MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Zhiqiang Zhou,Yuanping Liao,Huiyan Wu,Qi Xiao,Yi Liu,Liyun Yang
Herein, zeolitic imidazolate framework-8 capped gold nanoclusters (AuNCs@ZIF-8) was fabricated and developed as an “on-off-on” fluorescent nanoprobe for selectively and sensitively detecting KMnO 4 and ascorbic acid (AA). The prepared AuNCs@ZIF-8 initially exhibited strong fluorescence at 595 nm KMnO 4 could quench the fluorescence of AuNCs@ZIF-8, rendering the fluorescence signal of AuNCs@ZIF-8 in the “off” state. The probe allows KMnO 4 to be detected with a 10 nM detection limit and the linear analytical range was 0.05–2 μM. When AA was added into the AuNCs@ZIF-8/KMnO 4 system, the fluorescence of the AuNCs@ZIF-8 recovered due to the redox reaction between KMnO 4 and AA, and the fluorescence signal of the system turned “on”. The detection limit of AA was 37 nM in a good linear concentration range of 0.05–5 μM. Furthermore, this AuNCs@ZIF-8 nanoprobe was successfully used for AA detecting in fresh orange juices with the recoveries ranged from 96.6% to 108.2%, which validates the potential applicability of this strategy.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
·
IF 5.999
Liangjie Shi,Yong Jin,Shuangquan Lai,Long Bai,Rong Zhou,Yutang Zhou,Xiang Shang
Polymeric micelle has emerged as an efficient implement to overcome the shortcomings of conventional cancer chemotherapy due to its superior solubility of hydrophobic drugs and less side effects of drugs. However, insufficient dilution resistance and ordinary therapeutic effect severely restrict the further translation of current drug-loaded polymeric micelles. Here, we showed that well-defined G-Fn (n = 5, 9, 13) polymeric micelles possessed excellent capabilities as a drug carrier in light of high drug loading content, high stability and precise drug release combined with wonderful endocytosis efficiency to tumors. The representative G-F13 exhibited an excellent dilution resistance, outstanding high drug loading content (22 wt%) and drug loading efficiency (82%), which might be attributed to the extremely low critical micelle concentration conferred by its special Gemini structure and the superhydrophobicity of the fluorocarbon chain. Furthermore, the “cross-linked” internal fluoride membrane consisted of the two chains of the Gemini structure made G-F13 stable even after 24 h of incubation in 10% fetal bovine serum (FBS). The camptothecin (CPT) release was selectively triggered by glutathione (GSH) and H 2 O 2 , reaching 75% and 85% after 24 h respectively, in which only 15% of drugs leak under physiological conditions. The CCK-8 assays of Hela cells showed that CPT-loaded G-F13 micelles had high cell compatibility (200 μg/mL, 93% cell viability , 48 h) and high cancer cytotoxicity (IC50 0.1 μg/mL). Notably, a tenfold lower dosage of loaded CPT had an higher tumor growth inhibition than the free CPT. This result was attributed to the combined treatment of fluorinated drug carriers were more likely to penetrate the cell membrane to enter tumor cells, the cytotoxicity of selenic acid generated after the oxidation of G-F13 and the large amounts of CPT after redox release. Excellent physical and chemical properties as well as good therapeutic effects reveal that G-F13 can act as a promising drug carrier to widely use in cancer chemotherapy.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2022
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IF 4.383
Mehboob Hassan,Mirza Mahmood Baig,Khalid Hussain Shah,Aftab Hussain,Syeda Aqsa Hassan,Arshad Ali
The synthesis of an economical and efficient bifunctional electrocatalyst for general water splitting is necessary for the fabrication of eco-friendly H 2 energy. Herein, state-of-the-art ZIF-67-based CoSe/MoSe 2 hybrid nanospheres were synthesized and examined as a bifunctional electrocatalyst for Hydrogen evolution reaction (HER) and Oxygen evolution (OER) in basic media. For the first time, a hierarchical well-designed CoSe/MoSe 2 hybrid nanospheres designed with the uniform distribution layered of 2D-MoSe 2 and conductive CoSe nanoparticles are acquired from CoMoO 4 via selenization. Due to its large surface area and extraordinary morphology, it exhibited significant catalytic activity, which leads to a small overpotential of 110 mV for HER and for 240 mV OER along with low Tafel values of 54.24 and 51.98 mV dec −1 , respectively. Surprisingly, the stability is marvelous and also comparable to the standard of HER and OER. The enhancement is endorsed by the increase in conductivity evolved from the porous nanospheres and the collaborative effect of Co/Mo. To deliver a current density of 10 mA per cm 2 for full water splitting 1.56 V is required, which is one of the least reported voltages. Therefore, this work leads to a new class of catalysts for the fabrication of an efficient water electrolyzer.
