INORGANIC CHEMISTRY COMMUNICATIONS
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2024
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IF 4.4
Yuhan Xie,Ke Zhang,Boyu Dong,Ranran Xu,Jinxi Chen,Yongbing Lou
A well-designed composite based on semiconductor materials can effectively reduce the recombination of photo-generated carriers in photocatalysts by establishing efficient charge transfer channels, which enhances the activity of photocatalytic hydrogen evolution for water splitting. Herein, a ZnIn 2 S 4 /NiSe 2 composite with NiSe 2 nanoparticles tightly anchored on the nanosheets-assembled microspheres ZnIn 2 S 4 was elaborated and successfully synthesized by a hot-injection method followed by a successive solvothermal method. The synergistic effects and close contact interface between ZnIn 2 S 4 and NiSe 2 facilitated charge migration. Under visible light irradiation, the optimal ratio of ZnIn 2 S 4 /NiSe 2 composite achieved an outstanding hydrogen evolution rate of 3060 µmol g −1 h −1 (nearly 12.6 times of unmodified ZnIn 2 S 4 ) and exhibited superior stability (no apparent decrease within 20 h) in the presence of a sacrificial agent (triethanolamine). Additionally, various characterizations revealed that the recombination of photo-generated carriers was effectively suppressed, visible-light absorption was significantly enhanced, and interface charge transfer was accelerated, thus endowing the ZnIn 2 S 4 /NiSe 2 composite with superior photocatalytic activity . This research provides illuminating insights into using the non-noble metal-based catalyst NiSe 2 as an effective co-catalyst, significantly improving photocatalytic performance and holding great potential in alleviating energy shortages and environmental pollution problems.
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高影响因子
ChemCatChem
·
2024
·
IF 3.8
Qichao Lu,Changxiao Li,Jie Li,Qiong Tang,Lei Liu,Jinxiang Dong
Graphical ZnFe 2 O 4 spinel with various morphologies for FTS : Compared to octahedral ZnFe 2 O 4 spinel, the cubic ZnFe 2 O 4 spinel was more prone to the formation of Fe 5 C 2 phase under syngas atmosphere and exhibited higher catalytic activity and light olefins selectivity. The shape-defined ZnFe 2 O 4 spinel with cubic and octahedral morphology was hydrothermally synthesized, respectively, and used as catalyst precursor for Fischer–Tropsch synthesis (FTS). The structure of ZnFe 2 O 4 spinel was changed to ZnO and Fe 5 C 2 (Fe 5 C 2 /ZnO) after reduction and carbonization. Interestingly, ZnFe 2 O 4 with cubic morphology exhibited much higher catalytic activity and selectivity toward low-carbon olefins (C 2 –C 4 ) than the octahedral one under identical conditions, and the latter tended to produce the saturated alkanes. The primary properties of ZnFe 2 O 4 materials before and after reduction were systematically studied through a series of characteristic technologies to reveal the difference in catalytic performance between the two ZnFe 2 O 4 spinels with different morphologies.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Ming Yang,Lang Chu,Yanfeng Zhuang,Cheng Qi,Si Meng,Zhou Liu,Tiantian Kong
The challenges of replicating the complex mechanical and structural diversity of natural tissues in vitro by leveraging multi-material digital light processing (DLP) bioprinting are addressed. This technique utilizes PEGDA-AAm bio-ink to develop multi-component, cell-laden hydrogel constructs with varying moduli. These constructs not only possess heterogeneous mechanical properties but also feature complex architectures and precisely engineered surface microstructures. The hydrogel microfluidic chips are successfully fabricated with perfusable microchannels, embedding various cell types within the matrix. This approach enables the bioprinting of intricate cell-laden structures with unique surface topologies, such as spiral grooves and triply periodic minimal surfaces (TPMS), which effectively influence cell alignment, spreading, and migration. By integrating various cell-laden PA hydrogels, the diverse mechanical moduli of biological tissues, including bone, liver lobules, and vascular networks are replicated. This technique ensures high-fidelity differentiation between cell types and regions. These findings provide valuable insights into the impact of substrate modulus and structure on cell behavior, underscoring the potential of multi-component, multi-modulus hydrogel constructs in creating sophisticated structures with custom-tailored mechanical properties. This study significantly advances the field by demonstrating the feasibility and effectiveness of multi-material DLP bioprinting in developing complex, functionally relevant tissue models for tissue engineering and regenerative medicine.
