APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Nan Li,Ying Wang,Chenren Wu,Wangyang Lu,Kemei Pei,Wenxing Chen
Enzymes have always been a source of inspiration for the design and improvement of catalysts. Many examples are occurring in heme/non-heme metalloenzymes with the generation of active high-valent metal-oxo intermediates that are controlled by the surrounding amino acids/protein and axial residue ligands, facilitating the efficient oxidation of substrates in biochemical processes. Here, the high-valent cobalt-oxo species have been formed during the heterolysis of H 2 O 2 activated by the bioinspired catalyst, axially coordinated cobalt phthalocyanine (CoPc) on pyridine-functionalized multi-walled carbon nanotubes (MWCNTs-Py), characterized by ultraviolet–visible and X-ray photoelectron spectroscopy. Formation process of the active cobalt-oxo species has been further confirmed by electrospray ionization mass spectrometry analysis and the results from the density functional theory (B3LYP/6-311G) calculations. Such high-valent cobalt-oxo species exhibit high reactivity and enough persistence for the oxidation of the target substrate, C.I. Acid Red 1. The oxidation products are nearly biodegradable small molecules identified by ultra-performance liquid chromatography/high-definition mass spectrometry. This strategy provides a foundation on developing efficient and persistent catalytic system, in particular oxidation processes based on the complex catalysts with N 4 macrocycle structures.
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Journal of Saudi Chemical Society
·
2024
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IF 5.8
Liang Guo,Shijin Zhou,Yanju Liu,Huaixia Yang,Mingsan Miao,Wei Gao
Herein, a sandwich electrochemical sensing strategy for aflatoxin b 1 (AFB 1 ) detection based on hybrid-nanoengineering was presented. First, Au nanoparticle was doped into zeolitic imidazolate framework-8 (ZIF-8) to form Au@ZIF-8 by in-situ growth method, followed by multi-walled carbon nanotubes (MWCNTs) addition to synthesize MWCNTs/Au@ZIF-8 via self-assembly. The structural “confinement effect” of ZIF-8 afforded a microenvironment for Au nanoparticles and SMCNTs in a certain spatial region, giving MWCNTs/Au@ZIF-8 excellent electrochemical property as the substrate material. In addition, Au-Pt bimetallic nanoparticle, which exhibited excellent stability and catalytic activity was loaded on the hollow cerium oxide (CeO 2 ) to form AuPt@CeO 2 nanoparticle through one-step aqueous phase reduction. Owning to its high surface-to-volume ratio, satisfied electron transfer efficiency and biocompatibility, massive toluidine blue (TB) and AFB 1 antibody (Ab) could be modified on the AuPt@CeO 2 to form AuPt@CeO 2 -Ab-TB, which acted as signal tag for the ultrasensitive assay of AFB 1 . The proposed electrochemical sensing system exhibited wide detection range (2 × 10 -5 − 20 ng/mL) and low detection limit (2.13 fg/mL), which has been successfully applied to AFB 1 determination in four real samples. The hybrid nanoengineering presented in this work is an active attempt to prepare high-performance substrate material and signal tag, which provides a new insight for the development of highly sensitive and specific electrochemical sensing systems.
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ACS Applied Materials & Interfaces
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2024
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IF 8.3
Xueyao Wang,Xuyang Hu,Zhengjun Qu,Ting Sun,Lihui Huang,Shimin Xu
Molybdenum disulfide (MoS2)-based materials for piezocatalysis are unsatisfactory due to their low actual piezoelectric coefficient and poor electrical conductivity. Herein, 1T/3R phase MoS2 grown in situ on multiwalled carbon nanotubes (MWCNTs) was proposed. MoS2@MWCNTs exhibited the interwoven morphology of thin nanoflowers and tubes, and the piezoelectric response of MoS2@MWCNTs was 4.07 times higher than that of MoS2 via piezoresponse force microscopy (PFM) characterization. MoS2@MWCNTs exhibited superior activity with a 91% degradation rate of norfloxacin (NOR) after actually working 24 min (as for rhodamine B, reached 100% within 18 min) by pulse-mode ultrasonic vibration-triggered piezocatalysis. It was found that piezocatalysis for removing pollutants was attributed to the synergistic effect of free radicals (•OH and O2•–) and nonfree radical (1O2, key role) pathways, together with the innergenerated-H2O2 promoting the degradation rate. 1O2 can be generated by electron transfer and energy transfer pathways. The presence of oxygen vacancies (OVs) induced the transformation of O2 to 1O2 by triplet energy transfer. The fast charge transfer in MoS2@MWCNTs heterostructure and the coexistence of sulfur vacancies and OVs enhanced charge carrier separation resulting in a prominent piezoelectric effect. This work opens up new avenues for the development of efficient piezocatalysts that can be utilized for environmental purification.
