CRYSTENGCOMM
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2020
·Vol. 23
·期 4
·793-803
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IF 3.117
Zhuo Chen,Lvming Dong,Cheng Zhou,Binze Zhou,Zhi Zheng,Rong Chen,Jianfeng Zang
Two-dimensional all-inorganic halide perovskites (CsPbX3, X = Cl, Br or I) have emerged as prominent materials due to their unique properties, including ultrathin thickness in high surface area for catalysis, good mechanical flexibility for flexible electronics/optoelectronics, and high charge extraction and transport for photodetectors. However, the high luminescence of two-dimensional Mn-doped CsPbX3 that is crucial to light-emitting diodes and display applications remains unfulfilled. The existing synthesis approaches of two-dimensional Mn-doped CsPbX3 usually result in low luminescence because of either low solubility of precursors at low temperature or high concentrated nanocubes at high temperature (e.g. 180 °C). Herein, we report a moderate-temperature and atmospheric approach to synthesize highly luminescent Mn-doped CsPbCl3 nanoplatelets with only 4 monolayers. Different Mn–Pb feed ratios are explored to study the morphology evolution from nanocubes to nanoplatelets and the corresponding influence of two emission peaks at around 400 nm and 600 nm. The photoluminescence quantum yield (PLQY) of our Mn-doped CsPbCl3 nanoplatelets is up to 53.76%, which is the highest reported value in Mn-doped two-dimensional all-inorganic halide perovskites. The nanoplatelets exhibit excellent stability at room temperature in air (over 60 days). For the first time, both orange-red and warm white light-emitting diodes (LEDs) have been achieved through the nanoplatelets as the color conversion materials. Moreover, flexible composite fluorescent polymer films based on the nanoplatelets are demonstrated with high luminescence and stability (over 6 months), which indicate prominent potential in flexible displays.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
Siyao Guo,Lifeng Chi,Tiejun Zhao,Youbo Nan,Xin Sun,Yanliang Huang,Baorong Hou,Xiutong Wang
The photocathodic protection is a promising technology for corrosion protection by utilizing the solar energy. Herein, a typical metal-organic framework (MOF), NH 2 -MIL-125 is introduced to construct MOF/semiconductor heterostructure via a simple two-step method. The composites, based both on TiO 2 nanotubes and coatings, exhibit improved photocathodic protection performance under visible light irradiation . The results reveal that the NH 2 -MIL-125/TiO 2 heterojunction significantly suppresses the recombination of photoinduced electron-hole pairs, ultimately achieves efficient photocathodic protection for 304SS . This research highlights the superiority of the MOF/semiconductor composites on the photocathodic protection and the universality of decorating MOF on different TiO 2 structures.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Jialin Jia,Dongmei Liu,Jiayu Tian,Wei Wang,Jiaxin Ni,Xin Wang
In this study, a novel peroxymonosulfate (PMS) activation method by visible light (VL) excited humic acid (HA) was developed and applied to degradation of bisphenol A (BPA). Results showed that, in HA (2 mg/L)/PMS (1 mM)/VL system, the degradation rate of BPA could reach 95.4% within 30 min, which was much higher than that of HA/VL system (9.4%) and PMS/VL system (15.5%). Meanwhile, the concentration of HA was also decreased in this process and the original structure of HA was obviously destroyed. Reaction mechanism accounting for the effect of HA on BPA degradation in the PMS/HA/VL system was explicated by the quenching experiments, electron paramagnetic resonance (EPR) detection and HA fractionation experiments. Results showed that singlet oxygen ( 1 O 2 ), hydroxyl radical ( OH) and sulfate radical (SO 4 − ) were all involved in the system, and 1 O 2 was the primary reactive species responsible for BPA degradation. The aromatic constituents of HA made the dominant contribution to the generation of reactive species, in which the phenolic groups played the role of electron-donor, and the quinone moieties acted as the electron shuttles could accelerate the electron-transfer between HA and PMS, which thus activated PMS to form the reactive species for BPA degradation. As HA is ubiquitous in nature, this study may provide a new insight into the in situ water treatment with the assistance of PMS.
