BIOSENSORS & BIOELECTRONICS
·
2014
·
IF 6.451
Yanan Xu,Hui Wu,Chusen Huang,Caiqin Hao,Beina Wu,Chongchong Miao,Shen Chen,Nengqin Jia
Vicinal-dithiol-containing Proteins (VDPs) are overexpressed in cancer cells and become a potential biomarker for aggressive tumors, the synthesized 2-p-aminophenyl-1, 3, 2-dithiarsenolane (VTA2) is proved to be a highly selective ligand for vicinal dithiols of VDPs in cells. In this report, we developed a new cytosensor based on three-dimensional (3D)-like VTA2-conjugated multiwalled carbon nanotubes (VTA2@MWCNTs) array modified indium tin oxide (ITO) electrode for sensitive and selective detection of VDPs-overexpression tumor cells. The layer-by-layer assembling and cellular detection performances of the 3 D -VTA2@MWCNTs-based cytosensor were investigated by atomic force microscopy (AFM) and electrochemical methods including cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV). Attributed to signal amplification and targeting recognition of the 3 D -structured MWCNTs@VTA2, the fabricated cytosensor showed high specificity and sensitivity to the detection of VDPs-overexpression HL-60 cells ranging from 2.7×10 2 to 2.7×10 7 cells mL −1 with a low detection limit of ca. 90 cells mL −1 . Furthermore, the captured cancer cells on the cytosensor also could be directly visualized by optical microscopy technology. This proposed 3 D -MWCNTs array-based cytosensing strategy provides a simple, sensitive approach for non-invasive cell detection, presenting potential applications in cancer diagnosis.
研究领域:
生物传感器技术
·
癌症诊断
·
纳米材料应用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2024
·Vol. 16
·期 38
·6529-6537
·
IF 2.7
Na Li,Baokun Tang,Tao Zhu
Carbendazim (CBZ) is widely used for crop protection and its residues threaten human health and the environment. Therefore, developing an effective electrocatalyst is important for the extremely sensitive detection of CBZ. Lattice-strain engineering is an effective strategy to change its electronic structure and ultimately optimize the catalytic performance of materials, which can be used as a modification method to improve the detection performance of electrochemical sensors. Herein, a NiFeLDH@HsGY-NH2/MWCNTs heterojunction with strain effect is prepared by the electrostatic self-assembly method. The structure, morphology, composition, crystallinity and electrochemical performance of NiFeLDH@HsGY-NH2/MWCNTs are analyzed using various instrumental techniques, in which geometric phase analysis (GPA) and X-ray diffraction (XRD) images confirm the lattice-strain generated in NiFeLDH@HsGY-NH2/MWCNTs. The results indicate that the prepared electrochemical sensor exhibited an excellent response for carbendazim (CBZ) in the linear range of 0.05–50.00 μM with a detection limit of 10.00 nM (S/N = 3) under the optimal detection conditions. By analyzing the reasons for the improvement of the catalytic performance of the composite material, it is found that the composite of MWCNTs not only improves the conductivity of NiFeLDH but also regulates the electronic structure of metal atoms through double effects. This study provides new insights into the design of efficient and low-cost catalysts to facilitate electrochemical sensor applications.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Iranian Chemical Society
·
2024
·Vol. 21
·期 3
·877-885
·
IF 2.2
Liu Gang,Liu Lihui,Zhou Yuyi,Wang Ya,Sui Guoqi,Zhang Peng
