OPTIK
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2020
·
IF 2.187
Tongpeng Zhao,Shaohua Ji,Degao Zhong,Fei Teng,Shakir Ullah,Siyuan Hu,Jie Tang,Bing Teng
The organic nonlinear optical (NLO) material N, N-dimethyl-4-[2-(2-quinolyl) vinyl] aniline (DADMQ) has been synthesized and high-quality single crystal with the dimension of 8 × 1 × 0.5 mm 3 was grown from methanol solvent by slow cooling method for the first time. Single crystal and powder XRD studies show that DADMQ crystal belongs to the orthorhombic space group Pna2 1 . All the functional groups and structure of the synthetic material can be determined from FT-IR and 1 H NMR spectral analyses. The thermal properties can be studied through TG/DTG and DSC analyses, and its melting point is confirmed at 184.9 ℃. Some critical optical characteristics like the optical transmittance, optical absorption coefficient (α), energy band gap ( E g ), cut-off wavelength (λ max ) and extinction coefficient (κ) can be carried out through UV–vis-NIR spectral analysis. The dielectric features of the title crystal have also been measured. Furthermore, there is a blue emission appeared at 493 nm through PL spectral analysis. The second harmonic generation (SHG) efficiency of the title crystal has been measured, which indicates that DADMQ has 3.64 times greater than KDP crystal.
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高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Xinan Shi,Yuxiang Wang,Hui Yu,Gang Wang,Lijian Huang,Daocheng Pan
The crystal quality of a Cu2ZnSn(S,Se)4 (CZTSSe) thin film is crucially important to a high-performance CZTSSe solar cell. After selenization, a bilayer CZTSSe thin film consisting of a large-grain top layer and a small-particle bottom layer is usually observed according to the literature. In this work, a facile air-annealing pretreatment is conducted for a Cu2ZnSnS4 precursor thin film prior to selenization, which can lead to sodium diffusion into the CZTS precursor thin film and surface oxidization of the CZTS thin film. Our experimental results revealed that the Na prediffusion and the surface oxidation of the CZTS precursor thin film can significantly promote the crystal growth of the CZTSSe thin film, which can completely remove the small-particle bottom layer and form a large-grain-spanned CZTSSe thin film. As a result, a photoelectric conversion efficiency of 9.80% was achieved by this method.
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高影响因子
ACS Sensors
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2020
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IF 7.333
Xiao-Bin Huang,Shao-Hua Wu,Hao-Cheng Hu,Jian-Jun Sun
The “turn-on” mode surface-enhanced Raman scattering (SERS) aptasensor for ultrasensitive ochratoxin A (OTA) detection was developed based on the SERS “hot spots” of AuNanostar@4-MBA@Au core–shell nanostructures (AuNS@4-MBA@Au) and exonuclease III (Exo III)-assisted target cycle amplification strategy. Compared with conventional gold nanoparticles, AuNS@4-MBA@Au provides a much higher SERS enhancement factor because AuNS exhibits a larger surface roughness and the lightning rod effect, as well as an excellent electromagnetic field between the AuNS core and the Au shell, which contribute to the superstrong SERS signal. Meanwhile, Exo III-assisted target cycle amplification can be used as an effective method for the further amplified detection of OTA. Additionally, the utilization of streptavidin magnesphere paramagnetic particles offers a green, economical, and facile technology for the accumulation and separation of the signal probe AuNS@4-MBA@Au from solution. All these factors lead to a significant enhancement of detectable signals and superhigh sensitivity. As a result, the limit of detection as low as 0.25 fg mL–1 could be achieved, which was lower than that in the other reported literatures on SERS methods for OTA detection as we know. The developed SERS aptasensor also provides a promising tool for foodstuff detection.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Xiao Wang,Guangkuo Si,Yanru Kou,Meng Ding,Shouwei Zhang,Jinzhao Huang,Xijin Xu
Fabricating catalysts with dual active sites is an effective approach for boosting the catalytic activities. In this work, a highly active catalyst with Co nanoparticles decorating on interconnected N-doped carbon nanotube clusters (Co@NCNTS) was synthesized by directly heating the ZIF-67 precursor in H 2 /Ar atmosphere. The Co nanoparticles exhibited small particle sizes (7–11 nm) and high dispersions, which will prevent the particles from coalescence and agglomeration. In addition, the intertwined NCNTS network could also provide a long-term conductivity, which will facilitate the transfer of charge carriers and effectively enhance the catalytic performance. After that, the catalytic reduction performance of the catalysts to 4-nitrophenol in the presence of NaBH 4 solution was also investigated. As expected, the as-synthesized Co@NCNTS catalyst exhibited a superior catalytic reduction ability to 4-nitrophenol in the presence of NaBH 4 solution with an almost 100% conversion ratio and a high apparent kinetic rate constant k of 0.37 min −1 . Furthermore, the pristine NCNTS also exhibited well catalytic reduction performance to 4-nitrophenol with a k constant of 0.09. The synergetic effect between Co nanoparticles and NCNTS could effectively boost the catalytic reduction performance. Thus, the excellent catalytic performance could own to the confinement effect of ZIF-67 precursors, high conductivity and synergetic effect between Co nanoparticles and NCNTS.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