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ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Xiaojie Li,Han Sun,Xuemei Mao,Yongmin Lao,Feng Chen
The synthesis of high-value bioproducts has attracted immense attention in the scientific and industrial fields due to its health and economic benefits. Such bioactive compounds are typically manufactured by either synthetic approaches from petrochemical sources or biogenetic pathways existing in living organisms. Herein, we report a hybrid bioinorganic light-driven cell factory by integrating microalgae Chlorella zofingiensis with efficient light-harvesting gold nanoparticles (AuNPs) and demonstrate the enhanced photosynthesis of natural bioproducts (i.e., carotenoids) for the first time. Our results show that smaller AuNPs (5 nm) can be internalized by C. zofingiensis and increase the production of carotenoids to 10.7 ± 1.2 mg/L, 42.7% higher than the native microalgae. We confirm that AuNPs can significantly improve the relative electron transport rate in photosystem II and reactive oxygen species (ROS) levels in microalgae, thus elevating the overall photosynthesis toward carotenoids. This rationally designed biohybrid system provides a promising alternative to produce high-value bioproducts of interest.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Meng Zhang,Juan Xue,Yi Zhu,Chi Yao,Dayong Yang
Aerogels hold great promise as a lightweight replacement in materials fields. Dynamic fluorochromic aerogels that possess reversible stimuli responsiveness have been particularly attractive recently for new design opportunities in practical solid-state lighting and wide applications in advanced sensors/probe. In this study, we report a reversibly multiresponsive white-light-emitting (WLE) aerogel prepared with codoped lanthanide, thymidine, and carbon dots. By precisely modulating the stoichiometric ratio of lanthanide complexes and carbon dots, broad-spectrum output from purple to red is obtained, including pure white light (CIE (0.33, 0.32)). The freeze-drying process contributes to the elimination of hydration between water molecules and lanthanide ions, further preventing the quenching of lanthanide luminescence and preserving the high quantum yield (47.4%) of our aerogel. Moreover, the dynamic coordination bond between lanthanide (europium and terbium) and thymidine endows the aerogel with reversible responsiveness upon five different stimuli, including halide anions, metal ions, pH, temperature, and humidity. We envision that our WLE aerogel has considerable potential for use in various fields such as display devices, advanced sensors, and environmentally friendly probes where multiresponsiveness is required.
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PubMed
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2020
·Vol. 36
·期 3
·447-452
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IF 1.063
He Yilei,Zhang Xing,Wei Yanze,Chen Xiaoyu,Wang Zumin,Yu Ranbo
Nanostructured N-doped TiO 2 photocatalyst has been prepared via a new approach from Ti-based MOF[NH 2 -MIL-125(Ti)] precursor. The success of N doping enhances light absorption and narrows the bandgap. Moreover, the as-prepared nanostructure is constructed with tiny nanoparticles and resembles a pie-like morphology inherited from the MOF, which accelerates electron transfer. Hence, as a photocatalyst for the degradation of methylene blue(MB) under visible light irradiation, the N-doped TiO 2 (N-TiO 2 ) nanostructure shows higher photocatalytic activity with a reaction rate constant of 0.018 min −1 than that of the TiO 2 -P25 and TiO 2 under the visible light.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Junjian Zhao,Jingwen Xu,Xiaoxia Jian,Jing Xu,Zhida Gao,Yan-Yan Song
Titanium dioxide (TiO2) nanomaterials have attracted much interest in life science and biological fields because of their excellent photocatalytic activity and good biocompatibility. However, owing to its wide band gap, photocatalysis of TiO2 can be only triggered by UV light. The limited transparent depth of UV light and the generated reactive oxygen species (ROSs) cause inflammation response of skin tissue, thus posing two major challenges in the photocatalytic application of TiO2-based materials in drug delivery and other biotechnology fields. Here, we propose an upconversion-related strategy to enable the photocatalytic activity of TiO2 nanotubes in near-infrared light and apply the system as a controllable drug delivery platform. More importantly, the ROS-induced cytotoxicity and the preleaching of payloads are significantly reduced on the as-proposed amphiphilic TiO2 nanotubes. The hydrophobic monolayers are served as a “cap” to provide protection for ROS-induced inflammation and long-term storability. This amphiphilic drug delivery system broadens the potential applications of TiO2-based nanomaterials in biomedicine.
