DALTON TRANSACTIONS
·
2021
·Vol. 51
·期 3
·904-909
·
IF 4.39
Chang Liu,He-Di Yang,Pei-Pei Hou,Yu Xiao,Yi Liu,Hua Lin
Inorganic chalcogenides containing cations with lone-pair electrons have attracted considerable attention because of their potential applications in photocatalysis. In this research, two new copper thioarsenates with the lowest Cu-to-As ratio in the quaternary X/Cu/As/Q (X = inorganic cations; Q = chalcogen) system, namely Cs3CuAs4Q8 (Q = S, Se), were obtained by a simple surfactant–thermal method at a low temperature. These two isostructural compounds belong to the monoclinic space group C2/c (no. 15) and are composed charge-balanced Cs+ cations and two-dimensional anionic [CuAs4Q8]3− layers. Notably, photo-electrochemical measurements indicate that Cs3CuAs4Q8 possesses a remarkable photocurrent response under simulated solar-light illumination. Further theoretical studies were performed to gain insights into the relationships between electronic structure and optical properties.
研究领域:
无机化学
·
材料科学
·
光电材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2020
·
IF 3.085
Xiaomeng Sun,Tingting Sun,Xiaofang Lu,Lianjun Wang,Wan Jiang
In recent years, organic/inorganic hybrids capture wide attention due to their advantages in endowing composites with both high Seebeck coefficient and low thermal conductivity originating from inorganics and polymer, respectively. However, simply blending tend to weaken this advantage, resulting in lower thermoelectric performance than that of single organics or inorganics. Here we propose a polar organic solvents aided layer-by-layer (OS-LbL) technique to prepare high performance nanocomposite films comprising poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) and Sb 2 Te 3 nanocomposites. Polar organic solvents not only promote the dispersion of Sb 2 Te 3 nanoplates but also post-treat the PEDOT:PSS layer at the hetero-junction interface, successfully increasing the electrical conductivity and thermopower at the same time. Besides, the organic/inorganic interface inducing by OS-LbL promotes a low thermal conductivity of 0.0522 Wm −1 K −1 . As a result, a maximum ZT value up to 0.10 at room temperature. The results show that using OS-LbL method to combine PEDOT:PSS with Sb 2 Te 3 nanoplates is a promising pathway to achieve polymer-based, high-performance thermoelectric applications.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2022
·
IF 3.574
Shuimiao Xia,Zhicheng Shi,Liang Sun,Shengbiao Sun,Davoud Dastan,Runhua Fan
High dielectric materials are widely used in electronic devices, but their applications are severely hindered by the high loss and low breakdown strength. Herein, a layered structure is designed to effectively suppress the loss and enhance the breakdown strength of high dielectric materials. In the design, the high dielectric films are stacked with linear dielectric films, which can not only form breakdown barriers between adjacent layers but also reduce the leakage conduction loss. As a result, an obvious suppression of loss from 0.13 to 0.05 at 100 Hz, along with a significant increase of breakdown strength from 138 kV/mm to 413 kV/mm, are successfully achieved.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2018
·Vol. 31
·期 3
·422-427
·
IF 2.851
Xue Lou,Li-quan Zhang,Qing-hui Liu,Ying-hui Wang,Lian-Fei Yao,Yan-ting Wang,Zhi-hui Kang,Qiang Zhou,Han-Zhuang Zhang
The performance of nano-sensor based on MoS 2 nanosheet mixed with Au particle is tested based electrochemical test involving cyclic voltammogram and impedance spectroscopy, where the Fe III (CN) 6 3− /Fe II (CN) 6 4− and dopamine (DA) are chosen as research object to verify the role of layer number of MoS 2 nanosheet and the temperature. The electrochemical test shows the Au nanoparticle would improve the electron exchange reaction occurring on the electrode. In the solution of Fe III (CN) 6 3− /Fe II (CN) 6 4− , the electrode reaction follows , where increasing the layer number of MoS 2 nanosheet would restrict the reaction. In the DA system, the reaction of occurs on the electrode and increasing the layer number of MoS 2 nanosheet would facilitate the reaction. The difference as mentioned above is assigned to the energy level shift originated from variance of layer number of MoS 2 nanosheet and the changing of reaction mechanism. In addition, temperature would mainly facilitate the kinetics of electron exchange reaction, which is assigned to the diffusion acceleration of DA molecule. Simultaneously, the desorption process of reactant in the electrolyte would enhance. The role of layer number of MoS 2 nanosheet and the temperature is clarified with the thermodynamic and kinetic properties of electron exchange reaction based on MoS 2 nanosheet, which would improve the understanding of nano-sensor based on MoS 2 nanosheet.
