MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Tao Hu,Man Zhang,Zhen Wang,Ke Chen,Xiao Li,Zhonghua Ni
Ultrasensitive detection of cancer biomarkers holds great promise for early stage detection and diagnosis of cancer. Microfluidic electrochemical immunochips have been assessed as powerful detection platforms due to their high sensitivity, low cost, portability, and ease of miniaturization. In this work, an ultrasensitive electrochemical immunochip based on MoS 2 /PDDA hybrid film is designed via layer-by-layer self-assembly method. An electrochemical impedance detection platform is developed for the detection of alpha-fetoprotein (AFP) by integrating a three-electrode system in the micro-channel, which introduces MoS 2 /PDDA film modified with antibodies as the working electrode, Ag/AgCl wire as the reference electrode and indium tin oxide (ITO) as the counter electrode. After MoS 2 /PDDA film is modified with AFP antibodies, the immobilization of various concentrations of AFP antigens is carried on which can cause changes in the electrochemical impedance value. This proposed approach exhibits a linear range from 0.1 ng/mL to 10 ng/mL and a low detection limit of 0.033 ng/mL (S/N = 3). The applicability of the MoS 2 /PDDA immunochip is further investigated by detecting human serum samples. This ultrasensitive microfluidic immunochip is proved to be highly selective with small input liquid volume, which could realize trace detection of AFP and be potentially applied in clinical diagnosis of other biomolecules.
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
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IF 5.155
Chaofeng Zhong,Wei Weng,Xinxin Liang,Dong Gu,Wei Xiao
Phase junction construction and surface modification are two practical engineering strategies towards efficient photocatalysis. In the present work, the A natase/ R utile biphasic TiO 2 nanoparticles@ M oS 2 nanosheets ( ARM ) heterojunctions were directly constructed via one-step pyrolysis of TiO(OH) 2 and (NH 4 ) 2 MoS 4 in LiCl-KCl molten salt. Phase junction is verified at the interface between anatase and rutile TiO 2 , which efficiently enhances spatial charge separation. With further incorporating MoS 2 over TiO 2 to facilitate kinetics of surface redox reactions, the ARM with an optimal MoS 2 weight ratio of 5% exhibits significantly enhanced photocatalytic activity towards solar-driven hydrogen evolution, achieving a hydrogen production rate comparable to the Pt/TiO 2 . The detailed characterization highlights the merits of molten-salt pyrolysis to modulate compositional/structural rationales of photocatalysts utilizing the synergistic effect of anatase/rutile phase junction and surface TiO 2 -MoS 2 heterojunction . The present study provides a facile approach to enable surface and interface engineering in one step.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Jianbin Lin,Han Fang,Xianhua Tan,Bo Sun,Ziyi Wang,Huidan Deng,Huan Liu,Zirong Tang,Guanglan Liao,Tielin Shi
Humidity sensors have attracted intense interest in various fields because of the importance of humidity detection. Different methods have been adopted to enhance sensing performances of humidity sensors, while it is challenging for researchers to avoid the invalidation of the sensors after being wet. Here, we, for the first time, introduce self-assembly MoS2/Cu(OH)2 nanowires fabricated by liquid self-spreading–coating–evaporating as sensing materials and present MoS2/Cu(OH)2 nanowire-based quartz crystal microbalance gamut humidity sensors with superior sensitivity and self-recovery ability. The sensors deliver a remarkable sensitivity (60.8 Hz/% RH) under a wide range (0–97% RH) with fast response (1.9 s)/recovery time (3.8 s) and upgrade self-recovery ability that can maintain their original performances even after being wet, frozen, and heated or immersed in water. The sensors are also employed to monitor water counting, dew alarming, and human breathing (within 4 s), further showing their ultrahigh sensitivity for water molecules. The underlying humidity-sensing mechanism is interpreted by density functional theory calculations and in-situ Fourier transform infrared spectra experiments adequately, revealing that the high sensing performances are attributed to abundant adsorption sites and physisorption of water molecules. Our work proposes a strategy for transferring materials to arbitrary nanostructures swiftly and demonstrates new perspectives for highly sensitive humidity detection as well as self-recovery ability.
