POLYMERS FOR ADVANCED TECHNOLOGIES
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2019
·Vol. 30
·期 4
·879-888
·
IF 2.162
Rui Gao,Shuguang Wang,Keqing Zhou,Xiaodong Qian
In the present work, a facile and environmental method was developed to fabricate the novel functionalized MoS 2 hybrid. Firstly, MoS 2 nanosheets were coated with polydopamine (PDA) through the self-polymerization of dopamine (MoS 2 -PDA) in a buffer solution. Then the decoration of Ni(OH) 2 on the MoS 2 -PDA was synthesized because of the strong affinity of Ni 2+ with hydroxyl groups in PDA. Finally, the as-synthesized MoS 2 -PDA@Ni(OH) 2 was introduced into poly(lactic acid) (PLA) matrix to explore flame retardancy, thermal stability, and crystalline property of the composites. As confirmed by X-ray diffraction (XRD), Fourier-transform infrared spectrometer (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), the MoS 2 nanosheets were dually modified with PDA and Ni(OH) 2 without destroying the original structures. The thermal degradation of PLA with MoS 2 -PDA@Ni(OH) 2 generated a notably higher yield of char. Moreover, the crystallization rate of composites is higher than neat PLA. The cone calorimeter test revealed that the introduction of 3% MoS 2 -PDA@Ni(OH) 2 resulted in lower Peak Heat Release Rate (PHRR) (decreased by 21.7%). Thus, the research provided an innovative functionalization method for manufacturing PLA composites with high performances.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Yingying Jiao,Qunzeng Huang,Jianshe Wang,Zhanhang He,Zhongjun Li
A novel MoS 2 quantum dots (QDs) decorated g-C 3 N 4 nanosheet/N-doped carbon dots (NCDS) heterojunction photocatalyst was successfully synthesized by thermal polymerization and subsequent solvothermal approach. Under visible light (λ ≥ 420 nm) irradiation, the as-prepared g-C 3 N 4 /NCDS/MoS 2 composite with 3wt% of MoS 2 and 2wt% of NCDS displayed the highest photocatalytic hydrogen evolution activity with a corresponding H 2 evolution rate of 212.41μmol g −1 h −1 , which was about 53 times higher than that of g-C 3 N 4 /MoS 2 -3%. Moreover, the g-C 3 N 4 /NCDS/MoS 2 composite exhibited excellent photostability. The enhanced photocatalytic activity of g-C 3 N 4 /NCDS/MoS 2 composite was predominantly attributed to the formation of Z-scheme heterojunction between g-C 3 N 4 and NCDS, which effectively accelerated the transfer and separation of photogenerated charge carriers. Besides, the introduction of noble metal-free MoS 2 co-catalyst further promoted the separation of photogenerated charge carriers and provided more active sites for H 2 evolution reaction. The advantages of superior photocatalytic activity and excellent stability endowed a promising potential for g-C 3 N 4 /NCDS/MoS 2 composite to apply in photocatalytic fields.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yajie Wang,Yuan Kai,Lifeng Tong,Yong You,Yumin Huang,Xiaobo Liu
To obtain high performance dielectric composites, novel functionalized MoS 2 nanosheet/poly(arylene ether nitrile) (PEN) nanocomposite films were demonstrated. For this purpose, the MoS 2 nanosheets prepared by hydrothermal method were modified via mussel inspired co-modification and crosslinking of polydopamine (PDA) and polyethylenimine (PEI), followed by incorporating into the PEN matrix to form the MoS 2 @(PDA + PEI)/PEN nanocomposite films through a simple solution casting method. The surface modification of MoS 2 nanosheet was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and transmission electron microscopy (TEM). The effect of functionalized MoS 2 mass fraction on the performance of PEN composites was also detailed investigated. Owing to the well interfacial compatibility between MoS 2 nanosheet and PEN matrix, the resulting PEN nanocomposite film with 10 wt% MoS 2 @(PDA + PEI) exhibited excellent comprehensive performance, including high dielectric constant of 8.3, low dielectric loss of 0.02 at 1 kHz and outstanding frequency stable. Moreover, it also showed excellent thermal stability ( T 5% > 490 °C) and mechanical properties that the tensile strength and modulus reached 120.3 MPa and 2468.2 MPa, respectively. Such remarkable performance may be suitable for dielectric applications in special demand. Our study provides a new strategy to obtain high-performance dielectric materials.