In this study, Bi 2 O 3 nanoparticles are prepared via an impregnation method and modified using multi-walled carbon nanotubes (MWCNTs) and PW 12 . XRD reveals that the prepared Bi 2 O 3 corresponded to the monoclinic α -phase. SEM results reveal that the composite consists of a series of nanosheets with flower-like structures. In this study, malachite green (MG) is used as a simulated contaminant to test the degradation capability of the compound under sunlight, and the effect of PW 12 doping on the photocatalytic properties of the sample is investigated. The results show that the degradation kinetic constant of 0.3 PW 12 /MWCNTs/Bi 2 O 3 (0.8125 h −1 ) is about 3 times that of Bi 2 O 3 (0.2767 h −1 ). The ternary complex containing 30% PW 12 has a degradation rate of 95% in 2.5 h. h + and \(^\cdot {\text{O}}_2^-\) were the major active species in the photocatalytic degradation of MG.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 29
·期 10
·1-11
·
IF 3.061
Xie Zhiyuan,Wang Dong,Yu Zhanyu,Zheng Wen,Liu Bo,Zhang Aibo
Poly(styrene-sodium p-styrene sulfonate) microspheres with porous morphology were prepared by dispersion polymerization and seed swelling selecting two monomers of sodium p-styrene sulfonate and styrene, which are denoted as P(St-NaSS). The method is simple and easy to effectively control the pore structure microspheres. The SEM results showed that the surface morphology of P(St-NaSS) microspheres is in porous, and the diameter of pores is about 0.5 μm. In this paper, the influence of swelling time on the pore size was investigated. The SEM results indicated that the longer the swelling time, the larger the pore size of microspheres. The absorbing hybrids of swelled multi-porous P(St-NaSS) @MWCNTs and non-swelled P(St-NaSS)@MWCNTs with three-dimensional conductive network were assembled by π bond stacking effect, and study the strength of its absorption of electromagnetic waves. Compared with P(St-NaSS)@MWCNTs hybrids, the multi-porous P(St-NaSS) hybrids exhibited better absorbing performance, the reflection loss is -35.24 dB at 7.15 GHz at 2 mm thick, while the reflection loss of P(St-NaSS)@MWCNTs is -24.63 dB. The experimental results show that the existence of porous in wave-transparent microspheres played an important role in improving the impedance matching, increasing the path of multiple reflection scattering, which is beneficial to improve the absorption of MWCNTs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Peng Wang,Shiqi Zhong,Mei Lin,Cong Lin,Tengfei Lin,Min Gao,Chunlin Zhao,Xiangqi Li,Xiao Wu
Recently, the lead-free piezoelectric material Bi 0.5 Na 0.5 TiO 3 (BNT) has been adopted for piezo-catalysis and synergistic catalysis, such as piezo-photocatalysis. Nonetheless, the catalytic effect of single BNT is too weak to degrade multifarious contaminants. Here, BNT and multi-walled carbon nanotubes (MWCNTs) composite were prepared and the catalytic performance of BNT was prominently boosted by introducing MWCNTs as the electron capturer. Particularly, the degradation rate of Rhodamine B (RhB, a typical contaminant) could reach 90% within 30 min, with a high rate constant of 0.0805 min −1 . The specific degradation pathway of RhB was analyzed. The formation of oxygen vacancies was confirmed by XPS analysis, and the vital role of oxygen vacancies in the separation of photo-generated carriers was elucidated. Meanwhile, the BNT/MWCNTs composites manifested stronger transient current response compared to single BNT under the action of light irradiation and ultrasonic vibration, respectively. According to impedance analysis, the composites exhibited lower carrier transport resistance. Eventually, the mechanism of enhanced piezo-photocatalysis was explained in detail. This study provides an effective route to break the shackle of carrier recombination and speed up the carrier transport in piezo-photocatalytic materials.