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PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 30
·期 2
·1171-1191
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IF 6.123
Tu Chao,Sun Zenghui,Huang Fei,Wu Ziwei,Chen Hang
The photocatalytic process is an energy-saving and high-efficiency wastewater treatment technology. In this work, a simple in-situ hydrothermal method was used to prepare a photocatalytic material based on waste loofah with high efficiency, reusability and excellent heterostructure to improve the photodegradation efficiency. The prepared MoS 2 @MIL-101(Fe)@Carboxylated loofah composite material was characterized by scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS), UV–Vis diffuse reflection spectroscopy (UV–vis DRS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and transient photocurrent (TPC). The composite material demonstrated high adsorption capacity for hydrochloride (TC) and methylene blue (MB) and photocatalytic capacity under visible-light irradiation at room temperature which were attributed to the porous structure, strong visible-light absorption, and low recombination velocity of electron–hole pairs due to the heterojunctions. The loofah sponge used as a substrate can provide a means for powder catalyst recovery and waste cellulose recycling. Meanwhile, the photocatalyst proved excellent stability in the MB degradation experiment and could be reused for four cycles.
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CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Xiaoyue Chen,Yaru Wang,Xiangchao Meng
Electrocatalytic reduction of dinitrogen to produce ammonia at ambient conditions has increasingly attracted attentions. Molybdenum sulfide (MoS 2 ) exhibits promises in electrocatalysis. However, the lack of reactive sites significantly limited the electrocatalytic activity of MoS 2 when applied in the reduction of N 2 to produce ammonia. Herein, we successfully prepared a NiS x /MoS 2 heterostructural composite with abundant interfaces exposed. Moreover, the presence of metallic phase 1T-MoS 2 provided better conductivity and more active sites. Benefited from this interface design, as-prepared NiS x /MoS 2 composites exhibited excellent electrocatalytic activity in reduction of N 2 . The ammonia yield rate reached as high as 68.78 µg h −1 mg −1 cat. at −0.60 V ( vs. RHE) with a Faradic efficiency of 48.53 % at −0.50 V ( vs. RHE), as well as charming selectivity and long-term stability. The density functional theory (DFT) calculation results indicated that the heterointerface formed between NiS x /MoS 2 composites facilitated electrons transfer . And the adsorption of N 2 on the Mo site is more stable, which synergistically improves the NRR performance. This work provides new evidences of constructing heterojunction materials to accelerate electron transfer between interfaces for highly efficient electrocatalytic nitrogen reduction.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
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IF 10.9
Ailing Feng,Di Lan,Jinkun Liu,Guanglei Wu,Zirui Jia
With the rapid development of electronic technology, how to effectively eliminate electromagnetic pollution has become a serious problem. Perovskite oxides have shown great potential in the field of electromagnetic wave absorption due to their unique structure and excellent physicochemical properties. Herein, by rationally manipulating the A-site ion substitution strategy, the theoretically directed doping of Sr ions into La ionic sites was utilized and the layered MoS 2 was loaded by the hydrothermal process to modify its surface. Consequently, the introduced polarization phenomenon improved the dielectric performance of the perovskite oxides, achieving a collaborative dielectric/magnetic loss mechanism. Accordingly, the prepared La 0.7 Sr 0.3 FeO 3 (LSFO)/MoS 2 as coating filler in the epoxy resin coating system can obtain the minimum reflection loss of –67.09 dB at 1.9 mm and the maximum effective absorption bandwidth of 7.28 GHz at 2.3 mm. More importantly, it also exhibits excellent absorption performance for multi-band electromagnetic waves, covering a wide range of specified frequency bands. It provides inspiration for exploring novel perovskite oxide-based electromagnetic wave absorbing coatings and broadens the choice of ideal candidate materials for designing highly efficient, multi-band absorbers to cope with sophisticated electromagnetic environments.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 23
