Chemosensors
·
2024
·Vol. 12
·期 5
·82
·
IF 3.7
Minghui Yu,Chongyang Qin,Zhi Yu,Biao Sun,Dejiang Ni,De Zhang,Pei Liang
Surface-enhanced Raman scattering (SERS) provides an alternative rapid detection method for pesticide residues in food, but fenvalerate possesses poor affinity to the novel metal substrate, thus restricting its analysis. To break this bottleneck, a SERS-active platform with an Ag/rGO composite structure was engineered using a facile method for fenvalerate detection. Ag nanoparticles with a 60 nm diameter can grow evenly on the top and bottom of rGO layers under intense ultrasonic oscillation, and rGO in hybrid material acts as an ideal hotspot holder between the gaps of Ag nanoparticles, not only allowing the interaction area to be enhanced both electromagnetically and chemically but also enabling the capture and enrichment of fenvalerate pesticide molecules into the “hotspot” area to improve detection sensitivity. Ag/rGO composite substrate possesses superior SERS performance with an ultralow detectable concentration of 4-aminothiophenol (10−10M) and good reproducibility, endowing the material with a better enhancement effect than pure Ag nanoparticles. When used as the SERS substrate for fenvalerate detection, Ag/rGO composite material showed excellent performance in both experiments and theoretical calculation, with the limit of detection (LOD) of fenvalerate being as low as 1.69 × 10−5mg/kg and a detection model with an R2of 99.2%, demonstrating its exciting potential as a SERS substrate for pesticides detection.
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Advanced Science
·
2024
·Vol. 11
·期 25
·2401515
·
IF 14.3
Ziyan Yang,Qingzhou Wang,Huixin Yu,Qing Xu,Yuanyue Li,Minghui Cao,Rajendra Dhakal,Yang Li,Zhao Yao
Self-powered pressure detection using smart wearable devices is the subject of intense research attention, which is intended to address the critical need for prolonged and uninterrupted operations. Current piezoelectric and triboelectric sensors well respond to dynamic stimuli while overlooking static stimuli. This study proposes a dual-response potentiometric pressure sensor that responds to both dynamic and static stimuli. The proposed sensor utilizes interdigital electrodes with MnO 2 /carbon/polyvinyl alcohol (PVA) as the cathode and conductive silver paste as the anode. The electrolyte layer incorporates a mixed hydrogel of PVA and phosphoric acid. The optimized interdigital electrodes and sandpaper-like microstructured surface of the hydrogel electrolyte contribute to enhanced performance by facilitating an increased contact area between the electrolyte and electrodes. The sensor features an open-circuit voltage of 0.927 V, a short-circuit current of 6 µA, a higher sensitivity of 14 mV/kPa, and outstanding cycling performance (>5000 cycles). It can accurately recognize letter writing and enable capacitor charging and LED lighting. Additionally, a data acquisition and display system employing the proposed sensor, which facilitates the monitoring of athletes’ rehabilitation training, and machine learning algorithms that effectively guide rehabilitation actions are presented. This study offers novel solutions for the future development of smart wearable devices.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Lin Ai,Hui Ding,Yutong Jiao,Zeling Zhou,Xiao-Feng Wu,Peidong Li,Shengjun Huang
In the field of heterogeneous catalysis, the selective hydrogenation of α,β-unsaturated aldehyde to α,β-unsaturated alcohol is a prominent focus in the synthesis of fine chemicals. Herein, we present a straightforward protocol for constructing hierarchical zeolite supported catalysts for the gas-phase selective hydrogenation of α-methylacrolein to methallyl alcohol. Compared to the original microporous zeolite, the incorporation of mesoporous channels within the hierarchical zeolite gives rise to ample space to embed Ag nanoparticles, thereby delivering a positive effect on enhancing accessibility to metal active sites and leading to increased reactivity. Moreover, unlike the typical transition metals (Pt, Ni, Cu and Co), the unique surface properties of metal Ag inherently plays a crucial role in the formation of a desirable adsorption configuration. The resulting vertical orientation (on-top η1-σ(O) mode) causes the carbonyl group to interact with the Ag active sites via the terminal oxygen atom, while the C=C bond tilts away from the metal surface. Specifically, the selectivity to the targeting methallyl alcohol reaches ~75% over the hierarchical ZSM-5 and Silicalite-1 supported Ag catalysts under optimal reaction conditions. This discovery highlights the significance of pore architecture and adsorption configuration on the catalytic performance, and aims to deepen understanding for the rational design of heterogeneous catalysts in the gas-phase selective hydrogenation of α,β-unsaturated aldehydes.