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PubMed
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Materials Science & Engineering C-Materials for Biological Applications
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2019
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IF 4.959
Cong Zhang,Jujie Ren,Yifei Xing,Min Cui,Na Li,Peng Liu,Xiaofang Wen,Meng Li
In this work, PdNPs@ZnO-Co 3 O 4 was synthesized via the facile oxidation treatment of bimetallic ZnCo-zeolitic-imidazolate-framework (ZnCo-ZIF) followed by in situ chemical reduction of PdNPs on the surface of the nanocrystals. After combined with MWCNTs, the PdNPs@ZnO-Co 3 O 4 -MWCNTs nanocomposites were formed, which were then exploited as novel electrode materials to construct the non-enzyme electrochemical sensors for high-sensitivity detection of tanshinol. Due to the high catalytic activity of multi-metallic PdNPs@ZnO-Co 3 O 4 , and the excellent charge transfer property between imidazole groups of the ligands in MOFs and MWCNTs, the obtained sensor exhibited high sensitivity for tanshinol detection under optimum experimental conditions. The sensor shows two well linear relationship between the current and tanshinol concentration in the range of 0.002–0.69 mM (R 2 = 0.989) and 0.69–3.75 mM (R 2 = 0.994) with the corresponding sensitivity of 59.16 μA mM − 1 and 19.08 μA mM − 1 . And the limit of detection (LOD) was calculated to be 0.019 μM (S/N = 3). Furthermore, with the advantages of good repeatability, stability and selectivity, the fabricated sensor can be successfully applied to measurement of tanshinol in real medicinal liquids samples. Our results would accelerate the applications of MOFs in electrochemical field and provide insights into design of multifunctional non-enzyme sensing materials for various applications in biocatalysis, bioanalysis and drug testing.
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MICROCHEMICAL JOURNAL
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2026
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IF 5.2
Kemiao Nan,Ran Jia,Weibo Feng,Shize Qu,Qi Shen,Yan Lin,Bing Zheng,Xiaodong Ma
Currently, the application of SPME techniques for multi-residue pesticide analysis is highly limited. In this study, a polypyrrole (PPy) doped with carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) in-tube solid-phase microextraction (IT-SPME) nanocomposite was designed and fabricated by the electrodeposition method. The preparation parameters, such as Py concentration and MWCNTs-COOH content, were optimized. The morphology and structure of the coating were evaluated using SEM and FT-IR which revealed a distributed coating with a coarse and fine grid-like structure, achieving the desired structural integration. Additionally, experimental factors affecting extraction efficiency were optimized, such as sample volume, eluent type, etc. This method indicated a great linear range of 1–500 μg L −1 and high correlation coefficients (R 2 ) above 0.9971. The limit of detection (S/N = 3) and quantification (S/ N = 10) were 0.12–1.27 μg L −1 and 0.41–4.22 μg L −1 . The relative standard deviations (RSDs) for intra-day and inter-day analyses were in the ranges of 1.02–12.17% and 3.10–13.15%, respectively. The method achieved satisfactory spiked recovery rates ranging from 80.34% to 103.23%. Furthermore, MWCNTs-COOH/PPy coating holds outstanding stability and selectivity. Therefore, the developed IT-SPME approach was successfully used in the analysis of actual environmental water samples.
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ACS Sensors
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2025
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IF 9.1
Zhihua Zhao,Shuhan Chen,Huiqin Li,Lan Wu,Zhigang Shao,Qilin Zou,Zhikun Wang
Triethylamine (TEA) is a colorless organic liquid known for its high volatility that poses significant irritation to the human respiratory tract; meanwhile, TEA can be released from decaying fish, which can be monitored by a gas sensor. However, conventional TEA gas sensors typically require high operating temperatures, leading to a substantial energy consumption. To address food safety concerns and promote environmental sustainability, the advancement of a TEA sensor that works at room temperature is urgently needed. In our work, an FeWO4/f-MWCNTs-3 chemoresistive gas sensor was fabricated by the hydrothermal method, integrating FeWO4 with multiwalled carbon nanotubes treated with mixed acids (f-MWCNTs). The sensor demonstrates superior performance, owing to its elevated specific surface area, total pore volume, and synergistic effect of p–p heterojunctions. FeWO4/f-MWCNTs-3 demonstrates excellent reproducibility, moisture resistance, stability, a minimal detection threshold of 1 ppm, and relatively rapid response/recovery times of 15/63 s. It attains a 113% response at 100 ppm of TEA at 25 °C. The applicability of FeWO4/f-MWCNTs-3 for assessing fish freshness via TEA concentration analysis from pomfret fish stored at ambient temperature for 14 days was validated, indicating its significance in fish freshness detection methodologies. Additionally, the gas-sensing mechanism of this sensor was further explored using density functional theory (DFT).
