INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 6
·8313-8327
·
IF 4.672
Nianben Zheng,Fang Yan,Long Wang,Zhiqiang Sun
Summary Solar energy is being widely investigated due to its abundant, renewable, and clean features. Photo-thermal conversion in solar collectors is a direct approach for harvesting solar energy. Compared to the commonly used surface-based solar collectors (SSCs), nanofluid-based direct absorption solar collectors (DASCs) are more efficient. In this work, water-based mono MWCNT and hybrid MWCNT-TiN nanofluids were prepared through a two-step method, aiming at light absorption enhancement of nanofluids for applications in DASCs. The optical and photo-thermal conversion performance of the MWCNT nanofluids was firstly evaluated. The results showed that the MWCNT nanofluids presented high solar absorption capability, and the highest photo-thermal conversion efficiency was obtained at 10 ppm. The TiN nanoparticles were subsequently incorporated to form the hybrid MWCNT-TiN nanofluids. The absorption performance of the hybrid nanofluids was further enhanced. The highest efficiency of the hybrid MWCNT-TiN nanofluids was achieved at the TiN mass fraction of 10 ppm, which was about 6.9%, 6.0%, and 3.8% higher than that of the MWCNT nanofluid at 2000, 4000, and 6000 seconds due to the localized surface plasmon resonance (LSPR) effect of TiN nanoparticles. It was also found that the collector efficiency dropped rapidly with the prolonged irradiation time owing to the convection and radiation heat loss at the elevated temperature. Therefore, effective measures should also be taken to reduce heat loss to maintain high photo-thermal conversion efficiency.
研究领域:
太阳能
·
纳米技术
·
材料科学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 41
·4967-4976
·
IF 2.596
Xin Yao,Jinhui Shen,Qingyan Liu,Huanbao Fa,Mei Yang,Changjun Hou
In this work, we designed and synthesized a nanocomposite comprising an amine-functionalized metal organic framework (UiO-66-NH2), a multiwalled carbon nanotube@reduced graphene oxide nanoribbon (MWCNT@rGONR) and a covalent organic framework (COF) synthesized using melamine and cyanuric acidmonomers via polycondensation (represented by MCA). The UiO-66-NH2/MCA/MWCNT@rGONR nanocomposite was used as a sensitive platform for an electrochemical aptasensor to detect kanamycin (kana). Owing to the rich chemical functionality, amino-rich structure and excellent electrochemical activity, the cDNA strands with terminal amino groups can not only anchor over the UiO-66-NH2/MCA/MWCNT@rGONR surface but also penetrate into the interior of porous UiO-66-NH2/MCA/MWCNT@rGONR networks. The characterization of the UiO-66-NH2/MCA/MWCNT@rGONR nanocomposite was performed by scanning electronic microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR) spectroscopy and X-ray diffraction (XRD). Furthermore, cyclic voltammetry (CV) and square wave voltammetry (SWV) were employed for the electrochemical performance study of this biosensor. The results indicated that the UiO-66-NH2/MCA/MWCNT@rGONR nanocomposite exhibited high bioaffinity toward the aptamer and the lowest limit of detection at 13 nM (S/N = 3) within a linearity of the kana concentration of 25–900 nM. In addition, it possessed great repeatability, stability and selectivity and obtained satisfactory recovery results in the real analysis of fish meat and milk, indicating the great potential for analytical measurements in food safety.
研究领域:
分析化学
·
食品科学
·
生物传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Microsystems & Nanoengineering
·
2023
·Vol. 9
·期 1
·1-13
·
IF 7.9
Luo Yunyun,Zhao Libo,Luo Guoxi,Dong Linxi,Xia Yong,Li Min,Li Ziping,Wang Kaifei,Maeda Ryutaro,Jiang Zhuangde
Flexible electronics have demonstrated various strategies to enhance the sensory ability for tactile perception and wearable physiological monitoring. Fibrous microstructures have attracted much interest because of their excellent mechanical properties and fabricability. Herein, a structurally robust fibrous mat was first fabricated by electrospinning, followed by a sequential process of functionalization utilizing ultrasonication treatment and in situ polymerization growth. Electrospun polyurethane (PU) microfibers were anchored with multi-walled carbon nanotubes (MWCNTs) to form conductive paths along each fiber by a scalable ultrasonic cavitation treatment in an MWCNT suspension. After, a layer of poly(3,4-ethylene dioxythiophene) (PEDOT) was grown on the surface of PU fibers decorated with MWCNTs to enhance the conductive conjunctions of MWCNTs. Due to the superior electromechanical behaviors and mechanical reinforcement of PEDOT, the PEDOT/MWCNT@PU mat-based device exhibits a wide working range (0–70 kPa), high sensitivity (1.6 kPa −1 ), and good mechanical robustness (over 18,000 cycles). The PEDOT/MWCNT@PU mat-based sensor also demonstrates a good linear response to different temperature variations because of the thermoelectricity of the PEDOT/MWCNT composite. This novel strategy for the fabrication of multifunctional fibrous mats provides a promising opportunity for future applications for high-performance wearable devices.