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
Russian Journal of Physical Chemistry A
·
2022
·Vol. 95
·期 2
·S352
·
IF 0.791
Meng Ying,Lu Shibin,Wu Yaodong,Sun Miao,Lu Haisheng,Zi Zhenfa,Sun Shengjie,Tang Hao
Abstract The porous CoO/MWCNTs and Zn/MWCNTs composites have been fabricated with the wet chemical method and pyrolysis process. For the reason of good impedance matching characteristics, CoO/MWCNTs composites with highly porous structure and dielectric loss properties present exceedingly powerful absorption ability of EM waves, which has a –44.67 dB maximum reflection loss (RL) value at 17.76 GHz at 1.5 mm sample thickness, and the absorption bandwidth below –10 dB is 14.0 GHz (4.0–18 GHz). Moreover, the filling content of the composites into paraffin matrix is merely 10 wt %, which is lower than that of most wave absorbers reported in the past. Consequently, CoO/MWCNTs composites can be used as a potentially lightweight EM wave absorbing material.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Haotian Wu,Gang Zhang,Xiaozhan Yang
An electrochemical biosensor based on iron tetroxide (Fe 3 O 4 )/carboxylated carbon nanotubes (MWCNTs-COOH)/gold nanoparticles (AuNPs) was designed for the detection of alpha-fetoprotein (AFP), which is often used as an important indicator for the early clinical diagnosis of liver cancer markers. The Fe 3 O 4 /MWCNTs-COOH nanocomposite was synthesized by a solvothermal method and it combined with gold nanoparticles (AuNPs) deposited at the constant potential on a glassy carbon electrode to form Fe 3 O 4 /MWCNTs-COOH/AuNPs, which intensifies the electrical signal while the large active sites enable more stable immobilization of the AFP monoclonal antibodies on the electrode. The electrochemical performance of Fe 3 O 4 /MWCNTs-COOH/AuNPs was investigated in detail and the electrochemical response signal after the immune reaction with the AFP antigen-antibody was recorded. The peak current Ip of the response signal is linearly proportional to the lg c AFP in the range of 1 pg mL −1 –10 μg mL −1 , with a detection limit of 1.09034 pg mL −1 and good performance in clinical sample testing. The proposed sensor has shown great application and development potential in clinical medicine field.
研究领域:
生物化学
·
纳米技术
·
生物医学工程
·
临床医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 5
·1-10
·
IF 5.3
Wu Qian,Tian Li,Shan Xiangyu,Li Huiling,Yang Shuning,Li Chao,Song Yujia,Li Ruidan,Guo Yanjia,Lu Juan
A molecularly-imprinted electrochemiluminescence sensor was constructed for the determination of fenpropathrin (FPT) by molecular imprinting technology. In this sensing platform, the introduction of CdS@MWCNTs significantly enhanced the initial ECL signal of the luminol-O 2 system. Specifically, MWCNTs was used as a carrier to adsorb more CdS, in which CdS acted as a co-reaction promoter for luminescence. Molecularly imprinted polymer (MIP) containing specific recognition sites of FPT was used as the material for selective recognition. With increasing amount of FPT the ECL signal decreased. Under the optimum conditions, the ECL response was linearly related to the logarithm of FPT concentration. The developed ECL sensor allowed for sensitive determination of FPT and exhibited a wide linear range from 1.0 × 10 − 10 mol L − 1 to 1.0 × 10 − 6 mol L − 1 . The limit of detection was 3.3 × 10 − 11 mol L − 1 (S/ N = 3). It can be used for the detection of FPT in vegetable samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhen Xiang,Baiwen Deng,Chuang Huang,Zhicheng Liu,Yiming Song,Wei Lu
High-performance electromagnetic wave (EMW) absorbing materials have been widely used in the wireless communication and electronic devices due to their important potentials in electromagnetic attenuation. However, it is difficult to develop carbon-based absorbers with thin thickness, lightweight, and low filler loading. In this work, rationally designed hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites were successfully realized for ultrathin, lightweight, and high-efficiency EMW absorbers. It showed that the composition, microstructure, and morphology of composites were tailored, which gave rise to the tunable magnetic behavior, porosity, and electromagnetic parameters. The rational design of composition and novel structure contributed to the optimization of the impedance match. The EMW attenuation was enhanced by the synergistic effects of the dielectric loss originated from the interfacial and dipole polarization, conductive loss stemmed from the 3D conductive network, and the magnetic loss derived from the eddy-current loss and ferromagnetic resonance. Accordingly, the hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites with a low filling ratio of 20 wt% achieved an ultrathin matching thickness of 1.4 mm and a strong reflection loss of −63.6 dB. The substantially enhanced EMW absorbing performances were owing to the optimized impedance matching and enhanced attenuation capability. Therefore, this work can provide a paradigm for the design and synthesis of hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites with an enhanced EMW absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Chenying An,Caihui Li,Haoqing Tang,Tao Liu,Zhiyuan Tang
