Nanomanufacturing and Metrology
·
2024
·Vol. 7
·期 1
·1-16
·
IF 0
Wang Tao,Tian Yanling,Lu Zhilai,Wang Weijie,Zhang Zhao,Zhu Guangwei,Tang Hui,Zhang Dawei
As a promising micro/nanofabrication method, electrical-assisted nanomachining has obtained substantial attention due to its high material removal rate and attainable superior surface quality. In this study, a rectangular wave electrical signal was applied for nanomachining by a customized tungsten tip. Owing to the coupling effect between the electric field and mechanical force, the cutting depth of the machined grooves can be expanded. In electrical-assisted groove processing, a depth of 270 nm and an aspect ratio of 0.6 on the copper sample can be achieved. The influence of operation parameters including applied voltage, frequency, duty ratio, normal force and cutting speed on the machining performance was investigated in terms of the groove depth, width, aspect ratio, and surface roughness. The potential machining mechanisms should be a combination of electric field force, nanoscale electric discharge, electric contact thermal effects, possible annealing behavior, and scraping and plowing actions induced by mechanical forces.
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RARE METALS
·
2024
·Vol. 43
·期 5
·1999-2014
·
IF 9.6
Li Mei,Wang Jing-Zhi,Jin Zhi-Liang
In the process of photocatalytic water cracking, the migration rate and utilization rate of photogenerated charges determine the hydrogen evolution performance of the catalyst. In this paper, a carbon isotope superconducting material graphdiyne (GDY) is prepared by mechanical ball milling and introduced into the S-scheme heterojunction Zn 0.5 Co 0.5 S/MoS 2 inorganic system. In terms of hydrogen evolution kinetics, GDY acts as an electron bridge, not only accelerating the migration of photogenerated carriers but also improving the utilization of photogenerated charges. Morphologically, the large two-dimensional layer provides more loading and anchoring points for Zn 0.5 Co 0.5 S/MoS 2 , which increases the number of active sites. The ternary composite catalyst 20%GDY/Zn 0.5 Co 0.5 S/Mo 2 S (20-GCSM) generates 69.94 μmol of hydrogen (5 h) in triethanolamine solution. It is 2.97 and 1.80 times higher than Zn 0.5 Co 0.5 S and Zn 0.5 Co 0.5 S/MoS 2 , respectively. After the cyclic experiment, it still has stable hydrogen evolution performance after standing for 24 h (under dark conditions). In addition, the potential mechanism of photocatalytic hydrogen evolution is demonstrated through in-situ X-ray photoelectron spectroscopy. This work provides a reference for further research in the field of introducing carbon materials into photocatalytic systems and improving the utilization of photogenerated charges. Graphical abstract
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高影响因子
Biomass Conversion and Biorefinery
·
2022
·Vol. 13
·期 15
·13771-13783
·
IF 4.05
Li Xiaohua,Liu Tieyi,Shao Shanshan,Yan Jinlong,Zhang Hongchang,Cai Yixi
The catalytic transfer hydrogenation of biomass-derived furfural, butyraldehyde, and acetone was carried out over an inexpensive copper-based hydrotalcite-like catalyst using methanol as both hydrogen donor and solvent. X-ray photoelectron spectroscopy (XPS) characterization was conducted to analyze copper valence state on the catalyst. The bivalent copper ion was reduced to monovalent and zero valent copper during the reaction. The transfer hydrogenation of furfural, butyraldehyde, and acetone was obviously promoted at higher temperature and longer duration. With regard to hydroprocessing, the yield of corresponding alcohol was greatly increased to 95.69 mol% (furfuryl alcohol), 97 mol% (butanol and methyl butanol), and 82.17 mol% (isopropanol) at 200 ℃ for 2.5 h, respectively, which indicated the superior catalytic transfer hydrogenation activity of copper-based catalyst. The reactions of different reactant were compared in this study. The highest yields of three target products were obtained at same time, which was mainly ascribed to the reduction rate of copper species. This study put forward a green, efficient hydrogenation reaction of biomass-derived oxygenated chemicals using an inexpensive copper-based catalyst and methanol system without any external hydrogen supply.