研究领域:
材料科学
·
柔性电子
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water
·
2024
·Vol. 16
·期 14
·2026
·
IF 3
Yang Gu,Chengjun Qiu,Wei Qu,Wei Tao,Zizi Zhao,Huili Hao
Cadmium (Cd) and zinc (Zn) in seawater enter the human body through the food chain. Combined toxicity tests indicated that high concentrations of Cd(II) and low concentrations of Zn(II) had a synergistic effect on humans. Thus, there is an urgent need to prepare a sensor for rapid and simultaneous detection of Cd(II) and Zn(II) in seawater. Herein, a reduced graphene oxide/carboxylated multi-walled carbon nanotube (rGO/MWCNT-COOH)-modified glassy carbon electrode was prepared in the experiments using the dropping method. The synthesis of various materials achieved the purpose of expanding the surface area, and scanning electron microscopy was used to observe the structure of the composite membrane. Moreover, the large number of functional groups on the surface of the composite membrane can also increase the adsorption of ions. For the determination of trace cadmium (II) and zinc (II) in seawater, the method used was differential pulse voltammetry (DPV). The results show that the peak current, which was obtained in the range of 5–400 μg/L for Cd(II) and Zn(II), has a linear relationship with concentration, corresponding to the detection limits of 0.8 μg/L for Cd(II) and 0.98 μg/L for Zn(II). The modified electrode was used to determine the Cd(II) and Zn(II) content in the coastal seawater of the Maowei Sea, and the recovery rate was between 95.8 and 98.2% for Cd(II) and 96.7~99.4% for Zn(II), which provided a novel approach of detection to define trace Cd(II) and Zn(II) in seawater.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2018
·Vol. 24
·期 12
·4055-4061
·
IF 2.347
Wu Kezhong,Zhao Jiajing,Xiong Yuanyuan,Ruan Bei,Wu Mingxing
Pt-free composite counter electrode (CE) composed of La 2 O 3 was successfully synthesized by a simple pyrolysis of Lanthanum acetate hydrate (La(CH 3 COO) 3 ·xH 2 O) in a high-temperature solid phase. Furthermore, three proportion composite catalysts of La 2 O 3 @MWCNTs based on La 2 O 3 and multiwall carbon nanotubes (MWCNTs) were prepared and characterized as Pt-free catalysts for CE in dye-sensitized solar cells (DSSCs). The morphology and structure of La 2 O 3 @MWCNT composites were determined by scanning electron microscopy and X-ray diffraction. The electrochemical performance of La 2 O 3 @MWCNT composite catalysts for CEs was determined by photocurrent-voltage measurements, cyclic voltammetry, electrochemical impedance spectroscopy, and Tafel polarization. The experimental results showed that the power conversion efficiencies of 5.20, 5.12, and 4.70% were obtained for La 2 O 3 : MWCNTs with mass ratios of 5:1, 3:1, and 1:1 as counter electrode towards the reduction of I 3 − /I − ions respectively in the encapsulation of DSSC batteries, which were higher than that of MWCNTs (3.94%) and La 2 O 3 (0.77%) electrode under the similar conditions. The enhanced electrode performance was attributed to relatively larger surface area and higher conductivity of La 2 O 3 @MWCNT composite catalysts.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Qunna Xu,Xiaoyu Xu,Jianzhong Ma,Yan Zong,Kai Yan,Pengni Li
Flexible hydrogels have emerged as highly-desirable materials for wearable strain sensors. However, pristine biomass hydrogel systems are limited by their lack of stretchability, self-adhesion, and sensitivity. Here, a novel CA/MWCNT/PAAm double-network conductive hydrogel was developed through integrating casein (CA) micelles and multi-walled carbon nanotubes (MWCNT) into the polyacrylamide (PAAm) network. The resulting hydrogel displayed desired properties such as adhesiveness, toughness, self-healing, and near-infrared photothermal response. In this hybrid system, MWCNT were uniformly dispersed in the presence of casein micelles through hydrogen bonding and electrostatic interactions, favoring its role of nano reinforcement. Moreover, based on the “casein micelle-nanoparticle double cross-linking" mechanism and its double network structure, the prepared hydrogel showed high extensibility (2288 % ± 63 %), fast responsiveness (273 ± 5.13 ms), high sensitivity (GF = 12.46 ± 0.35), and a wide strain range (1–1000 %). Through consistent and repeated electrical inputs, this hydrogel was able to detect including large and small human movements, such as hand, leg, and swallowing motions. The results from this study provide a new way to fabricate bio-based hydrogel sensors with excellent mechanical and electrical properties.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Lili Sun,Yun Guo,Yanchao Liu,Ronghua Ni,Gang Chen,Xiaoshun Wei,Zebin An,Zheng Jiao
