JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Xin He,Rongfei Wei,Xiangling Tian,Jianrong Qiu,Mei Zhang,Qingguang Zeng,Junyan Liu
Te-Bi 2 Te 3 alloy thin film has grown on silicon dioxide substrate by thermal evaporation technique. The Bi 2 Te 3 rhombohedral structure enriched Te in the prepared thin film was identified by high solution transmission electron microscopy (HRTEM), X-Ray diffraction (XRD), Raman spectrum and X-ray photoelectron spectroscopy (XPS). Interestingly, the Te-Bi 2 Te 3 alloy thin film presents a changeover from saturable absorption (SA) to reverse saturable absorption (RSA) as continuously increasing the input intensity, which has been investigated using the open-aperture (OA) z-scan measurement under a femtosecond-pulsed laser at 800 nm. A high modulation depth of 48.3% and large saturation intensity of 24.1GW/cm 2 of the thin film were obtained. Moreover, a large nonlinear absorption coefficient β of ∼10 3 cm/GW is increased with the input intensity elevated. The research results demonstrate that the Te-Bi 2 Te 3 alloy thin film could be an emerging optical material for saturable absorber in Q-switched or mode-locking fiber lasers at low incident intensity while serve as optical limiter at high incident intensity.
研究领域:
材料科学
·
凝聚态物理
·
光学工程
·
纳米材料
·
光电子学
✓ 已验证
DOI
高影响因子
Materials Today Physics
·
2022
·
IF 11.021
An Hua,Zifeng Mai,Binyu Wu,Zichong Ji,Min Fu,Yougen Hu,Siya Huang
Flexible and stretchable electrodes as the cornerstone of bioelectronics are bridging human with biomedical devices in an unprecedentedly intimate and safer way. However, maintaining high electrical properties while adapting to moist, complex and dynamic biosurfaces for a prolonged period of usage remains a great challenge. Herein, we demonstrate an omnidirectionally stretchable transparent electrode based on serpentine Au nanotrough (AuNT) networks with highly tunable optoelectronic performances (sheet resistance of down to ∼13 Ω sq −1 at transmittance of 90%). Owing to the junction-free nanoweb structure with an ultralow percolation density, the AuNT networks demonstrate excellent thermal stability as an efficient Joule heater with a wide operating temperature range up to 390 °C. The in-plane buckled AuNT electrode exhibits controllable heat generation upon repetitive tensile strains of 60%, enabling wearable thermotherapy at highly strained joints . Such highly stretchable electrodes can be directly laminated on the balloon catheter as expandable, high-density nanomesh ablators, showing excellent thermal and moisture stability during 15 days of storage under conditions of relative humidity of 85% at 70 °C and over 1000 heating cycles to 60 °C, offering strong potential for biomedical therapeutics , such as thermal ablation and electrochemotherapy.
研究领域:
生物医学工程
·
柔性电子学
·
转化医学
·
生物传感器
·
组织工程
·
纳米医学
·
穿戴式医疗设备
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 15
·2200605
·
IF 10.05
Shaofan Fang,Bo Zhou,Huixia Li,Hanlin Hu,Haizhe Zhong,Henan Li,Yumeng Shi
Metal halide perovskites are promising optoelectronic materials due to their unique luminescent properties. However, their practical application is limited by their poor chemical stability, especially in humid environments. Moisture can cause phase changes or chemical decomposition, resulting in significant fluorescence quenching. In this study, a copper-based organic–inorganic hybrid metal halide (t-BA) 3 Cu 6 I 9 is synthesized (t-BA + is the tert-butyl-ammonium ion (C(CH 3 ) 3 NH 3 + )). This material exhibits water-induced luminescence, and its chemical stability in humid environments is being investigated. Tetragonal t-BA 3 Cu 6 I 9 is not luminescent, but it reacts quickly with water in the air. The resultant (t-BA) 2 Cu 2 I 4 ·H 2 O has a broad green emission peak at 520 nm, high photoluminescence quantum yield of 59.4%. Remarkably, (t-BA) 2 Cu 2 I 4 ·H 2 O is converted back to t-BA 3 Cu 6 I 9 at temperatures above 40 °C. This phase conversion is highly repeatable, and the luminescent intensity can be fully recovered after 50 transformation cycles. The mechanism of luminescence is investigated through temperature-dependent photoluminescence spectra and theoretical calculation, which suggests that (t-BA) 2 Cu 2 I 4 ·H 2 O has a more localized charge distribution and sufficient polyhedral distortion, resulting in a bright and efficient emission from self-trapped excitons. This is the first report of water-induced luminescence in copper-based metal halides, and it paves the way for stable luminescent materials that are responsive to humidity.
