JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
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IF 6.1
Renjie Xie,Jianbin Lu,Jian Wang
The detection of dissolved gases in the oil of oil-immersed transformers is essential to evaluate the operating status of oil-immersed transformers. In this study, a CuO/TiO 2 /N-MWCNTs composites-based sensor was fabricated by hydrothermal method for the detection of dissolved CO gas in oil. The introduction of N-MWCNTs with high specific surface area, high electrical conductivity and multiple adsorption sites effectively improved the response value and response/recovery performance for CO. The response can reach 4.33 at a CO concentration of 50 ppm, which is 1.74 times higher than that of the CuO/TiO 2 sensor. In addition, the prepared sensor presents a fast response/recovery time (230 s/60 s) to CO, and has excellent selectivity and long-term stability. Finally, a multi-concentration CO alarm system was constructed through a reasonable circuit design. It is shown that the CuO/TiO 2 /N-MWCNTs-based sensor can achieve high-precision CO detection, which can provide a new idea for the detection of dissolved CO gas in the oil of oil-immersed transformers.
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ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Qinan Zhou,Luyi Zhu,Chengyu Zheng,Jun Wang
We have developed a tungsten disulfide (WS2)/multiwall carbon nanotubes (MWCNTs) nanocomposite based QCM gas sensor for (trimethylamine) TMA gas sensing of low concentrations. WS2/MWCNTs nanocomposite was synthesized via the hydrothermal method and was characterized for surface morphology, nanostructure, thermal stability, and elementary composition. The TMA-sensing properties of WS2/MWCNTs nanocomposite based QCM sensor were investigated. The composite based QCM sensor showed faster response time, strong response amplitude, good gas capacity, and good selectivity and stability compared with as prepared WS2 and MWCNTs-1 based QCM sensor. The response time of WS2/MWCNTs based QCM sensor was 294.1 and 142.9 s shorter than WS2 and MWCNTs-1 for 500 ppb TMA gas. And the response of the WS2/MWCNTs based QCM sensor was almost stable over 40 days, and the limit of detection (LOD) was 76 ppb calculated by the ICH method. This was ascribed to the fact that MWCNTs provided a skeleton for the growth of WS2 nanosheets and avoided agglomeration. The special structure could not only improve the structure ability but also expose more active adsorption sites. In order to further investigate the adsorption mechanism of the TMA molecule on (pure/functionalized) WS2 materials, density functional theory (DFT) calculations based on first-principle were conducted in the Vienna Ab-initio Simulation Package under ideal conditions.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Meng Zhou,Wenjie Zhao,Qiming Yan,Heqing Fu
The design of multiple heterogeneous interfaces has been proven to be a successful strategy to boost microwave absorption performance. However, the synthesis of magnetic microwave absorber with wide absorption bandwidth is still a challenge. In this work, ZnO@MWCNTs@NiFe 2 O 4 nanocomposites are fabricated by introducing ZnO on the surface of MWCNTs and subsequent anchoring of NiFe 2 O 4 . The minimum reflection loss can reach − 45.5 dB at 12.4 GHz with a thickness of 2 mm, while the broadest efficient absorption bandwidth is above 6.4 GHz at only a 3 mm thickness. Furthermore, the microwave absorption performance of ternary nanocomposites can be optimized by tunable the content of ZnO and NiFe 2 O 4 , whose microwave absorption mechanism depends on the synergy of dielectric loss and magnetic loss. The formation of 3D conductive network and heterogeneous interfaces contributes to the enhancement of conductive loss and polarization, respectively. The experimental results demonstrated that the ZnO@MWCNTs@NiFe 2 O 4 nanocomposites can provide a guide for microwave absorbers with wide absorption bandwidth in the future.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 32
