Surfaces and Interfaces
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2023
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IF 6.2
Yijun Wang,Meijuan Ding,Ziyu Li,Mei Li
To facilitate the realize high-value utilization of coal tar pitch, carbon quantum dots (CQDs) were synthesized using ball-milling-assisted H₂O₂ oxidation method with tar pitch as carbon source. Subsequently, Ag₃PO₄/g-C₃N₄/CQDs composites were prepared through the electrostatic self-attraction of CQDs, Ag₃PO₄ and g-C₃N₄. These composites were then employed for the photocatalytic degradation of dyes, including methyl orange (MO), methylene blue (MB) and rhodamine B (RhB). A case study of MO, the degradation rate constant of Ag₃PO₄/g-C₃N₄/CQDs reached 0.02469 min −1 , which was 11 times and 1.6 times higher than that of g-C₃N₄ and Ag₃PO₄. It found that Ag₃PO₄:g-C₃N₄ mass ratio of 1:1 and 5 mg/L CQDs solution loading were optimal. Characterization analysis revealed the specific surface area of the catalyst was increased and optimized band gap structure after the combination of CQDs as the co-catalyst. The possible reaction mechanism was also expounded, Ag₃PO₄/g-C₃N₄/CQDs constructed Z-scheme heterostructure, with CQDs as electron bridge. In addition, the impact of catalyst mass, initial concentration, and pH on the degradation process was studied, as well as the cyclic stability of the catalyst. Based on capture and ESR tests, the main active substances involved in the reaction were in the following order: h + > ·OH > ·O 2 − . These experiments provided a new idea on the application of coal-based CQDs in the field of visible light catalytic degradation.
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Polymers
·
2023
·Vol. 15
·期 18
·3654
·
IF 5
Yanghui Song,Guanglei Zhao,Sihan Zhang,Chong Xie,Xiaofeng Li
With the development of portable devices and wearable devices, there is a higher demand for high-energy density and light lithium-ion batteries (LIBs). The separator is a significant component directly affecting the performance of LIBs. In this paper, a thin and porous chitosan nanofiber separator was successfully fabricated using the simple ethanol displacement method. The thickness of the CME15 separator was about half that of mainstream commercial Celgard2325 separators. Owing to its inherent polarity and high porosity, the obtained CME15 separator achieved a small contact angle (18°) and excellent electrolyte wettability (324% uptake). The CME15 separator could maintain excellent thermal dimensional stability at 160 °C. Furthermore, the CME15 separator-based LIBs exhibited excellent cycling performance after 100 cycles (117 mAh g−1at 1 C). The present work offers a perspective on applying a chitosan nanofiber separator in light and high-performance lithium-ion batteries (LIBs).Keywords:chitosan;nanofiber;separator;lithium-ion battery;nano-porous structure
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Small Methods
·
2023
·
IF 12.4
Jiaxing Zhu,Jinghui Li,Yuanlong Huang,Nian Liu,Liang Sun,Zixi Shen,Chaoqun Yang,Fanxin Liu,Boxiang Song,Jiajun Luo,Jiang Tang
With the rapid progress of perovskite light-emitting diodes (PeLEDs), the large-scale fabrication of active matrix PeLED displays (AM-PeLEDs) is gaining increasing attention. However, the integration of high-resolution PeLED arrays with thin-film transistor backplanes remains a significant challenge for conventional spin-coating techniques. Here, the demonstration of large-area, blue-emitting AM-PeLEDs are demonstrated using a vacuum deposition technique, which is regarded as the most effective route for organic light-emitting diode displays. By the introduction of an in situ passivation