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IF 2.369
Guoquan Zhou,Ke Chen,Zehui Yang,Danfeng Shao,Huajun Fan
The present study investigating the experimental equilibrium solubility of 2-chloro-4-amino-6,7-dimethoxyquinazoline (CADQ) dissolved in 12 kinds of neat organic solvents, including methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutyl alcohol, ethyl acetate, toluene, N,N-dimethyl formamide (DMF), N-methylpyrrolidone (NMP), 1,4-dioxane, and cyclohexanone, was determined in an equilibrium state by means of the isothermal saturation method at temperature ranges of 273.15–313.15 K under normal atmospheric conditions of 101.2 kPa. The rising temperature showed the obvious positive effect on the increasing CADQ solubility gradually, and the maximum value (0.01370 at 313.15 K, in mole fraction) was observed in NMP for the studied temperature ranges. The equilibrated solid state of CADQ was characterized by applying the Fourier transform infrared (FT-IR) spectrometer, resulting in no existences of crystal transition, solvate formation, or polymorphic transformation in the experimental process. Results showed that the mole fraction solubility of CADQ abiding the order from high to low is as follows: NMP (0.01370, 313.15 K) > DMF (0.01157, 313.15 K) > cyclohexanone (3.847 × 10–3, 313.15 K) > ethyl acetate (1.010 × 10–3, 313.15 K) > n-butanol (9.288 × 10–4, 313.15 K) > isobutyl alcohol (8.408 × 10–4, 313.15 K) > n-propanol (7.692 × 10–4, 313.15 K) > ethanol (6.934 × 10–4, 313.15 K) > isopropanol (6.220 × 10–4, 313.15 K) > methanol (5.437 × 10–4, 313.15 K) > 1,4-dioxane (2.535 × 10–4, 313.15 K) > toluene (2.174 × 10–5, 313.15 K). Then, the achieved CADQ solubility values were correlated and calculated by mathematical models containing the modified Apelblat equation and λh equation, respectively. As a consequence, the largest root-mean-square deviation (RMSD) and average relative deviation (ARD) were 1.020 × 10–4 and 2.352%, respectively, which turned out to be that the calculated data agreed well with the experimental ones.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
lili Liu,Yuanliang Huang,Yang Xiong,Quanli Zhang,Junxiao Yang,Yawen Huang
One of the main drawbacks of porous coordination polymers is their low stability and nonrecyclability in acidic or alkaline environments. Herein, we proposed a “coordination-copolymerization” strategy and successfully introduced covalent crosslinked skeleton into a coordination skeleton via copolymerization of di(4-vinylpyridine) zinc chloride and divinylbenzene, thus producing a polymer having a hybridized skeleton (poly(ZnVP 2 -co-DVB)). This polymer exhibits a porous structure and fluorescence and colorimetric sensing abilities toward Cu 2+ ions. More importantly, poly(ZnVP 2 -co-DVB) exhibits high skeleton stability in acidic and alkaline environments. By reintroducing zinc ions, the chemical properties, porous structure, and the sensing ability are regenerated after being destroyed in an acidic or alkaline environment, thus demonstrating its recyclability.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Linlin Ma,Chenyang Zhou,Haoyue Zhang,Yan Sun,Beibei Wang,Xia Feng,Ya Chu,Zibo Wu,Chao Wang,Guangjiu Zhao
In this work, we report a family of co-halogenated two-dimensional hybrid perovskites (2DHPs) based on phenethylammonium lead halogen ((PEA) 2 Pb(Cl/Br) 4 ) in which the organic cation-site (PEA) is substituted with halogen at the para-site, namely the formation of 4-halophenethylamine (X-p-PEA) (X = Cl, Br; p: para-site). The organic cations are regulated by introducing halogen ions at the para-site of the benzene ring to promote the structural distortion of the lead halide octahedral inorganic layer. Furthermore, (X-p-PEA) causes a shift in the energy band distribution of 2DHPs. In this case, the photoluminescence competition of free excitons (FEs) and self-trapped excitons (STEs) changes the microscopic relaxation process of excitons. In addition, we found that (Br-p-PEA) can increase the photoluminescence quantum yield (PLQY). At the same time, we regulate the halogen-site of perovskites from lead-chloride perovskites (LCPs) to lead bromine perovskites (LBPs), achieving emission from white light to blue light. Therefore, the co-halogenation regulation strategy of organic cation-site and halogen-site can effectively regulate the photoluminescence wavelength and improve the PLQY. This is of great significance for the development of perovskite materials with specific optoelectronic applications.
