Journal of Materials Chemistry A
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2020
·Vol. 8
·期 29
·14506-14518
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IF 11.301
Bai Xue,Shengdu Yang,Xin Sun,Lan Xie,Shuhao Qin,Qiang Zheng
The development of polymer-based thermal management materials (TMMs) is crucial to address the frequency reduction or overheating damage of modern electronics caused by inadequate thermal conductivity of substrates. However, high interfacial thermal resistance between filler and filler or between filler and matrix creates paramount bottlenecks for the prominent thermal conduction in polymer-based composites. Herein, novel tanghulu-like MoS2–SiC nanowire (L-MoS2–SiCNW) and cattail-like H-MoS2–SiCNW hybrids are successfully fabricated via a facile hydrothermal method, and then incorporated into a green cellulose nanofiber (CNF) matrix by a vacuum-assisted filtration approach. MoS2 nanosheets tightly rooted to the surface of SiCNWs can bridge the gap between SiCNWs and increase the contact area between them, which consequently leads to the large reduction of interfacial thermal resistance. As a result, the maximum in-plane TC of 19.76 W m−1 K−1 is attained for the flexible CNF/H-MoS2–SiCNW film at a relatively low filler content of 22.5 vol%, which has an enhancement of 1408% in contrast to that of the pure CNF film. In addition, the volume resistivity of the flexible CNF/H-MoS2–SiCNW film is two orders of magnitude higher than that of pure CNF, which is far above the required resistance for electrical insulation. In the real TMM application measurement of CNF/H-MoS2–SiCNWs, the temperature of the CPU core with the CNF/H-MoS2–SiCNW heat spreader is elevated more slowly than that of the bare case (e.g.: Δ = 4.9 °C at 980 s). Thus, this investigation provides a valuable insight into the design and fabrication of favorable polymer-based TMMs for potential applications in microelectronics and advanced energy.
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TALANTA
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2020
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IF 5.339
Jingju Liu,Xiaoyan Lin,Mimi Sun,Bing Du,Lei Li,Jing Bai,Ming Zhou
The flower-like porous In 2 O 3 pompon assembled from two-dimensional (2D) nanosheets was synthesized through a simple thiourea-assistant hydrothermal method following the annealed process. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images manifest that the In 2 O 3 pompon possesses a clear porous structure with a nanosheet thickness of about 37.5 nm. Further, we compare the performance of intermediate products (In 2 S 3 , In 2 S 3 /In 2 O 3 ) and In 2 O 3 nanostructures as ethanol detection gas sensors. The fabrication of In 2 O 3 -based sensors exhibits enhanced ethanol sensing performance than that of In 2 S 3 /In 2 O 3 -based and In 2 S 3 -based sensors, which is mainly attributed to more chemical oxygen and oxygen vacancies on the material surface. The In 2 O 3 -based sensors for ethanol detection revealed a wide linear range from 2 ppm to 100 ppm, meanwhile the corresponding detection limits (LOD) as low as ~0.4 ppm at 260 °C. And the In 2 O 3 -based sensors also exhibit superior repeatability and reliable selectivity. The simple fabrication strategy of 2D nanosheets-assembled flower-like In 2 O 3 porous pompon may facilitate other ethanol gas sensors production and other 2D metal oxide semiconductor materials-based sensors preparation.
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Sustainable Chemistry and Pharmacy
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2020
·
IF 3.294
Liang Zhang,Yichen Zhao,Chaoqun Mu,Xiaomin Zhang
A magnetic adsorbent was prepared by polydopamine coating and thiourea grafting on carbon-modified discarded fly ash magnetic beads (TPCMFA). The successfully preparation of the TPCMFA was supported by SEM image, XRD, FT-IR and Raman spectroscopy . Batch adsorption experiments reveal that the adsorption of silver ions on this magnetic sorbent TPCMFA agreed with the Langmuir isotherm model, with a maximum absorbability of 94.94 mg g -1 . Kinetics data revealed that the adsorption of silver ions on TPCMFA conform to a pseudo-second-order. The TPCMFA achieved remarkable selectivity for Ag (I) that was almost five times higher than that for ions of copper, zinc and nickel. After three cycles, the adsorption capacity of TPCMFA remained at 93.5% of the adsorption capacity of the initial material. These results show that this new magnetic adsorbent prepared from discarded fly ash magnetic beads has promising commercial prospects.