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Advanced Optical Materials
·
2019
·Vol. 7
·期 11
·1801744
·
IF 7.125
Louwen Zhang,Shaoli Shen,Man Li,Luying Li,Jibin Zhang,Lianwei Fan,Feng Cheng,Chen Li,Meng Zhu,Zhe Kang,Jun Su,Tianyou Zhai,Yihua Gao
The past several years have seen the rapid development of fully inorganic trihalide perovskite nanocrystals (PNCs) in the field of hybrid optoelectronic devices due to their outstanding photophysical properties and environmental stability. In this study, novel and easily implementable strategies are proposed to regulate the photoresponse performance of monolayer MoS 2 /PNC hybrid photodetectors (HPs) without the photogating effect. The optoelectronic properties of these HPs are tuned by regulating the characteristic factors of colloidal PNCs (solution concentration and surface ligand content), which are closely associated with the light-trapping ability of the perovskite layer and charge transfer efficiency at the heterojunction interface. Moreover, oxygen adsorbates are found to exhibit a typical p-type behavior and play a decisive role in the improvement of response rate of the HPs. In the air, the HPs present a high photoresponsivity of 6.40 × 10 5 mA W −1 , an external quantum efficiency of 1.50 × 10 5 %, and a specific detectivity of 3.38 × 10 11 Jones when the gate voltage is zero. The HPs also exhibit excellent thermal stability and operation durability, largely due to the intrinsic stability of PNCs. The present work provides promising strategies for regulating/optimizing the performance of advanced functional devices with mixed-dimensional heterojunctions.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Shaoxia Wang,Jing Li,Yang Qiu,Xuming Zhuang,Xuran Wu,Jing Jiang
Copper is one of the essential trace elements in human body which plays a vital role in the processes of fundamental physiology. Therefore, analysis and detection of copper ions has attracted tremendous attention. In this paper, an electrochemical sensor was successfully developed based on 5-sulfosalicylic acid modified nanocomposite of molybdenum disulfide nanosheets and oxidized multi-walled carbon nanotubes (SSA/MoS 2 /o-MWCNTs). The nanocomposite was characterized by scanning electron microscopy, transmission electron microscopy , element mapping, X-ray diffraction, Fourier transform infrared spectroscopy , X-ray photoelectron spectroscopy, Raman spectroscopy , and electrochemical measurements. Then, nanocomposite-modified glassy carbon electrode was used for the detection of Cu 2+ . Electrochemical analysis of Cu 2+ was performed by differential pulse voltammetry , and the effects of pH, deposition potential, and deposition time were investigated. The results showed that the peak current increased linearly with increasing Cu 2+ concentration over the range of 0.1–11 μM and a detection limit of 0.057 μM (S/N = 3). Finally, the developed sensor was applied for the analysis of Cu 2+ in lake water and dairy products, and the results were consistent with the results of ICP-MS analysis. Therefore, this work demonstrates that the proposed electrochemical sensor can be easily used for the daily monitoring of Cu 2+ .
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-9
·
IF 5.479
Kong Weisu,Li Qin,Xia Lian,Li Xiaomeng,Sun Han,Kong Rong-Mei,Qu Fengli
A photoelectrochemical (PEC) method has been developed for sensitive detection of trypsin. It is based on the use of a composite consisting of MoS 2 nanosheets and TiO 2 nanorods (MoS 2 -TiO 2 ). The material has a high specific surface area, superior electrical conductivity, excellent biocompatibility and good band gap matching. The composite was synthesized by a one-pot method using TiO 2 as a template. This results in a uniform distribution of the MoS 2 nanosheets (<5 layers) in the composite. If the composite, placed on an indium tin oxide (ITO) electrode, is coupled to apoferritin, the photocurrent response decreases due to the insulating effect of the protein. Trypsin, in acting as an alkaline protease, decomposes the apoferritin. This results in the recovery of the PEC signal. Attractive features of this PEC method include (a) a superior PEC signal, (b) sensor stability, (c) simple operation, and (d) the lack of any additional modifications of the biosensor. This warrants high sensitivity, reproducibility, repeatability and practicality. The ITO sensor has a linear response in the 1 to 1000 ng·mL −1 trypsin concentration range and a 0.82 ng·mL −1 detection limit. The assay was applied to the determination of trypsin in spiked serum samples and gave satisfactory results.
Schematic presentation of an indium tin oxide (ITO)/MoS 2 -TiO 2 sensor for detecting trypsin. The PEC signal was decreased after immobilization of apoferritin (APO) on the modified ITO. Trypsin catalytically hydrolyzes APO specifically and induces the PEC signal to recover.