研究领域:
材料科学
·
电化学
·
生物传感
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Mao-Cheng Liu,Bin-Mei Zhang,Yu-Shan Zhang,Yu-Xia Hu
Ti3C2 has been considered as a potential material for lithium-ion storage because of its abundant surface terminals, excellent metal-like conductivity, and modifiable layered structure. However, the Li+ diffusion rate in interlayer is limited by the small interlayer spacing determined by the van der Waals forces. Herein, the dehydration condensation reaction between amino-functionalized Ti3C2 (Ti3C2-NH2) and maleic acid (MA) molecules was utilized to enlarge the interlayer spacing of Ti3C2. The MA molecules were successfully welded into interlayers of Ti3C2 by HN–C═O bonds (namely, chemical welding) and MA chemical welded Ti3C2 (MA-Ti3C2) with self-adaption layered structure were obtained. The MA molecules can contribute double effects to the layered structure of Ti3C2, and they act as chains to remit the volume change during Li+ insertion and serve as pillars to enhance the structure stability during Li+ extraction. The MA-Ti3C2 exhibits an interlayer spacing of 1.28 nm, a fast Li+ diffusion rate (1.4 × 10–8 to 5.8 × 10–7 cm2 s–1), and improved Li+ storage performance. The MA-Ti3C2//AC lithium-ion capacitor (LIC) demonstrates an excellent energy density of 102.5 Wh kg–1 at 200 W kg–1 and cycle stability with 76.3% at 1.0 A g–1 after 1000 cycles. This novel chemical welding delivers an effective perspective for modifying the layered structure, enhancing the structure stability, and achieving fast Li+ diffusion and high-rate capability of two-dimension materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 15
·期 1
·6
·
IF 4.4
Chuanxin Weng,Junzhe He,Jiangxiao Tian,Wei Wu,Jinjin Li,Jiulin Zhang,Haitao Yu,Xuechuan Zhang,Mingming Lu
The disordered assembly and low conductivity of carbon nanotubes are the main problems that limit the application of electromagnetic interference (EMI) shielding. In this work, an ordered lamellar assembly structure of multiwalled carbon nanotube/Ti3C2Tx(MWCNT/Ti3C2Tx) hybrid films was achieved by vacuum-assisted filtration through the hybridization of Ti3C2Txnanosheets and carbon nanotubes, where carbon nanotubes were tightly sticking on the surface of Ti3C2Txnanosheets via physical adsorption and hydrogen bonding. Compared with the pure carbon nanotubes films, the hybrid MWCNT/Ti3C2Txfilms achieved a significant improvement in conductivity of 452.5 S/cm and EMI shielding effectiveness (SE) of 44.3 dB under 50 wt% Ti3C2Txwith a low thickness (8.6 μm) and orderly lamellar stacking structure, which finally resulted in high specific SE (SSE/t, SE divided by the density and thickness) of 55,603.1 dB∙cm2∙g−1.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
·
2025
·Vol. 78
·期 4
·1-11
·
IF 1.6
Chen Qijie,Liu Chencheng,Han Jiaxin,Cheng Yong,Chen Qingyun,Xiong Zhonggang
A new high-entropy MAX phase (V 0.2 Nb 0.2 Ta 0.2 Mo 0.2 W 0.2 ) 2 AlC was successfully synthesized at 1500 ℃ by nonpressure sintering one-step solid phase reaction method. The microstructure, crystal structure and oxidation behavior of high-entropy (V 0.2 Nb 0.2 Ta 0.2 Mo 0.2 W 0.2 ) 2 AlC MAX phase were investigated. Using thermogravimetry analysis to investigate the oxidative stability of (V 0.2 Nb 0.2 Ta 0.2 Mo 0.2 W 0.2 ) 2 AlC in air environment at high temperature from 0 to 1000 °C, there is no volume change from 0 to 400 °C, and the morphology still exhibits a typical layered structure, demonstrating thermal stability. Oxidation rate gradually decreases with the increase in temperature, and the K p3 value decreases to 0.86 × 10 –4 kg 2 m −4 s 2 at 1000 ℃. The microscopic morphology analysis at different temperatures shows that the surface defects of the matrix gradually form under high-temperature conditions, in which the formation of carbide and Al 2 O 3 layers hinds the further oxidation of the sample. The research provides a reference for the synthesis and thermal stability of new two-dimensional layered high-entropy MAX ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yong Qin,Ali Reza Kamali
