APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yunhong Pi,Shuo Jin,Xiyi Li,Shi Tu,Zhong Li,Jing Xiao
Constructing advanced heterojunction structures is an effective approach to improve light utility and enhance photogenerated charge separation and transfer for solar energy conversion. Herein, we reported a MWCNT@MOF-derived In 2 S 3 hollow tube heterostructure via facile MOF sulfidation process, significantly boosting its photocatalytic degradation performance of tetracycline (TC) under visible light irradiation. The MWCNT bonds to the In 2 S 3 hollow tube strongly to construct an effective heterojunction, as illustrated in TEM and Raman spectroscopy. The 0.3%-MWCNT@MOF-derived In 2 S 3 exhibited the highest photocatalytic activity for visible-light-driven TC degradation, achieving ˜100% degradation efficiency, with its apparent reaction rate constants 3–5 times higher than that of the pure MOF-derived hollow In 2 S 3 and traditional In 2 S 3 bulk. The boosted visible-light-driven degradation efficiency was attributed to the synergy between electron acceptor of MWCNTs for enhanced separation of charge carriers and active center of MOF-derived In 2 S 3 hollow tube with shorter transfer distance of charge carriers, which not only promotes the carrier transfer and inhibits the recombination rate effectively, but also improves the visible light response. Such MOF-derived visible-light-active heterostructures thus provide a novel insight into the development of highly efficient photocatalyst for a wide usage.
研究领域:
材料科学
·
环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2023
·
IF 8.9
Manli Lu,Junyu Chi,Huijuan Chen,Zongxu Liu,Pengfei Shi,Zheng Lu,Liang Yin,Lulu Du,Li Lv,Pinhua Zhang,Kaifeng Xue,Guangliang Cui
Developing a respiratory analysis disease diagnosis platform for the H2S biomarker has great significance for the real-time detection of various diseases. However, achieving highly sensitive and rapid detection of H2S gas at the parts per billion level at low temperatures is one of the most critical challenges for developing portable exhaled gas sensors. Herein, Cu2O-multiwalled carbon nanotube (MWCNT) heterostructures with excellent gas sensitivity to H2S at room temperature and a lower temperature were successfully synthesized by a facile two-dimensional (2D) electrodeposition in situ assembly method. The combination of Cu2O and MWCNTs via the principle of optimal conductance growth not only reduced the initial resistance of the material but also provided an ideal interfacial barrier structure. Compared to the response of the pure Cu2O sensor, that of the Cu2O-MWCNT sensor to 1 ppm of H2S increased nearly 800 times at room temperature, and the response time decreased by more than 500 s. In addition to the excellent sensitivity with detection limits as low as 1 ppb, the Cu2O-MWCNT sensor was extremely selective with low-temperature adaptability. The sensor had a response value of 80.6 to 0.1 ppm of H2S at −10 °C, which is difficult to achieve with sensors based on oxygen adsorption/desorption mechanisms. The sensor was used for the detection of real oral exhaled breath, confirming its feasibility as a real-time disease monitoring sensor. The Cu2O-MWCNT heterostructures maximized the advantages of the individual components and laid the experimental foundation for future applications of highly sensitive portable breath analysis platforms for monitoring H2S.
研究领域:
材料科学
·
医学诊断
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYST
·
2021
·Vol. 147
·期 2
·303-311
·
IF 4.616
Chao Chen,Chenxi Wang,Pengcheng Zhao,Jin Zhang,Dechong Ma,Junjie Fei
First, the nanocomposite Au@rGO-MWCNT was synthesized by a hydrothermal method. Next, a temperature-controlled composite sensing film was prepared by composite modification of poly(2-(2-methoxyethoxy)ethyl methacrylate) (PMEO2MA) and Au@rGO-MWCNT on a glassy carbon electrode (GCE). This sensor was shown to exhibit good temperature sensitivity and reversibility to dopamine. When the testing temperature is lower than the lower critical solution temperature (LCST) of the polymer, the PMEO2MA chain is in a stretched state, which increases the distance between the Au@rGO layers and leads to the inability of MWCNTs in one layer to contact another Au@rGO layer and to low conductivity. Therefore, in this state, dopamine cannot detect an electrochemical signal, and it is termed an “off” state. When the temperature is higher than the LCST of the polymer, the PMEO2MA chain shrinks, allowing the MWCNTs to make contact with another layer of Au@rGO; the electron transfer rate of the modified film increases, and the electrochemical behavior of dopamine turns to an “on” state. Moreover, the sensor has a wide detection range (0.1 to 9.0 μM and 9.0 to 239.0 μM), and the limit of detection of dopamine is as low as 30 nM. This method has been successfully applied to the determination of dopamine in human serum samples. The on–off sensor provides a new avenue for the application of temperature-sensitive polymers.