研究领域:
材料化学
·
光物理学
·
无机化学
·
功能材料
·
发光材料
✓ 已验证
DOI
高影响因子
TETRAHEDRON
·
2019
·Vol. 75
·期 31
·4174-4179
·
IF 2.379
Yingying Zuo,Feng Xiong,Jing Zhao
Organic sulfur compounds have broad applications in biology, medicine and material sciences and intensive efforts have been devoted to developing mild and general C–S bond-forming methods. However, a mild, transition-metal-free, direct C–H bond functionalization method remains elusive. Here, we report the use of an internal oxidant-directing strategy to achieve this goal. The cascade reactions described here show excellent chemoselectivity and a wide substrate scope for both oxyamines and sulfenylation reagents. This study enlarges the synthesis toolbox for preparing structurally diverse sulfilimines under mild conditions.
研究领域:
有机化学
·
合成化学
·
药物化学
·
生物医学材料
·
分子生物学
✓ 已验证
DOI
高影响因子
Journal of Chemistry
·
2021
·Vol. 2021
·期 1
·5685596
·
IF 2.506
Jia Ma,Jianer Wang,Yuping He,Yiwei Huang,Yejun Chen
Solvothermal reaction of 4,4’,4’-nitrilotribenzoic acid (H 3 TCA) with Ca(NO 3 ) 2 ·4H 2 O and Cd(NO 3 ) 2 ·4H 2 O successfully afforded a heterometallic compound, that is, [Cd 2 Ca(TCA) 2 (DMA) 2 (H 2 O) 3 ] n ·2n(DMA) ( 1 , DMA = N,N’-dimethylacetamide). The structure of 1 was further characterized through EA, diffraction of single crystal X-ray, and thermogravimetric analysis (TGA) together with powder X-ray diffraction (PXRD). Moreover, complex 1 ’s luminescent performance in solid state was also discussed at environmental temperature. The applications on the ischemic cerebral infarction therapy were evaluated, and the specific mechanism was investigated at the same time. Firstly, the hypersensitivity C-reactive protein (hs-CRP) content in human brain microvascular endothelial cell (HBMEC) was measured with real-time reverse transcription-polymerase chain reaction (RT-PCR). Then, interleukin-18 and interleukin-1 β content released through the HBMEC was detected with enzyme-linked immunosorbent assay (ELISA).
研究领域:
生物无机化学
·
神经药理学
·
炎症生物学
·
转化医学
·
分子影像学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xin Guan,Huijie Pei,Xiaoyu Chen,Chen Chang,Siyuan Shao,Yu-Mo Zhang,Xingping Zhou,Hui Nie,Xiaolin Xie
The adsorption-catalysis synergy for accelerated conversion of polysulfides is critical toward the electrochemical stability of lithium-sulfur battery (LSB). Herein, a non-metallic polymer network with anion receptor units, trifluoromethanesulfonyl (CF 3 SO 2 -) substituted aza-ether, was in-situ integrated on PE separator, working as an efficient host for anchoring lithium thiophosphates (LPS) as redox mediators and polysulfides through Lewis acid-base interaction. The anchored LPS on the modified PE separator displayed a robust chemical adsorption ability towards polysulfides through the formation of S S bond. Meanwhile, LPS decreased the energy barrier of Li 2 S nucleation and promoted redox reaction kinetics. The battery with LPS decorated separator revealed a long cycling lifespan with a per cycle decay of 0.056 % after 600 cycles, and a competitive initial capacity of 889.1 mAh/g when the of sulfur cathode increased to 3 mg cm −2 . This work developed a new design strategy to promote the utilization of lithium phosphorus sulfide compounds in LSB.
