JOURNAL OF FLUORESCENCE
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2022
·Vol. 32
·期 5
·1621-1627
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IF 2.525
Cui Huahua,Wu Shanshan,Wang Lei,Sun Xiangzhong,Zhang He,Deng Mengyu,Tian Yanqing
In this study, we aimed to synthesize magnetically well-dispersed nanosensors for detecting dissolved oxygen (DO) in water, and explore their biological applications. Firstly, we synthesized two kinds of magnetic nanoparticle with average sizes of approximately 82 nm by one-step emulsion polymerization: polystyrene magnetic nanoparticles (Fe 3 O 4 @Os1-PS) and polymethylmethacrylate magnetic nanoparticles (Fe 3 O 4 @Os1-PMMA). Both types of nanoparticle present good dispersibility and fluorescence stability. The nanoparticles could be used as oxygen sensors that exhibited a high DO-sensitivity response in the range 0-39.30 mg/L, with a strong linear relationship. The nanoparticles have good magnetic properties, and so they could be recycled by magnet for further use. Recovered Fe 3 O 4 @Os1-PS still presented high stability after continued use in oxygen sensing for one month. Furthermore, Fe 3 O 4 @Os1-PS was employed for detecting the bacterial oxygen consumption of Escherichia coli (E-coli) to monitor the metabolism of bacteria. The results show that Fe 3 O 4 @Os1-PS provide high biocompatibility and non-toxicity. Polystyrene magnetic nanoparticles therefore present significant potential for application in biological oxygen sensing.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Lan Ding,Fenghua Bai,Burenbayaer Borjigin,Yuning Li,Huiqin Li,Xiaojing Wang
Solar-energy-driven CO 2 conversion into valuable chemical fuels holds great renewable potential. However, most photocatalysts' weak CO 2 adsorption limits more artificial photosynthesis for further utilization. Herein, we present an in situ assembling approach to produce stable Cs 2 AgBiBr 6 /Ce-UiO-66-H composite, in which a tight contact interface between the two participated components was constructed. Benefiting from the photocatalytic properties and high adsorption capacity for CO 2 , the optimized 20Cs 2 AgBiBr 6 /Ce-UiO-66-H adsorption-photocatalyst exhibits outstanding performance for reductive CO 2 deoxygenation with considerable CO generation rate (309.01 μmol g −1 h −1 ) under simulated solar light irradiation with 300 W Xe lamp, which is about 2.1 and 2.7 times than that of pure Cs 2 AgBiBr 6 and Ce-UiO-66-H, respectively. The excellent catalytic conversion of CO 2 is ascribed to the effective solar harvest and quickly photo-excited carriers’ separation in such assembled architecture. Importantly, due to the in-situ synthesis, Cs 2 AgBiBr 6 QDs are intercalated in the Ce-UiO-66-H frameworks and it could lead to improved stability and induce abundant oxygen vacancies in Cs 2 AgBiBr 6 /Ce-UiO-66-H, which can maintain unchangeable CO 2 conversion rate under wet air with consecutive ten hours of the recycling test. In this work, the combining metal–organic frameworks and lead-free halide perovskite provide great potential for artificial photocatalytic CO 2 -to-CO conversion under a mild gas–solid reaction condition via utilizing solar energy.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Hongwei Ding,Jingjing Yang,Rui Liu,Yan Li,Xueliang Liu,Xiangyue Wang,Lin Jin
Driven by clean solar energy, photocatalytic technology can effectively degrade organic pollutants and kills pathogenic bacteria. Researchers are always devoted to developing more economical and efficient photocatalysts. In this work, mesoporous TiO 2 nanoparticles (MTN) with controlled diameters (100–200 nm) and large specific surface areas (∼112 m 2 /g) were prepared via a simple sol–gel method. Then, 10 wt% Ag nanocrystals (∼5 nm) were in situ generated in the MTN via solvothermal process, Ti 3+ and oxygen vacancies also been introduced on their surface, thereby leading to a narrowed bandgap (∼2.9 eV) and strong absorption in the visible region. Finally, polydopamine (PDA) was decorated on the surface of Ag/bMTN to further improve their dispersity and photocatalytic activity. The degradation rate of tetracycline and the bactericide rate of E. coli could surpass 90 % and 99 %, which were mainly attributed to the generated O 2 − and the released Ag ions.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiaobo Hu,Yanqiao Xu,Jiancheng Wang,Jiaxin Ma,Lianjun Wang,Wan Jiang