·期 1
·1061-1072
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IF 2.22
Wang Yan,Di Xiaochuang,Lu Zhao
Lightweight absorbers with strong broadband microwave absorption are highly desired in military and civil fields. In this work, a 3D interpenetrating network formed from a Co@C@ MWCNTs composite was synthesized via a combined wet chemical and pyrolysis route. Because of strengthening interfacial polarization, suitable impedance matching and synergistic effects, the Co@C@MWCNTs hierarchical composite exhibited outstanding microwave absorption properties. An optimal reflection loss reached − 55.7 dB at 8.7 GHz and its effective bandwidth ( R L < − 10 dB) achieved 4 GHz (7.4–11.4 GHz) at an absorber thickness of 3 mm with a low filler content of 10 wt%. Furthermore, an effective bandwidth of 12.4 GHz (4.5–16.9 GHz) was obtained by varying the thickness from 2 to 4.5 mm. The superior microwave absorption performance originated from the enhanced interfacial polarization, multiple reflections, conductive network, synergistic effects and an improved impedance matching between Co–C and MWCNTs. This work provides a strategy to rationally design novel lightweight absorbers with strong microwave absorption.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2020
·
IF 6.444
Lu Wu,Longwei Li,Mingshuai Fan,Ping Tang,Shuaitao Yang,Lujun Pan,Hai Wang,Yuezhen Bin
A super strong poly (vinyl alcohol)/poly (acrylic acid) (PVA/PAA) anti-freezing hydrogel fiber has been successfully constructed and studied. The introduction of PVA chains significantly improves tensile strength and toughness to 3.8 MPa and 13.7 MJ/m 3 , respectively. In addition, glycerol in the hydrogel fiber ensures its good flexibility even in −15 °C. We coat hydrogel fiber with multi-walled carbon nanotubes (MWCNTs) and study their strain sensing properties. The composite hydrogel fiber has a high gauge factor of 25 at the strain of 40%, which is superior to those common hydrogel-based strain sensors. Notably, the composite hydrogel fiber shows a high stability and repeatability of 5000 cycles, and a fast response time of 225 ms. Besides, the composite hydrogel fiber can detect the large and subtle body movements accurately and timely. Therefore, this composite hydrogel fiber may be a very hopeful candidate for wearable sensing devices.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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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 .
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Xiaojie Shi,Huimin Liu,Mei Zhang,Fengzhen Yang,Jiansen Li,Yemin Guo,Xia Sun
An ultrasensitive aptasensor based on luminol-hydrogen peroxide (H 2 O 2 ) electrochemiluminescence (ECL) system was proposed for determination of profenofos. AuNPs decorated with MWCNTs ( [email protected] ) were used to provide a favorable microenvironment for luminol loading and improve the ECL signal due to their good biological activity, excellent electrical conductivity and high specific surface area. Gold and silver core-shell nanoparticles ( [email protected] ) could act as effective catalyzer to accelerate H 2 O 2 decomposition to produce various intermediate reactive oxygen species for signal amplification and thus increased the ECL signal again. Under optimal conditions, the proposed ECL aptasensor obtained an extremely low detection limit of 5.32 fg/mL (S/N = 3) with a good detection range from 100 fg/mL to 1 μg/mL. Moreover, the proposed aptasensor had excellent specificity, outstanding repeatability and favorable stability. Finally, the proposed ECL aptasensor was used for the detection of profenofos in real samples and the recoveries ranged from 94% to 102%. This strategy could provide a good reference for developing effective aptasensors for detection of other small molecules and toxins.
