BIOSENSORS & BIOELECTRONICS
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2015
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IF 6.409
Dan Wu,Xiang Ren,Lihua Hu,Dawei Fan,Yang Zheng,Qin Wei
A highly sensitive electrochemical adenosine aptasensor was fabricated by covalently immobilizing 3′-NH 2 -terminated capture probe (SSDNA1) and thionine (TH) on Au–GS modified glassy carbon electrode. 3′-SH-terminated adenosine aptamer (SSDNA2) was adsorbed onto palladium/copper alloyed supported on MWCNTs ( [email protected] )-conjugated multiple bienzymes, glucose oxidase (GOx), and horseradish peroxidase (HRP) (SSDNA2/ [email protected] /HRP/GOx). Then, it was immobilized onto the electrode surface through the hybridization between the adenosine aptamer and the capture probe. The signal was amplified based on the gradual electrocatalytic reduction of GOx-generated hydrogen peroxide by the multiple HRP through the mediating ability of the loaded multiple TH. However, the peak current of TH decreased in the presence of adenosine because the interaction between adenosine and its aptamer made SSDNA2/ [email protected] /HRP/GOx release from the modified electrode . Various experimental parameters have been optimized for the detection of adenosine and tests for selectivity , reproducibility and stability have also been performed. Under the optimal condition, the proposed aptasensor displayed a wide linear range (10–400 nM) with the low detection limit (2.5 nM), which has been applied in human serum samples with satisfactory results. Thus, the combination of Au–GS as a sensor platform and [email protected] /HRP/GOx as labels can be a promising amplification strategy for highly sensitive adenosine detection.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2013
·
IF 3.535
Jing Dong,Xindong Wang,Fengmin Qiao,Pei Liu,Shiyun Ai
A novel multi-walled carbon nanotubes–CeO 2 –Au nanocomposite (MWCNTs–CeO 2 –Au) was synthesized by a facile two-step precipitation method and used for solid-phase extraction of methyl parathion (MP). The MWCNTs–CeO 2 –Au nanocomposite combined the individual properties of MWCNTs (high conductivity and exceptional adsorption affinity) and nanoparticles (high surface area and special catalytic activity), and realized the efficient enrichment and electrochemical stripping voltammetric detection of MP. An ultra-low detection limit of 3.02 × 10 −11 M for MP was obtained at MWCNTs–CeO 2 –Au nanocomposite modified electrode , suggesting the high sensitivity of the nanocomposite based electrochemical sensor . Moreover, the proposed electrochemical sensor was successfully employed for the determination of MP in water and soil samples.
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CATALYSIS TODAY
·
2017
·
IF 4.636
Yajing Huang,Wenjun Xu,Lingling Hu,Jiawei Zeng,Chun He,Xiuqin Tan,Zhuoyan He,Qiong Zhang,Dong Shu
MWCNTs/Fe 3 O 4 magnetic composites, combined adsorption and catalytic ozonation behavior, were synthesized by a hydrothermal process. The synthesized MWCNTs/Fe 3 O 4 composites were characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), element analysis and Brunauer-Emmett-Teller (BET) surface area. The adsorption performance and catalytic activity of MWCNTs/Fe 3 O 4 for BPA removal in aqueous solution were evaluated. The results showed that the synthesized MWCNTs/Fe 3 O 4 exhibited an excellent adsorption ability and catalytic ozonation activity owning to its large specific surface areas, hollow tube channels and abundant surface oxygen-containing groups, leading to high adsorption for BPA and O 3 , high retention and utilization of O 3 molecules on the composites. In addition, the catalytic ozonation performance of MWCNTs/Fe 3 O 4 could be improved by increasing surface oxygen-containing groups to accelerate O 3 decomposition, thus producing more OH radicals. Moreover, BPA removal efficiency could be improved by increasing dose of catalyst, pH value and the concentration of humic acid (HA). The fluorescence spectra and OH radicals measurement displayed that HA could greatly increase OH radicals via inducing more surface oxygen-containing groups on the catalyst, thus, promoting BPA removal. Furthermore, MWCNTs/Fe 3 O 4 showed the great stability and durability during several reaction recycles.