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高影响因子
CHEMISTRY OF NATURAL COMPOUNDS
·
2025
·
IF 0.9
Wang Yong,Wang Wei,Liu Li-Na,Wei Dong-Lin,Liu Cong-Jun,Wei Shang-Hua,Gao Song,Yu Shu-Ping,Yao Ning,Wang Yu-Fei
A series of abietic acid derivatives modified with a triazole moiety at the C-18 position were synthesized using Huisgen 1,3-dipolar cycloaddition reaction of 18-azidoabietane with alkynes. The antitumor activity of the synthesized compounds was investigated through human cervical cancer cells (HeLa), human breast cancer cells (MCF-7) and human renal epithelial cells (HEK-293T). The outcome indicated that compounds 5e , 5f , 5j exhibited positive inhibitory activity against the tested tumor cell lines. In particular, the IC 50 value for the inhibitory activity of compound 5e against human breast cancer cells (MCF-7) was 11.2 μmol/L.
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高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-6
·
IF 3.159
Shan Dan,Tong Guoqing,Cao Yunqing,Tang Mingjun,Xu Jun,Yu Linwei,Chen Kunji
Hybrid organic-inorganic perovskites (HOIPs) exhibit long electronic carrier diffusion length, high optical absorption coefficient, and impressive photovoltaic device performance. At the core of any optoelectronic device lie the charge transport properties, especially the microscopic mechanism of scattering, which must efficiently affect the device function. In this work, CH 3 NH 3 PbI 3 (MAPbI 3 ) films were fabricated by a vapor solution reaction method. Temperature-dependent Hall measurements were introduced to investigate the scattering mechanism in MAPbI 3 films. Two kinds of temperature-mobility behaviors were identified in different thermal treatment MAPbI 3 films, indicating different scattering mechanisms during the charge transport process in films. We found that the scattering mechanisms in MAPbI 3 films were mainly influenced by the decomposed PbI 2 components, which could be easily generated at the perovskite grain boundaries (GBs) by releasing the organic species after annealing at a proper temperature. The passivation effects of PbI 2 in MAPbI 3 films were investigated and further discussed with emphasis on the scattering mechanism in the charge transport process.
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高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-11
·
IF 3.159
Lu Lu,Li Sheng,Li Jun,Lan Lifang,Lu Yan,Xu Shuaijun,Huang Si,Pan Chunyang,Zhao Fenghua
The FeF 3 ·0.33H 2 O cathode material can exhibit a high capacity and high energy density through transfer of multiple electrons in the conversion reaction and has attracted great attention from researchers. However, the low conductivity of FeF 3 ·0.33H 2 O greatly restricts its application. Generally, carbon nanotubes (CNTs) and graphene can be used as conductive networks to improve the conductivities of active materials. In this work, the FeF 3 ·0.33H 2 O cathode material was synthesized via a liquid-phase method, and the FeF 3 ·0.33H 2 O/CNT + graphene nanocomposite was successfully fabricated by introduction of CNTs and graphene conductive networks. The electrochemical results illustrate that FeF 3 ·0.33H 2 O/CNT + graphene nanocomposite delivers a high discharge capacity of 234.2 mAh g −1 in the voltage range of 1.8–4.5 V (vs. Li + /Li) at 0.1 C rate, exhibits a prominent cycling performance (193.1 mAh g −1 after 50 cycles at 0.2 C rate), and rate capability (140.4 mAh g −1 at 5 C rate). Therefore, the electronic conductivity and electrochemical performance of the FeF 3 ·0.33H 2 O cathode material modified with CNTs and graphene composite conductive network can be effectively improved.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2011
·Vol. 13
·期 12
·6661-6672
·
IF 3.253
Zhou Qiang,Fu Ming-Lai,Yuan Bao-Ling,Cui Hao-Jie,Shi Jian-Wen
The semiconductor quantum dots (QDs) can be very efficient to tune the response of photocatalyst of TiO 2 to visible light. In this study, CdS QDs formed in situ with about 8 nm have been successfully deposited onto the surfaces of TiO 2 nanotubes (TNTs) to form TNTs/CdS QDs nanocomposites by use of a simple bifunctional organic linker, thiolactic acid. The diffuse reflectance spectroscopy (DRS) spectra of as prepared samples showed that the absorption edge of the TNTs/CdS composite is extended to visible range, with absorption edge at 530 nm. The photocatalytic activity and stability of TNTs/CdS were also evaluated for the photodegradation of rhodamine B. The results showed that when TNTs/CdS QDs was used, photocatalytic degradation of RhB under visible light irradiation reached 91.6%, higher than 45.4 and 30.5% for P25 and TNTs, respectively. This study indicated that the TNTs/CdS QDs nanocomposites were superior catalysts for photodegradation under visible light irradiation compared with TNTs and P25 samples, which may find wide application as a powerful photocatalyst in environmental field.
