Solar RRL
·
2019
·Vol. 3
·期 10
·1900131
·
IF 0
Afei Zhang,Zhengji Zhou,Wenhui Zhou,Dongxing Kou,Yuena Meng,Yafang Qi,Shengjie Yuan,Sixin Wu
A back contact interface in a kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) photovoltaic device plays an important role in fabricating high quality semiconducting photoactive layers and improving carrier extraction efficiency. However, uncontrolled decomposition reactions between the CZTSSe absorber layer and Mo electrode result in high series resistance and recombination at the back interface. The insertion of high work function MoO 3 as an interfacial layer is considered as a promising way to engineer the back contact. This highlights the importance of elucidating the chemistry and dynamics of MoO 3 at the Mo/kesterite interface in the CZTSSe annealing process. Herein, A detailed investigation of the elemental diffusion and chemistry of the back contact with the MoO 3 intermediate layer during selenization is carried out. The results demonstrate that the presence of the MoO 3 interfacial layer largely suppresses the chemical reaction between Mo and CZTSSe in the annealing process, inducing high quality CZTSSe absorbing films with fewer voids and reducing the thickness of MoSe 2 from 209 to 84 nm when the optimized thickness of MoO 3 is 10 nm. This finally leads to the increase in device efficiency from 9.02% to 10.92%, and the best performance where an efficiency of 11.37% is achieved.
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TALANTA
·
2019
·
IF 4.916
Shuyan Ge,Jingbo He,Chenxing Ma,Jiyang Liu,Fengna Xi,Xiaoping Dong
Heteroatom doping can endow graphene quantum dots (GQDs) with various new or improved structural, optical and physicochemical properties. In contrast to the widely reported oxygen, nitrogen or sulfur doping in GQDs, simple and scalable synthesis of boron-doped GQDs (B-GQDs) with high yield and quantum yields remains challenge. In this work, B-GQDs are one-step synthesized and serve as the fluorescence probes for the fabrication of sensors towards Fe 3+ ion or phosphate (Pi) as well as biosensor towards cytochrome C (Cyt C). The B-GQDs are facile synthesized using one-step bottom-up molecular fusion between 1,3,6-trinitropyrene and borax in sodium hydroxide under hydrothermal process. The synthesis can be performed using large volume autoclave (500 ml) with a high yield of 71%, indicating possibility for gram-scale production of B-GQDs. The as-prepared B-GQDs exhibit single or bilayer graphene structure, high crystallinity , uniform size, bright (absolute photoluminescence quantum yield of 16.8%) and excitation-independent green fluorescence (maximum excitation wavelength and emission wavelength of 480 nm and 520 nm, respectively). Successful doping of B atoms in the lattice of GQDs enables high selectivity towards Fe 3+ . Based on quenching of fluorescence of B-GQDs by Fe 3+ (turn-off model), detection of Fe 3+ (with limit of detection-LOD of 31.2 nM) and Fe 3+ -rich Cyt C (with LOD of 5.9 μg/ml) are demonstrated. As Pi can recover Fe 3+ -quenched fluorescence of B-GQDs (turn-off-on model), indirect fluorescent detection of Pi is also achieved with LOD of 340 nM. In addition, detection of Fe 3+ , Cyt C and Pi in real samples is achieved.
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PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 32
·18098-18105
·
IF 3.049
Lamaocao Ma,Hengchang Ma
In this study, we report the synthesis of π-conjugated network polymers via palladium-catalyzed direct arylation polycondensation of triphenylamine (TPA) and tetraphenylethylene (TPE) with different active substrates. Moreover, six conjugated porous polymers were obtained (named as TPA-TPA-MA, TPA-PB-MA, TPA-TFB-MA, TPA-TPE-MA, TPE-PB-MA, and TPE-TFB-MA). Then, the fluorescence properties in the solid and dispersed states, the corresponding microporous structures, and the Brunauer–Emmett–Teller (BET) surface areas of all polymers were well studied. Among the obtained materials, TPA-PB-MA possessed not only largest BET surface area (686 m2 g−1) and largest pore volume (0.716 cm3 g−1), but also the smallest pore size of 0.823 nm. These properties are very beneficial for the application of TPA-PB-MA in CO2 storage and PA sensing. At 1 bar, TPA-PB-MA demonstrated the significant CO2 uptake of 2.70 and 1.35 mmol g−1 at 273 and 298 K, respectively. Furthermore, TPA-PB-MA was most sensitive and selective towards PA recognition. The KSV constant was measured as 4.0 × 104 M−1.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 33
·47887
·
IF 2.188
Tiantang Fan,Wuyou Ye,Beibei Du,Qin Zhang,Li Gong,Jiafeng Li,Shengli Lin,Zhongyong Fan,Qing Liu
A series of high-molecular-weight terpolymers named PTG- b -LG and PT- b -LG were synthesized based on the macroinitiators of PTG copolymers and PTMC, respectively. In vitro degradation of PTG- b -LG and PT- b -LG was carried out by immersing into PBS, in comparison with that of P L LA. Mass loss, water uptake, GPC, DSC, WAXD, and 1 H NMR were examined for the degradation study. It was found that PTG- b -LG degraded faster than PT- b -LG and P L LA due to the Di -random block structure, which had lower regularity of chain and lower crystallinity. The compositional changes appeared to be more complex, but the molar mass decreased owing to chain fragmentation caused by hydrolysis. Moreover, morphological changes were also observed during the degradation in all situations with the crystallization of by-products and a preferential degradation of amorphous domains. Specifically, PTG- b -LG presented an adjustable degradation rate and may be used for the fabrication of totally biodegradation stents in the future. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47887.