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高影响因子
BRAIN BEHAVIOR AND IMMUNITY
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2020
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IF 6.633
Jinfeng Xie,Bingtian Bi,Yunyun Qin,Wenli Dong,Jiahong Zhong,Mengfan Li,Yufang Cheng,Jiangping Xu,Haitao Wang
Inhibition of phosphodiesterase-4 (PDE4) produces robust anti-inflammatory and antidepressant-like effects in multiple animal models. However, the detailed mechanisms have not been well studied. Receptor for advanced glycation endproducts (RAGE) and inflammasome activation are implicated in the etiology of depression. Here, we aimed to investigate the involvement of RAGE and nucleotide-binding domain (NOD)–like receptor protein 3 (NLRP3) inflammasome in the antidepressant-like effects of PDE4 inhibition in mice. We found that inhibition of PDE4 by roflupram (ROF, 0.5, and 1.0 mg/kg, i.g. ) exerted antidepressant-like effects in mice subjected to chronic unpredictable mild stress (CUMS). Simultaneously, ROF inhibited CUMS-induced microglial activation and restored the morphology of microglial cells in the hippocampus, as evidenced by reduced total process length, area, volume, number of branching points, number of terminal points and total sholl intersections of microglia. ROF also decreased the expression of ionized calcium-binding adapter molecule-1 and the level of interleukin-1β. Western blot analysis showed that PDE4 inhibition suppressed the high-mobility group box 1 protein (HMGB1)/RAGE signaling pathway, as the levels of HMGB1, RAGE, toll-like receptor 4, phosphorylated p38 mitogen-activated protein kinase, and nuclear factor κ-B were decreased in both hippocampus and cortex in mice after treatment with ROF. Moreover, ROF also attenuated the protein levels of NLRP3, the apoptosis-associated speck-like protein containing (ASC), and cysteine-requiring aspartate protease-1 (Caspase-1), which are key proteins in the NLRP3-mediated inflammasome signaling pathway. In summary, these results demonstrate that the down-regulation of HMGB1/RAGE signaling pathway and inflammasome suppression possibly contribute to the antidepressant-like effects of PDE4 inhibitors. And, ROF has potential as a candidate drug in the treatment of depression.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 29
·14137-14152
·
IF 3.553
Ji Jingqi,Zhao Jianqing,Ke Yangchuan
Abstract There has been growing interest in using nanomaterials to improve the comprehensive properties of polymer microspheres as plugging agents in the oil industry. Chemically functionalized graphene was prepared via water-phase direct exfoliation by cell fragmentation. The resultant graphene nanosheets were used to fabricate poly(acrylamide-acrylic acid-4-acryloylmorpholine)-based nanocomposite microspheres via in situ emulsion polymerization. Microspheres containing 0.3 wt% graphene (Graphene 0.3/terpolymer) showed high water retention and heat and shear resistance. Moreover, these microspheres exhibited improved nanomechanical properties, implying high dispersity and flowability in aqueous media. A rheology test demonstrated that the suspension of Graphene 0.3/terpolymer behaved as a Newtonian fluid under high shear conditions, which indicated an improvement in the migration ability in the plugging process. The substantially improved comprehensive properties ensured a deep profile control and enhanced oil recovery of Graphene 0.3/terpolymer microspheres. This research revealed that graphene can serve as a promising filler for fabricating high-performance microspheres in industry. Graphic abstract
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xiaogong Lv,Chengjun Zhu,Huimin Hao,Ruijian Liu,Yiming Wang,Junzhen Wang