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高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 184
·期 2
·483-489
·
IF 4.831
Wang Junjie,Wang Yu,Cui Min,Xu Shenghao,Luo Xiliang
An electrochemical sensor for H 2 O 2 was developed based on electrochemically deposited Prussian blue (PB) nanoparticles doped poly(3,4-ethylenedioxythiophene) (PEDOT). The PEDOT/PB composite was composed of PEDOT wrapped PB nanoparticles, where the conducting polymer PEDOT not only protected the PB particles to warrant high stability, but also connected them to enhance the electron transfer. Owing to the excellent conductivity of PEDOT and unique electrocatalytic activity of PB, the PEDOT/PB modified electrode exhibited good catalytic activity toward the electrochemical reduction of H 2 O 2 , and was used for the detection of H 2 O 2 in concentrations ranging from 0.5 to 839 μM, with a detection limit of 0.16 μM. Moreover, the sensor also demonstrated excellent reproducibility, selectivity and long-term stability, showing great promise for the fabrication of electrochemical sensors and H 2 O 2 related biosensors.
An electrochemical non-enzymatic sensor for hydrogen peroxide with excellent stability was developed. It is based on conducting polymer PEDOT doped with Prussian blue nanoparticles.
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高影响因子
Journal of the Iranian Chemical Society
·
2015
·Vol. 12
·期 12
·2149-2159
·
IF 1.087
Wu Kai-Fei,Jiang Fen,Bai Xian-Li,Mo Shao-Yin,Qin Gui-Fang,Feng Yu
The reactions of a semirigid carboxylic ligand 5-(Pyridin-3-yl)isophthalic acid(H 2 pyip) with Mn(CH 3 COO) 2 /Zn(NO 3 ) 2 /Pb(NO 3 ) 2 afforded three new complexes: [Mn(pyip)(H 2 O) 2 ] n ( 1 ), [Zn(pyip)(H 2 O) 2 ] n ( 2 ), and [Pb(pyip)] n ( 3 ). Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analyses. X-ray structure analysis reveals that complexes 1-2 showed identical 3D supramolecular architecture that just connect different metal centers. They all crystallize in hexagonal space group P6(5) and exhibit the same coordination mode. One of the H 2 pyip adopts bidentate chelate coordination mode, and the other coordinate carboxylate oxygen atom adopts the single dentate-bridging mode. Complex 3 adopts different coordination modes crystallized in monoclinic space group P2(1)/c compared to 1-2, combined bidentate chelate and chelating–bridging tetradentate coordination modes. A noticeable point in this paper is that compounds 1-3 exhibit preferable catalytic properties on degradation of Rhodamine B (RhB). Moreover, the luminescent properties were investigated.