strategy, the defects-related nonradiative recombination is largely suppressed, which leads to an improved photoluminescence quantum yield of vapor-deposited blue-emitting perovskites. The as-prepared blue PeLEDs exhibit a peak external quantum efficiency of 2.47% with pure-blue emission at 475 nm, which represents state-of-the-art performance for vapor-deposited pure-blue PeLEDs. Benefiting from the excellent uniformity and compatibility of thermal evaporation, the 6.67-inch blue-emitting AM-PeLED display with a high resolution of 394 pixels per inch is successfully demonstrated. The demonstration of blue-emitting AM-PeLED display represents a crucial step toward full-color perovskite display technology.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Liang Wei,Shuqi Chen,Xiande Yang,Hongxi Zhang,Zimei Mo,Jing Yang,Haibo Wang
Aflatoxin B1 (AFB1) is a dangerous toxin found in food and feed, it is of great significance to find a photocatalyst for the efficient degradation of AFB1. Bismuth molybdate (Bi 2 MoO 6 ) photocatalyst has advantages of good visible light response, low cost, and non-toxicity. In this study, the solvent composition polarity and different temperatures were discussed on the surface nano-sheets aggregation, crystal size, and crystal defect of Bi 2 MoO 6 . The photocatalytic performance of Bi 2 MoO 6 was investigated towards AFB1 degradation under visible light. The results showed that sample BMO(3:7)-160 prepared under a volume ratio of 3:7 about ethylene glycol to ethanol and 160℃ was spherical structure composed of nanosheets, which had a good photocatalytic degradation efficiency and photocatalytic stability on AFB1. After 120 min, the degradation rate of AFB1 can reach 99.8 %, which was attributed to the best electron-hole separation efficiency of BMO(3:7)-160. In addition, h + was identified as the primary active species. The degradation products of AFB1 were analyzed to deduce the pathway of AFB1 decomposition and the possible photocatalytic mechanism.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Chen Liang,Jingjing Cui,Yongding Sun,Zhe Lu,Fukang Liu,Shiwei Feng,Guang Hu,Jin Cui,Biao Zhang
Digital light processing (DLP)-based 3D printing of hydrogels with sophisticated structures has been widely used in myriads of fields. However, the inherent covalently crosslinked network of hydrogels limits their further applications, such as working as sacrificial molds. In this work, a photocurable hydrogel system with labile covalent bonds suitable for DLP based printing to fabricate 3D complex hydrogel structures with fast- and controlled degradation ability is reported. The hydrogel precursor is composed of polyethylene glycol 400 (PEG400), a water soluble photoinitiator, and PEGDA575-Do, a degradable photocurable diacrylate monomer that can be degraded in aqueous condition via reversable aza-Michael addition reaction. The mechanical properties of formed hydrogels can be regulated by changing the PEG content and water content, and the degradation rate can be regulated by changing parameters such as PEG400 content, water content and the treating temperature. Moreover, the DLP printed degradable hydrogels networks can be used as sacrificial molds to fabricate structures from materials that cannot be directly used for DLP 3D printing (e.g. thermoplastic polycaprolactone (PCL), epoxy-based resin, and chocolate). As proofs-of-concept, a microfluidic chip is fabricated by using the biocompatible 3D printed hydrogel as a sacrificial template. Similarly, a flexible RFID tag and a flexible self-powered device are also prepared, demonstrating the potential applications in the field of flexible electronics.