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PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Yeming Xian,Zhixin Kang
The lack of thermal conductance (TC) remains to be a challenge for epoxy resin. Fortunately, the thermal conductance of epoxy resin can be effectively improved by filler incorporation. Recently, compositing epoxy resin with hybrid filler system has been the direction for the development of next-generation thermal conductive functional materials. In this paper, epoxy-based nanocomposites containing nanodiamonds (DNDs)/pristine multi-walled carbon nanotubes (p-MWCNTs) and DNDs/KH550 functionalized MWCNTs (MWCNTs-KH) as the hybrid filler system were prepared respectively, and the thermal conductance of the nanocomposites was compared. The addition of DNDs was found to play a dominating role in the MWCNTs-KH filler systems (0.2 g, from 0.30 W/mK to 0.34 W/mK), but hardly has any effect on the p-MWCNTs filler system (0.2 g, from 0.24 to 0.26 W/mK only). Furthermore, the TC of the DNDs/MWCNTs-KH (2 g) epoxy-based nanocomposite increased to 0.45 W/mK, displaying an enhancement of 114.2 %. A shift of 5 cm-1 recorded by FTIR and the shift of C O revealed by XPS for DNDs/MWCNTs-KH strongly confirmed the existence of hydrogen bonds. Associating with the characterization results of SEM, TEM and dispersion qualitative experiment, the significant improvement in the TC of DNDs/MWCNTs-KH (2 g) epoxy-based nanocomposite was attributed to the hydrogen bond attachment between DNDs and MWCNTs-KH. The mechanism is that the attachment improves the dispersion of the fillers in epoxy, leading to the formation of a more effective thermal conductive network, thus, the enhanced TC. This work may inspire future studies in hybrid filler recognition and self-assemble technology via hydrogen bonds.
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POLYMER TESTING
·
2019
·
IF 2.943
Nadia Taloub,Li Liu,Nahla Rahoui,Mohammad Hegazy,Yudong Huang
Surface modification of PIPD (Poly-pyridobisimidazole) fiber by grafting multi-walled carbon nanotubes (MWCNTs) to improve the fiber/epoxy interaction have significant influence on the overall performance of composite material. The functionalization of MWCNTs with polydopamine solution was initially occurred following by the grafted process in the tris-HCl solution (pH = 8.5). The coated MWCNTs has been successfully grafted to the PIPD samples as the scanning electron microscopy (SEM) showed. The Fourier-transform infrared spectroscopy (FTIR) and the X-ray photoelectron spectroscopy (XPS) supports the pervious analysis. A quite interesting improvement of the fiber/epoxy interaction was detected by 62% after the calculation of the interface shear strength (IFSS). Meanwhile, the bulk properties on the PIPD fiber which presented by the tensile strength (TS) was conserved, the degradation after the grafting was only by 5%. The surface energy of the fibers was also increased and that promotes the surface wettability of the grafted samples.
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Journal of Materials Chemistry C
·
2019
·Vol. 8
·期 2
·607-618
·
IF 6.641
Qiming Yan,Qi Fu,Jianfeng Hu,Heqing Fu
With the development of flexible electronic devices, strict requirements for sealing these electronics are put forward. Developing flexible sealants for next generation flexible electronic devices is essential for enabling a broad range of applications. Herein, we demonstrate a facile way to prepare a self-healing flexible urea-grafted multi-walled carbon nanotube/poly(urethane-sulfide) nanocomposite with robust mechanical strength, flexibility and high self-healing efficiency. On the one hand, urea-grafted multi-walled carbon nanotubes (urea-g-MWCNTs) are used as physical cross-linking agents, which will improve the mechanical strength and self-healing properties of the urea-g-MWCNTs/poly(urethane-sulfide) (U-MWC-PUS) nanocomposite. On the other hand, urea-g-MWCNTs act as a photothermal switch, which will absorb near-infrared (NIR) irradiation and convert it into thermal energy for local self-healing. Owing to the [2+1] radical-mediated disulfide exchange reaction and hydrogen bonding interactions in the U-MWC-PUS nanocomposite, covalent polymer networks can rearrange under thermal stimulation, which endows the U-MWC-PUS nanocomposite with self-healing properties. When the cracked U-MWC-PUS nanocomposite is kept at an appropriate temperature or treated with NIR irradiation, it can recover more than 90% of the original mechanical strength. At the same time, the self-healing mechanism of the flexible U-MWC-PUS nanocomposite was analyzed. Furthermore, the self-healing flexible U-MWC-PUS nanocomposite exhibits excellent adhesion and sealability in water. Our study may provide a facile way to fabricate self-healing flexible U-MWC-PUS nanocomposites for sealing electronic devices.
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SENSORS AND ACTUATORS B-CHEMICAL
·
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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BIOSENSORS & BIOELECTRONICS
·
2015
·
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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