High performance flexible electrodes with ultrathin and ultralight characteristics are great potential as power supply for foldable and wearable electronic devices. One major problem is how to combine active material with conductive substrate firmly in the absence of polymeric binder. Here, sandwich structure of flexible electrode is successfully prepared which Li 2 ZnTi 3 O 8 @multi-walled carbon nanotubes (MWCNTs) composite as intermediate anode active ingredient and three-dimensional network MWCNTs as top and bottom conductive layers. The MWCNTs in active material and conductive layers cross-link each other to form a firm and stable three-dimensional network, which provides stereoscopic electron and ion transmission channels without metal copper substrate. This particular structure of electrode is effectively reduce the total weight and improve flexibility. Typically, the flexible Li 2 ZnTi 3 O 8 @MWCNTs electrode shows good cycling stability and achieved a high reversible capacity of 95.2 mAh g −1 after 1000 cycles at current density of 7000 mA g −1 with 89.0% capacity retention and 99% Coulombic efficiency. This study offers a new strategy for the development of high conductivity flexible electrode for wearable devices and deformable electronic devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Xinzhu Wen
It is crucial for the storage and conversion of hydrogen energy to substitute the low theoretical potential of urea oxidation reaction (UOR) for the high theoretical potential of anodic water electrolysis (oxygen evolution reaction (OER)). In this paper, it puts forward a brief and scalable strategy, so as to synthesize a novel bifunctional nickel-iron layered double hydroxide and multi-walled carbon nanotube composites supported on Ni foam, represented as NiFe-LDH/MWCNTs/NF. Electrochemical measurements demonstrate that NiFe-LDH/MWCNTs/NF is able to realize an efficient electrocatalysis for UOR. During this process, merely a potential of 1.335 V is needed at 10 mA cm −2 , which can be taken to replace OER, thus reducing overpotential in H 2 -production as well as power consumption . In addition, NiFe-LDH/MWCNTs/NF also exhibits electro-defense electrocatalytic efficiency to achieve the reaction of hydrogen evolving process, which provides a low overpotential of 98 mV at 10 mA cm −2 . To further prove it, all-water-urea electrolysis measurement is carried out in 1 M KOH and 0.5 M Urea with NiFe-LDH/MWCNTs/NF as cathode and anode respectively. NiFe-LDH/MWCNTs/NF||NiFe-LDH/MWCNTs/NF electrode manages to provide 10 mA cm −2 at a voltage of merely 1.507 V, 156 mV lower than that of water splitting, which proves its commercial viability in energy-saving hydrogen production .
研究领域:
能源材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Nana Tang,Shuting Shi,Chuanqin Zhou,Jianhua Ding,Aiting Chen,Quanguo He,Wu Wang
The misuse of the antibiotic ampicillin (AMP) has led to the presence of antibiotic residues in related products, which enter the human body through the ecological or food chain to produce a variety of toxic side effects. There is an urgent need to develop enzyme-based assays with higher specificity to determine antibiotic residues in food. Hereby, bismuth tungstate (Bi 2 WO 6 ) was synthesized using a simple hydrothermal and calcination process. Carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) were mixed with Bi 2 WO 6 by ultrasonication to form composite as modifier on glassy carbon electrode (GCE) surface. Meanwhile, metal β-lactamases (MBLs) were mixed with chitosan to be immobilized on it to obtain the MBLs/CS/Bi 2 WO 6 /MWCNTs-COOH/GCE. Under the optimal conditions, differential pulse voltammetry (DPV) was used for the quantitative detection of AMP. The experimental results showed that the peak currents were linearly correlated with the concentrations of AMP (0.0007–0.05 μM) and (0.1–10 µM) (R 2 = 0.9965 and 0.9956), and the detection limit was 0.17 nM (S/N = 3). The method has good repeatability, reproducibility, stability and immunity to interference, and can be applied to the highly sensitive detection of AMP in real samples with recoveries of 92.4–96.8 % and 94.3–103.0 %.
研究领域:
生物传感
·
电化学分析
·
食品检测
✓ 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）