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高影响因子
CHEMICAL PAPERS
·
2019
·Vol. 74
·期 2
·485-497
·
IF 1.246
Quan Cong,Liu Jiayu,Sun Wei,Cheng Xinjian
It is extremely necessary to detect heavy metals sensitively and selectively, especially the ions that will cause great harm to humans and the environment. This work deals with two fluorescent chemosensors and their outstanding role when detecting Zn 2+ and Cd 2+ ions. First, a small molecular chemosensor (TPB) has been designed and synthesized via Suzuki reaction using one part of benzene-1,3,5-triyltriboronic acid and three parts of 2-bromo-1, 10-phenanthroline as starting materials. And then, its corresponding macromolecular fluorescent chemosensor (PTPB) was synthesized. The infrared spectra, mass spectrometry (MS), and 1 H-NMR were used to study the structures of TPB and PTPB. From what has been studied, the TPB and PTPB were stable in a relative wide pH range. As soon as the Cd 2+ and Zn 2+ ions added, fluorescence of the two sensors TPB and PTPB was changed obviously. In addition, PTPB was found have better performance to both Cd 2+ and Zn 2+ than TPB through the ‘‘molecular wire’’ mechanism. Job’s plots were also be tested, showing that the combination ratio of TPB and PTPB to Cd 2+ and Zn 2+ were both 3:1 (ion/sensor). In addition, the minimum detection limits of the macromolecular chemosensor PTPB for Cd 2+ and Zn 2+ reached 0.424 μM and 1.27 μM, respectively.
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 27
·16347-16355
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IF 10.733
Zhangxin Chen,Ning Xu,Weijun Li,Ruiyang Zhao,Yujie Dong,Junlei Liu,Chang Su,Jianli Wang,Cheng Zhang
The common LiPF6 electrolyte in lithium batteries often contains trace water (∼10 ppm) and hydrofluoric acid (∼20 ppm). But the possible influence of this trace HF on the performance of Li–organic batteries with organic cathode materials is still not clear. In this paper, a novel N-heterocycle based conjugated microporous polymer PTPADTz based on the triphenylamine–bitriazine group was prepared. The polymer PTPADTz was found to possess a high surface area (∼657 m2 g−1) and an abundant microporous structure. Using PTPADTz as the cathode material in lithium batteries with the LiPF6 electrolyte, apart from the voltage platform of triphenylamine around 3.75 V, a new and unstable low voltage platform at ∼2 V was also observed, which did not correspond to the n-doping process of bitriazine groups according to electrochemistry results. Furthermore, it faded rapidly and disappeared in 20 cycles with an irreversible capacity loss. Such an uncommon phenomenon was not observed in the same lithium batteries with the LiClO4 electrolyte. UV-vis spectra and electrochemistry results showed that the PTPADTz film exhibited an obvious red-shift in the LiPF6 electrolyte similar to that in HCl solution and the HF/LiClO4 electrolyte, with the film color in both changing from yellow to a shade of red, which were not observed in the LiClO4 electrolyte. Thus the uncommon low voltage platform at ∼2 V in the LiPF6 electrolyte might be ascribed to the acid-doping effect of the trace HF in the electrolyte, which bonded with the electron pairs of nitrogen in triazine to increase its electron affinity and produce another new n-doping behavior. The open lithium battery experiments clearly demonstrated the in situ color change related to the doping and dedoping behavior during the whole charge/discharge process, further confirming that the acid-doping of the trace HF into the triazine group was the origin of the observed low voltage platform. Hence, this study may provide new insight into the influence of trace H+ in the electrolyte on the performance of Li–organic batteries.
