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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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 29
·14137-14152
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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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OPTIK
·
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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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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ACS Sensors
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2020
·
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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EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Qingqing Ye,Baozhong Zhang,Yanhua Yang,Xiaoyu Hu,Yingzhong Shen
Two different aromatic diamines monomers (3, 5-diamino-N-(4'-phenyl-4''-triphenylamino)-N-(4''-benzyl-4'''-triphenylamino)benzamide (DPTBTB) and 3, 5-diamino-N-(4'-3'', 4'', 5''-trifluorobiphenyl)-N-(4''-benzyl-3''', 4''', 5'''-trifluorophenyl)benzamide (DTBTB)) containing flexible linkages were designed and synthesized, respectively. Four organo-solubility polyimides (PI-a, PI-b, PI-c, and PI-d) were prepared via a two-step procedure with pyromellitic dianhydride (PMDA) and 3, 3', 4, 4'-biphenyltetracarboxylic dianhydride (BPDA), respectively. The four PIs performed excellent thermal stability with the temperature of 5% weight loss in range of 370–420 ℃ at N 2 atmosphere. The Al/PI-a/ITO and Al/PI-b/ITO memory devices exhibited binary write-once-many-read (WORM) and rewritable (Flash) behavior, respectively. But the Al/PI-c/ITO and Al/PI-d/ITO memory devices showed ternary WORM and Flash behavior due to the deeper charge traps came from the fluorinated groups in the structure of PI-c and PI-d, respectively. The memory switching mechanism could be demonstrated through molecular simulation. The results gave an effective strategy that adjusting the structure of PI to achieve different memory effects.
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Frontiers of Environmental Science & Engineering
·
2019
·Vol. 14
·期 1
·1-10
·
IF 3.883
Wang Jian,Wang Qun,Gao Xueli,Tian Xinxia,Wei Yangyang,Cao Zhen,Guo Chungang,Zhang Huifeng,Ma Zhun,Zhang Yushan
Mesoporous silica nanoparticles (MSN), with higher water permeability than NaA zeolite, were used to fabricate thin-film nanocomposite (TFN) reverse osmosis (RO) membranes. However, only aminoalkyl-modified MSN and low-pressure (less than 2.1 MPa) RO membrane were investigated. In this study, aminophenyl-modified MSN (AMSN) were synthesized and used to fabricate high-pressure (5.52 MPa) RO membranes. With the increasing of AMSN dosage, the crosslinking degree of the aromatic polyamide decreased, while the hydrophilicity of the membranes increased. The membrane morphology was maintained to show a ridge-and-valley structure, with only a slight increase in membrane surface roughness. At the optimum conditions (AMSN dosage of 0.25 g/L), when compared with the pure polyamide RO membrane, the water flux of the TFN RO membrane (55.67 L/m 2 /h) was increased by about 21.6%, while NaCl rejection (98.97%) was slightly decreased by only 0.29%. However, the water flux of the membranes was much lower than expected. We considered that the enhancement of RO membrane permeability is attributed to the reduction of the effective thickness of the PA layer.
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CARBON
·
2019
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IF 7.466
Shakiaz Ahmad,Chao Yang,Wenyu Xie,Zhibo Deng,Heng Zhang,Yunlong Zhao,Xintai Su
The integration of two transition metals with carbon materials provides a great potential to boost the catalytic and electrochemical properties of supercapacitor . However, a scalable fabrication of such composite materials remains a challenge. Here, ternary composites of NiS–NiCo 2 O 4 @C nanosheets were derived from nickel and cobalt oleate using Na 2 SO 4 as both hard template and sulfur source. The NiS–NiCo 2 O 4 @C composites were then tested as catalysts toward rapid reduction of 4-nitrophenol (4-NP) and as electrode materials for supercapacitors. It was found that the catalytic and electrochemical properties of the composites were tuned by adjusting the ratios of Co to Ni and annealing temperature. The optimized composite showed the highest reduction rate constant for 4-NP reduction (1.78 min −1 ). In addition, this composite has also shown high specific capacitance of 1411 F g −1 at 1 A g −1 and 99.5% capacity retention after 2000 continuous charge-discharge cycles at a current density of 3 A g −1 , which is much higher than their respective monometallic Co and Ni composites. Furthermore, the ASC device (CN14//AC) achieved a high energy density of 37.2 W h kg −1 at a power density of 799.9 W kg −1 , and a good cycling performance of retention(89%) after 5000 cycles.