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Nanoscale
·
2023
·Vol. 15
·期 34
·14165-14174
·
IF 6.7
Hai Huang,Yu Zhao,Haowei Yang,Jie Li,Yulong Ying,Jinhua Li,Sheng Wang
Three-dimensional motion (especially in the Z-axis direction) of metal–organic frameworks (MOFs)-based micromotors (MOFtors) is essential but still in its infancy. Herein, we propose a simple strategy for designing light-driven MOFtors that move in the Z-axis direction and efficiently kill Staphylococcus aureus (S. aureus). The as-prepared polypyrrole nanoparticles (PPy NPs) with excellent photothermal properties are combined with ZIF-8 through a simple in situ encapsulation method, resulting in multi-wavelength photothermally-responsive MOFtors (PPy/ZIF-8). Under the irradiation of near-infrared (NIR)/ultraviolet (UV)/blue light, the MOFtors all exhibited negative phototaxis and high-speed motion behaviour with the highest speed of 2215 ± 338 μm s−1. In addition, it is proved that these MOFtors can slowly self-float up in an aqueous environment. The light irradiation will accelerate the upward movement of the MOFtors, and the time required for the MOFtors to move to the top is negatively correlated with the light intensity. Finally, efficient antibacterial performances (up to 98.89% against S. aureus) are achieved with these light-driven MOFtors owing to the boosted Zn2+ release by vigorous stirring motion and physical entrapment by the upward motion under light irradiation.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chen Zhang,Zeyu Wang,Minqiang Wang,Jindou Shi,Junnan Wang,Zheyuan Da,Yun Zhou,Youlong Xu,Nikolai V. Gaponenko,Arshad Saleem Bhatti
Although cesium halide lead (CsPbX3, X = Cl, Br, I) perovskite quantum dots (QDs) have excellent photovoltaic properties, their unstable characteristics are major limitations to application. Previous research has demonstrated that the core–shell structure can significantly improve the stability of CsPbX3 QDs and form heterojunctions at interfaces, enabling multifunctionalization of perovskite materials. In this article, we propose a convenient method to construct core–shell-structured perovskite materials, in which CsPbBr3@CsPb2Br5 core–shell micrometer crystals can be prepared by controlling the ratio of Cs+/Pb2+ in the precursor and the reaction time. The materials exhibited enhanced optical properties and stability that provided for further postprocessing. Subsequently, CsPbBr3@CsPb2Br5@TiO2 composites were obtained by coating a layer of dense TiO2 nanoparticles on the surfaces of micrometer crystals through hydrolysis of titanium precursors. According to density functional theory (DFT) calculations and experimental results, the presence of surface TiO2 promoted delocalization of photogenerated electrons and holes, enabling the CsPbBr3@CsPb2Br5@TiO2 composites to exhibit excellent performance in the field of photocatalysis. In addition, due to passivation of surface defects by CsPb2Br5 and TiO2 shells, the luminous intensity of white light-emitting diodes prepared with the materials only decayed by 2%–3% at high temperatures (>100 °C) when working for 24 h.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xueguo Li,Hao Liang,Changbo Zheng,Chunxiang Zhao,Songchao Bai,Xueqing Zhao,Hao Zhang,Yongsheng Zhu
Lead-free halide double perovskites are widely used for phosphors converted light emitting diode (pc-LED) devices. However, it remains a challenge to modulate their spectra to meet different application requirements. Herein, Cs 2 NaInCl 6 :Sb 3+ double perovskite crystals with excellent blue emission of self-trapped excitons (STEs) were prepared and a lanthanide ions (Ln 3+ ) doping strategy was employed to enable multicolor emissions in this system. The emission colors can be continuously adjusted in a wide range by altering the Ln 3+ ions doping levels. Especially, white light emissions with tunable correlated color temperature were obtained in Tb 3+ , Ho 3+ ions codoped samples. Outstanding photoluminescence quantum yields of the samples are ascribed to the sensitization effect of Sb 3+ ions and the efficient energy-transfer from STEs to Ln 3+ ions. LED devices were further fabricated to demonstrate the great application potentials of the prepared phosphors. These findings provide deep insights for the designing of multicolor double perovskite phosphors.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jiahao He,Wenlu Zhang,Wenbin Li,Chong He
Herein, a pohotosentive polysiloxane (PSO)/talc/Al 2 O 3 slurry was prepared for the digital light processing printing. Liquid photosensitive PSO was exploited as a triple-functioned material, acting both as the resin matrix, a high reactive Si source and a pore generator. Through adjusting the raw material components, polysiloxane can be sintered with talc and Al 2 O 3 fillers after being pyrolyzed to 1200 o C while pores with variable diameters can be generated. Ternary component slurry prepared based on the above strategy possesses the characteristics of low viscosity, high reaction activity and good homogeneity. Sintering schedule of the printed thin-walled precursor was investigated to guarantee the morphology of cordierite product was consistent with the printed model. This work aims to provide a new strategy for DLP printing of MgO-Al 2 O 3 -SiO 2 ternary and other polymer derived ceramics.
