INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Konglan Chen,Shiyu Jia,Xueliang Zhang,Zifan Shao,Yayun Zhou,Ting Fan,Ting Yu,Tingting Deng
Development of highly thermally stable broadband near-infrared (NIR) luminescence materials is crucial for advancing the prolonged stable application of smart NIR light sources. In this study, a zero-thermal-quenching and reversible temperature-dependent broadband NIR-emitting Cs2NaAl3F12:Cr3+ phosphor is demonstrated, benefiting from its stable polyhedron-cluster-building rigid structure. The excellent thermal stability of Cs2NaAl3F12:Cr3+ is rooted in its stable [Al6Na4F45] cluster building unit, which provides a rigid structure with a weak electron–phonon coupling effect and a wide band gap with a huge thermal activated barrier. Such characteristics are well revealed by multiple studies on crystal structure, electronic structure, Huang–Rhys factor S, configuration coordinate model, and Debye temperature. The incorporation of Li or K instead of Na weakens the luminescence thermal stability, directly proving the importance of the stable [Al6Na4F45] cluster for stable Cr3+ substitution and rigid structure construction. Furthermore, Cs2NaAl3F12:Cr3+ presents much superior thermal stability compared to traditional rigid garnet-type fluorides Na3X2Li3F12:Cr3+ (X = Al, Ga, In). A high-power NIR LED is presented, utilizing the high quantum efficiency (∼71%) and extremely thermally stable broadband NIR emission around 750 nm of Cs2NaAl3F12:Cr3+. It realizes clear vein and cartilage imaging in the human hand, demonstrating its potential in medical diagnosis applications. This result provides important insights for designing new-type rigid crystal structures using stable polyhedron clusters as basic units, advancing the development of highly thermally stable NIR-emitting phosphors.
研究领域:
材料科学
·
光学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Qingtao Wang,Xun Wei,Yanxia Wu,Guofu Ma,Ziqiang Lei,Shufang Ren
Electrocatalysts are useful in lowering the energy barrier in oxygen reduction reaction (ORR). In this study, a catalyst with neighboring Fe single-atom and cluster is created by adsorbing a bimetallic Fe complex onto N -doped carbon and then pyrolyzing it. The resulting catalyst has good performance and a half-wave potential of 0.89 V. When used in Zn-air batteries, the voltage drops by only 8.13 % after 145 h of cycling. Theoretical studies show that electrons transfer from neighboring clusters to single atoms and the catalyst has a lower d-band center. These reduce intermediate desorption energy, hence improving ORR performance. This work demonstrates the capacity to adjust the catalytic properties through the interaction of diverse metal structures, which helps to design more efficient catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Colloid and Interface Science Communications
·
2020
·
IF 2.831
Qianhui Hua,Yanwei Zeng,Zihao He,Qunjie Xu,Yulin Min
In this paper, a chitosan‑tin oxide composite film (CTOF) composed of clusters of micro-flowers was prepared on aluminum alloy to improve corrosion protection in the 0.1 M H 2 SO 4 and 0.001 M NaF acidic solution by the hydrothermal method . The surface morphology of the film was analyzed by scanning electron microscopy (SEM). The structure and ingredient of the film were research by using X-Ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR). The method we used is very simple, convenient and pollution-free. The film shows good protective efficiency as high as 99.998% in solution of 0.1 M H 2 SO 4 and 0.001 M NaF which indicates that the films can improve corrosion resistance of aluminum alloy under acidic solution.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yingying Dou,Chengjiao Wu,Yue Fan,Yingke Wang,Zhe Sun,Shilin Huang,Yabin Yang,Xuelin Tian
Transparent protective coatings capable of preventing fog and dust accumulation have broad application prospect in photovoltaic systems , optical devices and consumer electronics. Although a number of superhydrophobic coatings have been developed for self-cleaning purpose over the past three decades, there is still a lack of surfaces that can simultaneously possess high transparency, remarkable superhydrophobicity, and excellent fog and dust resistance. In this study, we have prepared surfaces featuring sub-wavelength nanofiber cluster structures through a facile plasma etching method, and further modified the surface with liquid-like perfluoropolyether (PFPE) brushes. The prepared PFPE modified nanofibrous surface (PFPE-NS) exhibits superior optical transparency (transmittance 90.4 % ± 0.7 %) and water repellency , with a water contact angle as high as 171.0° ± 0.6° and sliding angle down to 0.5° ± 0.1° (5 µL). More importantly, benefitted from the nanofiber cluster structures and the slippery liquid-like surface chemistry, the adhesion and accumulation of fog droplets and dust particles on PFPE-NS is greatly inhibited. As a consequence, PFPE-NS can keep excellent optical clearness after 2 h fogging test and maintain an average transmittance above 87 % after 24 h dusting test. Our study provides a promising strategy through constructing liquid-like nanofibrous coating for optical protection that could be applicable in practical rainy, foggy, and dusty environments.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2024
·Vol. 8
·期 10
·2282-2292
·
IF 6
Congcong Lu,Yu Yang,Songjun Li,Maiyong Zhu