研究领域:
电化学
·
能源材料
·
纳米材料
·
界面化学
·
储能技术
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 21
·期 4
·2410657
·
IF 13
Jia Wang,De Wang,Zelin Zhao,Ganggang Chang,Wei Guo,Jun Xu,Yinyu Xiang,Junrui Li,Junsheng Li
Developing cost-effective ruthenium (Ru)-based HER electrocatalysts as alternatives to commercial Pt/C is crucial for the advancement of proton exchange membrane water electrolysis (PEMWE). However, the strong hydrogen adsorption of Ru-based catalysts restricts its activity. Herein, a strategy is reported to tune the electronic structure and improve mass transfer by implanting Ru atoms onto the (002) facet of two-dimensional zeolitic imidazolate framework-67 (Ru@ L ZIF (002) ) to optimize the d -band center ( ε d ) of Ru and the hydrogen spillover behavior. Benefiting from the ultrathin nanosheet structure and optimized ε d of Ru, the over-strong H adsorption energy is weakened and the electron/mass transfer is facilitated. Ru@ L ZIF (002) exhibits an overpotential of 9.2 mV at 10 mA cm −2 and a long-lasting stability of 35 days at 100 mA cm −2 . The mass activity and price activity of Ru@ L ZIF (002) is 2.9 and 14.7 times higher than Pt/C, respectively. More impressively, Ru@ L ZIF (002) delivers a cell voltage of 2.01 V at a high current density of 4 A cm −2 in PEMWE. The excellent long-term durability of 1200 hours operating at 4 A cm −2 with an ultralow decay rate of 7.5 × 10 −3 mV h −1 has been achieved, making it promising as a cost-effective alternative to Pt/C catalyst for PEMWE applications.
研究领域:
电催化
·
材料科学
·
能源化学
·
纳米材料
·
电化学工程
·
可持续能源技术
✓ 已验证
DOI
高影响因子
Acta Biomaterialia
·
2021
·
IF 8.947
Xian Tong,Wenhao Cai,Jixing Lin,Kun Wang,Lufan Jin,Zimu Shi,Dechuang Zhang,Jianguo Lin,Yuncang Li,Matthew Dargusch,Cuie Wen
Zinc (Zn)-based alloys have been considered potential biodegradable materials for medical applications due to their good biodegradability and biocompatibility. However, the insufficient mechanical properties of pure Zn do not meet the requirements of biodegradable implants. In this study, we have developed a biodegradable Zn−3Mg−0.7Mg 2 Si composite fabricated by high-pressure solidification. Microstructural characterization revealed that the high-pressure solidified (HPS) composite exhibited uniformly distributed fine MgZn 2 granules in an α-Zn matrix. Comprehensive tests indicated that the HPS composite exhibited exceptionally high compression properties including a compressive yield strength of 406.2 MPa, an ultimate compressive strength of 1181.2 MPa, and plastic deformation up to 60% strain without cracking or fracturing. Potentiodynamic polarization tests revealed that the HPS composite showed a corrosion potential of −0.930 V, a corrosion current density of 3.5 μA/cm 2 , and a corrosion rate of 46.2 μm/y. Immersion tests revealed that the degradation rate of the HPS composite after immersion in Hanks’ solution for 1 month and 3 months was 42.8 μm/y and 37.8 μm/y, respectively. Furthermore, an extract of the HPS composite exhibited good cytocompatibility compared with as-cast (AC) pure Zn and an AC composite at a concentration of ≤25%. These results suggest that the HPS Zn−3Mg−0.7Mg 2 Si composite can be anticipated as a promising biodegradable material for orthopedic applications .