Layer-structured calcium silicide (CaSi 2 ) is prepared using a fast and clean combustion synthesis (CS) method, employing silica as the silicon source. The CS process was characterized by the occurrence of an ignition reaction at 510 °C, leading to the formation of CaO, CaSi 2 , Ca 14 Si 19 , and Ca 3 SiO 5 which is converted into CaSi 2 with minor amounts of Si after an acid treatment. The mechanism involved in the CS process is discussed. The structure and microstructure of the CS-CaSi 2 is characterized and compared with the commercial CaSi 2 , and the outcomes are discussed based on the Ca-Si binary phase diagram. In comparison with the latter, the CS-CaSi 2 has a considerably greater purity, with loosely stacked structure, providing a surface area of around 43 m 2 g −1 . The thermal analysis of the CS-CaSi 2 is conducted under high purity argon and air flow of 100 mL min −1 , comprising differential scanning calorimetry (DSC) and thermal gravimetric (TG) analysis. The analysis conducted under argon provides evidence for the occurrence of the melting event at 1037 °C. Under air, the material is almost stable below 800 °C, while the oxidation is detected at higher temperatures. The oxidation peak of the material is realized from the corresponding DSC thermogram to take place at 1028 °C. The oxidation event is suggested to occur through two stages. At the first stage (T < 1030 °C), the event can be explained by the oxidation of calcium content of CaSi 2 . The second oxidation stage taking place at higher temperatures can be related to the oxidation of Si, with a lower rate. The Li-storage performances of the commercial CaSi 2 and CS-CaSi 2 are evaluated.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 45
·29003-29009
·
IF 4.036
Fan Sun,Zhao Liu,Jiawei Lin,Jun Deng,Zhongnan Guo,Wenxia Yuan
The magnetic semiconductor in a two-dimensional system is a major subject for both theoretical and experimental investigations. Here we report the synthesis of a new quaternary manganese chalcogenide KMnCuTe2, which shows layered structure and antiferromagnetic (AFM) semiconducting features. Single crystals of KMnCuTe2 were obtained using a self-flux method and based on single-crystal X-ray diffraction, KMnCuTe2 adopts the ThCr2Si2-type structure composed of edge-sharing tetrahedral layers separated by K+ cations. The Mn and Cu atoms randomly distribute in the centre of tetrahedral units. Attributed to the large radius of Te, KMnCuTe2 has large lattice parameters (a = 4.3115(3) Å and c = 14.9360(20) Å), leading to a long metal–metal distance (3.049 Å) in the tetrahedral layers. Based on the experiments and theoretical calculations, KMnCuTe2 exhibits a G-type AFM interaction with the transition temperature at around 225 K and an indirect semiconducting nature with the band gap of 0.95 eV. The magnetic semiconducting property of KMnCuTe2 is unique in AMnMCh2 systems (A = Li, Na, K, M = Cu, Ag and Ch = S, Se, Te), which could be associated with the large metal–metal distance. Our work not only highlights the role of metal–metal interactions on regulating the properties of ThCr2Si2-type compounds, but also provides a feasible strategy to obtain the layered magnetic semiconductor.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2019