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高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 34
·4382-4389
·
IF 2.378
Fanglin Ming,Jingzhou Hou,Danqun Huo,Jun Zhou,Mei Yang,Caihong Shen,Suyi Zhang,Changjun Hou
A luminescent amino-functionalized metal–organic framework (Cu–MOFs) was synthesized from 2-aminoterephthalic acid and Cu(II) ions by a solvothermal method. Cu–MOFs displayed blue fluorescence with a peak at 430 nm under 330 nm excitation. Its structure was characterized by FTIR, TEM, XRD, and XPS. The fluorescence of the Cu–MOFs was quenched by Fe3+ in aqueous solutions. The limit of detection was 0.5 μM, and the linear working range extended from 2 μM to 35 μM. Additionally, a good logarithmic relationship between relative fluorescence intensity (F/F0) and Fe3+ concentrations ranging from 2 to 180 μM was obtained with a detection limit of 1.56 μM (R2 = 0.9975). No clear interference was observed when challenged with a wide variety of cations and anions. The recoveries from spiked real water samples were in the range of 91.7–107.7%, and the detection results were consistent with inductively coupled plasma mass spectrometry (ICP-MS) results. Therefore, the fluorescent sensor has great potential in environmental monitoring.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 48
·19223-19231
·
IF 3.069
Yingying Lv,Jiayu Lin,Siyan Peng,Laijun Zhang,Leshu Yu
The practical application of ZnO nanopowders (NPs) in purifying wastewater could be determined by some issues, such as low-cost and scalable preparation, high photocatalytic activity, antiphotocorrosion, and convenient recycling. In this contribution, a series of ZnO NPs were prepared in a scalable way in the 220 °C, 250 °C and 280 °C autoclaves, respectively. The structural, morphological and surface details of the samples were systematically examined by XRD, SEM, FT-IR, TEM, Raman, PL, and UV-visible spectroscopy. Along with the increase of the reaction temperature, the mean diameter of ZnO NPs increased in the range of 110–130 nm, and the color of the products was lighter, resulting in a smaller surface area but a stronger UV absorbance in the region of 200–400 nm. Moreover, the preferential growth along the (002) plane, the crystalline degree and the green emission intensity of ZnO 280 are more overt than those of ZnO 250 and ZnO 220. Some other parameters including stretching vibration and E2(high) mode of Zn–O bonding or diffraction peaks of ZnO 280 also shifted to lower wavenumbers or lower angles when compared to those of ZnO 220, revealing the existence of more oxygen vacancies in ZnO 280. As expected, ZnO 280 showed the best photocatalytic activity and antiphotocorrosion among the three samples in the degradation of rhodamine B due to the availability of abundant oxygen vacancies, preferential growth along the (002) direction and the high crystalline degree. This suggests that, along with the increase of the preparation temperature, the obtained ZnO nanopowders exhibit better photocatalytic activity. Therefore this work could provide a route to synthesize well crystalline ZnO nanopowders and open up an avenue for commercial applications of ZnO NPs in the treatment of organic wastewater.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Jingyang Luo,Ying Zhu,Qin Zhang,Miao Cao,Wen Guo,Han Li,Yang Wu,Hui Wang,Yinglong Su,Jiashun Cao
This study explored the influences of peroxydisulfate (PDS) and peroxymonosulfate (PMS) activated with different catalysts on the anaerobic fermentation of waste activated sludge (WAS). All the treatments were effective in promoting short-chain fatty acids (SCFAs) production, particularly acetic acid, in the order of PMS/MnO 2 > PMS/Zn > PDS/Zn > PMS/Fe > PDS/Fe > PDS/MnO 2 . Mechanistic investigations demonstrated that WAS disintegration was intensely induced by the free radicals ( i.e., SO 4 − and OH) generated in PDS and PMS treating reactors. It significantly promoted the solubilization and hydrolysis processes and thereby provided sufficient bioavailable substrates for further acidogenic metabolisms. Additionally, it enlarged the abundance of functional bacteria responsible for SCFAs production. The simultaneous promotion of bioavailable substrates and fermentative microorganisms markedly contributed to the SCFAs enhancement. Moreover, the dewaterability and stabilization of fermented sludge were both improved with the PDS and PMS treatments, which were beneficial to the final disposal of WAS.