研究领域:
生物传感
·
分析化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
·
2024
·
IF 1.2
Xiaoli Ji,Zhihao Xu,Jian Liu,Ruochen Qiao,Haoze Yuan
MWCNT/Fe3O4/Si3N4 composite was synthesized via hydrothermal synthesis. The morphology and structure of MWCNT/Fe3O4/Si3N4 were investigated by means of SEM, XPS, XRD, and FT-IR. Their electromagnetic parameters were measured by a vector network analyzer. The microwave attenuation properties of as-synthesized composite could be modulated by regulating the feed ratio of MWCNT, Fe3O4, and Si3N4. According to the different amounts of modified nano Fe3O4 added, they are labelled as S1-S3. When the feed ratio is 3:15:20, the maximum reflection loss value of the sample is −23.3 dB at 14.4 GHz, the corresponding thickness is 2.5 mm, and the corresponding effective absorption bandwidth is 5.36 GHz. Moreover, the test results of the thermogravimetric analyzer show that the composite material has excellent heat resistance. Our research results provide a reference value for the development of excellent heat resistance and high-performance MWCNT-based microwave absorption composite materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 59
·37194-37204
·
IF 3.361
Muqun Wang,Yuxuan Qin,Wei Gao,Shaofeng Liang
With the rapid increase of intelligent communication equipment, electromagnetic pollution is becoming more and more serious, and the research and application of high-performance electromagnetic shielding materials have attracted great attention from the academic and engineering circles. Traditional metal-based electromagnetic shielding materials have high reflection loss, high density, and are difficult to process. Polymer-based materials with carbon materials as fillers have the advantages of flexibility, light weight, corrosion resistance and low processing costs. They have become the most important materials in the field of electromagnetic shielding in recent years. However, the conductivity of conductive polymer materials is not high. Therefore, improving the electromagnetic shielding performance and the proportion of absorption loss under low density conditions have become key issues for polymer-based electromagnetic shielding materials. MWCNT/MCHMs/WPU composites were prepared by a solution mixing method, with 20 wt%, 40 wt%, 60 wt% MWCNTs and 40 wt% MWCNT/10 wt% MCHMs as fillers. By comparing the effects of different MWCNT content and MCHMs on the dielectric properties, electromagnetic shielding properties and mechanical properties of the MWCNT/MCHMs/WPU composites, the relationship between the structure and properties of the composites has been explored. The 0.6 mm WPU/60 wt% MWCNT composite has an electrical conductivity of 95.4 S m−1 and an electromagnetic shielding effectiveness of 40 dB in the X band. Adding 10 wt% MCHMs to the WPU/40 wt% MWCNT composite material can significantly improve the composite. The δ of the material increased from 51.2 S m−1 to 55.4 S m−1, and the SE increased from 30 dB to 33 dB. The research results show that the increase in MWCNT content and MCHMs is beneficial to improving the electrical conductivity and electromagnetic shielding performance of the composite materials.
研究领域:
材料科学
·
电磁学
·
聚合物科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2022
·
IF 11.307
Shaojun Wu,Hongliang Hou,Xiang Xue
Microwave absorption materials can effectively eliminate harmful electromagnetic radiation to protect humanity, but it still remains challenging to attain absorbers with quad-band compatible strong absorption to date. Herein, MoO 3-x @MWCNT with tunable morphologies was fabricated via a facile one-step hydrothermal route and their microwave absorption properties in different frequency bands were systematically investigated, along with the multifunctional properties. The absorbers with a hollow hexagonal prism and cauliflower-like morphologies can be tailored by changing the hybrid ratios of MoO 3-x rich in vacancy defects and defective MWCNT from 5:1 (S1), 6:1 (S2) to 7:1 (S3), contributing to quad-band absorption (S-, C-, X- and Ku-bands) with maximum effective absorption bandwidth of 3.68 GHz for S2 and tri-band absorption (S-, X- and Ku-bands) with maximum effective absorption bandwidth of 4.67 GHz for S3, and optimal reflection loss can reach −62.23 dB when a compound ratio of 30% is satisfied in S3/paraffin. The conspicuous quad-band absorption and reflection loss are manipulated by the synergetic effects of multiple factors including porous structures , numerous defects and heterogeneous interfaces, etc. Additionally, remarkable fire-retardancy, photothermal de-icing and antibacterial performance of synthesized MoO 3-x @MWCNT-based absorbing coating are expected to deliver solutions for complex communication and detection in the military and civil fields.
