ACS Applied Materials & Interfaces
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2023
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IF 9.5
Li Zhang,Xinxin Li,Ye Tian,Bin Hao,Jiufang Han,Hong Chen,Bingsuo Zou,Chunhua Du
Inorganic perovskites have received much attention due to their stability and high performance in luminescence, photoelectric conversion, and photodetection. However, perovskite optoelectronic devices prepared by the solution technique are still suffering from time-consuming and complex operations. In this paper, a single-crystal perovskite-based photodetector (PD) is prepared by very fast one-step deposition of synthesizing microplatelets (MPs) on the electrode directly. The saturated precursor is carefully optimized by adding appropriate antisolvent chlorobenzene (CB) to fabricate the MPs with their PL wavelength ranging from 418 to 600 nm. Furthermore, the PDs with a low dark current on order of nanoangstroms, high responsivity and detectivity of up to 10.7 A W–1 and 1012 Jones, respectively, and an ultrafast response rate featured by 278/287 μs (rise/decay time) are achieved. These all-inorganic perovskite PDs with a simple fabricating process and tunable detection wavelength meet the evolution tendency of PDs toward low cost and high performance, which is a high-profile strategy to realize high-performance perovskite PDs.
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高影响因子
Catalysts
·
2023
·Vol. 13
·期 4
·751
·
IF 3.9
Jikun Chen,Yan Gu,Shishi Xu,Yunxiang Zhang,Zhe Zhang,Lin Shi,Zhichao Mu,Chenliang Zhou,Jiali Zhang,Qinfang Zhang
Developing efficient photocatalyst for the photoreduction of CO2and degradation of organic pollutants is an effective alternative to address increasingly serious energy problems and environmental pollution. Herein, the isostructural Sillén–Aurivillius oxyhalides, Bi7Fe2Ti2O17X (X = Cl, Br, and I; BFTOX), are fabricated for CO2reduction and degradation of organic pollutants for the first time. Density functional theory (DFT) calculations show that the valence band maximum (VBM) of BFTOC and BFTOB is contributed by the dispersive 2porbitals of O-atoms, providing the narrow band gap (Eg) and possibly the stability against self-decomposition deactivation. The photocatalytic activities of BFTOX are strongly affected by the halogens (Cl, Br, and I), namely, the BFTOCl sample displays outstanding activity improvement (3.74 μmol·g−1·h−1) for photocatalytic performance. This is mainly attributed to the high separation of charge carriers, small optical band gap, and extended optical absorption. This work focuses on affording a reference to develop efficient and stable photocatalysts from Sillén-Aurivillius layered oxyhalide materials.Keywords:Sillén–Aurivillius;Bi7Fe2Ti2O17X;photocatalyst;degradation;CO2reduction
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International Journal of Nanomedicine
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2023
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IF 8
Yongai Xiong,Tingting Chen,Lei Chen,Rongshan Cai
Introduction Radiotherapy and chemotherapy are the fundamental causes of myelosuppression in cancer patients, which usually induce a serious hematopoietic system toxicity, causing the hemocytes and immunity decline of patients. Ziyuglycoside I (ZgI), an active ingredient isolated from traditional Chinese medicine Sanguisorba officinalis L, has been demonstrated to increase the leucocytes and protect hematopoietic stem cells, which is related to its promotion of autophagy in hematopoietic stem cells.Methods In the present study, we formulated the SH-PEG-NH2-coated gold nanoparticles loading ZgI (ZgI-AuNPs) with a enhanced autophagy promotion in hematopoietic stem cells. ZgI-AuNPs were prepared by HAuCl4-sodium citrate reduction method, and the synthesis of ZgI-AuNPs was validated by XRD, FT-IR, DSC, and TEM findings. Furthermore, the drug loading rate and the release of ZgI were evaluated, and the ZgI-AuNPs’ effects on autophagy and immunofluorescence staining for LC3B were tested. Finally, the effect of ZgI-AuNPs on the autophagy and hematopoietic ability of HSCs in vivo was also carried out.Results The prepared ZgI-AuNPs have an irregular cubic crystal structure by TEM observation, and the average particle size was 340 ± 16.5 nm determined by DLS. The XRD, FT-IR and DSC detection showed that the ZgI had been well loaded in AuNPs, and the AuNPs can load the ZgI at a content of 160.63 ± 1.35 μg·mg−1. Meanwhile, the AuNPs can reduce the drug release rate of ZgI. Importantly, the ZgI-AuNPs enhanced autophagy of HSCs both in vitro and in vivo. At the same time, the gold nanoparticles enhance the hematopoietic effect of ZgI on mice HSCs.Conclusion Our research suggests that SH-PEG-NH2-coated gold nanoparticles loading ZgI has potential application in myelosuppression therapy.