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高影响因子
Chinese Physics B
·
2018
·Vol. 27
·期 6
·066108
·
IF 1.321
Qing Yu,Jiangjian Shi,Pengpeng Zhang,Linbao Guo,Xue Min,Yanhong Luo,Huijue Wu,Dongmei Li,Qingbo Meng
A study of the self-healing phenomenon of Cu2ZnSn(S, Se)4 (CZTSSe) solar cells has shown more than 10% enhancement in cell performance after storage at room temperature for a week, with a significant improvement in the open-circuit photovoltage (Voc) and fill factor (FF). In addition, up to 10.45% power conversion efficiency (PCE) has been achieved. No obvious change in crystallinity, crystal phase, optical absorption or elemental distribution in the CZTSSe films was detected on examining the x-ray diffraction (XRD) pattern, Raman spectrum, ultraviolet-visible (UV-Vis), and TOF-SIMS. Further investigations on the charge carrier concentration, charge radiative recombination, and band structure suggest that the enhancement in PCE stems mainly from a reduction in deep defects of the CZTSSe semiconductor film.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Jiande Dong,Meiying Liu,Ruming Jiang,Hongye Huang,Qing Wan,Yuanqing Wen,Jianwen Tian,Yanfeng Dai,Xiaoyong Zhang,Yen Wei
Fluorescent probes have long been regarded as tools for imaging living organisms with advantages such as high sensitivity, good designability and multifunctional potential. Many fluorescent probes, especially the probes based on aggregation-induced emission (AIE) dyes, have received increasing attention since the AIE phenomenon was discovered. These AIE dye-based fluorescent probes could elegantly overcome the notorious quenching effect caused by aggregation of conventional organic dyes. However, it is still difficult to directly apply these AIE-active dyes for biomedical applications owing to their hydrophobic nature. Therefore, the development of novel and facile strategies to endow them with water dispersibility is of critical importance. In this work, we exploit an efficient and simple strategy to fabricate an AIE dye-based fluorescent copolymer through the combination of reversible addition-fragmentation chain transfer and the Biginelli reaction . Moreover, the copolymer can self-assemble to fluorescent polymeric nanoparticles (FPNs) in water solution. Hydrophilic poly(PEGMA- co -AEMA) was reacted with the AIE-active dye 4′,4‴-(1,2-diphenylethene-1,2-diyl)bis([1,1′-biphenyl]-4-carbaldehyde (CHO-TPE-CHO) to form amphiphilic luminescent polymers using urea as the connection bridge. The successful synthesis of the final products (poly(PEGMA- co -AEMA-TPE) FPNs) was confirmed by various instruments. Furthermore, Transmission electron microscopy (TEM) images manifest that poly(PEGMA- co -AEMA-TPE) copolymers will self-assemble into spherical nanoparticles in aqueous environments with sizes between 100 nm and 200 nm. The cell uptake and bioimaging experiment confirm that poly(PEGMA- co -AEMA-TPE) FPNs have excellent biocompatibility and emit strong green fluorescence in a cellular environment. Thus, poly(PEGMA- co -AEMA-TPE) FPNs are excellent candidates for biomedical applications.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Shuailing Huang,Yinglong Wu,Fang Zeng,Junjie Chen,Shuizhu Wu
Abnormally-expressed leucine aminopeptidase (LAP) is associated with diverse physiological and pathological disorders; hence developing a highly selective and sensitive detection system for LAP is of great significance. Herein, a fluorescent light-up system with aggregation-induced emission (AIE) characteristic, (DPA-TPE-Leu) has been developed for detecting LAP, in which the recognition unit l -leucine amide group also acts as the hydrophilic moiety. Upon LAP-triggered enzymatic reaction , l -leucine amide moiety is cleaved from the probe molecule, resulting in the formation and aggregation of the hydrophobic reaction product (DPE-TPE-OH) with AIE effect and thus giving out the turn-on green fluorescence. The system features excellent photostability, large Stokes shift (194 nm), good water solubility, high sensitivity with the detection limit of 0.16 U L −1 , favorable specificity and low cytotoxicity. It has been effectively utilized in fluorescent imaging of endogenous LAP in living cells, and also successfully applied for fluorescent imaging of HepG2 xenograft tumor. Such a fluorescent assay could provide a convenient and sensitive method for detecting LAP activity and might aid in the auxiliary diagnosis of hepatocellular carcinoma and related pathological analysis in biopsy.
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高影响因子
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