研究领域:
材料科学
·
电磁学
·
功能材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2015
·Vol. 3
·期 9
·2006-2011
·
IF 4.726
Na Li,Yaoguang Wang,Wei Cao,Yunhui Zhang,Tao Yan,Bin Du,Qin Wei
The excellent catalytic activity of a novel nanomaterial was introduced to ultrasensitive sandwich-type electrochemical immunosensor applications for detection of carcinoembryonic antigen (CEA). Amino-functionalized multi-walled carbon nanotube (MWCNT-NH2) supported PdPt nanocages were used as catalytic labels of secondary anti-CEA. PdPt nanocages with hollow interiors and porous walls could efficiently enhance electrocatalysis for reduction of H2O2. Meanwhile, with good dispersion, large specific surface area and amino groups, MWCNT-NH2 can immobilize a large amount of PdPt nanocages to improve the sensitivity and amplify the signal of the immunosensor. For the immobilization of primary antibodies, 3-aminopropyltriethoxysilane functionalized graphene sheets were used as transducing materials to modify glassy carbon electrodes and to enhance the electron transfer efficiently. Under the optimal conditions, the electrochemical immunosensor exhibited a wide linear range of 0.001–20 ng mL−1 with a low detection limit of 0.2 pg mL−1 for CEA. The proposed sensing strategy enriches electrochemical immunoassays and may have a promising application in bioassay analysis.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 11
·4950-4962
·
IF 3.591
Chengcong Wang,Lijuan Zhang,Haikuan Yuan,Yujia Fu,Zheng Zeng,Jie Lu
In this study, perfluorosulfonic acid (PFSA) was firstly grafted on multi-walled carbon nanotubes (MWCNTs) to obtain PFSA-g-MWCNT nanocomposites. The combination of MWCNTs with PFSA effectively prevents the interactions among them, so that the dispersion of PFSA-g-MWCNTs in N,N-dimethylacetamide (DMAc) was greatly improved. Then, polyethersulfone (PES)/PFSA-g-MWCNT ultrafiltration (UF) membranes were prepared via a non-solvent induced phase separation (NIPS) method using different contents of PFSA-g-MWCNT nanocomposites as additives. The nanocomposites and membranes were characterized using techniques including Fourier-transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy (SEM). The SEM images show that the PFSA-g-MWCNTs no longer agglomerate and entangle, and exist as individual nanotubes in the PES/PFSA-g-MWCNT membrane. The mechanical and thermal properties of the composite membranes were enhanced with the increasing PFSA-g-MWCNT nanocomposite content. The performance of the UF membrane was evaluated using bovine serum albumin (BSA) as a model system. The results show that the permeation and antifouling performances of the PES/PFSA-g-MWCNT membranes were enhanced. For example, the pure water flux, BSA rejection and pure water flux recovery rate of the PES (M0) membrane were 80.49 L m−2 h−1, 86.29%, and 70.96%, respectively, while for the PES/PFSA-g-MWCNT (M6) membrane, they were 447.83 L m−2 h−1, 87.47%, and 92.10%, respectively. Long-term stability experiments show that the PES/PFSA-g-MWCNT membrane still maintains a high pure water flux.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 51
·29455-29463
·
IF 2.936
Hai-Zhen Zhang,Zhen-Liang Xu,Jing-Ying Sun
Nanofiltration (NF) membranes with simultaneous high rejection of divalent cations and anions and high water permeation were designed and fabricated via interfacial polymerization (IP) on three-channel capillary ultrafiltration (UF) membranes. MWCNTs-COOH were modified with poly(amidoamine) (PAMAM) and the as-synthesized MWCNTs-PAMAM were embedded into the inner polyamide skin-layer of the NF membranes by incorporating them into a piperazine (PIP) aqueous solution, followed by IP with trimesoyl chloride (TMC). The rigid MWCNTs and the dendrimer PAMAM molecules endow the as-fabricated NF membranes with high porosity and good hydrophilicity. Additionally, the –NH2 groups of PAMAM introduce some positive sites into the polyamide layer. The as-prepared NF membranes with incorporated MWCNTs-PAMAM exhibit a pure water flux of 48.7 L m−2 h−1 and 92.6% and 88.5% rejection for Na2SO4 and MgCl2, respectively, at 4 bar. Moreover, the NF membranes display high rejection for sulfates and metal cations, including heavy metal ions. The practicability of the membranes for mine-wastewater treatment was tested, and the membranes showed above 80% rejection of heavy metals and solution flux of about 30 L m−2 h−1. In addition, their separation performance and stability were satisfactory during the long-term run. The high rejection of the membranes for metal cations is ascribed to the positive sites offered by MWCNTs-PAMAM and the narrow membrane pores since both electrostatic repulsion and size exclusion play a role during membrane filtration. The good separation performance of the membranes for multivalent anions and heavy metal cations illustrates their potential for applications in heavy metal wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yuan Jin,Tianyu Wang,Junyuan Song,Yafeng Zhang,Wenyan Guo,Guangli Li