Because of their superior power and energy densities, supercapacitors have garnered considerable amounts of attention in energy storage technologies. Co3O4 is considered as a regularly used electrode material for supercapacitors because of its high theoretical capacitance and outstanding electrochemical activity. However, owing to the Co3O4 electrode materials’ rapid capacity decay and low intrinsic conductivity, it is challenging to achieve high theoretical capacitance. As a result, doping Co3O4 with metal components can enhance its electrical and surface characteristics while also raising its conductivity. Through a straightforward hydrothermal reaction and subsequent thermal decomposition, a series of Fe doping into Co3O4 has been successfully realized in this paper. This generates a nanosheet floral cluster structure and exposes more active sites, and the two metal elements work in concert to improve the capacitance performance. The electrochemical performance of the Co-0.2Fe-450 electrode material appears satisfactory when the doping amount of Fe is 0.2 mmol and its thermal decomposition temperature is 450 °C. The specific capacitance at 1 A g−1 is 680 F g−1. The capacitance retention rate at 10 A g−1 current density after 5000 charge–discharge cycles is 84.67%. Notably, the assembled asymmetric supercapacitor retains 105.5% of its capacitance after 5000 cycles and has a power density of 803.13 W kg−1 and an energy density of 17.78 W h kg−1. Fe-doped Co3O4 has a strong future in energy storage, as evidenced by its exceptional electrochemical characteristics.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 33
·e52785
·
IF 3.057
Bingjian Li,Shi Liu,Xixi Xu,Haicun Yang,Yinjie Zhou,Dan Yang,Yun Zhang,Jinchun Li
The continuously reinforced carbon nanotube woven film (CNWF) prepared via the floating catalytic chemical vapor deposition (FCCVD) was modified by mixed acid and vinyltrimethoxysilane (VTMS) respectively to obtain carbon nanotube woven film (CNWF@VTMS) grafted with CH 2 CH group. A series of novel self-supporting composite electrode materials (CNWF@VTMS/PANI) for supercapacitors were then prepared by in-situ chemical oxidative polymerization of aniline in the presence of the CNWF@VTMS film substrate as a conductive network framework. The results showed that CNWF@VTMS/PANI 14 flexible electrode with grape-clustered structure exhibited the highest specific capacitance of 531.3 F/g and the highest energy density of 26.5 Wh/kg at the current density of 1 A/g. It could maintain 75.1% of the initial value at a high current density of 10 A/g. The excellent electrochemical cycle and the structural stability have been confirmed on the condition of the higher capacitance retention of 96.6% after 2000 times of galvanostatic charge/discharge, and the almost unchanged electrochemical performances after 300 times of bending and twisting. Meanwhile, the stronger interfacial bonding between CNWF and PANI endowed a higher tensile strength of 129.2 MPa. In this article, CNWF@VTMS/PANI 14 composite electrode could be a potential application in the field of deformable supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Xu Zhang,Zixuan Fan,Wentao Xu,Qin Meng,Chong Shen,Guoliang Zhang,Congjie Gao
In this study, novel thin film composite (TFC) nanofiltration membrane with nanocluster structure was successfully synthesized by confining interfacial polymerization (IP) on graphene oxide/metal-polyphenol (GO/TA-M n+ ) nanonetwork scaffold interlayer for the first time. By metal-polyphenol network coordination cross-linking, very stable GO/TA-M n + nanonetwork scaffold was constructed via brush coating, which well-regulated the pore structure and distribution of the substrate, greatly restricting the invasion of polyamide (PA) matrix to the pore of substrate. Moreover, the GO/TA-M n + modified substrate effectively mediated the amine monomers diffusion during interfacial polymerization, contributing to form an ultrathin PA layer (∼19.2 nm) with nanocluster structure. The separation performance therefore can feasibly be tuned by the metal ions of different valence states. The strategy also gives appropriate level of generality for synthesis of versatile defect-free TFC membranes on various substrates. The prepared TFC-GO/TA-Al 3+ membrane held outstanding separation performance with water permeability of 16.87 L m −2 h −1 bar −1 and competitive rejection of 97.2% for Na 2 SO 4 , displaying the permeability increment of about 4.5 times without sacrificing salt rejection.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2018
·Vol. 5
·期 6
·1415-1422
·
IF 5.106
Ailijiang Abudurusuli,Kui Wu,Yilimiranmu Rouzhahong,Zhihua Yang,Shilie Pan
Four new quaternary chalcogenides with the formula of Na6Zn3MIII2Q9 (MIII = Ga, In; Q = S, Se) have been successfully synthesized for the first time. They are isostructural and crystallize in the monoclinic C2/c space group. As seen from their structures, they exhibit two opposite direction layers composed of the interconnection of countless (Zn/MIII)10Q20 supertetrahedra (T3-type) clusters, and then three coordination-type NaQn units (n = 4–6) exist among the interlayers to bridge them together. Note that these T3 clusters connect with each other by vertex-sharing to form the layers in the title compounds, which can be viewed as the first discovered examples in the known quaternary chalcogenides that only exhibit the tetrahedron-sharing T3 clusters. Moreover, we have also systematically compared the structural differences of all the T3-containing quaternary chalcogenides and the result shows that the title compounds possess the shortest interlayer spacing and more tilting T3 cluster-built layers in comparison with other related compounds. The measured optical properties indicate that their optical bandgaps are in the range from 2.22 to 3.15 eV, respectively. The photoluminescence result shows that the title compounds have potential application prospects as blue and green light emitters in view of their obvious emission peaks centered at 463 and 541 nm. Electronic structures and density of states were also calculated by first-principles calculations and the results indicate that their optical bandgaps are mainly determined by the T3 clusters.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）