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高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 9
·2203028
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IF 9
Guozhen Li,Qiwen Pan,Zhihao Zhou,Ranran Gu,Hao Zhang,Xiongjian Huang,Guoping Dong,Xiudi Xiao
Perovskite CsPbX 3 (X = Cl, Br, I) nanocrystals with advantages of high quantum yield, narrow emission peaks, and tunable fluorescence are considered as the next generation of light-emitting sources. However, fluorescence degradation due to the poor stability of perovskite nanocrystals in moisture, high temperature, and illumination remains one of the greatest challenges in their further development. In this work, a fully dense coating strategy is proposed to improve the overall stability of perovskite nanocrystals, especially under high-density laser irradiation. A mesoporous silica SiO 2 layer is introduced to construct a stable coating for isolating the perovskite from external environment. To eliminate the pores of the CsPbX 3 @SiO 2 , an inorganic glass is also employed via solution-combustion technique to generate a fully compact encapsulation for further stability promotion. The as-prepared nanocrystal-in-glass composite exhibits efficient and stable fluorescence performance in luminous efficiency, chromaticity, and long-term reliability in the conditions of thermal shock, humidity, and blue laser irradiation. With the integration of red/green/blue emitting nanocrystals, the color gamut of the white laser lighting source covers 134% of the National Television Standards Committee standard, providing exciting opportunity for high performance laser-driven white light generation.
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COMBUSTION AND FLAME
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2019
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IF 4.12
Wei Li,Yan Zhang,Bowen Mei,Yuyang Li,Chuangchuang Cao,Jiabiao Zou,Jiuzhong Yang,Zhanjun Cheng
Flow reactor pyrolysis and laminar flame propagation are investigated for n -propanol and i -propanol, which are the smallest alcohol fuels with isomeric structures. Pyrolysis products of propanol isomers at 0.04–1 atm are detected using the synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS). Experimental observations demonstrate ethylene and propene are respective dominant hydrocarbon products in the n -propanol and i -propanol pyrolysis, while the most abundant oxygenated products are formaldehyde, acetaldehyde and ethenol in the n -propanol pyrolysis and acetone and acetaldehyde in the i -propanol pyrolysis. Higher concentrations of aromatic and oxygenated pollutants are observed in the i -propanol pyrolysis. The laminar burning velocities of propanol isomers are measured in a high-pressure constant-volume cylindrical combustion vessel at the initial temperature of 423 K, pressures of 1–10 atm and equivalence ratios of 0.6–1.5. A general trend that n -propanol has much faster LBVs than i -propanol is noticed under all investigated conditions. A kinetic model of propanol isomers is developed and validated against the present experimental data, as well as other experimental data in literature covering wide ranges of temperatures, pressures and equivalence ratios. Rate of production analysis and sensitivity analysis are performed together to provide insight into the fuel isomeric effects on key reaction pathways and fuel reactivities. In the flow reactor pyrolysis, different dominant primary decomposition pathways of n -propanol and i -propanol lead to the differences in both molecular structures and concentration levels of pyrolysis products. In laminar flame propagation, different radical pool distributions of propanol isomers are illustrated and found to be largely influenced by fuel isomeric structures. The linear structure of n -propanol promotes the formation of more active radicals like formyl, vinyl and ethyl, while the branched structure of i -propanol facilitates the production of more stable radicals including methyl and allyl. Thus, the promoted chain-branching in n -propanol flames and enhanced chain-termination in i -propanol flames can explain the higher laminar burning velocities and reactivities of n -propanol than that of i -propanol.
