Nanoscale Research Letters
·
2022
·Vol. 17
·期 1
·1-9
·
IF 5.418
Zhou Zhuoli,Liao Guangmeng,Song Xinyu,Dai Qinyong,Sun Lei,Peng Yingquan,Wang Peng
As an important classification of photodetectors, broad spectral photodiodes are ubiquitous in the fields of industry and scientific research. Here, we reported a type of broad spectral organic–inorganic hybrid photodiodes (OIHPDs) based on planar-bulk heterojunction, which composed of 3,4,9,10-perylenetertracarboxylic dianhydride (PTCDA), copper phthalocyanine (CuPc) and fullerene (C 60 ). In our research, the dark current of the OIHPD with 10 nm C 60 film (10 nm-C 60 OIHPD) was as low as 25.6 μA, which is about 63 times smaller than the dark current of the OIHPD without C 60 film (C 60 -free OIHPD). It is considered that the significantly enhanced performance of 10 nm-C 60 OIHPD is attributed to the introduction of the C 60 film, which act as hole-blocking layer to reduce the dark current. And through the schematic energy level model combined with experimental measurements, the reason for the dark current change was well explained. Furthermore, the specific detectivity of 10 nm-C 60 OIHPD was almost one order of magnitude larger than it of C 60 -free OIHPD, and a notable enhancement of over 10 11 cm Hz 1/2 /W was obtained due to the fiercely reduced dark current. These results provide insights on how to improve the performance of organic photodiodes.
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POLYMER BULLETIN
·
2022
·Vol. 80
·期 1
·331-347
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IF 2.843
Wang Zejun,Ren Jiarui,Qian Lizhong,He Yufeng,Song Pengfei,Wang Rongmin
Using feather keratin (FK), a kind of biocompatible natural polymer being extracted from widely available and renewable waste feathers, and sodium alginate (SA) as materials, the FK conjugated SA gel beads (FK-SA-Gbs) were prepared with double cross-linked by calcium ion (Ca 2+ ) and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC). After being characterized and analyzed by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD), its pH responsiveness, salt ion responsiveness, and degradability were measured, and the loading capacity of model drug Rhodamine B (RhB) under various physical conditions, the cumulative release rate of the loaded gel beads in different pH buffer solutions were also investigated. The results showed that the FK-SA-Gbs had significant pH sensitivity and sustained release, and various physical conditions can meet the requirements of wound dressings. It indicated FK-SA-Gbs can be used as controlled release drug carriers and are expected to be used as drug carrier materials in biomedical applications. Graphical abstract FK conjugated SA gel beads (FK-SA-Gbs) was prepared by secondary cross-linking with CaCl 2 and 1-ethyl-3- (3-dimethylaminopropyl) carbodiimide hydrochloride (EDC/HCl) using feather keratin (FK) extracted from waste feathers, which have significant pH sensitivity and sustained release capability.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 6
·4221-4238
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IF 4.682
Xu Airong,Wang Wenqiang,Duo Tongtong,Wang Yongxin,Xiao Zhihong,Liu Rukuan
Polyethyleneimine (PEI) composites containing silicon have shown extraordinary potential in scavenging heavy metal ions, but usually suffer from difficulty in recycling/separating after usage, quite complex and time-consuming procedures, expensive and higher toxic starting materials or being processed desired shapes. To overcome these defects, here, high-performance PEI composite with unexpectedly enhanced elasticity and flexibility by Na 2 SiO 3 , for the first time, has been successfully constructed by a green one-step strategy at ambient conditions. Strikingly, the composite can be easily moulded into various shapes and displays excellent elasticity and flexibility like sponge. Moreover, after bending and compression, the original shape can be restored, which is impossible for conventional PEI composites containing silicon. Interestingly, the resultant composite displayed ultra-fast and ultra-strong water adsorption efficiency. Most importantly, the composite exhibits efficient Cu 2+ adsorption capacity. Furthermore, adsorption kinetics, thermodynamics and isotherms have also been investigated to reveal Cu 2+ adsorption behaviours of the composite. Graphical abstract
High-performance polyethyleneimine composite has been successfully constructed by a green and ultraconvenient strategy at ambient temperature using commercially available and low cost of starting materials PEI, polyethylene glycol diglycidyl ether and Na 2 SiO 3 .