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JOURNAL OF SEPARATION SCIENCE
·
2019
·Vol. 43
·期 2
·398-405
·
IF 2.516
Xiaojing Lai,Jing Liu,Xin Xu,Jie Li,Baojun Zhang,Lijun Wei,Hongping Cai,Xianglei Cheng
In reversed-phase liquid chromatography, tetracycline antibiotics yield broad and asymmetrical peaks, as a result of their ionic interaction with the anionic free silanol groups and metal ion present in the silica-based stationary phases (commonly derivatized with C18 groups). These frequently encountered difficulties were absolutely eliminated based on dual effect when methanesulfonic acid was employed as an eluent additive. The study revealed that the performance of methanesulfonic acid to minimize the “silanol effect” is mainly explained by both direct neutralization of the anionic silanol sites and electrostatic attraction with analytes. Based on these dual action mechanisms, an ultrasensitive method has been successfully developed for the simultaneous determination of tetracycline antibiotics and their derivatives (minocycline, oxytetracycline, tetracycline, chlortetracycline, metacycline, doxycycline, 4-epitetracycline, and 4-epichlortetracycline) in bovine milk with convenient ultraviolet detection within 15 min. Under the optimal conditions, the calibration curves showed good linearity ( r 2 > 0.999) for all analytes in the range of 1∼200 ng/mL with the instrument limits of detection as low as 0.3 ng/mL. The study sheds new light on suitable additives to analyze basic compounds with the advantage of good compatibility with MS detection.
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RSC Advances
·
2019
·Vol. 9
·期 54
·31440-31446
·
IF 3.049
Nannan Dou,Siyu Zhang,Jianying Qu
In this paper, Ag–Pd bimetallic nanoparticles uniformly distributed on reduced graphene oxide (rGO) were synthesized by redox reaction between Pd2+, Ag+and GO, and were characterized by X-ray diffractometry, field emission scanning electron microscopy, electrochemical impedance spectroscopy and thermal gravimetric analyses. A novel electrochemical sensor was constructed based on these nanocomposites using glassy carbon as a substrate. Under optimal conditions, the linear ranges were 0.50–300.00 μM for PA and 1.00–300.00 μM for 4-AP, with the detection limits of 0.23 μM for PA and 0.013 μM for 4-AP, respectively. This sensor was successfully applied to the determination of PA in pharmaceutical formulations and gave satisfactory results with a lower detection limit, wider linear range and good reproducibility.
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EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
·
2012
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IF 3.346
Lianbao Ye,Yuanxin Tian,Zhonghuang Li,Hong Jin,Zhengguang Zhu,Shanhe Wan,Junyan Zhang,Pengjiu Yu,Jiajie Zhang,Shuguang Wu
Deregulation of receptor tyrosine kinase c-Met has been reported in human cancers and is considered as an attractive target for small molecule drug discovery . In this study, a series of spiro[indoline-3, 4′-piperidine]-2-ones were designed, synthesized and evaluated as novel c-Met inhibitors. The results showed that the majority of the compounds exhibited significant inhibitory effect on c-Met with IC 50 values of 0.0147–17 μM in TR-FRET-based assay and IC 50 values of 1.56–1400 μM in cell-based assay. Furthermore, our docking experiments verified the results and explained the molecular mechanism of eminent activities to c-Met.
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EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
·
2014
·
IF 3.432
Jing Wu,Linxi Yu,Feifei Yang,Jingjie Li,Peng Wang,Wenbo Zhou,Liwen Qin,Yunqi Li,Jian Luo,Zhengfang Yi,Mingyao Liu,Yihua Chen
A series of 2,3-diaryl-4-thiazolidinone derivatives were synthesized and evaluated for their antiproliferative properties against two well-known cancer cell lines (A549 as human lung cancer and MDA-MB-231 as human breast cancer). Structure activity relationship (SAR) analysis resulted in the discovery of 2-(3-(arylalkyl amino carbonyl)phenyl)-3-(2-methoxy-phenyl)-4-thiazolidinone derivatives with high potent inhibitory effects on the proliferation of both cancer cell lines. Furthermore, several compounds with potent antiproliferative activities displayed excellent inhibitory activities on migration with an IC 50 of about 0.05 μM on MDA-MB-231 cells in two different migration assays. In particular, compound 39 was indicated to suppress tumor growth and metastasis as well as promote survival rate. Intriguingly, this series of analogs have been indicated to inhibit tumor cell proliferation through inducing cell cycle arrest . These results suggested that the new series of 2-(3-(arylalkyl amino carbonyl)phenyl)-3-(2-methoxyphenyl)-4-thiazolidinone derivatives could be regarded and developed as novel highly potential anticancer agents in the future.
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