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FOOD CHEMISTRY
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2020
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IF 6.306
Baolei Dong,Hongfang Li,Jiefang Sun,Ghulam Mujtaba Mari,Jun Ai,Diangang Han,Xuezhi Yu,Kai Wen,Jianzhong Shen,Zhanhui Wang
Herein, we proposed a duplex and homogeneous fluorescent immunoassay for the simultaneous detection of amantadine (AMD) and chloramphenicol (CAP) residue in chicken breast with both high sensitivity and short assay time. The immunoassay was based on the fluorescence resonance energy transfer (FRET) between hapten-labeled carbon dots (CDs) and antibody-modified WS 2 nanosheets. To achieve the duplex FRET , polyethyleneimine-functionalized blue and green emissive CDs with separated emission were synthesized via a one-pot hydrothermal method and directly coupled with the haptens of AMD and CAP, serving as the energy donors. The antibodies were modified on the surface of WS 2 nanosheets with high quenching efficiency to construct the energy acceptor. The specific immunoreaction could trigger the efficient FRET between the donors and the acceptors, causing the fluorescence quenching of CDs. The developed immunoassay was applied to simultaneously detect AMD and CAP, having the detection limit of 0.10 ng g −1 and 0.06 ng g −1 , respectively.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Yingxu Chen,Jie Gao,Kai Yan,Xiaoling Yao,Yong Liu,Jingdong Zhang
A photocatalytic fuel cell (PFC) coupling with competitive immunoassay was designed for self-powered sensing of platelet derived growth factor-BB (PDGF-BB). In the PFC, the effective oxidation of ascorbic acid (AA) on a photoanode under visible light illumination and catalytic reduction of [Fe(CN) 6 ] 3− on a cathode generated electrical output. In order to realize the specific detection of PDGF-BB, the antibody of PDGF-BB (Ab) was immobilized on photoanode to act as the recognition element. Meanwhile, a bioconjugate, PDGF-BB@AuNPs@dopamine–melanin nanosphere, was used as the competitive element of target which could dramatically reduce the output of PFC by blocking the transfer of AA to the photoanode. When the target PDGF-BB coexisted with the bioconjugate, the competitive binding of smaller target molecule with Ab immobilized on photoanode could reduce the binding amount of bioconjugate and induce an elevated output of PFC. Under the optimum condition, the output of PFC was linearly proportional to the logarithm of PDGF-BB concentration from 20 pg mL -1 to 200 ng mL -1 , with a detection limit (3S/N) of 6.2 pg mL -1 . Moreover, the developed self-powered competitive immunosensor was successfully applied to the detection of PDGF-BB in human serum.
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Energy Storage Materials
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2020
·
IF 16.28
Sha Li,Pan Xu,Muhammad Kashif Aslam,Changguo Chen,Arif Rashid,Gulian Wang,Li Zhang,Bingwei Mao
Li–S batteries have received unprecedented attention owing to their exceptionally high energy density and low cost. Nevertheless, the daunting challenges of insulating properties, soluble polysulfide shuttling, drastic volume change and sluggish polysulfide conversion kinetics, still hinder their application towards commercialization . Very recently, exciting progresses have been made on inorganic/organic polar hosts as either polysulfide immobilizers or polysulfide redox accelerators, targeting durable Li–S batteries. Herein, self-assembled NiCo 2 S 4 granules comprising secondary open-hole tubular structures are first devised as highly-efficient host materials for high-sulfur-loading and durable Li–S batteries. NiCo 2 S 4 hosts are featured with their large porosity, high electronic conductivity , rapid ion conduction, strong polysulfide immobilization capability and catalytic effect on polysulfide redox, thus greatly ameliorating the polysulfide-shuttle issue and accelerating the polysulfide conversion kinetics. Therefore, the NiCo 2 S 4 /S cathode shows a reversible capacity of 1387 mAh g −1 at 0.2C and retains a value of 543 mAh g −1 after 500 cycles at 2 C. Impressively, the NiCo 2 S 4 /S cathode with a sulfur loading of 8.9 mg cm −2 exhibits high areal capacity of 8.3 mAh cm −2 , low polarization and high cycling stability. Moreover, the as-derived soft-package battery with a 4.5 mg cm −2 sulfur loading can power 169 light-emitting diodes, verifying its great potential for practical application.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Benteng Sun,Zhangqian Liang,Yeye Qian,Xuesong Xu,Ye Han,Jian Tian