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COMPOSITES SCIENCE AND TECHNOLOGY
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2022
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IF 9.879
Shunge Wu,Ping Liu,Wei Tong,Junliang Li,Guangyuan Xu,Fei Teng,Jian Liu,Han Feng,Ruohai Hu,Austin Yang,Caixia Liu,Kun Xing,Xiaoping Yang,Helei Tian,Aiguo Song,Xiaoming Yang,Ying Huang
Flexible resistive sensors have attracted widespread attention in the field of wearable electronics . Inspired by the single-layer crack structure which has ultra-high sensitivity, a double strain layered crack structure is proposed to expand the maximum working strain (30%) of flexible sensor while maintaining the ultra-high sensitivity (GF = 2165 at 0–30% and 7381 at 25–30%). MWCNTs modified by 3-Aminopropyltriethoxysilane were filled into silicon rubber to form nanocomposites with fast response times (42 ms), high repeatability (>1000) and low hysteresis (7.08%). Furthermore, the respiratory rate, heart rate and blood pressure can be measured by the proposed sensor. The average errors of the respiratory rate and heart rate are less than 2% and 3% respectively. The mean error of systolic blood pressure, diastolic blood pressure and mean blood pressure is −0.0042 mmHg, 0.3730 mmHg, and 0.2472 mmHg respectively, meeting the standards of Association for the Advancement of Medical Instrumentation and A-level British Hypertension Society. This study shows that the proposed sensor has broad application prospects in high-precision wearable medical electronics.
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FOOD CHEMISTRY
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2021
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IF 7.514
Weiqiang Li,Kaisheng Diao,Daoyang Qiu,Yifang Zeng,Kaijie Tang,Yifu Zhu,Yingying Sheng,Yangping Wen,Mingfang Li
A new strategy to mimic antibody for electrochemical recognition and detection of deoxynivalenol (DON) using a highly-sensitive and selective antibody-like sensor based on molecularly imprinted poly( l -arginine) (P-Arg-MIP) on carboxylic acid functionalized carbon nanotubes (COOH-MWCNTs) was proposed. l -arginine as functional monomer was screened to prepare imprinted electrode via its electro-polymerization in the presence of DON onto the surface of COOH-MWCNTs electrode coupled with theoretical calculation. Surface morphology, structural characteristics, and electrochemical properties of P-Arg-MIP/COOH-MWCNTs were characterized by SEM, EDS, FTIR, and CV, respectively. P-Arg-MIP/COOH-MWCNTs displayed relatively high conductivity, high effective surface area, antibody-like molecular recognition and affinity, and a good response towards DON in a linear range from 0.1 to 70 μM with LOD of 0.07 μM in wheat flour samples with satisfactory recovery and feasible practicability in comparison with HPLC. This method provides a promising biomimetic sensing platform for the determination of mycotoxins in food and agro-products.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Bo Fu,Haicheng Chen,Zhihong Yan,Zhenying Zhang,Jincheng Chen,Tailin Liu,Kang Li
In this paper, a novel electrochemical sensor based on the combination of multi-walled carbon nanotubes and platinum nanoparticles (MWCNTs-PtNPs) as peroxidase mimics was developed for simultaneous detection of homovanillic acid (HVA) and vanillylmandelic acid (VMA) in human urine with excellent resolution, which were separated about 200 mV apart by electrochemistry . The modified electrode was investigated by different methods including electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Electrochemical studies show that MWCNTs-PtNPs modified GCE has an excellent separation performance for HVA and VMA with little overlapping, showing significant peroxidase mimetic oxidation catalysis . Under optimal conditions, the sensor exhibits good linear responses for HVA and VMA in the range of 2 × 10 −7 mol L −1 to 8 × 10 −5 mol L −1 and 5 × 10 −7 mol L −1 to 8 × 10 −5 mol L −1 with the detection limits of 8 × 10 −8 mol L −1 for HVA and 1.73 × 10 −7 mol L −1 for VMA (S/N = 3), respectively. Furthermore, MWCNTs-PtNPs/GCE was successfully applied to the simultaneous determination of HVA and VMA in human urine samples.