Modification of traditional metal oxides to prepare gas sensors with excellent response and high selectivity for monitoring air pollution, is a pivotal indicator for the development of gas sensing technologies. In this research, the core-shell Tourmaline@ZnO/MWCNT micro-nanostructured composite was successfully constructed and prepared by the uniform co-precipitation and hydrothermal methods , which effectively achieved the high sensitivity to n-butanol. The structure, morphology and surface electron valence state were characterized by employing important analytical techniques. With tourmaline as the inner-core and MWCNT-interspersed ZnO nanosheets as the outer-shell, the uniquely hierarchical micro-nanostructure covered a larger specific surface area, which provided more active sites during the reaction. Meanwhile, the performance assessments demonstrated that the proposed micro-nano structure exhibited exceptional gas-sensing properties, while Tourmaline@ZnO/ 0.9%MWCNT sensor reaching the highest response value to 185.8–100 ppm n-butanol far exceeding other detected gases, additionally with a faster response-recovery time. The presence of tourmaline and the interspersion of MWCNT played a synergistic effect on the enhancement of the properties for ZnO-based gas sensors, which brought about a beneficial impact on the carrier transport. This technical strategy should be of certain significance in the intelligent preparation and extensive application of high-performance sensing devices in the future.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
DOI
高影响因子
Crystals
·
2025
·Vol. 15
·期 6
·505
·
IF 2.4
Xinyuan Zhang,Meng Sun,Haibo Guo,Ming Su
Pursuing cost-effective non-precious metal electrocatalysts is a key challenge in the field of sustainable energy conversion. Transition metal dichalcogenides, known for their unique electronic structure, demonstrate superior electrocatalytic capabilities for the hydrogen evolution reaction (HER), yet their effectiveness is still lacking. In the present study, a CuS/Co3S4@MWCNT composite was fabricated via single-step hydrothermal synthesis for HER applications. This catalyst exploited the synergistic effects between CuS and Co3S4to increase edge site functionalities and metallic conductivity, thereby resulting in high catalytical activity within the material. Furthermore, the incorporation of multi-walled carbon nanotubes (MWCNTs) into the composite effectively enhanced electron transfer kinetics throughout the HER process. Notably, thiourea serves a dual function in this synthesis, acting both as a reducing agent and as a sulfur source for the formation of metal sulfides. When evaluated in a 1 M KOH alkaline electrolyte, the synthesized nanocomposite exhibited a minimal overpotential of 300 mV to reach a current density of 10 mA/cm2, and a Tafel slope of merely 76.2 mV/dec, indicative of its good HER catalytic activity. These findings underscore the composite’s potential for application in hydrogen production technologies.
研究领域:
材料科学
·
电化学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Suqi Liu,Xiaowei Wu,Shihao Chen,Cong Liu,Wanqi Zhang,Mingyi Yang,Jiyu Cheng,Guoquan Lu,Zhenhe Wang,Wei Chen,Yuge Guan,Linjiang Pang,Xinghua Lu
Linalool, a terpenoid alcohol with bacteriostatic properties, was detected in sweetpotato suffering from black spot disease. In this research, a composite material based on HKUST-1/MWCNT-gel@MIP was employed to detect the linalool content in these infected sweetpotatoes. The micro-morphology and crystal structure of the composite were characterized using scanning electron microscopy (SEM), fourier transform infrared (FTIR), and x-ray diffraction (XRD). Experimental results demonstrated that the quartz crystal microbalance (QCM) gas sensor of HKUST-1/MWCNT-gel@MIP composite exhibited high sensitivity (0.873 Hz/ppm), a low detection limit (0.237 ppm), a small standard deviation (0.83 %), good reproducibility, and outstanding selectivity. The QCM gas sensor data from actual samples showed a strong correlation with gas chromatography-mass spectrometry (GC–MS) results (r = −0.976, p < 0.01), demonstrating its exceptional ability to identify linalool. Thus, it can be used for early detection of sweetpotato black spot disease.