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Science China-Chemistry
·
2019
·Vol. 62
·期 6
·767-774
·
IF 6.085
Li Erpeng,Li Wenqin,Li Linchang,Zhang Hao,Shen Chao,Wu Zihua,Zhang Weiwei,Xu Xiaojia,Tian He,Zhu Wei-Hong,Wu Yongzhen
The development of p-i-n structured perovskite solar cells (PSCs) requires more extensive explorations on seeking efficient, low cost and stable hole transporting materials (HTMs). Small molecular HTMs are superior to polymeric ones in terms of synthetic reproducibility as well as purity. However, thin films composed of small molecules are usually labile during the solution-based perovskite deposition. Herein, we propose a molecular engineering strategy of incorporating oligothiophene as conjugation bridge to develop robust oligomer HTMs for p-i-n type PSCs. Upon increasing the oligothiophene chain length from α-bithiophene to α-quaterthiophene and α-hexathiophene, their HOMO energy levels remain unchanged, but their solubility in common organic solvents decreased remarkably, thus greatly enhancing their tolerance to the perovskite deposition. The rational design of oligothiophene chain length can effectively tune their optoelectronic properties as well as thin film stability under polar solvent soaking. The best performance is achieved by an α-quaterthiophene based HTM (QT), showing a high efficiency of 17.69% with fill factor of 0.81, which are comparable to those of a commercially available benchmark polymer HTM (poly[bis (4-phenyl)(2,4-dimethylphenyl) amine], PTAA) based devices fabricated under the same conditions. Our developed oligomer system not only provides the definite molecular structures like small molecule-type HTMs, but also exhibits the excellent film-forming like polymer-type HTMs, thus achieving the well-balanced parameters among solvent tolerance, thin film conductivity, and interfacial charge transfer efficiency, especially building up a platform to develop low cost and reproducible efficient HTMs in p-i-n structured perovskite solar cells.
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ELECTROCHIMICA ACTA
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2018
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IF 5.116
Jiangping Jing,Zhuoyuan Chen,Chang Feng
Graphitic carbon nitride (g-C 3 N 4 ) usually shows amphoteric property in a neutral solution. In this work, a K&I co-doped g-C 3 N 4 is prepared by simply sintering the mixture of dicyandiamine, KI and I 2 . The K&I co-doping modulates the band structure of g-C 3 N 4 with pulling the Fermi level toward its conduction band minimum. The obtained K&I co-doped g-C 3 N 4 (K&I-C 3 N 4 ) generates positive photocurrents over the whole investigated potential range, exhibiting a typical n-type semiconductor characteristic. Therefore, the K&I co-doping transforms the g-C 3 N 4 from amphoteric to n-type semiconductor. Also, the prepared K&I-C 3 N 4 shows widened light absorption range and enhanced separation efficiency of the photogenerated charge carriers, which results in the dramatically enhanced photoelectrochemical performance.
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JOURNAL OF POWER SOURCES
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2019
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IF 7.467
Junjie He,Fan Zhang,Yuren Xiang,Jiarong Lian,Xin Wang,Youming Zhang,Xiao Peng,Pengju Zeng,Junle Qu,Jun Song
As a post graphene low dimensional material developed in the last two years, antimonene has attracted much attention. In contrast to graphite based low dimensional materials, antimonene is a bandgap semiconductor material, similar to black phosphorus, but its higher stability facilitates practical applications. Till to date, extensive theoretical studies have been conducted to explore their unique properties, but there are only a few experimental studies on their properties, let alone their applications. Therefore, in this study, high-quality antimonene oxide based low dimensional materials are prepared using a liquid exfoliation method in butanol . It is found that the antimonene oxide quantum dots have proper energy level alignment with CH 3 NH 3 PbI 3 . Consequently, they are successfully applied for perovskite solar cells based on copper doped nicklus oxide hole transfer layer, providing improved power conversion efficiency from 15.7% to near 18%. Detailed investigation shows that the performance improvement arises from enhanced charge extraction between hole transfer layer and perovskite. This study surely paves the way for the application of antimonene oxide based low dimensional materials in photovoltaic devices .
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RSC Advances
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2018
·Vol. 8
·期 13
·7102-7109
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IF 2.936
Lei Tao,Yuanbo Huang,Xiaoqin Yang,Yunwu Zheng,Can Liu,Mingwei Di,Zhifeng Zheng
Carbon nanofibers (CNFs) with excellent electrochemical performance represent a novel class of carbon nanostructures for boosting electrochemical applications, especially sustainable electrochemical energy conversion and storage applications. This work builds on an earlier study where the CNFs were prepared from a waste biomass (walnut shells) using a relatively simple procedure of liquefying the biomass, and electrospinning and carbonizing the fibrils. We further improved the mass ratio of the liquefying process and investigated the effects of the high temperature carbonization process at 1000, 1500 and 2000 °C, and comprehensively characterized the morphology, structural properties, and specific surface area of walnut shell-derived CNFs; and their electrochemical performance was also investigated as electrode materials in Li-ion batteries. Results demonstrated that the CNF anode obtained at 1000 °C exhibits a high specific capacity up to 271.7 mA h g−1 at 30 mA g−1, good rate capacity (131.3 and 102.2 mA h g−1 at 1 A g−1 and 2 A g−1, respectively), and excellent cycling performance (above 200 mA h g−1 specific capacity without any capacity decay after 200 cycles at 100 mA g−1). The present work demonstrates the great potential for converting low-cost biomass to high-value carbon materials for applications in energy storage.