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 5
·3280-3294
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IF 4.682
Xiang Xu,Zhu Ying,Yin Mingyu,Xia Shuang,Guo Chunwen
Reduced graphene oxide (rGO) has been studied as a possible substitute for graphene in many applications because it is cheaper and easier to prepare than graphene. RGO with low reduction degree has good hydrophilicity and can be stably dispersed in water. These properties are conducive to the preparation of hydrophilic composites. Here, the method of microwave reduction of GO suspension to prepare rGO with low reduction degree was studied. By controlling the reduction time, the rGO samples with different reduction degrees are prepared. After studying the characterization data of rGO with different reduction degrees, we propose the hypothesis of the reduction pathway of GO suspension, that is, the oxygen-containing groups on the surface of GO sheet are reduced first. FTIR, TGA and XPS data verify this hypothesis and are consistent with the simulation results. Therefore, the low reduction degree rGO has a large-area conjugated structure similar to graphene and also has good hydrophilicity due to the residual oxygen-containing groups on the periphery of the rGO sheet. This structure provides convenience for its composite with hydrophilic materials. In sum, the microwave reduction of GO suspension provides a simple method for researchers to prepare rGO with low reduction degree.
Graphical abstract
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IONICS
·
2023
·Vol. 29
·期 8
·3001-3012
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IF 2.8
Tang Haoqing,Zhao Siying,Weng Qiang,Liu Tao,Tang Zhiyuan,Liu Xiaotong
A novel strategy to improve the ionic conductivity of the Li 2 ZnTi 3 O 8 (LZTO) anode is proposed by embedding exfoliation and exchange of Li + montmorillonite (MMT) in LZTO particles. Li 2 ZnTi 3 O 8 and montmorillonite (LZTO-MMT) composites are shown to induce not only a high concentration of Li + in the interlamellar channel of MMT but also a reduction in the distance for Li + migration to ensure fast and stable Li + diffusion kinetics. Furthermore, the thus obtained LZTO and 6 wt% MMT (LZTO-6MMT), composed of fast Li + conductor MMT, exhibits increased Li + conductivities, excellent high-rate Li + storage capacities, and significant improvement in cycle reversibility. The LZTO-6MMT electrode delivers 219.6 mAh g −1 at a current density of 1.0 A g −1 after 500 cycles and shows an excellent high-rate performance of 127.8 and 112.0 mAh g −1 over 2000 cycles at 5.0 and 10.0 A g −1 , respectively. X-ray photoelectron spectroscopy and ex situ Raman spectrum analyses suggest that the chemical bonds and crystal structure remain stable after multiple Li + intercalation/deintercalation processes. To the best of our knowledge, this is the first report on the introduction of fast-ion conductor MMT into LZTO and its application to lithium-ion batteries.
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Probiotics and Antimicrobial Proteins
·
2023
·
IF 4.9
Shen Yong,Bai Xue,Wang Jiaxi,Zhou Xiran,Meng Rizeng,Guo Na
Methicillin-resistant Staphylococcus aureus (MRSA) is a notorious pathogen with biofilm-forming and drug-resistant properties that make it difficult to eradicate. In this study, the inhibition of MRSA (ATCC 43300) by Starmerella bacillaris CC-PT4 (CGMCC No. 23573) was evaluated. The results showed that the inhibition of MRSA growth and biofilm was caused by S. bacillaris CC-PT4 cell-free supernatant (CFS). The CFS of S. bacillaris CC PT4 at different times can effectively inhibit the formation of MRSA biofilm, remove the preformed biofilm, and down-regulate the related genes that promote the formation of biofilm. Afterwards, untargeted metabolomics was performed to analyze the CFS of S. bacillaris CC-PT4. Several molecules with antibacterial and inhibitory biofilm effects from the CFS were found, one of which, 2-amino-1-phenylethanol (APE), has not been reported to have antiMRSA ability before. In this study, molecular docking analysis and in vitro experiments were used to verify the function of APE to inhibit MRSA. These results indicate that S. bacillaris CC-PT4 CFS can effectively inhibit MRSA which has potential application value in controlling MRSA.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 43
·97147-97159