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Nanoscale
·
2024
·Vol. 16
·期 9
·4591-4599
·
IF 5.8
Ouyang Lin,Lijin Wang,Xiulin Xie,Shuaibing Wang,Yibo Feng,Jiawen Xiao,Yu Zhang,Aiwei Tang
Silver-based I–III–VI-type semiconductor nanocrystals have received extensive attention due to their narrow-band luminescence properties. Herein, we demonstrated a seed-mediated growth of quaternary Ag–In–Ga–S (AIGS) nanocrystals (NCs) with narrow-band luminescence. By conducting partial cation exchange with In3+ and Ga3+ based on Ag2S NCs and controlling the Ag/In feeding ratios (0.25 to 2) of Ag–In–S seeds as well as the inventory of 1-dodecanethiol, we achieved optimized luminescence performance in the synthesized AIGS NCs, characterized by a narrow full width at half maximum of less than 40 nm. Meanwhile, narrow-band luminescent AIGS NCs exhibit a tetragonal AgGaS2 crystal structure and a gradient alloy structure, rather than a core–shell structure. Most importantly, the kinetics decay curves of time-resolved photoluminescence and the ground state bleaching in transient absorption generally agree with each other regarding the lifetime of the second decay component, which indicates that the narrow-band luminescence is due to the slow radiative recombination between trapped electrons and trapped holes located at the edge of the conduction band and the deep silver-related trap states (e.g., silver vacancy), respectively. This study provides new insights into the correlation between the narrow-band luminescence properties and the structural characteristics of AIGS NCs.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yujie Zhang,Rongfang Yuan,Huilun Chen,Beihai Zhou
Combining adsorption and photocatalysis as a synergistic technique has become a research trend since adsorption is a prerequisite for photocatalytic surface reactions. In this study, a Z-scheme heterojunction FeTiO 3 @Ag/Ag 2 O with local surface plasmon resonance (LSPR) effect was fabricated for the removal of dimethoate from water. Under visible light irradiation, dimethoate could be completely removed within 75 min in the presence of 0.3 g/L FeTiO 3 @Ag/Ag 2 O (with Ag 2 O percentage of 10 wt%). High removal efficiency of dimethoate was mainly attributed to the synergistic effect between the large specific surface area of the catalyst (160.695 m 2 /g), the formation of heterojunction of FeTiO 3 and Ag 2 O, and the LSPR effect of metal Ag, which reinforced the absorption of visible light and promoted the separation and transfer of the carriers. Radicals of O 2 − and OH were the main reactive groups triggered the photocatalytic degradation process of dimethoate. Density Functional Theory (DFT) calculations indicate that P S and P–S bonds in the dimethoate molecule were more susceptible to be attacked by reactive groups. The degradation pathways mainly include oxidation of P S bond and cleavage of P–S bond, and the toxicity of most intermediates was reduced when compared with the parent compound. This study exploited the role of adsorption and photocatalysis in the field of pollutant removal, and provides ideas for the preparation of bifunctional photocatalysts.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Qi He,Qiuping Yang,Xiangyu Tong,Xiaotong Zhang,Yi Wang,Xiaohu Wu,Yanyun Ma,Yiqun Zheng
Precise spectral modulation of plasmonic absorptions in the near-infrared (NIR-I and NIR-II) regions is crucial for matching laser wavelengths in practical applications, driving significant interest in sensing, photothermal therapy, and bioimaging. In this work, we show that silver (Ag) alloying in gold (Au) nanosheets provides tunable plasmonic absorption across both NIR-I (700–950 nm) and NIR-II (1000–1350 nm) spectral windows while preserving their intrinsic two-dimensional morphology. Through controlled variation of the Ag/Au ratio in a seed-mediated synthesis, we observe a continuous blue-shift of the in-plane dipole plasmon resonance from 1000 nm (NIR-II) to 700 nm (NIR-I). Theoretical simulations confirm that Ag incorporation tunes plasmonic responses by modulating both the free electron density and local dielectric environment. This morphology-preserved alloying approach establishes a versatile platform for developing optically switchable nanomaterials with promising applications in multiplexed biosensing and wavelength-selective photothermal therapy.
