ACS Sensors
·
2025
·
IF 9.1
Jingxin Qi,Runjia Xu,Yaru Liu,Kaifeng Xue,Lulu Du,Li Lv,Guangliang Cui,Pinhua Zhang
Developing miniaturized portable sensors for detecting NO2 at low temperatures in agricultural environments is crucial for enhancing nitrogen fertilizer utilization efficiency and preventing environmental pollution. This work successfully synthesized ZnO/MWCNT heterostructures using an in situ 2D electrodeposition method under direct current voltage, which demonstrated exceptional gas-sensing performance toward NO2 under both room and lower temperature conditions. The sensor demonstrates a 4-fold enhancement response to 10 ppm of NO2 compared to pristine ZnO sensors and exhibits a response of 98% to 1 ppm of NO2 at room temperature with a detection limit of 30 ppb. Even at −20 °C, it maintains a 5.1% response to 1 ppm of NO2. Notably, the unique nanosheet structure endows the heterostructure with reversible temperature sensing and high-temperature circuit-breaker characteristics, enabling the sensor to have the ability to alarm for temperatures above 50 °C. The incorporation of MWCNTs and the formation of the p–n heterojunction play a synergistic role in enhancing the gas-sensing performance. Moreover, we successfully detected NO2 emissions from nitrogen fertilizers using the ZnO/MWCNT heterostructure sensor, demonstrating its potential for integration with Internet of Things (IoT) technology to enable intelligent agricultural monitoring.
研究领域:
材料科学
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环境传感
·
农业技术
·
纳米技术
·
物联网（IoT）
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganics
·
2021
·Vol. 9
·期 12
·87
·
IF 0
He Zhu,Huilin Hu,Minheng Ye,Jinhua Ye,Defa Wang
The photoelectric performance of quantum dots (QDs)-based nanocomposites is closely related to the optical properties of QDs, which play a critical role in the optical absorption and separation/transfer of charge carriers. Herein, we report a nanocomposite composed of light absorber PbS1−xSexquantum dots (QDs), electron-conducting multiwalled carbon nanotubes (MWCNTs) and hole-conducting poly-3-hexylthiophene (P3HT) with tunable photoelectric conversion performance. In addition to using the quantization effect, we proposed solid-solution PbS1−xSexQDs (x = 0, 0.25, 0.5, 0.75, 1) for band gap engineering. In particular, we successfully synthesized relatively small (~5.3 nm) and uniform QDs via the hot-injection method by using PbCl2, S/Se powder and environmentally friendly oleylamine (OLA) as the precursors and/or solvent. By increasing the content of Se, the band gap of PbS1−xSexQDs decreased along with the decrease in the conduction band and valence band edges. The suitable energy level alignment enabled the efficient transfer of photoinduced charge carriers, and hence a much higher photoelectric conversion performance of the PbS1−xSex-QD@MWCNT/P3HT nanocomposites than the individual QDs, P3HT, and binary PbS1−xSex-QD@MWCNT, as well as the best performance, was achieved over PbS0.75Se0.25-QD@MWCNT/P3HT.Keywords:PbS1−xSexquantum dot;multiwalled carbon nanotube;P3HT;nanocomposite;charge transfer;photoelectric conversion
研究领域:
材料科学
·
纳米技术
·
光电化学
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 22
·12803-12813
·
IF 4.22
Ali M. R.,Bacchu M. S.,Al-Mamun M. R.,Rahman M. M.,Ahommed M. S.,Aly M. Aly Saad,Khan M. Z. H.
An electrochemical sensor based on molecular imprinted polymer (MIP) to detect ceftizoxime (CFX) with high sensitivity and selectivity is demonstrated. MIP was synthesized by electropolymerization of poly-cysteine (P-Cys) on a multi-walled carbon nanotube (MWCNT) modified glassy carbon electrode (GCE). A targeted drug was used as a template molecule during the polymerization process. The bare GCE was coated with a layer of MWCNT before the synthesis of MIP to improve the sensor sensitivity. Experimental parameters such as polymerization conditions, the influence of pH, molar ratio of the template molecules and the monomer molecules were all optimized. The peak potential exhibited linearity with CFX concentration in the ranges of 1 \(\times 10^{ - 9}\) –1× \(10^{ - 7}\) molL −1 ( R 2 = 0.9904) and 2× \(10^{ - 7}\) –1× \(10^{ - 4}\) molL −1 ( R 2 = 0.9949). The LOD of the MIP sensor was found to be \(1 \times 10^{ - 10}\) molL −1 under optimal conditions using a differential pulse voltammetry (DPV). The proposed sensor was tested on real samples, and good recovery results were obtained.