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Laser & Photonics Reviews
·
2023
·Vol. 18
·期 3
·2300608
·
IF 11
Ruiyang Li,Yongfu Liu,Chen Jin,Liangliang Zhang,Jiahua Zhang,Xiao-Jun Wang,Guoxin Chen,Jun Jiang
Near-infrared (NIR) phosphor-converted (pc) light-emitting diodes (LEDs) are gaining popularity as smart NIR spectroscopy light sources. However, the low wall-plug efficiency (WPE) of NIR pc-LEDs has limited their applications due to the comprehensive properties of external quantum efficiencies (EQEs) and thermal stability for NIR phosphors. In this study, a simple strategy is presented to achieve high-performance NIR phosphors by breaking the d–d parity forbidden transitions of Cr 3+ in the garnet host by introducing asymmetric vibrations via lattice distortions. The achieved EQE is as high as 44% at room temperature and maintains >98% of the initial EQE at 150 °C, demonstrating excellent thermal stability. Notably, these NIR phosphors enable unprecedented NIR pc-LEDs with a record WPE of 26% driven at 100 mA. Consequently, the application of NIR pc-LEDs is expanded to new areas such as real-time heart rate monitoring and fingerprint recognition.
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LANGMUIR
·
2023
·
IF 3.9
Wenhao Yang,Wangyi Zeng,Liang Chai,Yanxin Jiang,Longjiang Deng,Guang Yang
Corrosion resistant, durable, and lightweight flexible strain sensor with multiple functionalities is an urgent demand for modern flexible wearable devices. However, currently developed wearable devices are still limited by poor environmental adaptability and functional singleness. In this work, a conductive fabric with multifunctionality in addition to sensing was successfully prepared by assembling zero dimensional silver nanoparticles (AgNPs) and one-dimensional carbon nanotubes (CNTs) layer by layer on the surface of the elastic polypropylene nonwoven fabric (named PACS fabric). Polystyrene-block-poly(ethylene-co-butylene)-block-polystyrene (SEBS) added as binder materials favored strong interaction between conductive fillers and the fabric. Benefiting from the synergistic interaction among the conductive fillers with different dimensions and the fabric, the strain sensor based on the conductive fabric showed high sensitivity (GF up to 8064), wide detection range (0–200%), and excellent stability and durability (more than 10000 stretch–release cycles). Besides, the prepared conductive fabric showed superhydrophobicity (water contact angle = 154°) with excellent durability. This ensured the performance stability of the fabric sensor in harsh environments. At the same time, the fabric also showed excellent photothermal conversion performance (90 °C at a power density of 0.2 W/cm2 within 20 s). The PACS fabric strain sensor proved excellent performance and environmental adaptability, revealing great potential to be applied in human motion monitoring, self-cleaning, biomedicine, and other fields.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Shujuan Yang,Wenqi Qin,Xinyu Zhao,Furui He,Haifang Liu,Qichang Zhou,Junhao Huang,Gaobo Yu,Yuhong Feng,Jiacheng Li
The soft interfacial template-assisted confined self-assembly of block copolymers (BCPs) guiding colloidal aggregates has been extensively investigated by interfacial instability. Whether the macromolecular polymer architectonics possessed stimulus-responsive self-regulated structural controllability more readily implement the morphological diversity of colloidal aggregates. Herein, we in-situ constructed the alginate-modified β-cyclodextrin/azobenzene-functionalized alkyl chains (Alg-β-CD/AzoC12) system by supramolecular host–guest interfacial recognition-engineered strategy, in which possessed photo-stimulated responsive structural reconfigurability by modulating assembly/disassembly behaviors between CD and Azo at oil/water interface. The host–guest droplet interfaces acted as soft templates managing interfacial instability by synergistically integrating supra-amphiphilic host–guest polymers with cosurfactants, further constructing various soft supracolloidal aggregates, including soft nanoaggregates, microspheres with tunable degrees of surface roughness. Additionally, the stimuli-altering structural reconfigurability of supramolecular host–guest polymers was regulated by ultraviolet/visible irradiation, endowing soft aggregates with structural diversity. It’s highly anticipated that the supramolecular host–guest interfacial recognition self-assembly establishes great bridge between supramolecular host–guest chemistry and colloid interface science.
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