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Analytical Methods
·
2025
·
IF 2.6
Xinyan Liu,Chao Liu,Qingyue Hu,Huihui Ge,Jie Tan,Jianhua Wang,Wei Bian
It is important to be capable of achieving highly selective detection of Ag+ and Hg2+ because their excessive concentrations may pose a serious threat to human health and lead to a variety of diseases. Herein, a new type of orange fluorescent carbon dot with an emission wavelength of 590 nm was synthesized by a hydrothermal method using 1,2,4-triaminobenzene dihydrochloride and ethylenediamine as raw materials. The synthesized orange carbon dots have high affinity for Hg2+ and Ag+ ions, which can be selectively detected by fluorescence quenching with the detection limits of 0.37 nM and 0.65 nM, respectively. Moreover, the carbon dots have good fluorescence stability for the rapid detection of Ag+ and Hg2+ over a wide pH range. Importantly, the addition of EDTA reversibly restored the fluorescence intensity of the mixed solution of carbon dots and Hg2+, but not the fluorescence intensity of the Ag+-containing probe solution, which allowed for a clear distinction between Hg2+ and Ag+. In addition, the carbon dots have good biocompatibility and low toxicity to MCF-7 cells, which can be used for cell imaging and intracellular ion detection.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Fang Yan,Rong Deng,Shaohui Guo,Xiaochun Li
Excessive pesticide residues have posed a severe risk to human health and ecological environment, making stringent testing of them a crucial step in food safety supervision. Herein, a flexible paper-based SERS platform composited of AgNPs and MoS 2 nanoflowers was developed for the rapid and ultra-sensitive detection of thiram in juice. Among it, the hydrophobic MoS 2 -modified paper was first fabricated, followed by co-depositing small-sized AgNPs and thiram molecules onto its surface for SERS analysis. Owing to the unique petal-like structure and high hydrophobicity of MoS 2 -coated paper, the AgNPs loaded on it was significantly aggregated, thereby generating numerous “hot spots” in the nanogaps between adjacent silver nanoparticles. Simultaneously, thiram molecules were enriched and concentrated within these gaps, resulting in exceptional Raman signal amplification. Compared to single-material substrates, an integrated advantage was acquired with hybridizing of AgNPs and MoS 2 . The performance of this platform was verified by detecting thiram in pear juice using a portable Raman spectrometer, in which the limit of detection (LOD) can be as low as 1.01 ng/mL and its recovery percentages had a good consistency with ones of HPLC-MS/MS. Overall, this Ag/MoS 2 hybrid SERS platform exhibits outstanding stability, sensitivity and feasibility in the label-free detection of pesticides in food. It also provided a universal tool for the on-site monitoring of diverse biochemical molecules across various fields.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
MengYang Wang,Yu Mao,Wenjian Chan,Yuanyuan Huang,Yanmei Deng,ZiYang Ren,Ening Gu,Xianzhong Lin,Guowei Yang
Silver (Ag) doping improves the efficiency of kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells, yet concurrently suppresses the hole carrier concentration. While lithium (Li) doping can mitigate this issue through Li Zn antisite defect formation to restore hole density, the inherent polycrystallinity of CZTSSe imposes a critical compromise: elevated carrier concentrations intensify grain boundary scattering and non-radiative recombination. This fundamental constraint highlights the necessity of strategic grain boundary engineering for efficiency enhancements. Herein, synergistic Na/Li co-doping was implemented to simultaneously attain high carrier concentration and modify grain boundary characteristics. This synergistic approach yields a remarkable 24 % relative efficiency enhancement (from 11.36 % to 14.08 %) attributed to simultaneous improvements in charge carrier mobility and minority carrier lifetime. In addition, the contribution of Na versus Li to the increase in photovoltaic performance is different in Ag alloying (Li > Na) and Ag-free (Li < Na) devices, implying that the preparation of highly efficient device cannot be based on previous understanding.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zijian Li,Long Cheng,Ziyi Wang,Mengya Chen,Liang Wang,Kuzmin Anton,Xingqiao Wu,Ting Bian