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THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Bin Xu,Boyi Wang,Caixia Zhang,Jing Zhou
In this study, we adopted the organic precursor thermal decomposition method to prepare Cu 2 O-Cu-MWCNTs/paraffin light-thermal conversion phase change material via one-step. The phase, micro morphology, phase change behavior, thermal reliability and thermal stability of the products were respectively characterized by XRD, SEM, DSC and TGA. We also investigated their light-thermal conversion properties. The results indicated when the content of precursor was 0.005 mol and 0.01 mol, the average particles size of hybird particles (Cu and Cu 2 O) were 30 nm and 400 nm, respectively. It was also found that the light-heat conversion performance of Cu 2 O-Cu-MWCNTs/paraffin were better than that of MWCNTs/paraffin with the same mass fraction. After we conducted analyses of UV–vis diffuse reflection spectra and thermal conductivity, We attributed the better light-heat conversion performance of Cu 2 O-Cu-MWCNTs/paraffin to the high light absorption ability of Cu 2 O and the reduction of interface thermal resistance between MWCNTs and paraffinresulting from Cu and Cu 2 O decorated MWCNTs.
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Nanoscale
·
2017
·Vol. 9
·期 6
·2178-2187
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IF 7.367
Xueqin Li,Changlong Hao,Bochong Tang,Yue Wang,Mei Liu,Yuanwei Wang,Yihua Zhu,Chenguang Lu,Zhiyong Tang
Due to their high specific surface area and good electric conductivity, nitrogen-doped porous carbons (NPCs) and carbon nanotubes (CNTs) have attracted much attention for electrochemical energy storage applications. In the present work, we firstly prepared MWCNT/ZIF-8 composites by decoration of zeolitic imidazolate frameworks (ZIF-8) onto the surface of multi-walled CNTs (MWCNTs), then obtained MWCNT/NPCs by the direct carbonization of MWCNT/ZIF-8. By controlling the reaction conditions, MWCNT/ZIF-8 with three different particle sizes were synthesized. The effect of NPCs size on capacitance performance has been evaluated in detail. The MWCNT/NPC with large-sized NPC (MWCNT/NPC-L) displayed the highest specific capacitance of 293.4 F g−1 at the scan rate of 5 mV s−1 and only lost 4.2% of capacitance after 10 000 cyclic voltammetry cycles, which was attributed to the hierarchically structured pores, N-doping and high electrical conductivity. The studies of symmetric two-electrode supercapacitor cells also confirmed MWCNT/NPC-L as efficient electrode materials that have good electrochemical performance, especially for high-rate applications.
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Zhimin Li,Dongming He,Yimin Zhou,Zi-Yu Zhang,Zhongai Hu,Xiaoquan Lu
Nonylphenol (NP) is an important fine chemical raw material and intermediate that is widely utilized in industry and may be distributed in aquatic ecosystems. Following its entry into the food and water cycles, it can subsequently enter the human body and potentially harm the human reproductive system. For the purpose of monitoring NP in water, it is thus essential to build a straightforward, affordable, and robust electrochemical sensor. Based on a two-step chemical modification proceeding and an electrostatic self-assembly effect, a double-modified β-cyclodextrin functionalized multiwalled carbon nanotube sensor (HE-β-CD-CTAC/F-MWCNTs) has been successfully constructed. It incorporates the excellent host–guest interaction ability of β-cyclodextrin and the high chemical activity of cetyltrimethylammonium chloride (CTAC), and the carbon nanotubes have an enormous particular surface area and strong electrical conductivity. The electrochemical oxidation reaction of NP with the sensor is controlled by a surface adsorption process of equal numbers of protons and electrons. In accordance with the optimized experimental parameters, the limit of detection (LOD) for the sensor is 0.13 μM, and it responds linearly to NP in the concentration range of 1–200 μM. Meanwhile, the sensor has excellent repeatability, stability, and immunity to interference. For the detection of NP in real water samples, the sensor also showed an excellent recovery rate (92.8%–98.5%) and relative standard deviation (1.16%–3.26%).