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高影响因子
ACS Applied Energy Materials
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2022
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IF 6.959
Yuping Che,Bingxin Lu,Huaxiang Chen,Jin Zhai,Kefeng Wang,Huaiqiu Chang,Zhaoyue Liu
Adding a cocatalyst to a semiconductor catalyst is often considered an effective measure to increase the efficiency of the photocatalytic hydrogen evolution reaction. Nowadays, noble metals are the state-of-the-art cocatalysts for the hydrogen evolution reaction. Due to their high cost and scarcity, it is imperative to develop cocatalysts prepared from cheap and abundant elements. Here, RuSe2 was used as an effective substitute for precious metal promoters such as Pt to enhance the efficiency of g-C3N4 for the hydrogen evolution reaction. A high efficiency of 13417.3 μmol·g–1·h–1 was obtained. It was 214 times higher than that of g-C3N4 and 2.8 times higher than that of 3%Pt/g-C3N4. Density functional theory calculations were performed. The (210) and (200) crystal faces of RuSe2 showed lower ΔGH* than Pt(111), indicating higher hydrogen evolution efficiency. Compared with the Pt cocatalyst, metallic RuSe2 cocatalysts exhibited superior performance. Meanwhile, the electrocatalytic activity was also investigated in an alkaline medium. It showed a decent electrocatalytic activity and high stability. These findings might provide a prototype to develop cheap and efficient cocatalysts for large-scale water splitting.
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Materials Express
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2022
·Vol. 12
·期 4
·609-615
·
IF 1.111
Liu Hao,Fan Li,Wei Qichen,Song Haizeng,Zhu Hongliang,Hu Mengdi,Yan Shancheng
Anisotropic growth of selenium leads to formation of one-dimensional structure of selenium, and reaction conditions mostly determine the morphology of products. In this study, one-dimensional selenium materials were prepared directly from selenium powder by microwave-assisted method.
Selenium nanotubes and selenium nanorods were synthesized by adjusting the ratio of ethylene glycol to water. The as-prepared products were characterized by Transmission Electron Microscope (TEM), Selected area electron diffraction (SAED), X-ray diffraction (XRD), Raman spectroscopy, photoluminescence
spectroscopy and UV-Vis absorption spectroscopy, and their electrical properties were also tested. Results from High Resolution Transmission Electron Microscope (HRTEM), SAED and XRD patterns showed that the prepared selenium nanotubes had good single crystal microstructure, and its possible
growth direction of t-se nanotubes was 001. The selenium nanotubes had strong light response compared with dark condition under 650 nm laser irradiation. We hope that the selenium nanotubes will have a better development prospect in the direction of semiconductor devices.