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高影响因子
MATERIALS & DESIGN
·
2018
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IF 4.525
Tianyu Fang,Liangliang Cao,Shunping Chen,Jiaojiao Fang,Jia Zhou,Liang Fang,Chunhua Lu,Zhongzi Xu
Five photoresponsive polymers towards ultraviolet (UV), visible, and near-infrared (NIR) light were prepared and assembled to achieve complicated light-induced shape deformation. The UV light responsive polymer was contributed by a synthesized linear polyurethane elastomer (azo-PU) containing azobenzene groups in the main chains, which presented both shape-memory effect and UV light-induced shape deformation behavior . The other four polymers that were sensitive to visible or NIR light consisted of crosslinked poly(ethylene-co-vinyl acetate) (EVA) composites mixing with gold nanoparticles (AuNPs), Nd(TTA) 3 Phen, Yb(TTA) 3 Phen, and Sm(TTA) 3 Phen as photothermal fillers, respectively. The results showed that the shape recoveries of these EVA composites were triggered merely by visible and/or NIR light with suitable wavelengths. Moreover, the assembly of the prepared five light-induced polymers in three different manners improved the spatiotemporal control of complicated shape deformations upon different light illumination sequences. Benefiting from the creation and assembly of five photoresponsive polymers with high wavelength selectivities, complex shapes of polymer specimens can be achieved in a remote and non-contact manner via simply tuning irradiation sequences. The reported materials here and their assembly manners provide a strategy to expand the applications of photoresponsive polymers.
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高影响因子
ChemCatChem
·
2017
·Vol. 10
·期 6
·1330-1335
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IF 4.803
Yanting Gao,Feng Hou,Shan Hu,Baogang Wu,Ying Wang,Haiqiu Zhang,Baojiang Jiang,Honggang Fu
Graphical GQD modification : Graphene quantum dots (GQDs) were modified on hexagonal tubular carbon nitride to form a composite photocatalyst by freeze-drying technology. The hydrogen evolution rate of P-TCN/GQDs-0.15 is 112.1 μmol h −1 ( λ >420 nm), which is about nine times higher than that of bulk carbon nitride. Graphene quantum dots were modified on hexagonal tubular carbon nitride to form a composite photocatalyst by freeze-drying technology. With an optimum loading amount of 0.15 wt % GQDs, the composite photocatalyst exhibits an improved visible-light photocatalytic performance for hydrogen evolution (112.1 μmol h −1 ) that is about 9 times higher than that of bulk carbon nitride. During the photocatalytic reaction, graphene quantum dots play a photosensitizer role and an electron reservoir, which can extend the visible-light response of the photocatalyst, decrease its band gap, and improve the separation efficiency of photoinduced electron–hole pairs. The graphene quantum dots can also absorb the long-wavelength light and then emit the shorter wavelength light based on its upper transfer luminescence properties, which also contribute to the utilization of visible light. This finding demonstrates that the graphene quantum-dot modification is a promising method to improve visible-light photocatalytic activities for traditional photocatalysts.