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高影响因子
CERAMICS INTERNATIONAL
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2018
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IF 3.057
Jingkun Yuan,Peigang He,Xiaomin Liang,Dechang Jia,Lingyu Jia,Delong Cai,Zhihua Yang,Xiaoming Duan,Shengjin Wang,Yu Zhou
In this paper, a high temperature treatment procedure was designed to evaluate the effect of holding temperature on thermal evolution process of Li + substituted Cs-based geopolymer (Cs 0.7 Li 0.3 GP), including the thermal analysis, phase composition and microstructure evolution. With rising of holding temperature, amorphous unheated Cs 0.7 Li 0.3 GP gradually transformed into a multiphase system during the high temperature treatment process, which consisted of pollucite (CsAlSi 2 O 6 ), spodumene (LiAlSi 2 O 6 ) and amorphous glass phase. In the multiphase system, Cs + ions were in the form of pollucite grains, while Li + ions were in the form of spodumene nanocrystallines distributed in amorphous matrix. The pollucite grains gradually coarsened with rise in holding temperature, and the densification of the resulting products were also improved synchronously, which were related to the presence of amorphous glass phases. The amorphous glass phase would be in a molten state when holding temperature over 800 °C. And the presence of molten amorphous phase would make the mass transfer process easier, which could contribute to the growth of the crystal grains and the elimination of the pores.
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高影响因子
MICROCHEMICAL JOURNAL
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2018
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IF 2.746
Bin Zhou,Xin-Yi Yang,Yong-Sheng Wang,Jie-Can Yi,Zhen Zeng,Huan Zhang,Ya-Ting Chen,Xi-Jiang Hu,Qing-Li Suo
A label-free fluorescence aptasensor based on conformational switching of aptamer induced by Cd 2+ was established for the good selective determination of Cd 2+ . The aptamer could act as a recognition element for Cd 2+ . SYBR green I (SG), as a signal reporter, can bind to the small groove of double-stranded DNA (dsDNA) constituted the aptamer and the complementary strand, establishing the dsDNA-SG complex and generating high fluorescence intensity . In the presence of Cd 2+ , the specific recognition and binging of aptamers preferentially with Cd 2+ induce free of complementary strands from dsDNA and conformational switching of aptamer from dsDNA to a stem-loop structure, fluorescence intensity of system decrease dramatically. Under the optimum experiment parameters, the aptasensor shows a good linear range from 1.12 μg L −1 to 224.82 μg L −1 and the excellent detection limit as low as 0.34 μg L −1 . The relative standard deviations (RSD) for determination of Cd 2+ (n = 8) were lower than 4%, and the recoveries were in the range of 98.57% ~ 102.49%. The use of fluorescence aptasensor has good selectivity and does not require any sample treatment or target preconcentration for the detection of Cd 2+ in real samples.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2017
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IF 1.591
Lin Yang,Shengfang Li,Chunyan Sun
A new Cs(I) magnetic ion-imprinted polymer (Cs(I)-MIIP) aimed at the selective adsorption and separation of Cs(I) from salt lake brine was prepared. The Fe3O4@SiO2 was used as supporter, Cs(I) as template ion, and carboxymethyl chitosan as functional monomer. The product was characterized by Fourier transform infrared spectra, XRD, energy-dispersive spectrometry, scanning electron microcopy, thermogravimetric analysis, and vibrating sample magnetometer. The adsorption of the Cs(I)-MIIP in solution was investigated, which indicated the maximum adsorption capacity was 36.15 mg·g−1 under the optimum conditions. The pseudo-first-order kinetic model and the Freundlich isotherm model were applied to predict the adsorption process of Cs(I) onto Cs(I)-MIIP. Selectivity experiments showed that the relative selectivity coefficient (k′) were 24.995, 1.73, 1.43, 4.83, and 1.63 to Cs(I)/Li(I), Cs(I)/Na(I), Cs(I)/K(I), Cs(I)/Rb(I), and Cs(I)/Sr(II) binary solutions, higher than those of NIP, respectively. Furthermore, the Cs(I)-MIIP was successfully applied to the enrichment and separation of Cs(I) from the salt lake brine of Qinghai, with satisfactory Cs(I) recovery rates.
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