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IF 5.8
Xue Tao,Shao Feifei,Miao Han,Li Xinxin
Dye wastewater discharged from industries has caused serious environmental problems. The recent decade has witnessed adsorption technology emerging as an advanced dye wastewater treatment method with great potential Therefore, we fabricated two kinds of magnetic porous adsorbents (HSF and HSVF) with different specific surface areas and activity sites. Both of which exhibit excellent performance with remarkable dye adsorption capacities, especially HSVF. We further investigated their adsorption kinetic and isotherm in detail. Therein, HSVF showed a nice desorption capacity, and it could be recycled rapidly by magnetism, which exhibited the advantages of effective, easy operation, and low cost. In addition, their adsorption kinetic and isotherm were further studied and compared in detail. The results revealed that introducing strong active sites could improve both the adsorption capacity and rate effectively even though sacrificing part of specific surface areas, indicating that active sites might play a dominant role during the dye adsorption process. Graphical Abstract
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 9
·3741-3752
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IF 1.6
Yusheng Wang,Ying Dai,Wenmei Hu,Jinhua Xie,Qinqin Tao
Two Mg–Al layered bimetallic (hydrogen) oxides with uranium selective deposited space were obtained by intercalating bimetallic (hydrogen) oxides with L-serine with active amino and carboxyl sites, which showed excellent uranyl selectivity from cation mixture solutions of Ni 2+ , Co 2+ , Sr 2+ , Zn 2+ , La 3+ , Gd 3+ , Ce 3+ , and Sn 4+ . It was firstly proved in L-serine intercalated Mg–Al layered bimetallic (hydrogen) oxides. The key parameter, maximum uranium uptake amount, reached 1028.37 mg/g for LS-LDH and 1018.50 mg/g for MgAl-LDO/C at pH 4.5. These merits coupling with very high uptake capacity, highly cost effectivity, facile preparation and acceptable recycle performance makes LS-LDH and MgAl-LDO/C promising in the treatment of uranium-containing solutions. The study enables the understanding of selectively treating uranium-containing wastewater with L-serine intercalated Mg–Al layered bimetallic (hydrogen) oxides.
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Microsystems & Nanoengineering
·
2023
·Vol. 9
·期 1
·1-11
·
IF 7.9
Lyu Chaoyang,Wen Bo,Bai Yangzhen,Luo Daning,Wang Xin,Zhang Qingfeng,Xing Chenyang,Kong Tiantian,Diao Dongfeng,Zhang Xi
A novel bone-inspired fatigue-resistant hydrogel with excellent mechanical and piezoresistive properties was developed, and it exhibited great potential as a load and strain sensor for underwater robotics and daily monitoring. The hydrogel was created by using the high edge density and aspect ratio of graphene nanosheet-embedded carbon (GNEC) nanomaterials to form a three-dimensional conductive network and prevent the expansion of microcracks in the hydrogel system. Multiscale progressive enhancement of the organic hydrogels (micrometer scale) was realized with inorganic graphene nanosheets (nanometer scale). The graphene nanocrystals inside the GNEC film exhibited good electron transport properties, and the increased distances between the graphene nanocrystals inside the GNEC film caused by external forces increased the resistance, so the hydrogel was highly sensitive and suitable for connection to a loop for sensing applications. The hydrogels obtained in this work exhibited excellent mechanical properties, such as tensile properties (strain up to 1685%) and strengths (stresses up to 171 kPa), that make them suitable for use as elastic retraction devices in robotics and provide high sensitivities (150 ms) for daily human monitoring.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 30
·12221-12235
·
IF 4.5
Lin Huaizhi,Zhang Biao,Xie Wenqi,Wei Zhilei,He Kai,Xia Hongyan,Shi Zhongqi