研究领域:
分析化学
·
药物分析
·
生物传感技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Xuejiao Liu,Wanwan Chen,Meiling Lian,Xu Chen,Yanluo Lu,Wensheng Yang
Metal-organic frameworks (MOFs) as a type of potential matrix for enzyme immobilization have attracted much interest. However, the sensitivity of most MOF-enzymatic electrochemical biosensors has not been satisfactory so far due to the poor conductivity and low apparent affinity of MOFs. In this work, new strategies have been presented: (i) using MOFs that themselves possess catalytic properties for substrates, so the synergistic catalysis by combining the MOFs and immobilized enzymes can be reinforced; (ii) introducing hydrophilic carbon nanomaterials and preparing MOF/carbon composites, not only the conductivity of the matrix but also the apparent affinity of immobilized enzyme for hydrophilic substrate can be remarkably enhanced. Horseradish peroxidase (HRP) and zeolite imidazolate framework-67(Co)/multi-walled carbon nanotube composite (ZIF-67(Co)/MWCNT) were adopted as the model enzyme and the immobilized matrix to illustrate and examine the proposed strategies. Compared with single component (ZIF-67(Co) or MWCNTs) based HRP electrochemical biosensors, the composite electrochemical biosensor displayed increased apparent substrate affinity (Michaelis constant K m reduced by ~75%) and 1.3-fold increased sensitivity in the detection of H 2 O 2 . The sensitivity (315 μA mM −1 cm −2 ) was also much larger than that of most previously reported MOF-HRP electrochemical biosensors. The proposed strategies are envisaged to be useful for other MOF-enzymes systems, which will be beneficial to the development of biocatalysis and biosensing.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 8
·1-15
·
IF 1.784
Yang Lu,Sun Zhuangzhi,Li Fei,Du Shanqi,Song Wenlong
To enhance the performance of ionic actuators, the electrochemical and electromechanical properties of green ionic actuators with the electrolyte layer after doping with MWCNT was investigated in this paper. The surface morphology, elemental composition, corresponding content and functional group of the mixed electrolyte layer were observed and characterized by SEM–EDS, FT-IR and XRD. The CV test showed that when the doping amount was 0.8 wt%, the specific capacitance increases 187.6% and 205.3% compared with undoped electrolyte layer at the sweep speed of 20 mV s −1 ,500 mV s −1 , respectively. The GCD test showed that the energy density increased to 144.3% at the current density of 1 A g −1 . and the cycle life is correspondingly increased. At 5 V DC, the deflection displacement of actuators was 10.12 mm when the doping amount was 0.8 wt%, which was 238.1% higher than when the doping amount was 1.5 wt%. And the output force of actuators was 3.10 mN, which was 147.2% higher than when the doping amount was 0 wt%. At 5 V/0.05 Hz voltage, the peak displacement of the actuator was 2.871 mm, which was 238.1% higher than when the doping amount was 1.5 wt%.
研究领域:
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 6
·1-11
·
IF 2.8
Fu Chenchao,Zhang Run,Tian Jing,Yang Qun,Xue Ping,Chen Xiaonong
A great many of important physical/chemical properties, containing thermal behavior and dynamic properties, are determined by polymer chain conformations. However, the cognition of how nanofillers impact polymer chains is still immature, especially for ultrahigh-molecular-weight polyethylene (UHMWPE) with extremely long molecular chains. Hence, cylindrical multi-walled carbon nanotubes (MWCNT) and lamellar graphene nanoplatelets (GNP) are applied to modify so as to investigate the effect of nanomaterials on UHMWPE chain conformations. The results of dynamic mechanical analysis authenticate that the less nanomaterials incorporated in UHMWPE enable to reduce the density of physical entanglement points, especially for the samples modified by GNP and MWCNT at the same time. Meanwhile, GNP and MWCNT added together in samples may also form a continuous structure, surrounding the UHMWPE molecular chains, and thus blocking the movement of the molecular chain. The reduction of physical entanglement points is beneficial to obtain a lower melting temperature, a higher crystallization temperature and an intenser molecular chains movement for UHMWPE composites. Compared with neat UHMWPE, the optimal performance of storage and loss modulus for UHMWPE/GNP/MWCNT composites is magnified by 169.33% and 100.01% respectively at 60 ℃, but both of them are much smaller than those of pure UHMWPE at higher than 140 ℃.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