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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-11
·
IF 5.479
Zhou Yanfen,Zhao Mengxin,Meng Zhe,Wang Zelan,Men Xiuqin,Li Jiguang,Li Heping,Yang Jinhui
A magnetic graphene-like molybdenum disulfide nanocomposite was prepared by liquid-phase exfoliation and hydrothermal synthesis. The morphology, structure, and magnetic behavior of the nanocomposite were characterized by X-ray diffraction, FTIR spectroscopy, thermogravimetric analysis, vibrating sample magnetometry, scanning electron microscopy and transmission electron microscopy. The nanocomposite was employed as a sorbent for magnetic solid-phase extraction (MSPE) of eight triazine and ten sulfonylurea herbicides from environmental water and corn samples. Specifically, this was studied with cyanazine, simetryn, atrazine, methoprotryne, ametryn, prometryn, terbutryn, dipropetryn, metsulfuron-methyl, sulfometuron-methyl, amidosulfuron, rimsulfuron, nicosulfuron, bensulfuron-methyl, halosulfuron-methyl, pyrazosulfuron-ethyl, chlorimuron-ethyl, and cyclosulfamuron. The parameters affecting extraction efficiency (sorbent amount, pH value of the sample, extraction and elution conditions) were studied and optimized. Following MSPE, the multi-residue herbicides were quantified by ultra-high performance liquid chromatography combined with ion trap mass spectrometry and electrospray ionization. The limits of detection range between 20 and 170 ng·L −1 . The extraction recoveries of eighteen herbicides from corn samples were in the range between of 64.7% and 103.1%, with RSDs of <17.6%.
Schematic presentation of magnetic graphene-like MoS 2 nanocomposite as an absorbent for simultaneous preconcentration of eight triazine and ten sulfonylurea herbicides in corn and water prior to ultra-high performance liquid chromatography (UHPLC) with ion trap mass spectrometry detection.
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BIOSENSORS & BIOELECTRONICS
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2019
·
IF 9.518
Renyue Ji,Wuceng Niu,Shuai Chen,Wei Xu,Xingduo Ji,Lingyue Yuan,Hangyu Zhao,Minghao Geng,Jingfu Qiu,Chaorui Li
In this work, a novel Pb 2+ electrochemical DNAzyme sensor was developed for ultrasensitive detection of lead ions (Pb 2+ ) in water environment by coupling with the MoS 2 –AuPt nanomaterials and hemin/G-quadruplex DNAzyme, which acting as the electrocatalytic signal tag. Streptavidin (SA) modified tin dioxide-functionalized reduced graphene oxide (rGO-SnO 2 ) /gold nanoparticles (AuNPs) served as a sensor platform for enhancing conductivity and immobilizing more Pb 2+ -specific DNAzyme. In the presence of Pb 2+ , the Pb 2+ -dependent DNAzyme specifically reacted with Pb 2+ , cleaving the substrate strand (SS) into two free fragment and releasing the biotin-modified enzyme strand (Bio-ES) on the electrode. Connecting MoS 2 –AuPt nanocomposites labeled with G-rich DNA (G-DNA) strand and exposure of Bio-ES through the Helper DNA, as well as adding hemin to form a hemin/G-quadruplex, the biosensor achieved signal amplification . Chronoamperometry was used to record the current signal, which was primarily derived from the cocatalysis reduction of H 2 O 2 by MoS 2 –AuPt nanocomposites and the hemin/G-quadruplex. Under optimal conditions, the designed biosensor exhibited sensitive detection of Pb 2+ from 0.1 pg mL −1 to 1000 ng mL −1 , with a lower detection limit of 38 fg mL −1 (based on 3σ). This proposed biosensor is ultrasensitive and specific, representing a potential application for the detection of Pb 2+ in a water environment.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Maoqiang Chi,Yun Zhu,Liwei Jing,Ce Wang,Xiaofeng Lu
Over the past few years, nanomaterials-based enzymatic mimics have attracted tremendous attention due to their excellent catalytic activity and environmental stability. In this work, ternary MoS 2 -polypyrrole (PPy)-Pd nanotubes have been prepared through a hydrothermal reaction and in situ redox polymerization process between pyrrole monomer and Na 2 PdCl 4 . The prepared MoS 2 -PPy-Pd nanotubes exhibited a higher peroxidase-like catalytic activity than individual MoS 2 , MoS 2 -PPy, PPy-Pd and MoS 2 -Pd nanocomposites due to the synergistic catalytic effect between the three components. The catalytic kinetic of MoS 2 -PPy-Pd nanotubes follows Michaelis-Menten behaviors, exhibiting a good affinity to both 3,3′,5,5′-tetramethylbenzidine (TMB) and H 2 O 2 substrates. On the basis of high peroxidase-like catalytic efficiency of the MoS 2 -PPy-Pd nanotubes, a simple and convenient colorimetric strategy for the rapid and sensitive detection of l -cysteine with a detection limit of 0.08 μM has been developed. In addition, a high selectivity towards the detection of l -cysteine is achieved. This work present an opportunity of the prepared ternary MoS 2 -PPy-Pd nanotubes for promising potential applications in biosensing, environmental monitoring, and medical diagnostics.