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Catalysis Science & Technology
·
2022
·Vol. 12
·期 9
·2865-2871
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IF 6.177
Wenkai Ji,Zaixiang Xu,Shijie Zhang,Yang Li,Zhikang Bao,Zijiang Zhao,Liang Xie,Xing Zhong,Zhongzhe Wei,Jianguo Wang
Photocatalytic production of hydrogen peroxide (H2O2) has received great attention as a promising route for sustainable solar fuel. In this work, we demonstrate that quantum dots (QDs) can be explored as a useful photocatalyst for high-efficiency photocatalytic production of H2O2 under visible-light with a record-high concentration of 126 mmol L−1. By band structure and wavefunction engineering, QDs exhibit an enhanced stability in an oxidized and humid environment. An oil/water two-phase system is designed to realize spontaneous separation of the H2O2 formed to the aqueous phase and of the organic by-products formed to the oil phase. By electron paramagnetic resonance (EPR) measurements, ˙O2− radicals are generated from QDs in the oil phase and transferred to the water phase immediately. The results in this work show that QDs with a rational surface and structure design can serve as an outstanding photocatalyst for the production of H2O2 under visible-light.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Linfeng Wang,Jinke Bai,Tingting Zhang,Xiaoyue Huang,Tianyi Hou,Bing Xu,Dongyu Li,Qinghua Li,Xiao Jin,Yuxiao Wang,Xueru Zhang,Yinglin Song
The emission linewidth of quantum dots (QDs) is one of the important optical properties, which is essential for the applications of QD lasers, high-quality displays, and biological imaging. However, we know less about controlling emission linewidth and its underlying mechanisms. Here we introduce a wurtzite ZnSe shell onto a wurtzite CdSe core to produce asymmetric strain due to their large, anisotropic lattice mismatch. Such asymmetric pressure induces significant splitting (Δ AB ) between heavy-hole (hh) and light-hole (lh) in valence band (VB). We show that the emission intensity from the lh state (E lh ) is significantly suppressed with the increasing Δ AB caused by the strong asymmetric strain. We demonstrate that the exciton-phonon coupling (EPC) is greatly inhibited under the anisotropic lattice strain. The alloying process between the core and shell occurs under the strong lattice strain and raises the longitudinal-optical (LO) phonon energy (E LO ). Higher LO phonon energy declines LO phonon occupation numbers (N LO ) and synergistically reduces the EPC. The asymmetrically strained alloy QDs ensemble exhibits highly bright emission with ultra-narrow linewidths of 13.8 nm (∼520 nm) and 15.8 nm (∼620 nm). This concept of band structure regulation via asymmetric strain can provide a new platform for high-quality QDs beyond the currently achieved.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Liying Zhang,Pei Xie,Hang Wu,Jiulong Zhao,Shige Wang
Acute pancreatitis (AP) is a disease with high mortality which could cause an inflammatory responses such as edema and necrosis of the pancreatic tissue. Studies have proved that the excessive produced reactive oxygen species (ROS) and reactive nitrogen species (RNS) play an important role in the pathogenesis of AP. Although progresses have been made for ROS and RNS elimination using artificial enzymes, biocompatible nanomaterials with advanced multi-enzymatic activities have been rarely studied. In this study, we constructed a simple and efficient method to fabricate a two-dimensional (2D) MoSe 2 @PVP nanosheets (NSs) as an artificial enzyme to treat oxidative stress-related diseases. Both in vitro and in vivo experiments proved that MoSe 2 @PVP NSs have good biocompatibility. Interestingly, the MoSe 2 @PVP NSs simultaneously showed the thermal durable peroxidase, catalase, superoxide dismutase, and glutathione peroxidase mimicking capacities, which endowed the material with good ROS and RNS scavenging abilities. The MoSe 2 @PVP NSs were engaged in treating the AP in an animal model, which led to a significant down-regulation of serum levels of amylase, IL-6, IL-1β, and TNF-α. Further H&E staining of pancreatic tissue validated the AP therapeutic effect of MoSe 2 @PVP NSs. We hope that our research will facilitate the development of multifunctional artificial enzymes for the treating of oxidative stress-related diseases.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 22
·10003-10016
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IF 4.682
Zeng Min,Wang Mingshan,Zheng Luojia,Gao Weichen,Liu Rui,Pan Jie,Zhang Hongqing,Yang Zhenliang,Li Xing
Lithium-sulfur battery is expected to be the new generation of high-performance electrochemical storage system benefiting from its high energy density and low cost. However, the slow redox kinetics caused by the low conductivity of sulfur and the shuttle effect result from lithium polysulfides (LiPSs) limit its practical utility. In this work, a highly efficient strategy of freestanding carbon cloth supported molybdenum oxide (CC/MoO 3 ) with in situ deposition of Li 2 S 8 as an active matrix is designed. This chemistry enables strong affinity of Li 2 S 8 on CC/MoO 3 electrode, meanwhile, the strong polarity of MoO 3 catalyzes the mutual transformation of LiPSs and inhibits the shuttle of liquid LiPSs. With the above superiorities, the CC/MoO 3 @Li 2 S 8 electrode shows impressive electrochemical performance, with a high initial discharge specific capacity of 1274 mAh g −1 at a rate of 0.1 C with the sulfur loading of 2 mg cm −2 , and a capacity retention rate of 93.1% compared to the initial stable specific capacity. Even with a high sulfur loading of 4 mg cm −2 , it still maintains high electrochemical activity with a high reversible specific capacity of 916 mAh g −1 after 100 cycles at 0.2 C. Those results show that coupling polar metal oxide material with flexible conductive carbon cloth provides a highly efficient catalytic/conductive network to accelerate sulfur utilization and stability. Graphical abstract A highly efficient strategy of freestanding carbon cloth supported molybdenum oxide with in-situ deposition of Li 2 S 8 as active matrix is realized, resulting in a robust Li + storage capacity for lithium-sulfur battery.