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CHEMISTRY OF MATERIALS
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2018
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IF 9.89
Xuefei Lu,Youju Huang,Baoqing Liu,Lei Zhang,Liping Song,Jiawei Zhang,Afang Zhang,Tao Chen
The two-dimensional (2D) monolayer gold nanoparticle (Au NP) film is of significant interest and importance in both fundamental and practical applications including optoelectronic devices, sensing, catalysis, and surface-enhanced Raman spectroscopy (SERS). Because of the weak physical interaction, the conventional monolayer Au NP film fabricated at the oil–water interface was unstable, easily breakable, and difficultly transferred. In the present work, we report on a simple and effective chemical cross-linking strategy at the air–water interface to achieve a large-scale monolayer gold nanoparticle film with intelligently tunable size of nanogaps, and excellent free-standing and easily transferable properties. In our strategy, acrylamide, a polymerizable molecule, was first modified on the surface of Au NPs for subsequent self-assembly into a monolayer film at the liquid–liquid interface. Through photopolymerization of acrylamide, a chemically cross-linked film was formed with closely packed nanoparticles, highly macroscopic uniformity, and excellent free-standing property, which allowed it to be easily transferred from the air–water interface onto various solid substrates while maintaining its integrity. It is interesting to find that the macroscopic film underwent an in situ shrinkage under irradiation of UV-light, and its area shrinkage ratio is close to 55% (equal to 2.2 times) of that from non-cross-linked counterparts. More importantly, UV-light-controlled in situ shrinkage of the Au NP film would lead to intelligently, precisely tuned nanogaps less than 0.5 nm between neighboring Au NPs for maximal amplification of SERS signals, and the macroscopic uniformity of the films ensured the reproducible performance of SERS signals, providing an ideal candidate for SERS applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
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IF 5.091
Qi Wang,Enqin Liu,Chenlu Zhang,Siwei Huang,Yanqing Cong,Yi Zhang
A novel visible-light-active Cs 3 PMo 12 O 40 /Bi 2 O 3 (CsPMo/Bi 2 O 3 ) composite was prepared by a simple dissolution-precipitation method. The as-prepared samples were characterized by XRD , XPS , FT-IR, SEM , UV–Vis DRS , N 2 adsorption-desorption isotherms and electrochemical analysis . The results revealed that Bi 2 O 3 was successfully modified by trace CsPMo. After the addition of H 3 PMo 12 O 40 acid (HPMo), the surface of Bi 2 O 3 can be roughed. Subsequently, the presence of Cs 2 CO 3 can neutralize the protons of HPMo forming CsPMo precipitate on Bi 2 O 3 . Comparing to naked Bi 2 O 3 and CsPMo, the binary composite exhibited many beneficial characteristics in charge generation and separation, such as formation of p-n heterojunction , decreased band gap, enhanced photocurrent response and greatly reduced charge transfer resistance. The photocatalytic activities of the as-prepared samples were evaluated by the degradation of phenol under visible light . The calculated pseudo-first-order rate constants for phenol degradation were 2.7 and 14.8 times relative to that on Bi 2 O 3 and CsPMo, respectively. Dramatically enhanced photocatalytic performance can be observed when the optimal CsPMo/Bi 2 O 3 composite (2.5% CsPMo) was applied. The major active species involved in the degradation process are in the following order: superoxide radical (O 2 − ) > hydroxyl radical ( OH) ≈ hole (h + ). Besides, the CsPMo/Bi 2 O 3 composite also displayed good stability in cyclic experiments.
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PubMed
高影响因子
FERROELECTRICS
·
2017
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IF 0.551
Peisong Tang,Longlong Yu,Jiayuan Min,Jiani Yang,Haifeng Chen
Using Fe(NO3)3·9H2O, Yb(NO3)3·5H2O, citric acid and ethylene glycol as main raw materials, the gel of YbFeO3 was prepared by sol-gel method. The gel was kept at 100 °C for 36 h to make xerogel. Then, the xerogel was calcined in muffle furnace at 800°C to make YbFeO3 samples. The structure and morphology of samples were characterized by thermogravimetry and differential scanning calorimetry (TG-DSC), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and UV-visible diffuse reflectance spectroscopy (DRS). The results showed that the perovskite structure YbFeO3 was obtained through sol-gel method. The resulting products have a particle size of 80 nm and an optical band gap of 2.0 eV. Consequently, the YbFeO3 nanoparticles showed high photocatalytic activities for decomposition of methyl orange under visible-light irradiation.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Hanyang Gao,Guoxin Hu,Juan Sui,Chao Mu,Wenfeng Shangguan,Min Kong,Wei Shentu
In this research, two interesting phenomena were reported and analyzed: First, two-dimensional tiny titania nanoplates (4–5 nm lateral size, 0.4–0.5 nm thickness) with rich edge-defects were found to self-assemble into free-standing thin sheets with large lateral size in a freeze-drying process with the aid of linker; Second, when subjected to a moderate hydrogenation treatment, these self-assembled sheets could be crystallized into integral anatase sheets while the edge-defects of the building blocks were maintained on the surface or inside the body of the crystal and the flexible sheet-like shape were also maintained. Based on these observations, a method for scalable preparing free-standing defect-rich TiO 2 with a two-dimensional sheet-like morphology was proposed. The defects (oxygen vacancies) endowed the TiO 2 a grayish-black color and visible-light responsibility. By using the dispersion of these defect-rich anatase sheets, a film could be densely deposited on flexible substrates in a layered structure and showed an efficient performance in acetaldehyde decomposition under the irradiation of visible light. Since it has always been a technical challenge to prepare crystallized visible-light-driven TiO 2 films on plastic substrates with a low heat tolerance, this work may also provide a new approach to this problem.