·6823-6831
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IF 5
Fangfang Huang,Songyue Zhang,Yuhong Chang,Wenwen Chen,Haishun Wu,Jianfeng Jia
In this work, using a synergistic modification strategy of facet engineering and constructing heterojunctions, MoS2/CdS Z-scheme heterojunction catalysts were successfully prepared. The results indicated that CdS-(100) exhibited enhanced photocatalytic benzylamine coupling activity relative to CdS-(002). Compared with pristine CdS, the photocatalytic activity of MoS2/CdS is significantly enhanced. This enhancement can be attributed to the presence of a Z-scheme heterojunction, which improves the separation efficiency of photogenerated carriers. Moreover, even after 5 cycles, the photocatalyst demonstrates a high photocatalytic activity, which proves that the existence of the Z-scheme heterojunction can effectively inhibit the photocorrosion of CdS. In addition, the reaction can be carried out in different reaction pathways under anaerobic and aerobic conditions. This work proposes a systematic approach for constructing MoS2/CdS Z-scheme heterojunction photocatalysts and the green synthesis of imines.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Yali Yao,Jinmei He,Xuedan Zhu,Leihuan Mu,Jiehui Li,Kanshe Li,Mengnan Qu
Rationally designing cost-efficient, high-activity and durable electrocatalysts are used for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is sense to solve the energy crisis and conversion. Herein, the heterostructure superwetting Co–MoS 2 /Ni 3 S 2 -GO/NF electrode is successfully fabricated by a typical hydrothermal reaction and it's electrocatalytic performance is also systematically studied. Thanks to the establishment of Co doped MoS 2 /Ni 3 S 2 heterojunction , the improvement conductivity by the addition of graphene oxide (GO), and the superhydrophilicity and superaerophobicity of microstructure, the electrode shows excellent catalytic characteristics and only need an overpotential of 123 mV for OER and 161 mV for HER to reach 10 mA cm −2 and can work steadily for 15 h in alkaline solution. Remarkebly, the superwetting heterojunction electrode demonstrated excellent overall water decomposition ability when used as bifunctional electrocatalyst in 1.0 M KOH and only 1.47 V is required to achieve 10 mA cm −2 . Density functional theory (DFT) calculations show the constructed heterogeneous interface and Co doping are conducive to optimizing the chemisorption energy of hydrogen-containing intermediates. This work provides a new way of thinking that collaborative optimization of electrode structure and surface wettability regulation to increase the active area of reaction and accelerate the bubble release toward high-performance OER and HER electrodes .
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
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IF 7.8
Xiaoqin Zhang,Jing Yang,Yueli Chen,Jia Tang,Aiping Zhang
Fe 0 and MoS 2 can synergistically activate H 2 O 2 to generate free radicals for the removal of refractory organic compounds. This study aims to evaluate the Fe 0 -H 2 O 2 -MoS 2 process for the removal of refractory organic compounds from bio-treated landfill leachate (BTL) under continuous operation mode . The results show that the dosage of H 2 O 2 , Fe 0 and MoS 2 all affect the removal effect of the Fe 0 -H 2 O 2 -MoS 2 process on refractory organics during continuous operation. The removal rates of total organic carbon , absorbance at 254 nm and chroma at an initial pH of 3, [H 2 O 2 ] of 5 mM, Fe 0 of 0.4 g/L, MoS 2 of 0.4 g/L and reaction time of 60 min were 65.83%, 85.11% and 93.14%, respectively. The Fe 0 -H 2 O 2 -MoS 2 process can not only effectively destroy the complex structure of refractory organic compounds in the BTL treatment but also reduce the biological toxicity of BTL to a certain extent. In addition, a high organic removal rate can still be maintained during the long-term dynamic reaction process. Therefore, the Fe 0 -H 2 O 2 -MoS 2 process has excellent performance in removing refractory organic compounds from BTL under continuous operation conditions.