·
2023
·
IF 1.9
Peng Wei,Zhiqiang Li,Yanan Zhang,Yumin Xia,Yanping Wang,Yimin Wang
Aromatic naphthalene thermotropic liquid crystal copolyesters (N-TLCP) have strong intermolecular forces and possess excellent comprehensive properties. In this study, the N-TLCP/MWCNT nanocomposites derived from 6-hydroxy-2-naphthoic acid (HNA), 2,6-naphthalene dicarboxylic acid (NDA), terephthalic acid (TA), 4,4′-dihydroxy biphenyl (BP) and carboxyl MWCNT were prepared via in situ “one-pot” melt polymerization method. The structure and properties of N-TLCP/MWCNT composites were fully analyzed. The interaction between MWCNT and TLCP matrix was confirmed by FTIR, XPS, Raman spectrum and rheometric measurements; and the strong interaction was observed for addition of a small amount of MWCNT (<0.5 wt%), which was attributed to the fact that the functional group COOH on the surface of MWCNTs enhances the dispersion state of the CNTs and molecular interaction through hydrogen bond/chemical covalent bonds. As a result, the glass transition temperature, melting temperature, thermal stability and mechanical properties of the N-TLCP/MWCNT composite was improved. However, more addition of MWCNT would tend to aggregate and impact the molecular weight and structure of the N-TLCP by the chemical reaction between its COOH group and OH group of the N-TLCP, which is not favor for improving the mechanical properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Peiqing Zhang,Sihang Li,Fan Xiao,Yongfang Xiao,Yi Zhang,Zhongguo Shan,Zhenyu Li,Haihua Wang
Membrane distillation (MD) represents a promising advance in wastewater purification, contributing to the mitigation of water scarcity. Hydrophobic poly(vinylidene fluoride) (PVDF) microporous membrane is susceptible to wetting by low surface tension substances, leading to fouling. To address this, PVDF membrane was superhydrophobically modified using modified ZIF-8 to obtain two composite membranes, AZ/PVDF and Z@C/PVDF. AZ/PVDF and Z@C/PVDF composite membranes were prepared by coating more dispersible APTES-ZIF-8 and ZIF-8@MWCNT, respectively, onto the surface of PVDF membrane. The hydrophobicity of the composite membranes was regulated by silane types, fluorination methods, and fluorination time, resulting in reduced surface roughness and increased surface energy. The contact angles of AZ/PVDF and Z@C/PVDF were 154.2 ± 3.4° and 156.8 ± 4.2°, respectively. Both AZ/PVDF and Z@C/PVDF membranes demonstrated outstanding mechanical, thermal, and chemical stability. AZ/PVDF and Z@C/PVDF membranes outperformed PVDF membrane, extending operation times by 2 h and 3 h, respectively, without obvious NaCl crystals. Furthermore, Z@C/PVDF membrane exhibited superior resistance to wetting by SDS than AZ/PVDF and PVDF membranes, treating pickle brine via the direct contact MD (DCMD) process with a recovery rate of 30.2 % within 10 h. Overall, this research offers a promising approach to fabricating superhydrophobic composite membranes for high-salt brine treatment via DCMD.
研究领域:
化学工程
·
材料科学
·
环境工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 21
·期 11
·3071-3082
·
IF 2.316
Liu Xin,Zhong Ji,Rao Hanbing,Lu Zhiwei,Ge Hongwei,Chen Bingyao,Zou Ping,Wang Xianxiang,He Hua,Zeng Xianyin,Wang Yanying
A novel molecularly imprinted electrochemical sensor based on Fe 3 O 4 @Au nanoparticles immobilized on amine-multi-walled carbon nanotubes by the strong chemisorption had been developed for detecting dipyridamole (DIP) in human serum using precipitation polymerization method. DIP can be detected by this electrochemical sensor through the response current change before and after binding DIP with the formation of hydrogen bonds. The experimental binding data for this study was modeled with the Freundlich isotherm (FI) equation, demonstrating the high imprinting efficiency. The molecularly imprinted electrochemical sensor based on Fe 3 O 4 @Au-MWCNT nanocomposite amplifies the response current in differential pulse voltammetry measurement, allowing the detection limit reaching 0.03 ng mL −1 in a wide linear range from 0.5 to 1900 ng mL −1 , which is remarkably better than those of currently used methods and the previous reports. Moreover, this molecularly imprinted electrochemical sensor has first been developed for the detection of DIP based on the Fe 3 O 4 @Au-MWCNT composite, which has a promising potential in the detection of DIP in human serum which enables low-cost, effective, and sensitive determination.