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xinyue Liang,Xiaolong Yao,Sijie Chen,Wei Wang,Hong Zhu,Qingwei Bu,Zheng Liu
The highly toxic and recalcitrant organic pollutant, 2,4-dichlorophenol (2,4-DCP), is commonly found in wastewater. Therefore, it is critical to investigate novel techniques for the efficient removal of 2,4-DCP from wastewater. The present study employed a one-step synthesis method to fabricate ZIF-8/multi-walled carbon nanotubes (ZIF-8/MWCNTs) nanocomposites with well-defined mesoporous structures, which were subsequently coated onto carbon cloth (CC) to form the anode ZIF-8/MWCNTs/CC. Subsequently, the adsorption performance of ZIF-8/MWCNTs toward 2,4-DCP and the adsorption-electrochemical degradation performance of ZIF-8/MWCNTs/CC toward 2,4-DCP were investigated. ZIF-8/MWCNTs exhibit exceptional adsorption capacity and rate toward the 2,4-DCP. At 303 K, it achieved a saturated adsorption amount as high as 1056.78 mg·g - 1 within only 30 min of reaching equilibrium. Moreover, when coated on CC substrates, the internal pore structure of ZIF-8/MWCNTs is effectively exploited during the adsorption. In addition, the incorporation of MWCNTs enhances the conductivity of the ZIF-8/MWCNTs/CC electrodes, leading to reduced resistance and improved electron transfer rate. Notably, ZIF-8/MWCNTs/CC enabled complete removal of a 25 mg·L -1 solution of 2,4-DCP within only 90 min and a 50 mg·L -1 solution within 120 min. Furthermore, the degradation mechanism of 2,4-DCP was analyzed by means of DFT modeling theoretical calculations and intermediate product determination analysis, while evaluating the toxicity of the generated material was evaluated. This study provides improved solutions and strategies for the treatment of chlorophenolic compound pollution in wastewater.
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Thermal Science and Engineering Progress
·
2025
·
IF 5.4
HaoMing Huang,Shan Qing,XiaoHui Zhang,ChengHang Li,Jing Zhang,Ying Zhang,Xi Wang
Nanofluids (NFs) are considered advanced heat transfer fluids due to their enhanced thermal conductivity, improved heat transfer efficiency, energy-saving potential, and prospects for system miniaturization. However, the development of NFs faces challenges, as traditional single-component NFs often suffer from poor stability, limited thermal conductivity improvement, and high viscosity, which hinder their practical application. Herein, we prepared multi-walled carbon nanotubes (MWCNTs)-TiO 2 /H 2 O NFs via a two-step method and investigated the regulatory effects of temperature (20 °C-80 °C) and mass ratio (10:1-1:10) on their dispersion stability, thermal conductivity, and viscosity characteristics. It turned out that MWCNTs and TiO 2 nanoparticles formed an interfacial coupling structure through physical adsorption. This structure was mediated by the preferential anchoring of TiO 2 nanoparticles onto the surface-active sites of MWCNTs, which effectively suppressed particle agglomeration and ensured dispersion stability of the MWCNTs-TiO 2 /H 2 O NFs. The MWCNTs-TiO 2 /H 2 O NFs with a mass ratio of 1:2 demonstrated optimal performance enhancement ratios (PER) by reducing viscosity loss and significantly improving thermal conductivity within the temperature range. Comparative studies with single-component NFs revealed that this hybrid NFs exhibited significant advantages in both thermal conductivity and viscosity performance, further confirming the synergistic optimization effect between the MWCNTs and TiO 2 nanoparticles. Our work reveals the core role of the interface coupling mechanism between MWCNTs and TiO 2 nanoparticles in optimizing the thermal transport performance of NFs, providing a theoretical basis for the development of efficient heat transfer systems based on synergistic effects.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Chun-Hao Chang,Peng-Fei Qian,Ze-Long Bao,Tong-Yu Li,Yu-Long Guo,Ke Hu,Bao-Hui Shao,Wen-Hao Geng,Di Zhang,Hong-Zhang Geng
With the development of 5G communication technology, electronic devices face the challenge of performance fluctuations when exposed to temperature-varying environments and multiband electromagnetic radiation. Addressing the limited performance of single-component materials, this article proposes a design strategy for synergistically enhanced composite films. Through the synergistic effects of multiple components and the regulation of multidimensional structures, the performance limitations of functional materials are overcome. In this work, a hierarchical aramid nanofiber (ANF)/silver nanowire (AgNWs)/multiwalled carbon nanotube (MWCNTs)-poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composite film was fabricated via stepwise vacuum filtration. The bottom-layer ANF provides robust mechanical stability, and AgNWs in the interlayer form the primary conductive network. The top-layer MWCNTs-PEDOT:PSS with a “reinforced-concrete” structure significantly enhances the interfacial adhesion between AgNWs and ANF layers. This architecture fills conductive network gaps, creates additional pathways, and retards AgNWs’ oxidation effectively. The composite film retains excellent mechanical properties with a tensile strength of 231.67 MPa. It exhibits a rapid electrothermal response, reaching 122 °C from room temperature within 15 s under a low voltage of 4 V. Meanwhile, its electromagnetic interference (EMI) shielding effectiveness in the X-band reaches 35.57 dB. It overcomes the performance limitations caused by uneven dispersion of traditional fillers and poor interfacial adhesion. These advantages endow it with great potential in various fields, such as smart wearable devices, aerospace engineering, flexible electronics, and medical applications.