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高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 6
·1-8
·
IF 5.705
Song Kaijing,Ding Chuanmin,Zhang Bing,Chang Honghong,Zhao Zhihuan,Wei Wenlong,Wang Junwen
The authors describe a dye-sensitized photoelectrochemical immunoassay for the tumor marker carcinoembryonic antigen (CEA). The method employs the rhodamine dye Rh123 with red color and absorption maximum at 500 nm for spectral sensitization, and a 3D nanocomposite prepared from graphene oxide and MoS 2 acting as the photoelectric conversion layer. The nanocomposite with flower-like 3D architectures was characterized by transmission electron microscopy, scanning electron microscopy, X-ray powder diffraction, and UV-vis diffuse reflectometry. A photoelectrochemical sandwich immunoassay was developed that is based on the use of the nanocomposite and based on the specific binding of antibody and antigen, and by using a secondary antibody labeled with Rh123 and CdS (Ab 2 -Rh123@CdS). Under optimal conditions and at a typical working voltage of 0 V (vs. Hg/HgCl 2 ), the photocurrent increases linearly 10 pg mL −1 to 80 ng mL −1 CEA concentration range, with a 3.2 pg mL −1 detection limit.
Flower-like GO-MoS 2 complex with high efficiency of electron transport was synthesized to construct photoelectrochemical platform. The sandwich-type immunoassay was built on this platform based on specific binding of antigen and antibody. Carcinoembryonic antigen in sample was detected sensitively by using sensitization of rhodamine dye Rh123 as signal amplification strategy.
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高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2018
·
IF 4.66
Jianing Dong,Xinnan Zhang,Jianying Huang,Shouwei Gao,Jiajun Mao,Jingsheng Cai,Zhong Chen,Sanjayan Sathasivam,Claire J. Carmalt,Yuekun Lai
MoS 2 quantum dots (QDs) are loaded onto TiO 2 nanotube arrays (NTAs) via a facile strategy of combining electrochemical exfoliation with electrophoretic deposition (EFED). The optimal MoS 2 @TiO 2 NTAs exhibits a low onset potential (76 mV vs RHE) with the Tafel slope of 93 mV dec −1 . The reported synthesis strategy is suitable for the heterojunction construction of other two-dimensional layered materials and semiconductor composites with excellent photoelectric properties .
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高影响因子
ChemSusChem
·
2018
·Vol. 11
·期 23
·4060-4070
·
IF 7.411
Huimin Zhou,Xin Xia,Pengfei Lv,Jin Zhang,Xuebin Hou,Min Zhao,Kelong Ao,Di Wang,Keyu Lu,Hui Qiao,Malgorzata Zimniewska,Qufu Wei
Graphical Better anode by design : A designed anode structure combining the metallic conductivity of 1T-MoS 2 with interconnected TiO 2 /MoO 3 grains is beneficial for fast charge-transfer reactions and reduced transmission losses. Moreover, a flexible carbon framework buffers swollen lithium compounds, such as Li x MoO 3 and Li x MoS 2 , and supports the shrinking delithiated products, with potential for achieving high capacity stability in both Li- and Na-ion batteries. Integrating layered nanostructured MoS 2 with a structurally stable TiO 2 backbone to construct reciprocal MoS 2 /TiO 2 -based nanocomposites is an effective strategy. C@TiO 2 /MoO 3 composite nanofibers doped with 1T-phase MoS 2 nanograins were fabricated by partially sulfurizing MoO x /TiO 2 precursors. By controlling a suitable preoxidation temperature before severe thermolysis of polyvinylpyrrolidone (PVP), the MoO x /TiO 2 precursors formed a polymer-embedded array through coordination of the Mo source and pyrrolidyl groups of PVP. Sulfidation under water/solvent hydrothermal conditions led to partial formation of metallic 1T-phase MoS 2 from the MoO x precursor with preoxidation at 200 °C. After carbonization, the TiO 2 /MoO 3 /MoS 2 nanograins were encapsulated in a carbon backbone in a vertical pattern, providing both chemical contact for confined electron transport and sufficient space to adapt to volume changes. The obtained carbon-based platform not only has the advantages of an integral structure, but also exhibited ultrastable specific capacities of 540 and 251 mAh g −1 for Li-ion batteries and Na-ion batteries, respectively, after 100 cycles.
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