CsPbX 3 (X = Cl, Br, I) perovskite nanocrystals (NCs) are emerging as promising candidates for fluorescence sensors due to their superior optoelectronic properties. However, the poor stability restricts their practical applications in aqueous fluorescent detection. Herein, we report in-situ encapsulation of CsPbX 3 NCs into uniform PVDF-HFP/PS polymer nanofibers with fine diameter of only 49.9 ± 2.2 nm by one-step electrospinning process. The as-fabricated CsPbX 3 @PVDF-HFP/PS nanofibers exhibit high photoluminescence quantum yield (PLQY) of 90%, tunable emission wavelength covering the whole visible range of 451.5–650.8 nm. Most importantly, the water stability of nanofiber membranes can be significantly improved by introducing the 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (PFDTMS) as hydrophobic additives, in which their PL intensity can retain 88% initial value after water immersion for up to 100 days. The universality of this fabrication strategy for the stable nanofibers is demonstrated by utilizing different types of polymers and perfluorosilanes (PFSs). Taking advantage of excellent optical properties, fine diameter and high hydrophobicity of PFDTMS-modified CsPbBr 3 @PVDF-HFP/PS nanofibers, the detection for rhodamine 6G (R6G) and rhodamine B (RhB) in aqueous solution with maximum fluorescence resonance energy transfer (FRET) efficiency up to 80.9% and 69.7% are realized, respectively. Notably, these electrospun nanofiber membranes possess outstanding durability and recyclability, indicating their great potential in multifunctional photoelectric applications.
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Nanoscale
·
2022
·Vol. 14
·期 37
·13779-13789
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IF 8.307
Yanqiao Xu,Xiaobo Hu,Haijie Chen,Huidong Tang,Qing Hu,Ting Chen,Weihui Jiang,Lianjun Wang,Wan Jiang
A great hurdle restricting the optoelectronic applications of cesium lead halide perovskite (CsPbX3) nanocrystals (NCs) is due to the uncoordinated lead atoms (Pb0) on the surface, where most attempts to address the challenges in the literature depend on complicated post-treatment processes. Here we report a simple in situ surface engineering strategy to obtain highly fluorescent and stable perovskite NCs, wherein the introduction of the multifunctional additive 1-butyl-3-methyl-imidazolium tetrafluoroborate ([Bmim]BF4) can significantly eliminate the Pb0 traps. The photoluminescence quantum yield (PLQY) of the as-synthesized NCs was improved from 63.82% to 94.63% due to the good passivation of the surface defects. We also confirm the universality of this in situ passivation pathway to remove Pb0 deep traps by using fluoride acid-based ionic liquids (ILs). Due to the high hydrophobicity of the cations of ILs, the as-prepared CsPbBr3 NCs exhibit robust water resistance stability, maintaining 67.5% of the initial photoluminescence (PL) intensity after immersion in water for 21 days. A white light emitting diode (LED), assembled by mixing the as-synthesized CsPbBr3 NCs and red K2SiF6:Mn4+ phosphors onto a blue chip, exhibits high luminous efficiency (100.07 lm W−1) and wide color gamut (140.64% of the National Television System Committee (NTSC) standard). This work provides a promising and facile technique to eliminate the Pb0 traps and improve the optical performance and stability of halide perovskite NCs, facilitating their applications in optoelectronic fields.
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CRYSTENGCOMM
·
2022
·Vol. 24
·期 38
·6777-6785
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IF 3.756
Ling Li,Hao Dong,Yongfei Hu,Tao Zeng,Yunxia Chen,Kwadwo Mensah-Darkwa,Emmanuel Tsiwah Acheampong,Ghafar Ali,Yi Xie
Although lead halide perovskite (LHP) nanocrystals (NCs) are considered propitious materials due to their extraordinary optoelectronic properties, the scalability of synthesis and poor ambient stability hinder their commercial applications. Herein, we develop a facile and universal room-temperature (RT) protocol for the synthesis of red-emitting all-inorganic CsPbBr3−xIx perovskite NCs by the mediation of capping ligands. The emission wavelength can be tuned in the range of 598–651 nm by tailoring the PbBr2 : PbI2 precursor ratios and the amounts of ligands. Interestingly, the introduction of ligands such as 3-mercaptopropionic acid (MPA) and thioglycolic acid (TGA) heavily improves the stability of the as-synthesized NCs against water, heat stress and UV irradiation, which is due to surface passivation. This work offers a reliable and scalable reference for tuning red-emissive perovskite NCs with improved environmental stability, which will accelerate their commercial application process in optoelectronic fields.