SiC-B 4 C ceramic skeleton reinforced graphite composites (MCMB/SiC-B 4 C) with extraordinary mechanical performance were fabricated by SPS method. The influence of sintering temperature and volume ratio of B 4 C/SiC on the microstructure and mechanical performance of the composites was studied. With the introduction of B 4 C in the composites, the B atom diffusion at the B 4 C/graphite interface can be activated when the sintering temperature exceeded 1700 °C, which can significantly improve the interfacial combination of the skeleton reinforcement and graphite matrix. Therefore, the relative density and mechanical properties of the composites can be improved. While the sintering temperature reached 1800 °C and the volume ratio of B 4 C/SiC was 4:6 (the total amount of ceramic reinforcement phase was 40 vol%), the composite exhibited the optimal comprehensive performance with bending strength of 202 MPa and fracture toughness of 3.29 MPa·m 1/2 . These values were 146% and 58% higher, respectively, than those of the composite without B 4 C. The developed graphite matrix composites are expected to be applied to extreme conditions such as high load, high temperature and oxidation environments.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 8
·1-12
·
IF 5.7
Gao Lidi,Cui Hongshou,Guo Xinyu,Dong Qing,You Xingyu,Guo Xinshu,Qin Shili,Jia Lihua
A zeolitic imidazolate framework (ZIF)-8-silica hybrid monolithic column was prepared by one-step sol–gel method. The stationary phase in the monolithic column was characterized by Fourier-transform infrared spectra, X-ray diffraction, thermogravimetric analysis, nitrogen adsorption/desorption, and zeta potential. The results showed that ZIF-8-silica hybrid monolithic materials had abundant functional groups, good crystallinity, large specific surface area, and good thermal stability. A capillary electrochromatography (CEC) chiral separation system was for the first time constructed with ZIF-8-silica hybrid monolithic column and sulfobutylether-β-cyclodextrin (SBE-β-CD) as a chiral additive and was applied to separate the selected single and mixed chiral compounds (13 natural amino acids and 5 chiral pesticides). Under the optimized CEC conditions, all the single analytes achieved baseline separation with resolution of 2.14–5.94 and selectivity factor of 1.06–1.49 in less than 6 min, and the mixed amino acids with similar properties were also simultaneously enantioseparated (Rs ≥ 1.82). Relative standard deviations (RSDs) of migration time and column efficiency were lower than 4.26% and did not change significantly after 200 runs, evidencing excellent reproducibility and stability. These results demonstrate that the application of SBE-β-CD as a chiral additive for ZIF-8-silica hybrid monolithic columns is a promising method for the separation of chiral compounds. Graphical Abstract
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 19
·4753-4766
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IF 4.3
Sun Yue,Ma Su,Wang Hanyu,Wang Huili,Gao Ming,Wang Xuedong
Herein, we fabricated blue-fluorescence carbon quantum dots modified by ionic liquids (ILs-CQDs) with a quantum yield of 18.13% by employing orange peel as a carbon source and [BMIM][H 2 PO 4 ] as a dopant. The fluorescence intensities (FIs) of ILs-CQDs were significantly quenched upon the addition of MnO 4 − with excellent selectivity and sensitivity in waters, and this phenomenon provided a feasibility for constructing a sensitive “ON–OFF” fluoroprobe. The prominent overlapping between the maximum excitation/emission of ILs-CQDs and the UV–Vis absorption of MnO 4 − implied an inner filter effect (IFE). The higher K q value demonstrated that the fluorescence-quenching phenomenon was a static-quenching process (SQE). Coordination between MnO 4 − and oxygen/amino-rich groups in ILs-CQDs resulted in the alteration of zeta potential in the fluorescence system. Consequently, the interactions between MnO 4 − and ILs-CQDs belong to a joint mechanism of IFE and SQE. When plotting the FIs of ILs-CQDs vs. the concentrations of MnO 4 − , a satisfactorily linear correlation was obtained across the range of 0.3–100 μM with a detectable limit of 0.09 μM. This fluoroprobe was successfully applied to detect MnO 4 − in environmental waters with satisfactory recoveries of 98.05–103.75% and relative standard deviations (RSDs) of 1.57–2.68%. Also, it gave more excellent performance metrics as compared to the Chinese standard indirect iodometry method and other previous approaches for MnO 4 − assay. Overall, these findings offer a new avenue to engineer/develop a highly efficient fluoroprobe based on the combination of ILs and biomass-derived CQDs for the rapid/sensitive detection of metal ions in environmental waters.
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