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2021
·Vol. 21
·期 4
·2254-2258
·
IF 0
Chen Xiao,Liu Tao,Feng Chuanqi
Germanium (Ge) nanoparticles/multiwalled carbon nanotubes (Ge/MWCNTs) composite is synthesized by solvothermal method combined with heat treatment under H2 atmosphere. The Ge particles are buried in MWCNTs network to form expected composite. The MWCNTs not only improve the
conductivity of the composite but also act as a flexible matrix to buffer the volume change of germanium nanoparticles during the process of insertion and de-insertion in lithium ion battery system. The Ge/MWCNTs composite behaves better cycle performance and higher rate capability than those
of pure germanium (Ge) nanoparticles. The Ge/MWCNTs maintained discharge capacity as 1040 mAh·g-1 after 60 cycles at the current density of 100 mA·g-1. It is a promising anode material for lithium ion battery application.
研究领域:
材料科学
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电化学
·
纳米技术
·
能源存储
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PubMed
BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
·
2020
·Vol. 68
·期 6
·1192-1201
·
IF 1.638
Lingqiang Meng,Jianmin Dai,Shengzhong Rong,Hongmin Gao,Ze Zhang,Yingcong Zhang,Dong Chang,Hongzhi Pan
In our work, one-step electro-deposition method was adopted to produce polyaniline (PANI) and functional multiwalled carbon nanotubes (f-MWCNTs) films on glass carbon electrodes, and the modified electrodes were applied as an electrochemical sensor for determination of 10-hydroxycamptothecine (10-HCPT). The f-MWCNTs were handled by ultrasound processing in concentrated oxidizing acid solution, which can obtain a wonderful dissolution in water and attach new functional groups, such as –COOH and –OH. Then, aniline monomer could polymerize on the surface easily. The surface characterization was investigated using various techniques including scanning electron microscope, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction, and electro-catalytic properties were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. Under optimal conditions, the resulting of PANI/f-MWCNTs sensor showed a wide linear range (3 × 10 −9 to 7 × 10 −7 mol L −1 ) and a low detection limit (1 10 −9 mol L −1 ), which is attributing to its large special surface area and good conductivity. Moreover, the modified electrodes are convenient to fabricate, which can be used to detect 10-HCPT in urine samples successfully.
研究领域:
材料科学
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分析化学
·
生物医学
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Polymers
·
2022
·Vol. 14
·期 12
·2512
·
IF 4.967
Fanghua Luo,Chen Ma,Yuhui Tang,Lintao Zhou,Youpeng Ding,Guohua Chen
High thermal conductivity polymer matrix composites have become an urgent need for the thermal management of modern electronic devices. However, increasing the thermal conductivity of polymer-based composites typically results in loss of lightweight, flexibility and electrical insulation. Herein, the polyvinyl alcohol (PVA)/PVA-chitosan-adsorbed multi-walled carbon nanotubes/PVA (PVA/CS@MWCNTs) composite films with a sandwich structure were designed and fabricated by a self-construction strategy inspired by the surface film formation of milk. The obtained film simultaneously possesses high thermal conductivity, electrical insulation, and excellent flexibility. In this particular structure, the uniform intermediate layer of PVA-CS@MWCNTs contributed to improving the thermal conductivity of composite films, and the PVA distributed on both sides of the sandwich structure maintains the electrical insulation of the films (superior electrical resistivity above 1012Ω·cm). It has been demonstrated that the fillers could be arranged in a horizontal direction during the scraping process. Thus, the obtained composite film exhibited high in-plane thermal conductivity of 5.312 W·m−1·K−1at fairly low MWCNTs loading of 5 wt%, which increased by about 1190% compared with pure PVA (0.412 W·m−1·K−1). This work effectively realizes the combination of high thermal conductivity and excellent electrical insulation, which could greatly expand the application of polymer-based composite films in the area of thermal management.
研究领域:
材料科学
·
热管理技术
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