Marbofloxacin (MAR) has been extensively used in both clinical and agricultural sectors to combat bacterial infections. Despite its therapeutic uses, MAR residues persist in the environment, causing serious adverse effects on human health and ecosystems. Therefore, developing a facile but reliable approach for the determination of MAR is of paramount importance. Herein, a sensitive electrochemical sensing platform was established for the determination of trace amounts of MAR using ZrMo 2 O 8 /carboxylated multiwalled carbon nanotubes (MWCNT-COOH). The synergistic effect between the catalytic ZrMo 2 O 8 and the conductive MWCNT-COOH generate numerous active sites and enhanced electron transfer, significantly boosting peak current response of MAR. As consequence, the ZrMo 2 O 8 /MWCNT-COOH exhibited remarkably catalytic activity toward MAR oxidation over a wide concentration range (0.01−10 μM), with an ultrahigh sensitivity (7.640 μA μM −1 ) and a low detection limit (0.002 μM). The ZrMo 2 O 8 /MWCNT-COOH showcased the strong anti-interfering ability against the excess of potential interfering substances, and could record stable response peak current for at least 15 days. MAR concentrations in veterinary drug tablets and livestock effluent were accurately quantified by using the ZrMo 2 O 8 /MWCNT-COOH/GCE with good recovery. Considering its attractive merits including low cost, ultrahigh sensitivity, and strong anti-interfering ability, the ZrMo 2 O 8 /MWCNT-COOH/GCE demonstrates promising prospects on the trace determination of MAR residues in various complicated matrices.
研究领域:
分析化学
·
环境科学
·
药物分析
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 10
·1-9
·
IF 2.983
Zhang Yawen,Ding Huizhen,Yan Bin,Lin Pei,Wu Di,Shi Zhifeng,Chen Xu,Tian Yongtao,Li Xinjian
Recently, highly flexible strain sensors have been widely studied based on the conductive polymer composites, due to their potential applications in wearable electronics, soft robots, and human–machine interfaces. Herein, we fabricate the flexible MWCNT line/Ecoflex strain sensors by 3D printing technology to investigate the effects of preparation conditions on the performance of sensors, and find that gage factor (GF) of such sensors is effected by concentration of MWCNT/IPA solution and curing time of Ecoflex pre-polymer film. Among the obtained samples, the sensor prepared by 2 wt% MWCNT/IPA solution with curing time of 12 min has the highest gage factor, about ~ 23.87. The sensors can detect or monitor subtle motions of facial muscle, breath and pulse, and possess wide linear range besides good repeatability and excellent durability. Meanwhile, the prepared sensors were designed into a 4 × 4 array, and the array achieved monitoring of spatial distribution of the applied pressure. Our strategy could be used to fabricate flexible strain sensors with wide linear range, which facilitate further integration to achieve potential applications in detection of human activity, electronic skin, and soft robots.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Huan Xing,Xin Li,Yanli Lu,Yue Wu,Yan He,Qingmei Chen,Qingjun Liu,Ray P.S. Han
Humidity sensing-based wearable respiration monitoring systems have promising application prospects in providing the critical health information. Currently, due to the inherent flexibility and compatibility, fabric-based wearables have attracted tremendous interest in humidity sensing. Herein, we proposed a humidity sensor made from fabric coated with MXene and multi-walled carbon nanotubes (MWCNT). The sensor showed 265% response at 90% relative humidity (RH) and great response stability under deformation. The humidity response of MXene/MWCNT fabric (MC-fabric) sensor only varied 7% under stretch, which is greatly alleviated compared with pristine MXene fabric sensor (35% under stretch). The MC-fabric sensor, integrated into a mask, can accurately identify diverse human respiration patterns despite the deformation caused by motions. This work not only offers a facile modification strategy to enhance the sensing robustness under deformation, but also provides a feasible method for real-time breath analysis.
研究领域:
材料科学
·
生物医学工程
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）