Amid burgeoning population growth and rapid industrialization, freshwater resources are under mounting pressure. This study introduces a novel interfacial evaporator employing a biomimetic spider-cavity structure composed of Ag nanoparticle-decorated polydopamine-coated CuO x /NiO composite on copper foam (Ag/PDA@NiCuO/CF). This design integrates hierarchical micro-nano architectures that maximize light absorption (91 %) and enhance localized photothermal conversion. Bilateral siphon-driven channels independently manage seawater supply and brine drainage, effectively preventing salt accumulation on the photothermal surface. Experimental results demonstrate that the proposed evaporator, under one sun illumination, achieves an evaporation rate of 1.50 kg m −2 h −1 and a solar-to-steam conversion efficiency of 96.7 %. It maintains stable evaporation performance under high salinity (20 wt% NaCl) and shows no salt deposition after 10 h of continuous evaporation, exhibiting excellent anti-salt deposition capability. Practical outdoor tests further validate its reliability, with stable operation and an average evaporation rate of ∼1.58 kg m −2 h −1 over 9 h. Ion concentration and electrical resistance tests confirm its high desalination efficiency, meeting the drinking water standards set by the WHO. Overall, this spider-cavity structured evaporator represents an innovative solution to address solar desalination challenges, particularly in salt management and stable, high-efficiency water purification.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Xinlan Wang,Menghan Qi,Zhengyi Chen,Gongke Li,Huasheng Lai
Long-term adsorption saturation of plasmonic substrate and serious matrix interference are two challenges limiting on-site detection of aquatic products by surface-enhanced Raman scattering (SERS). Herein, an enrichment-sensing strategy was presented for rapid SERS analysis of nitrofurantoin and methylene blue in aquatic products by AgNPs decorated olive-shaped ZnO substrate. The substrate with an enhancement factor of 2.7 × 10 7 , achieved rapid enrichment and SERS sensing of nitrofurantoin and methylene blue in 5 min. The detection limits were 8.9 and 0.46 μg/L for nitrofurantoin and methylene blue, respectively. Signal uniformity was achieved with RSDs below 7.5 % ( n = 31), and batch-to-batch stability showed RSDs below 9.8 % ( n = 7). The substrate exhibited reusability for over 5 cycles and long-term stability over 7 weeks. The enhancement mechanisms were simulated using the finite-difference time-domain method and a charge-transfer model. The strategy was successfully applied for rapid SERS analysis of nitrofurantoin and methylene blue in aquatic products with recoveries of 91.6 %–113.2 % and RSDs of 0.5 %–7.8 % ( n = 3).
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TALANTA
·
2024
·
IF 5.6
Lei Chen,Kexin Hu,Jiaqi Wang,Guangyu Ge,Ran Ma,Yongning Wu,Qinghua He
The simultaneous detection and removal of Ag + from drinking water was crucial for preventing human health, while it was also extremely challenging due to bifunctional materials that combine both Ag + adsorption and detection functions rarely being explored. In this study, a benzotrithiophene-based covalent organic framework (TAPA-BTT) was synthesized and applied to detect and remove Ag + . TAPA-BTT exhibited high crystallinity, a large specific surface area, and good thermal stability. As a fluorescent probe, TAPA-BTT had a low detection limit (0.14 μg/L), wide linear range (0.2-700 μg/L), and good linearity (R 2 > 0.9948). It was also successfully applied to identify Ag + in drinking water including tap, pure, and mineral water with satisfactory detection performance. Moreover, TAPA-BTT had a high efficiency in removing Ag + from water, offering a high capacity for adsorption (344.83 mg/g) and a removal rate of 99.45%. The adsorption of TAPA-BTT towards Ag + can be well explained by the quasi-second-order kinetic model and the Langmuir isotherm model. In addition, experimental and theoretical studies revealed the interaction mechanism between TAPA-BTT and Ag + . The specific Ag + detection by TAPA-BTT was assumed to be caused by the electron transfer from thiophene-S to Ag + , which enhanced the fluorescence of TAPA-BTT. The effective removal of Ag + was attributed to the co-chelation of imine-N and thiophene-S on TAPA-BTT. These novel findings revealed the great potential of benzotrithiophene-based COFs in the detection and removal of Ag + , providing a new strategy and alternative material for monitoring and controlling Ag + in drinking water.
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