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Frontiers in Chemistry
·
2022
·
IF 5.545
Qian Ningkang,Ji Liang,Li Xiao,Huang Jingbo,Li Junjie,Wu Xingqiao,Yang Deren,Zhang Hui
Combining the core-shell structure with the optimization of surface composition and structure in the shell is a fantastic strategy to enhance the electrocatalytic performances. Here, we synthesized trimetallic Au@PtxSny core-shell nanoparticles (NPs) with tunable composition and structure of Pt-Sn alloyed shells. Impressively, the Au@PtSn core-shell NPs with hexagonal PtSn alloyed shells exhibited the highest mass activity and specific activity toward ethanol oxidation reaction (EOR) in alkaline electrolyte, which are 13.0 and 12.7 times higher than those of the commercial Pt/C. In addition, the Au@PtSn core-shell NPs displayed the best stability compared to commercial Pt/C, with only 44.8% loss vs. 86.8% loss in mass activity after 1,000 s due to the stronger anti-poisoning ability for reaction intermediates. The theory calculations reveal that the introduction of Au core and alloying Pt with Sn both endow Pt with an appropriate d-band center, and thus effectively boosting the EOR activity.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 24
·19019-19025
·
IF 2.779
Duan Weijia,Hu Lei,Zhao Weiren,Zhang Xiaoli
Rare-earth Nd 3+ ions were doped into CsPbBr 3 perovskite quantum dots (QDs) by solution-processed method at room temperature. By controlling different doping ratios, all-inorganic perovskite QDs with mixed-cations were obtained. The introduction of rare-earth ions into perovskite QDs has little influence on morphology evolution, with cubic shape for all samples. Spectra tuning can be realized by controlling rare-earth ion doping in perovskite QDs. The PL peak was blue-shifted from 515 to 500 nm, while full width at half maximum (FWHM) changes slightly. The results are mainly due to the smaller Nd ion radius than the Pb ion radius, resulting in the decrease of lattice constant and increase of band gap width. The performance of light-emitting diodes (LEDs) based on Nd 3+ -doped CsPbBr 3 QDs have been explored, which indicates inferior activity with extra Nd 3+ doping. The impurities and foreign phase induced by rare-ion doping, may increase halogen vacancies ( V Br ) in the products, which could act as quenching centers, resulting in nonradiative energy transfer to the trap states, and then the inferior performance of perovskite LEDs.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 31
·18860-18867
·
IF 3.945
Yalei Gao,Tao Zhang,Jun Liu,Hongjun Liu,Meixian Li,Fuchi Liu,Wenjie Kong,Fengzhen Lv,Yong Yang,Lizhen Long
Perovskite materials are prominent candidates for many high-performance optoelectronic devices. The rare-earth lead-free CsEuCl3 perovskite nanocrystals are extremely unstable, which makes it very difficult to study their physicochemical properties and applications. Herein, we improved the stability of rare-earth based CsEuCl3 nanocrystals by employing a silica-coating for the first time. Simultaneously, the naturally formed “hollow” regions with an obviously blue-shifted PL emission were first observed inside the CsEuCl3 nanocrystals during the period of storage. Density functional theory (DFT) calculations showed that the formed “hollow” regions are due to the internal defect evolution in the perovskite lattice, which is also responsible for the increase of the bandgap and the blue-shift of emission. Additionally, the rapid decline of luminescence is probably due to the nanocrystals’ final cracking with the expansion of the “hollow” regions. This work helps to understand the relationship between defects and luminescence properties, and provides guidance for the design of more stable lead-free perovskite nanocrystals.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Longshi Rao,Qing Zhang,Bin Sun,Mingfu Wen,Jiayang Zhang,Shudong Yu,Ting Fu,Xiaodong Niu