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Surfaces and Interfaces
·
2024
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IF 5.7
Mingzhu Zhou,Long Xiang,Yuanxia Quan,Li Li,Xingran Zhang
Many studies aimed to improve the antibacterial ability and applicability of antibacterial surface materials by altering their chemical composition and structure. In this study, we successfully prepared a multifunctional ZnO X /TiO 2 (0< X ≤ 2) nanocomposites by a sol-gel method, which exhibits visible light responsive self-cleaning, antibacterial adhesion, and antimicrobial properties. In the comparison of the three zinc sources, it was found that the ZnO X /TiO 2 prepared with zinc sulfate doping had a water contact angle of only 1.7°, with enhanced hydrophilicity, and exhibited the best photocatalytic activity under visible light, with a removal rate of up to 90.2% of methylene orange (MO). Antibacterial tests revealed the average diameters of the inhibition halos for Escherichia coli and Staphylococcus aureus were 10 and 12 mm, respectively, thereby showing excellent antibacterial activity under visible light. The low photogenerated electron-hole recombination and the high rates of ·OH and ·O 2 - generation through photo-induced interface charge transfer in ZnO X /TiO 2 composite, which is the main reason for enhancing the photocatalytic antibacterial activity under visible light irradiation. Release of Zn 2+ species, resulting in significant antibacterial performance even under dark conditions. This study combines doping and surface modification, introduce abundant surface hydroxyl groups to endow the composite material surface with superhydrophilicity, anti-bacterial adhesion, and antibacterial properties that can meet the needs of clean and antibacterial surfaces in medical.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jingyu Peng,Ting Wang,Rujing Wang,Song Wang,Hanzhuang Zhang,Xulan Xue,Wenyu Ji
Interfaces between functional layers are among the most crucial and intricate structures in electronic devices with a multilayer structure; they determine the injection and distribution of charge carriers, as well as the efficiency and stability of the devices. Here, a general but previously overlooked acidic surface of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films is investigated in detail to construct efficient perovskite light-emitting diodes. This potent acidity leads to the decomposition of perovskites by the diffusion of active protons coming from the PSSH components in PEDOT:PSS. A polyethylenimine ethoxylated (PEIE) modifying layer is used to neutralize the PSSH on the surface of PEDOT:PSS films, which not only protects the perovskites, but also enhances device efficiency greatly. A peak current efficiency of 56.7 cd/A is obtained, enhancing by about 7 times compared with the control device without PEIE (7.8 cd/A). Our work addresses a long-standing but seldom-discussed issue in perovskite light-emitting diodes—the strong dependence of device performance on the surface characteristics of PEDOT:PSS films.
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高影响因子
Aggregate
·
2024
·
IF 13.9
Wenye Sun,Bing Tian,Bang An,Rui Teng,Mingcong Xu,Chunhui Ma,Zhijun Chen,Haipeng Yu,Jian Li,Wei Li,Siqi Huan,Shouxin Liu,Orlando J. Rojas
Circularly polarized luminescent materials find extensive applications in 3D displays, information encryption, and photoinduced supramolecular chirality. However, controlling the handedness of circularly polarized luminescence remains a significant challenge in advancing optical technologies. In this study, we present a Janus circularly polarized light emitter comprising a fluorescent film combined with chiral nematic cellulose with switchable chirality. The emitter achieves maximum luminescence dissymmetry factors (0.28 and −0.65) through mode switching. In addition, we show the emitter's versatility in inducing chiral helices in azobenzene polymers with varying polar groups, resulting in significant chiral signals. Importantly, the chirality of these polymers can be switched by altering the luminescence mode of the emitter. These results are expected to facilitate the efficient design of chiral luminescent materials and photoinduction devices.
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