研究领域:
生物医学工程
·
材料科学
·
生物材料
·
骨科
·
可降解金属
·
组织工程
·
腐蚀科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 43
·21569-21577
·
IF 7.443
Zhaoqiang Li,Longwei Yin
A sandwich-like structure with reduced graphene oxide (RGO) wrapped MOF-derived ZnCo2O4–ZnO–C polyhedrons on nickel foam as an anode for high performance lithium ion batteries (LIBs) is for the first time reported via simply growing MOFs on Ni foam, and wrapping graphene oxide nanosheets on MOFs, and then annealing under a N2 atmosphere. It should be noted that the MOF-derived porous products are composed of carbon-coated spinel ZnCo2O4–ZnO nanoparticle polyhedrons. When tested as anodes for LIBs, the unique RGO/ZnCo2O4–ZnO–C/Ni sandwich-structured LIB anodes exhibit superior coulombic efficiency, excellent cycling stability and rate capability. The in situ formed carbon layers outside the ZnCo2O4–ZnO act as not only a conductive substrate but also a buffer layer for volume changes. The open pores in ZnCo2O4–ZnO–C polyhedrons provide sufficient electrolyte as well as serve as cushion space to further alleviate volume changes. The RGO nanosheets act as a flexible protector to firmly fix polyhedrons on the Ni foam, as well as a conductive substrate to wire up all the polyhedrons. The interconnected carbon layers and two high conductive substrates (RGO and Ni foam) together form an unhindered highway for charge transfer during discharge/charge processes, promising good electrochemical performance.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
功能材料
·
固态化学
·
电极工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Haoyu Gu,Tong Lv,Qiankun Zhang,Dequan Chi,Yang Zhang,Zhongjun Cheng,Zhimin Xie,Yongjun Xu,Dongjie Zhang,Yuyan Liu
Smart reconfigurable metamaterials can better adapt to changing electromagnetic environments and broaden the range of applications. However, constructing electromagnetic reconfigurable metamaterials, especially those with large areas or applied to complex surfaces via a universal approach, is still a challenge. Here, we introduce a smart reconfigurable metamaterial consisting of a thermadapt shape memory polymer ethylene vinyl acetate copolymer (EVA) matrix and a flowable liquid–metal resonant unit. Based on the excellent self-healing properties of EVA, large-area metamaterials can be constructed by thermal assembly of metamaterial units. In addition, the original shape of the metamaterial can be reprogrammed to apply to complex three-dimensional surfaces with the reprocessing properties of EVA. Moreover, by utilizing the shape memory performance of the EVA, the temporary resonant frequency of the metamaterial can be set by programming and the resonant frequency tuning of the metamaterial can be controlled under external temperature stimulation, achieving noncontact tuning. In the future, this concept can be broadly applied in fields such as complex structure stealth layers and multifunction filters.
研究领域:
材料科学
·
电磁学
·
高分子化学
·
智能材料
·
功能材料
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2021
·Vol. 65
·期 1
·43-50
·
IF 8.273
Xu Jingyi,Lai Chenling,Duan LiPing,Zhang Yuxuan,Xu Yifan,Bao Jianchun,Zhou Xiaosi
Transition-metal compounds have received extensive attention from researchers due to their high reversible capacity and suitable voltage platform as potassium-ion battery anodes. However, these materials commonly feature a poor conductivity and a large volume expansion, thus leading to underdeveloped rate capability and cyclic stability. Herein, we successfully encapsulated ultrafine CoP and CoSb nanoparticles into rich N-doped carbon nanofibers (NCFs) via electrospinning, carbonization, and phosphorization (antimonization). The N-doped carbon fiber prevents the aggregation of nanoparticles, buffers the volume expansion of CoP and CoSb during charging and discharging, and improves the conductivity of the composite material. As a result, the CoP/NCF anode exhibits excellent potassium-ion storage performance, including an outstanding reversible capacity of 335 mA h g −1 , a decent capacity retention of 79.3% after 1000 cycles at 1 A g −1 and a superior rate capability of 148 mA h g −1 at 5 A g −1 , superior to most of the reported transition-metalbased potassium-ion battery anode materials.
研究领域:
材料科学
·
电化学储能
·
纳米材料
·
能源化学
·
功能纤维材料
·
先进电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2012
·Vol. 50
·期 24
·5177-5184
·
IF 3.919
Yonggang Gao,Lin Gu,Yusheng Qin,Xianhong Wang,Fosong Wang
Low-molecular weight oligo(carbonate-ether) diols are important raw materials for polyurethane formation, which with tunable carbonate unit content (CU) may endow new thermal and mechanical performances to polyurethane. Herein, facile synthesis of oligo(carbonate-ether) diols with number average molecular weight ( M n ) below 2000 g mol −1 and CU tunable between 40% and 75% are realized in high activity by immortal copolymerization of CO 2 /propylene oxide (PO) using zinc-cobalt double metal cyanide complex (Zn-Co-DMCC) in the presence of sebacic acid (SA). M n of the oligomer is in good linear relationship to the mole ratio of PO and SA (PO/SA) and hence can be precisely controlled by adjusting PO/SA. Besides, the molecular weight distribution is quite narrow due to the rapid reversible chain transfer in the immortal copolymerization. High pressure and low temperature are favorable for raising CU. In all the reactions, the weight fraction of propylene carbonate ( W PC ) can even be controlled as low as 2.0 wt %, and the catalytic activity of Zn-Co-DMCC is above 1.0 kgg −1 cat. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
研究领域:
高分子化学
·
催化化学
·
绿色化学
·
功能材料
·
聚合物合成
·
二氧化碳利用
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）