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WATER SCIENCE AND TECHNOLOGY
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2020
·Vol. 83
·期 2
·257-270
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IF 1.638
Qu Guangzhou,Wang Hui,Li Xin,Wang Tiecheng,Zhang Zengqiang,Liang Dongli,Qiang Hong
This paper presents a study of V and N co-doping TiO 2 embedding multi-walled carbon nanotubes (MWCNTs) supported on γ -Al 2 O 3 pellet (V/N-TiO 2 -MWCNTs/ γ -Al 2 O 3 ) composite photocatalyst induced by pulsed discharge plasma to enhance the removal of acid orange II (AO7) from aqueous solution. The photocatalytic activity of the V/N-TiO 2 -MWCNTs/ γ -Al 2 O 3 composite to AO7 removal induced by the pulsed discharge plasma was evaluated. The results indicate that the V/N-TiO 2 -MWCNTs/ γ -Al 2 O 3 composite possesses enhanced photocatalytic activity that facilitates the removal of AO7 compared with the TiO 2 -MWCNTs/ γ -Al 2 O 3 and TiO 2 / γ -Al 2 O 3 composites. Almost 100% of AO7 is removed after 10 min under optimal conditions. The V 0.10 /N 0.05 -TiO 2 -MWCNTs/ γ -Al 2 O 3 photocatalyst exhibits the best removal effect for AO7. Analysis of the removal mechanism indicates that the enhancement of the removal of AO7 resulting from V and N co-doping causes TiO 2 lattice distortion and introduces a new impurity energy level, which not only reduces the band gap of TiO 2 but also inhibits the recombination of the pairs. An efficient and easily recycled V/N-MWCNTs-TiO 2 / γ-Al 2 O 3 composite was prepared. Activity of the composite induced by discharge plasma to AO7 removal was evaluated. Synergistic effect of discharge plasma and catalyst effectively improve AO7 removal. The composite demonstrates adequate recycling performance in a discharge plasma system. Possible mechanisms of AO7 removal were analyzed.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Ming Sui,Yanni Huang,Yang Tang,Jiaoyang Luo,Yiyang Dong,Yifei Guo,Yonggui Ma,Wei Gu,Mengyue Guo,Jingdan Huang,Dandan Kong,Jinping Li,Meihua Yang
Medicinal teas (MT) were popular in Asian countries for its various effective components. However, Pb pollution poses a serious threat to MT consumption due to the irreversible effect on enzyme activity and neurodegenerative disease. Owing to its toxicity and matrix interference, a rapid screening method for Pb at trace level with high sensitivity and accuracy is urgent for MT consumers. Herein, a simple and ultra-sensitive AuNPs/MWCNTs-MB/DNA-GCE quadruplex biosensor was developed and investigated. Specifically, the monitoring technology of scanning electrochemical microscope was utilized to analyze the assembly and application process for screening key parameters in complex matrix , through in-situ characterization of the microstructure changes on stepwise modified sensors. According to the combined results of electrochemical test and Randles-Sevcik equation, the proposed sensor showed a wide linear range from 5.0 * 10 −15 to 5.0 * 10 −13 M with LOD of 0.9 fM. In addition, the optimized sensor exhibited an excellent selectivity under the inference of metals and medicinal components. The proposed biosensor was successfully implemented for the ultrasensitive monitoring Pb pollution in MT while its water infusions recoveries maintained within acceptable range (81–118 %, 82–129 %). In all, AuNPs/MWCNTs-MB/DNA-GCE provided a new insight into the design, optimization, application and mechanism analysis of sensor for reliable sensing in controlling MT pollution and consumption safety.
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ADVANCED FUNCTIONAL MATERIALS
·
2026
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IF 19.9
Bin Zhang,Ye Pei,Quan Wan,Yuhang Huang,Shuo Liu,Tao Yuan,Taolei Sun,Guanbin Gao
Synergistic radar-infrared dual-band camouflage is severely restricted by an inherent contradiction between microwave-derived heat release and thermal insulation, while conventional monolithic high-entropy alloys suffer from high density and poor impedance matching for integrated stealth applications. Herein, soybean-shaped and high-aspect-ratio rice-shaped FeCoNiCuMn high-entropy alloys are in situ anchored onto multi-walled carbon nanotube networks via pressure-regulated hydrothermal synthesis, yielding ultralight aerogels with an ultra-low density of 0.014 g·cm −3 . Optimized rice-structured aerogel delivers a broad effective absorption bandwidth of 5.13 GHz at merely 2.00 mm thickness, a minimum reflection loss of −70.01 dB, and an exceptional specific reflection loss of 419.2, surpassing most reported analogs. CST simulations verify 11.60 dB·m 2 radar cross-section reduction, guaranteeing outstanding radar stealth for unmanned aerial vehicle coatings. Impressively, the optimized rice-like HEAAs composite synchronously achieves ∼30 dB electromagnetic shielding, favorable infrared camouflage, fire retardancy and thermal insulation. Mechanism analysis confirms the high-aspect-ratio configuration constructs continuous conductive pathways and abundant heterogeneous interfaces to harmonize dielectric dissipation and impedance matching. This morphology-tuning strategy guides the design of next-generation multifunctional absorbers for harsh aerospace environments.
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危险品化学品经营许可证（带存储）