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Frontiers in Chemistry
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2022
·
IF 5.545
Deng Yalei,Chen Xufeng,Liang Jing,Wang Yuanyuan
Stabilizing nanocrystals (NCs) with high fluorescence quantum efficiency in suitable solvents and tuning of their optical properties precisely are critical for designing and assembling optoelectrical devices. Here, we demonstrated that by replacing the original X-type ligand (R-COO-) with triethylborate (TEB), zinc-blend structure nanoplatelets (Zb-NPLs) turn from hydrophobic to hydrophilic and are quite stable in polar solvents. More importantly, a large shift of 253 meV is observed for the TEB-passivated NPLs, which can be attributed to the strain of the crystal lattice and the electron or hole delocalizing into the ligand shell. It is worth noting that unlike conventional inorganic ligands, such as metal chalcogenide complexes or halides that quench fluorescence, TEB-treated NPLs maintain 100% of their original brightness in polar solvents with a slight increase in full width at half maximum (FWHM, 32 nm). Furthermore, we explored the possibility of employing TEB as surface ligands for NPLs with different thicknesses and compositions. We believe the discovery of new surface chemistry using borate-related ligands can greatly expand the potential application areas of NPLs.
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JOURNAL OF APPLIED PHYSICS
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2022
·Vol. 131
·期 14
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IF 2.877
Chen Guifeng,Du Qinghua,Zhang Hui,Niu Ruotong,Yuan Wenhao,Xie Xinjian,Guo Tianyu,Liu Guodong
Quantum dots of I–III–VI ternary compounds exhibit unusual photophysical properties and technological utility, which attract attention and have been intensely investigated. CuInSe 2 quantum dots are an environmentally friendly composition, a direct transition, and an adjustable bandgap. Here, we discuss the influence of the Cu/In molar ratio of CuInSe 2 quantum dots on Cu-related defects and photo-physical properties, and CuInSe 2 quantum dots are synthesized by a green, safe, and low-temperature method in triethylene glycol. The proportion of the +1 and +2 oxidation states of Cu in the quantum dots will change with the Cu/In molar atomic ratio. The +1-oxidation state of Cu will prolong the carrier recombination lifetime and provide favorable conditions for the transfer and collection of carriers. By adjusting for different defect types, we can better apply CISe quantum dots in devices and other fields.
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Advanced Science
·
2022
·Vol. 9
·期 15
·2106120
·
IF 17.521
Peng Wang,Yu Chu,Abudukadi Tudi,Congwei Xie,Zhihua Yang,Shilie Pan,Junjie Li
Design and fabrication of new infrared (IR) nonlinear optical (NLO) materials with balanced properties are urgently needed since commercial chalcopyrite-like (CL) NLO crystals are suffering from their intrinsic drawbacks. Herein, the first defect-CL (DCL) alkali-earth metal (AEM) selenide IR NLO material, DCL-MgGa 2 Se 4 , has been rationally designed and fabricated by a structure prediction and experiment combined strategy. The introduction of AEM tetrahedral unit MgSe 4 effectively widens the band gap of DCL compounds. The title compound exhibits a wide band gap of 2.96 eV, resulting in a high laser induced damage threshold (LIDT) of ≈3.0 × AgGaS 2 (AGS). Furthermore, the compound shows a suitable second harmonic generation (SHG) response (≈0.9 × AGS) with a type-I phase-matching (PM) behavior and a wide IR transparent range. The results indicate that DCL-MgGa 2 Se 4 is a promising mid-to-far IR NLO material and give some insights into the design of new CL compound with outstanding IR NLO properties based on the AEM tetrahedra and the structure predication and experiment combined strategy.
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