研究领域:
植物病理学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2024
·Vol. 16
·期 24
·3867-3877
·
IF 2.7
Xin Yao,Liyu Yang,Siyi Yang,Jinhui Shen,Danqun Huo,Huanbao Fa,Changjun Hou,Mei Yang
A Ti3C2Tx/MoS2/MWCNT@rGONR nanocomposite was prepared for the first time for building a sensitive electrochemical aptasening platform to simultaneously detect kanamycin (Kana) and chloramphenicol (Cap). Owing to their accordion-like structure, rich surface groups, and high charge mobility, Ti3C2Tx/MoS2/MWCNT@rGONR composites provided a spacious covalent immobilization surface and a better electrochemical aptasensing platform. The aptamers of Kana and Cap used in sensors enhance the selectivity. Furthermore, TiP, an ion exchanger, was used for loading more different metal ions functioning as labels to form a sandwich-type sensor together with Ti3C2Tx/MoS2/MWCNT@rGONR, improving the electrochemical sensitivity and obtaining a highly distinguishable signal readout. Under the optimized conditions, the sensor has good detection limits of 0.135 nmol L−1 and 0.173 nmol L−1 for Kana and Cap, respectively, at the same linearity concentration of 0.5–2500 nmol L−1. Finally, it was successfully applied for detection in milk and fish meat, and the results were compared with the standard method HPLC, indicating its great potential for food safety monitoring.
研究领域:
分析化学
·
食品安全
·
生物传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 7
·4268-4277
·
IF 2.779
You Yan-bin,Wang Hai-yan,Li Lan,Bai Lin-rui,Dang Zhi-Min
In order to improve the dielectric properties and the thermal conductivity of the PVDF-based composites, the BaTiO 3 @super-short MWCNT (BT@SSCNT) particles were modulated by a SSCNT shell fabricated by MWCNT with the different types (S-MWCNT-1020, S-MWCNT-2040). The average size of these particles is about 300 nm. With the increase in the external diameter of MWCNT, the SSCNT content of the BT@SSCNT particles decreases. However, the sum proportions of which the diameter of the particles is not less than 295 nm have a distinct growth leading to that the distance between the neighboring particles shortens. The dielectric constants of the composites are more than 355 and 1500 (10 3 Hz) at 10 wt% and 60 wt% filler loading, respectively. Compared with the BT@SSCNT/PVDF-1020 composites, the dielectric constants of the BT@SSCNT/PVDF-2040 composites have a more stable frequency dependency in the range of 10 2 to 10 6 Hz. The value of the composite with 10 wt% BT@SSCNT loading maintains more than 250 at 10 6 Hz. The introduction of the shell of SSCNT with larger external diameter can offer the composites a more desirable combined action of dielectric mechanisms, including interfacial polarization and micro-capacitor effect. In addition, the varying SSCNT shells also have evident influence on dielectric loss, breakdown strength, and thermal conductivity. It is worth mentioning that the values of the BT@SSCNT/PVDF-2040 composites are 334 and 0.16 (10 4 Hz), 229 kV mm −1 , and 1.13 W (m K) −1 at 10 wt% filler loading, respectively. This work could extend the strategies for building the core–shell particles to develop dielectric nanocomposites.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 17
·3041
·
IF 3.06
Yanqing Liu,Gengxin Hu,Hongwu Wang,Su Yao,Yinjian Ye
A hybrid nanocomposite consisting of hydroxylated multi-walled carbon nanotubes (MWCNTs−OH) and cube mesoporous carbon (CMK−8) was applied in this study to construct an MWCNT−OH/CMK−8/gold electrode (GE) electrochemical sensor and simultaneously perform the electro-reduction of olaquindox (OLA) and carbadox (CBX). The respective peak currents of CBX and OLA on the modified electrode increased by 720- and 595-fold relative to the peak current of GE. The performances of the modified electrode were investigated with electrochemical impedance spectroscopy, cyclic voltammetry, and differential pulse voltammetry. Then, the modified electrodes were used for the individual and simultaneous determination of OLA and CBX. The fabricated sensor demonstrated a linear response at 0.2–500 nmol/L in optimum experimental conditions, and the detection limits were 104.1 and 62.9 pmol/L for the simultaneous determination of OLA and CBX, respectively. As for individual determination, wide linear relationships were obtained for the detected OLA with levels of 0.05–500 nmol/L with LOD of 20.7 pmol/L and the detected CBX with levels of 0.10–500 nmol/L with LOD of 50.2 pmol/L. The fabricated sensor was successfully used in the independent and simultaneous determination of OLA and CBX in spiked pork samples.Keywords:CMK−8;MWCNTs−OH;electrochemical sensor;differential pulse voltammetry;simultaneous determination;carbadox;olaquindox
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
危险品化学品经营许可证（带存储）