In this work, Cu 2 ZnSn 1- x Ge x S 4 (CZTGS) precursor thin films with varied Ge composition ( x = 0, 0.2, 0.4, 0.6, 0.8, and 1) were prepared by using a water-based solution approach. After selenizing at 550 °C for 10 min in a graphite box containing selenium powder, the as-fabricated kesterite Cu 2 ZnSn 1- x Ge x (S,Se) 4 (CZTGSSe) thin films were systematically investigated for phase structure, morphology, valence states of elements, optical properties , and electrical properties. The results showed that the Ge element was successfully incorporated into the host lattice of Cu 2 ZnSn(S,Se) 4 (CZTSSe), and kesterite CZTGSSe films were formed. As the Ge content increased, the crystal grains in the films grew larger and showed uniform morphology on the sample surfaces. The band gap in the CZTGS(Se) thin films could be engineered in the range of 1.21 eV–2.00 eV by tuning the relative compositions of the Ge elements. Furthermore, it was confirmed that the doping of Ge improved the mobility, resistivity, and photoelectric performance of the films. Finally, the Cu 2 ZnSn 0.8 Ge 0.2 (S,Se) 4 solar cell device with an efficiency of 5.39% was prepared. The results indicate that non-toxic water solution-based CZTGSSe films showed potential for application in solar cells.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 30
·17167-17177
·
IF 4.22
Gan Xiaoyan,Zhao Wenhui,Xu Tianye,Liang Yun,Guo Liling,Liu Hanxing
Two-dimensional (2D) organic–inorganic perovskite hybrid materials with enhanced stability have attracted wide attention in optoelectronic field in recent years. Efforts of exploring new 2D perovskites with various organic or inorganic components have been devoted to further improve their solar cell efficiencies. In this work, three structurally similar spacer cations of phenylethylammonium (PEA), 4-bromophenylethylammonium (BPEA) and 4-chlorophenylethylammonium (CPEA) are selected to prepare multilayered 2D perovskites. It is found that the introduction of halogen atoms in the organic cations positively influences the film quality, light absorption, charge transport, device performance and moisture stability of the resulting perovskites. The (BPEA) 2 (MA) 4 Pb 5 I 16 and (CPEA) 2 (MA) 4 Pb 5 I 16 perovskites exhibit efficiencies of 7.38% and 10.88%, respectively, which are much higher than that of (PEA) 2 (MA) 4 Pb 5 I 16 (3.98%). Owning to the larger size and bigger electronegativity of halogen atom in spacer cations, the PCE of unsealed BPEA- and CPEA-based 2D perovskite devices maintains 73% and 63% of their original efficiency after 720 h exposure to 60% humid air, while the PEA-based 2D device decreases to 52% of its initial PCE. Our work demonstrates new insight to modify the quality and stability of 2D perovskite hybrids, highlighting the validity of molecule design of organic cations in improving the efficiency and stability of 2D perovskite solar cells.
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高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 22
·4903-4913
·
IF 6.569
Yufeng Yao,Jiayi Yuan,Ming Shen,Bin Du
In this study, hexylresorcinol calix[4]arene-ZnO-Au (HRCA-ZnO-Au) micro–nano materials are synthesized by a simple atmospheric reflux. AuCl4− ions are in situ reduced to Au by the phenolic hydroxyl groups of amphiphilic HRCA and deposited on the primarily formed ZnO sheets, which prevents Zn2+ ions in the solution from depositing at this position. Finally, the flake sample is obtained. HRCA and chloroauric acid effectively shape the morphology of ZnO from micron-sized flowers to nanometer sheets, and they significantly increase the specific surface area of the sample. Low temperature calcination of the HRCA-ZnO-Au composite micro–nano materials partially removes calixarene molecules and exposes the surface of ZnO–Au. Thus, the photocatalytic activity of ZnO–Au is significantly improved due to the synergistic effect between ZnO and Au.
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