfu Wang
4-Nitrophenol (4-NP) is water pollutant with good stability, high toxicity and difficult degradation, which will cause great harm to the environment. Thus, the development of high efficiency and rapid catalysts for the degradation of 4-NP will be an urgent problem to be solved. Herein, we synthesized covalent organic framework supporting Cu/Ag bimetallic nanoparticles (Cu/Ag–COF), which had better catalytic activity for the reduction of 4-NP. The porous COF possess large surface area of approximately 737.8 m 2 /g, so it can provide abundant sites for loading metal nanoparticles . At the same time, COF could also improve the stability and catalytic effect of nanocatalyst under flexible condition. The prepared Cu/Ag–COF exhibited the higher catalytic reduction of 4-NP into 4-aminophenol (4-AP) under the condition that the molar ratio of NaBH 4 to 4-NP was 147 and achieved an apparent rate constant of k Cu/Ag – COF = 0.0073 s −1 . The apparent rate constant of Cu/Ag–COF was higher than that of Ag–COF ( k Ag-COF = 0.0032 s −1 ) and Cu–COF ( k Cu-COF = 0.0047 s −1 ), indicating that this system had a synergistic catalytic effect to improve the catalytic activity of metal nanoparticles . Moreover, Cu/Ag–COF still had good catalytic effect after eight cycles, which indicated that it had good stability and reusability. This work provides a novel strategy to fabricate COF supported nanoparticles for outstanding performance in treating wastewater containing 4-NP.
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