Cesium lead halide perovskite crystals have attracted widespread attention due to their excellent photoelectric properties. However, their intrinsic instability and the photoluminescence quantum yield (PLQY) sharply dropped in the solid-state limit their practical applications. Besides, the current synthesis strategies either need a variety of ligands, or an anti-solvent, which will result in potential environmental risks. Herein, we address the above issues simultaneously by embedding CsPbBr 3 in a large bandgap Cs 4 PbBr 6 matrix by high-speed mechanical mixing without using any ligands and highly toxic anti-solvent. Changing the molar ratio of PbBr 2 /CsBr, centrifugation time, and the solution concentration, the optimized CsPbBr 3 /Cs 4 PbBr 6 show a high PLQY of up to 79%. In addition, mechanistic studies show that the origin of green luminesce of CsPbBr 3 /Cs 4 PbBr 6 microcrystals is closely related to the CsPbBr 3 inclusion theory, but not to the Br vacancy theory, in which CsPbBr 3 embedded in Cs 4 PbBr 6 to form a CsPbBr 3 /Cs 4 PbBr 6 heterostructure . By taking advantage of the heterostructure, the photostability and thermostability of CsPbBr 3 /Cs 4 PbBr 6 are significantly enhanced. In addition, the high optical and temperature/humidity-stable performances of CsPbBr 3 /Cs 4 PbBr 6 are verified by applying them to white LEDs (WLEDs). The electroluminescence intensity of WLEDs remains 70% of the original one after being stored in a chamber with high temperature and high humidity (85 °C/RH 85%) for 40 h, and the device displays luminous efficiency of 74.5 lm/W at 20 mA. This result provides a solid foundation for their scale applications in lighting, displays, and other optoelectronic and photonic devices.
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Bioactive Materials
·
2022
·
IF 16.874
Puxiang Zhao,Yue Feng,Youquan Zhou,Cuiying Tan,Mingxian Liu
Infection and healing of wounds after injury has always been an unavoidable problem in daily life, so design of a biomaterial with antibacterial and good wound healing properties is highly needed. Herein, a wound healing hydrogel dressing with halloysite clay and chitin as the main components was prepared, which combines the advantages of the biomacromolecule and clay. Halloysite nanotubes (HNTs) are extremely biocompatible clay materials with a hollow tubular structure, and the inner and outer surfaces of HNTs are composed of SiOx and AlOx layers with different charges. Au nanoparticles with diameter in 5–10 nm were filled into the HNTs' lumen to endow photothermal effect of the clay materials. [email protected] was then mixed with chitin solution to prepare flexible composite hydrogel by crosslinking by epichlorohydrin. The antibacterial properties, biocompatibility and hemostatic properties of the hydrogel material were investigated by antibacterial experiments, cell experiments, mouse liver and tail hemostatic experiments. After infecting the back wound of mice with Staphylococcus aureus, the hydrogel was applied to the wound to further verify the killing effect on bacteria and wound healing effect of the hydrogel material in vivo. The [email protected] composite hydrogel exhibits high antibacterial and hemostatic activity as well as promoting wound healing function with low cytotoxicity. This study is significant for the development of high-performance wound dressings based on two commonly used biocompatible materials, which shows promising application in wound sterilization and healing.
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JOURNAL OF MATERIALS RESEARCH
·
2022
·Vol. 37
·期 19
·3308-3317
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IF 2.909
Wu Meng,Li Qifei,Cheng Siling,Yao Kaitong,Liu Lin,Jiang Yu,Feng Yuezhan,Rui Xianhong,Yu Yan
Sodium-ion batteries (SIBs) are considered as potential substitute in large-scale energy storage systems due to the abundant natural resources and low price of sodium, and environmental friendliness. However, commercial graphite anode in lithium-ion batteries cannot be directly applied to SIBs. Bimetallic selenides stand out among the many anode materials owing to their rich redox chemistry and superior conductivities. Here, a bimetallic selenide Cu 3 VSe 4 is successfully prepared via one-pot reaction in oil phase, and its energy storage performance for SIBs is investigated. It delivers an impressive capacity, excellent rate performance (298 mAh g −1 at 10 A g −1 ), and outstanding long-term cycling life (305 mAh g −1 over 1000 cycles at 2.0 A g −1 ). In addition, the Na + storage mechanism (including intercalation and conversion reactions) is revealed. This work provides a new way for the application of the Cu 3 VSe 4 in SIBs. Graphical abstract A bimetallic selenide Cu 3 VSe 4 is successfully prepared via one-pot reaction in oil phase. When it is evaluated as the anode for sodium-ion batteries, the Cu 3 VSe 4 displays an impressive capacity, excellent rate performance, and outstanding long-term cycling life. In addition, the Na + storage mechanism (including intercalation and conversion reactions) is revealed.
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