Here, we reported that sulfur vacancy-rich O-doped 1T-MoS2 nanosheets (denoted as SV-1T-MoS2) can surpass the activity of Pt as cocatalysts to assist in the photocatalytic nitrogen fixation of CdS nanorods. SV-1T-MoS2 cocatalysts exhibit sulfur vacancies, O-doping, more metallic 1T phase, and high electronic conductivity, thus leading to the exposure of more active edge sites, high Brunauer–Emmett–Teller surface area, enhanced visible light absorption, and improved electron separation and transfer, which are beneficial for photocatalytic nitrogen fixation. Consequently, the optimized 30 wt % SV-1T-MoS2-/CdS composites exhibit an outstanding nitrogen fixation rate of 8220.83 μmol L–1 h–1 g–1 and long-term stability under simulated solar light irradiation, significantly higher than pure CdS nanorods, CdS–Pt (0.1 wt %), and 30 wt % 1T-MoS2/CdS composites. The catalytic mechanism of photocatalytic nitrogen fixation on SV-1T-MoS2 is discussed by density functional theory calculations.
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MICROCHIMICA ACTA
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2020
·Vol. 187
·期 2
·1-9
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IF 6.232
Xiang Ling,Zhang Feng,Feng Jian,Chen Chunyan,Cai Changqun
A method is described for the simultaneous determination of hepatocellular carcinoma-associated microRNA-122 and microRNA-199a/b-3p. This probe consists of two kinds of nanomaterials. The first comprises CdTe@CdS core-shell quantum dots which, on excitation at 375 nm give two emissions, with peak wavelengths at 543 (g-QDs) and at 627 nm (r-QDs). The second comprises gold nanoparticles acting as a quencher. In the absence of the target, g-QD-N1 and r-QD-N2 are stable due to the fluorescence stability. With the addition of microRNA-122 and microRNA-199a/b-3p, g-QD-N1 and r-QD-N2 are conjugated to the surface of AuNP-S1/S2 through base complementary pairing. As a result, fluorescence resonance energy transfer (FRET) occurs, resulting in a decrease at 550 nm and 635 nm respectively, which can realize the simultaneous detection of two different microRNAs. Detection is achieved within 50 min. The detection limits (3σ/k) are 0.2 nM for microRNA-122 and 0.5 nM for microRNA-199a/b-3p. The clinical applicability of the assay was demonstrated by detecting microRNAs in human serum and different cell lysates.
Schematic for the simultaneous determination of microRNA-122 and microRNA-199a/b-3p by FRET.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Chao Xiong,Shixing Wang,Peng Hu,Liyun Huang,Can Xue,Zujin Yang,Xiantai Zhou,Yongqing Wang,Hongbing Ji
We report an efficient, reusable, and selective 6-aminothiouracil (ATA)-modified Zr(IV)-based adsorbent (defined as UiO-66-ATA(Zr)) for lead ion removal in water. The adsorption equilibrium time and the maximum sorption capacity of UiO-66-ATA(Zr) for Pb(II) are, respectively, 120 min and 386.98 mg/g at pH 4 and 298 K. The Pb(II) removal rate reaches 96% at 60 min and exceeds 99% at the equilibrium state in the pH range of 2.0–5.8. Hill and pseudo-second-order models can well describe the sorption process. Pb(II) adsorbing onto UiO-66-ATA(Zr) is an irreversible, favorable chemisorption process with multimolecule participation and film diffusion control. The calculations of density functional theory, the experimental results, and the characterization analyses suggest that the binding mechanisms are the chelation and ion-exchange/electrostatic interactions between hydroxyl/amino/sulfhydryl groups of UiO-66-ATA(Zr) and Pb(II). Besides, UiO-66-ATA(Zr) has a better affinity to Pb(II) than the coexisting ions in water and an excellent repeatability at eight cycles of adsorption. Moreover, the thermodynamic study shows that UiO-66-ATA(Zr) adsorbing Pb(II) is an endothermic reaction. Thus, UiO-66-ATA(Zr) is a prospective sorbent for Pb(II) removal under the initiative of environmental protection and water purification, and this work may also provide an idea for industrial catalysis.