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PubMed
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MATERIALS CHEMISTRY AND PHYSICS
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2020
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IF 3.408
Lifu Lin,Haidong Wu,Yuerui Xu,Kunji Lin,Wenjing Zou,Shanghua Wu
In this research, we report a novel approach to fabricate complex-shaped aluminum nitride (AlN) ceramics via digital light processing (DLP)-based stereolithography . The rheological behaviors, curing kinetics, and mechanical properties were investigated. Compared to unmodified AlN powders, AlN powders modified by stearic acid and oleic acid showed better wettability with resin. The excess cure widths, cure depths, and depth sensitivities of the AlN suspensions with modified powders were decreased. However, their critical energy was increased because of the increased absorbance of the modified AlN powders. Finally, complex-shaped AlN ceramic parts were fabricated by DLP with sintered-body relative densities exceeding 99% of the theoretical density. The flexural strength and hardness of the sintered sample were 398 ± 10.4 MPa and 10.47 ± 0.08 GPa, respectively, indicating prospective applicability in the industry.
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Journal of Oceanology and Limnology
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2020
·Vol. 38
·期 5
·1517-1531
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IF 0.617
Tian Jing,Chen Zhuoyuan,Jing Jiangping,Feng Chang,Sun Mengmeng,Li Weibing
The Cu 2 O/TiO 2 p-n heterojunction composite photoelectrodes were prepared by depositing Cu 2 O nanoparticles on the surface of TiO 2 nanotubes via anodic oxidation and constant current deposition. Field emission scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) analyses showed that Cu 2 O nanoparticles not only deposited on the surface of TiO 2 nanotube array, but also on the wall of TiO 2 nanotubes. The Cu 2 O deposition amount could be adjusted by changing the deposition time. The photoelectrochemical cathodic protection (PECCP) performance of the prepared photoelectrodes for 316L stainless steel (SS) was tested under visible light. The constant current deposition time had a significant effect on the PECCP performance of Cu 2 O/TiO 2 -X photoelectrodes and Cu 2 O/TiO 2 -20 had the best PECCP performance for the coupled 316L SS. This was attributed to the appropriate amount and thickness of Cu 2 O to form p-n heterojunctions with TiO 2 , in which separation of the photogenerated carriers was accelerated and transfer of the photogenerated electrons to 316L SS for PECCP was facilitated.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2020
·
IF 5.278
Ting Wang,Ling-li Jiang,Lu-lu Huang,Li-guang Wu,Chun-juan Li,Jing Cai
To enhance the performance of ultrafiltration membranes, a polyvinylidene fluoride (PVDF) blending membrane with photo-induced antifouling performance was fabricated. La 3+ - and Yb 3+ -doped titanium dioxide-reduced graphene oxide (TiO 2 -RGO) composites were initially prepared by adsorption-phase synthesis coupled with solvothermal reduction. The doped TiO 2 -RGO composites were then blended with the PVDF materials. The results showed that adding well-distributed, doped, and hydrophilic TiO 2 -RGO improved the pore structures and surface polarity of the blending membranes, thus improving their permeation and antifouling performance. After addition of doped TiO 2 -RGO with photocatalytic activity, the antifouling performance of the resulting blending membranes increased under weak visible-light irradiation. The agglomerated doped TiO 2 -RGO in the polymeric matrix reduced the hydrophilicity and porosity of the resulting membranes, thereby decreasing their water permeability and antifouling performance. Solvothermal reduction through ethylene glycol also improved the photocatalytic activity of Yb-doped TiO 2 -RGO and enhanced the affinity between doped TiO 2 -RGO and PVDF. These two effects simultaneously increased the water permeability and photo-induced antifouling performance of the blending membranes. The flux recovery rate of the blending membranes containing Yb-doped TiO 2 -RGO treated by ethylene glycol exceeded 69% after illumination. In particular, the flux recovery rate of membranes reached about 96% after illumination coupling with washing.