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高影响因子
JOURNAL OF POROUS MATERIALS
·
2015
·Vol. 23
·期 2
·301-310
·
IF 1.108
Ye Wei,Zhao Binxia,Gao Han,Huang Jiajun,Zhang Xiaoli
Fe,Zn,Al-pillared montmorillonite (Mt) were prepared by ion exchange reaction. Effect of the Fe/Zn molar ratio in Fe,Zn,Al-pillaring solution on the structural properties of Fe,Zn,Al-Mt was examined. Characterization studies were performed by N 2 -adsorption/desorption, ICP, FTIR, DR UV–Vis spectroscopy and XRD. The interlayer space, specific surface and volume of micropores of pillared-Mt was 18.8 Å, 157 m 2 g −1 and 0.114 cm 3 g −1 respectively. Besides, the catalytic performance of Fe,Zn,Al-Mt was analyzed through wet peroxide oxidation of Orange II under mild experimental condition. The results indicated that the catalytic performance of Fe,Zn,Al-Mt was affected by the Fe/Zn molar ratio as following pattern: the obtained pillared solids with lower Fe/Zn molar ratios exhibited better catalytic performance and less iron leaching during the reaction. Moreover, the introduction of zinc into Mt shortened the induction time of reaction and improved the catalytic behaviour. Throughout this work, the chemical oxygen demand removal of OII was 77.1 % after the solution treated by Fe,Zn,Al(3/7)-Mt (defined as the Fe/Zn molar ratio of 3/7 in the pillaring solution) catalyst at temperature of 60 °C and atmospheric pressure of 1 atm.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 48
·期 11
·7068-7075
·
IF 1.676
Li Shuhui,Zhou Ying,Cui Lijun,Ge Zhenhua,Feng Jing
In 2 O 3 (ZnO) k superlattice ceramics are promising oxide thermoelectric materials, as superlattice interfaces are effective in scattering phonons and filtering low-energy electrons to decrease thermal conductivity and improve the figure of merit ( ZT ) value. In this work, homologous compounds were prepared by solid-state reaction method using ZnO and In 2 O 3 as raw materials. Phase purity and crystal structure were characterized by x-ray diffraction, revealing that In 2 O 3 (ZnO) k crystallizes in an R3 m space group for odd k values and P6 3 /mmc for even k values. The study of thermoelectric (TE) properties showed that as k increased, the thickness of InO(ZnO)
+ 3
also increased, while the electrical conductivity, thermal conductivity, Seebeck coefficient, power factor and ZT value were all decreased. In 2 O 3 (ZnO) 3 samples obtained a maximum power factor of 651 μ W m −1 K −2 at 973 K, and also achieved a maximum ZT value of 0.24 at 973 K.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2013
·Vol. 17
·期 10
·2595-2602
·
IF 2.279
Wang Li,Qi Wei,Su Rongxin,He Zhimin
A novel electrochemical platform based on ZnS-doped graphene (GR-ZnS) nanocomposites was developed to achieve the direct electron transfer between hemoglobin (Hb) and the modified electrode. GR-ZnS nanocomposites were synthesized via noncovalent functionalization of pristine graphene (GR) by 1-aminopyrene and subsequent in situ synthesis of ZnS nanoparticles on the GR surface. During this process, the intrinsic electronic properties of GR could be efficiently protected. The as-prepared GR-ZnS nanocomposites were characterized and identified by means of transmission electron microscopy and energy dispersive X-ray spectrometer analysis, indicating the uniform formation of ZnS nanoparticles on the surface of GR. Fourier transform infrared spectra spectroscopic results confirmed that Hb remained its native structure in the nanocomposite material. The GR-ZnS nanocomposites could efficiently promote the direct electron transfer between Hb and electrode with the electron transfer rate constant ( k
s ) of 3.42 s −1 . The modified electrode was then used for the determination of H 2 O 2 based on the electrocatalytic activity of Hb towards H 2 O 2 , which exhibited a linear range from 10 to 250 μM with a detection limit of 1.12 μM. The proposed method to fabricate GR-based hybrid nanomaterials would have a great potential for applications in various fields such as electrochemical sensing, catalytic reaction, and super capacitors.
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高影响因子
危险品化学品经营许可证（带存储）