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ACS Applied Energy Materials
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2020
·
IF 4.473
Ming Chen,TrungHieu Le,Yuanxiang Zhou,Feiyu Kang,Ying Yang
Developing advanced carbon nanomaterials with reasonable pore distribution and interconnection and matching the charge-storage capacities and electrode kinetics between the capacitive electrode and the battery-type electrode are two of the biggest challenges in lithium-ion capacitors (LICs). In this work, a sustainable strategy to fabricate N/S dual-doped hierarchical porous carbon nanofibers (N/S-CNF) is developed via electrospinning and thiourea treatment, and the N/S-CNF is employed as both the capacitor-type cathode and the battery-type anode for LICs. With rational design, N/S-CNF can not only offer a large specific surface area with a hierarchical pore structure but also be uniformly doped with heteroatoms, which is desirable for improving the electrochemical performance of both the cathode and the anode for LICs and alleviating the mismatch between the two electrodes. LICs assembled with the designed N/S-CNF electrodes can deliver a high energy density of 154 Wh kg–1 with a stable capacitance retention of 92% after 6000 cycles. Our work is expected to open up new avenues for developing heteroatom-doped porous carbon nanomaterials applied in other energy conversion and storage devices.
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JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Zifan Li,Zhibin Zhang,Zhimin Dong,Yongchuan Wu,Xiang Zhu,Zhongping Cheng,Yuhui Liu,Yingcai Wang,Zhijian Zheng,Xiaohong Cao,Youqun Wang,Yunhai Liu
The separation of uranium U(VI) through photoreduction approach has attracted substantial attention. Sulfide-based materials have revealed excellent performance for reducing U(VI) and there is no record of CuS based materials. Herein, we synthesized CuS/TNTAs heterostructured nanocomposites (CUTN) with varied CuS contents via successive ionic layer adsorption and reaction (SILAR) method. After SILAR deposition for 10 times, CUTN-10 showed the best photocatalytic performance, and 92.6 % of U(VI) can be removed within 180 min. The CuS could provide sufficient photoelectrons and TNTAs can transport these photoelectrons to the adsorbed U(VI) on its surface, the reduced uranium sediment was proved to be (UO 2 ) O 2 ·2H 2 O. More important, the combination of TNTAs could effective inhibit photocorrosion of CuS and the leaching of Cu 2+ was relatively low. We also unconsciously found that CUTN-10 can photoreduce U(VI) without any sacrificial agent which caused by the oxidation of S 2− . This work expands the application of sulfide-based materials and provides basic data for bracing the expansion of sulfide-based materials in the field of U(VI) photoreduction.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Wensha Niu,Zuoyi Xiao,Zhenyu Zhao,Shangru Zhai,Na Liu,Chengrong Qin
In this academic research, we report a facile carbonization approach to fabricate Ni 3 S 2 nanoparticles immobilized on interconnected carbon nanosheets (denoted as Ni/Ni 3 S 2 @CNS) derived from sodium alginate . The prepared hybrids provide more redox sites and shorten ion diffusion path. On the one hand, the interconnected carbon nanosheets restrain the agglomeration and dissolution of nanoparticles under the high carbonization temperature. On the other hand, it effectively improves the electrical conductivity , thus maintaining its excellent electrochemical properties . Consequently, the Ni/Ni 3 S 2 @CNS-2-800 electrode fulfills perfect specific capacity, satisfactory charge-discharge rate, and splendid lifespan. Furthermore, an advanced asymmetrical device is assembled by employing Ni/Ni 3 S 2 @CNS-2-800 and activated carbon as the electrode materials, which delivers a high specific capacitance (229.30 F g −1 ) and exceptional energy density (81.42 W h kg −1 ).
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