研究领域:
分析化学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Qiancheng Zhang,Zuojuan Du,Mingming Hou,Zizhao Ding,Xiaozhong Huang,Ailiang Chen,Yutian Ma,Sujun Lu,Xiu-Zhi Tang
The aerospace and fifth-generation (5G) networks have put forward higher requirements for broadband and high-efficiency of microwave absorbing materials. Herein, an ultralight and unidirectional honeycomb-like structural graphene/multiwalled carbon nanotube aerogel (GCA) with a wide microwave absorption bandwidth is fabricated through a simple directional freezing process followed by an annealing treatment. An absorption bandwidth of less than −10 dB is 13.32 GHz in the frequency range of 2–18 GHz. The bandwidth of reflection loss less than −20 dB reaches up to 13.5 GHz, covering the whole Ka-band (26.5–40 GHz) in the existing 5G millimeter-wave communication technology. Notably, a specific microwave absorption performance of 39654.63 dB cm 2 g −1 is obtained with a density as low as 3.34 mg cm −3 and thickness of 2 mm. Total carbon content and its reduction degree are the primary means to achieve the impendence matching-attenuation balance. The collective macroscopic arrangement of dipoles caused by the highly directional structures further modifies the interaction with electromagnetic waves. This work provides new inspiration and insight for ultralight and broadband microwave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Dawei Zhao,Qi Zhang,Wenshuai Chen,Xin Yi,Shouxin Liu,Qingwen Wang,Yixing Liu,Jian Li,Xianfeng Li,Haipeng Yu
Recent improvements in flexible electronics have increased the need to develop flexible and lightweight power sources. However, current flexible electrodes are limited by low capacitance, poor mechanical properties, and lack of cycling stability. In this article, we describe an ionic liquid-processed supramolecular assembly of cellulose and 3,4-ethylenedioxythiophene for the formation of a flexible and conductive cellulose/poly(3,4-ethylenedioxythiophene) PEDOT:poly(styrene sulfonate) (PSS) composite matrix. On this base, multiwalled carbon nanotubes (MWCNTs) were incorporated into the matrix to fabricate an MWCNT-reinforced cellulose/PEDOT:PSS film (MCPP), which exhibited favorable flexibility and conductivity. The MCPP-based electrode displayed comprehensively excellent electrochemical properties, such as a low resistance of 0.45 Ω, a high specific capacitance of 485 F g–1 at 1 A g–1, and good cycling stability, with a capacity retention of 95% after 2000 cycles at 2 A g–1. An MCPP-based symmetric solid-state supercapacitor with Ni foam as the current collector and PVA/KOH gel as the electrolyte exhibited a specific capacitance of 380 F g–1 at 0.25 A g–1 and achieved a maximum energy density of 13.2 Wh kg–1 (0.25 A g–1) with a power density of 0.126 kW kg–1 or an energy density of 4.86 Wh kg–1 at 10 A g–1, corresponding to a high power density of 4.99 kW kg–1. Another kind of MCPP-based solid-state supercapacitor without the Ni foam showed excellent flexibility and a high volumetric capacitance of 50.4 F cm–3 at 0.05 A cm–3. Both the electrodes and the supercapacitors were environmentally stable and could be operated under remarkable deformation or high temperature without damage to their structural integrity or a significant decrease in capacitive performance. Overall, this work provides a strategy for the fabrication of flexible and conductive energy-storage films with ionic liquid-processed cellulose as a medium.
研究领域:
材料科学
·
电化学
·
纳米复合材料
·
能源存储
·
柔性电子学
✓ 已验证
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Jin-Cheng Shu,Xiao-Yuan Huang,Mao-Sheng Cao
Effectively absorbing and converting electromagnetic (EM) energy for reutilization has an important implication in the fields of energy and environment. Herein, multi-walled carbon nanotubes (MWCNTs) are confinedly implanted into flower-like cobaltosic oxide (Co 3 O 4 ) to tailor the conductive network and polarization genes. It controllably tunes the EM property and optimizes the low-frequency microwave absorption. The minimum reflection loss reaches −61.4 dB at 3.44 GHz. A novel self-powered device is constructed to achieve the effective conversion from waste EM energy to useful electric energy. Energy conversion process inside flower-like Co 3 O 4 -MWCNT architecture is investigated, and the contribution of dielectric loss and magnetic loss to energy conversion is exhibited. This work provides a promising approach in combating EM pollution and alleviating energy problem.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）