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Journal of the Taiwan Institute of Chemical Engineers
·
2023
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IF 5.7
Yong Liu,Yekai Zhang,Mengbi Zhang,Hong Zhong,Zhanfang Cao,Liqing Li
Background Hydrogen energy, as the most promising renewable resource in the future, is severely limited in its development due to electrocatalysts, so the preparation of highly efficient and low-cost non-precious-metal catalysts is crucial for large-scale hydrogen production via electrolysis of water. Methods Herein, Ni 3 S 2− MoS 2 @CoMoO 4 /NF was successfully synthesized for the first time by in situ ion-exchange reaction and sulfidation reaction using Co-MOF/NF as a template. Significant Findings The electrochemical tests revealed that the overpotential was only 62.4 mV at a current density of 10 mA cm −2 , which was similar to that of the noble metal Pt sheet electrode, the long-term durability of the catalysts was more than 24 h at a constant potential, which demonstrated that the catalysts possessed excellent HER performance in alkaline media. In addition, XPS, SEM, XRD, and Raman characterization also demonstrated the successful growth and loading of Ni 3 S 2 , MoS 2 , and CoMoO 4 . In this study, transition metal sulfides and transition metal sulfide complexes with good electrochemical properties were prepared using metal-organic frameworks (MOFs) as precursors, providing a new idea for the preparation of HER catalysts with high activity in alkaline media.
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高影响因子
ANALYST
·
2023
·Vol. 148
·期 20
·4995-5001
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IF 4.2
Weixin Li,Xinyang Wang,Lifen Chen,Fang Luo,Longhua Guo,Cuiying Lin,Jian Wang,Bin Qiu,Zhenyu Lin
Two-dimensional (2D) layered MoS2 has good dispersion and adsorption properties, but being a narrow bandgap semiconductor limits its application in photoelectric sensing. In this study, a homogeneous photoelectrochemical sensor based on three-dimensional (3D) ZnO/Au/2D MoS2 is proposed for the ultrasensitive detection of tetracycline (TET). MoS2 is uniformly embedded on the 3D ZnO/Au surface by ordered self-assembly. The physical method of π–π interaction of MoS2 replaces the conventional use of chemically modifying aptamers on the electrode material surface. Under optimal conditions, this method has been successfully applied to the detection of TET in milk, honey, pig kidney and pork samples with reliable results. We believe that this study presents a method for the preparation of sensing carriers and target detection with great potential for application.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Sisi Chen,Siyi Chen,Jiali Lan,Hongxiang Qin,Shuang Yang,Pan Wang,Yong You
In this work, a novel nanoparticle ((MoS 2- BT)@ (PDA+PEI)) was constructed through two-dimensional molybdenum disulfide (MoS 2 ) and zero-dimensional barium titanate (BT) via in-situ polymerization and co-modification of polydopamine (PDA) and polyethylenimine (PEI). Then the nanofillers were dispersed in the Polyarylene ether nitrile (PEN) matrix by film casting to obtain PEN/(MoS 2 -BT)@ (PDA+PEI) nanocomposite dielectric films. Subsequently, the latter were subjected to chemical crosslinking at high temperature to obtain CPEN/(MoS 2 -BT)@ (PDA+PEI) nanocomposites. The effects of filler content on the properties of PEN matrix composite films were investigated. The results indicate excellent compatibility between (MoS 2 -BT)@ (PDA+PEI) and the PEN matrix due to the introduction of an organic modification layer, resulting in overall good performance of nanocomposite films , including good thermal stability with a glass transition temperature ( T g ) exceeding 240 °C after chemical crosslinking. The dielectric constant of CPEN nanocomposites containing 40 wt% of the hybrid nanoparticles is 20.2 and the dielectric loss is 0.032 at 1 kHz, the dielectric constant-temperature coefficient of all CPEN nanocomposites is less than 6 × 10 −4 °C −1 at the temperature range of 25–220 °C. In short, the incorporation of (MoS 2 -BT)@ (PDA+PEI) effectively enhances the thermal, mechanical, and dielectric properties of PEN-based nanocomposites.
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