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ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Longzhu Zheng,Hongqiang Li,Wei Huang,Xuejun Lai,Xingrong Zeng
Fabrication of superhydrophobic films with large and sensitive deformed actuations driven by light stimuli for the emerging application fields such as biomimetic devices, artificial muscles, soft robotics, electric switches, and water-droplet manipulation remains challenging. Herein, a facile strategy is proposed to fabricate a light stimuli-responsive superhydrophobic film (LSSF) by integrating a bottom carbon nanotube/poly(vinylidene fluoride) (CNT/PVDF) layer, a middle chitosan (CS) layer, and a top superhydrophobic fumed silica–chitosan (SiO2/CS) layer modified with 1H,1H,2H,2H-heptafluorodecyltrimethoxysilane (FAS). Under near-infrared (NIR) light irradiation, the LSSF quickly bent toward the CS layer with a large bending angle (>200°), high sensitivity (∼7 °C change), and great repeatability (>1000 cycles), which was attributed to the significant difference in the coefficient of thermal expansion (CTE) between CS and PVDF and the water desorption-induced volume shrinking in the CS layer. Furthermore, the LSSF also exhibited superhydrophobicity with a high water contact angle of 165° and a low water sliding angle of 2.8°. Importantly, owing to the high light absorption of CNTs, the LSSF-based biomimetic flower was able to not only bloom under NIR light exposure but also normally work when applying sunlight irradiation. Thanks to the electric conductivity and excellent water repellency, the LSSF was capable of being designed as an electric switch to remotely turn on/off the circuit even under a watery environment, and the LSSF was further successfully applied in water-droplet manipulation. The findings conceivably provided a new strategy to fabricate light stimuli-responsive superhydrophobic films for versatile applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yanlong Shao,Wenbo Du,Yong Fan,Jie Zhao,Zhihui Zhang,Luquan Ren
Great attention has been paid to superhydrophobic surface with tunable water adhesion behaviors, but many challenges still remain for developing a surface with accurate regional control of the superwetting behaviors to realize on-demand responses. Herein, a superhydrophobic surface with accurately controllable water adhesion performance for local areas has been developed, by integrating carbonyl iron particles (CIPs) into a shape memory polymer (SMP) to get photothermal-responsive pillar array. The morphologies of the programmed surface can be remotely and accurately regulated through near-infrared (NIR) light irradiation, hence resulting in the accurate control of surface superwetting behaviors. By adjusting the intensity and targeted area of the NIR irradiation, the controllable surface deformation even in a minimal area of ~0.95 mm 2 can be achieved. Among those, the surface with bent microstructures demonstrates high water adhesion force (98 μN) with a high water rolling-off angle (even the surface was overturned to 180°), whereas the superhydrophobic surface with the recovered micro/nanostructure arrays exhibits relatively low water adhesion force (25 μN) with an extremely low rolling-off angle (4°). We have proven that these programmable superhydrophobic surfaces can not only accurately adjust the droplet adhesive force in the target area, but also serve as ideal platforms for distinct microfluidic microreactors. These unique characteristics endow the NIR light remotely controlled superhydrophobic surfaces with special advantages for abroad applications in liquid droplet manipulations, micro reactions, biochemical detections, etc.
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