·
IF 5.997
Leilei Huang,Yi Ding,Yajie Ma,Lei Wang,Qizhou Liu,Xinhua Lu,Yuanli Cai
Block copolymer nanoparticles have been widely used for advanced materials. However, the stabilization is challenging. Herein, we present a method for convenient yet reliable synthesis of stabilized polyion complex (PIC) nanometer-sized spheres and micrometer-sized ultrathin lamellae and vesicles by taking advantage of the wavelength orthogonality of UV-induced disulfide exchange and visible light-initiated polymerization-induced electrostatic self-assembly (PIESA). Disulfide-containing PIC vesicles are synthesized at scale using this PIESA, undergoing a small sphere-to-larger sphere-to-lamella-to-vesicle transition. As such, surface-neutralized and surface-charged micrometer-sized vesicles can be achieved. UV irradiation of the vesicles (5.0 mg/mL in water) in ambient air induces very fast exchange reaction of locally confined/enriched disulfide motifs, leading to cross-linking, shape transition, and cystamine salt release in 4 min. As such, cross-linked PIC spheres, lamellae, and vesicles can be achieved, in one pot, from one single vesicle precursor. The wavelength orthogonality is evident from disabled PIESA synthesis under UV light and ineffective postpolymerization functionalization under visible light. The cross-linked PIC spheres and micrometer-sized ultrathin lamellae and vesicles show outstanding shape/size stability and high reversibility in the solution-adaptive electrostatic hierarchical self-assembly and disassembly upon adding ethanol into aqueous dispersion and subsequent dialysis.
研究领域:
材料科学
·
化学
·
纳米技术
✓ 已验证
DOI
高影响因子
Energy & Environmental Science
·
2022
·Vol. 15
·期 4
·1682-1693
·
IF 39.714
Huili Peng,Changhui Liu,Nana Wang,Chenggang Wang,Dongdong Wang,Yanlu Li,Bo Chen,Jian Yang,Yitai Qian
Zinc anodes in aqueous batteries always suffer from severe electrochemical corrosion and terrible dendrite growth. These issues could be alleviated by using hydrophobic polymers and ion-conductive inorganics together as an artificial layer. However, inorganics without special modifications always show an inferior compatibility with hydrophobic polymers, thus leading to a loose and porous layer and a limited inhibition of side reactions. Here, monodisperse hexagonal nanoplates of α-ZrP are intercalated by n-butylamine, successfully improving the compatibility with N-methyl pyrrolidone and poly(vinyldene fluoride) usually used as a recipe for artificial layers. The obtained layer on Zn is dense and robust, thus reducing the direct exposure of Zn to electrolytes and well suppressing the side reactions. This intercalation also increases the interlayer spacing and improves the charge transfer, enriching the future selection of conductive inorganics. Hence, the electrochemical performances are much better than those of bare Zn and untreated α-ZrP. Finally, a similar enhancement is confirmed in other layered structures, demonstrating the promising prospects of this strategy.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yongshun Liang,Haiyang Liu,Ya Li,Lang Xu,Yiyao Li,Yingjiao Yang,Wei Bai,Junming Guo,Mingwu Xiang
LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM) layered oxide is recognized as a promising cathode material of lithium ions battery and generally synthesized using a co-precipitation reaction to firstly obtain hydroxide precursors following by high-temperature solid method. The co-precipitation has the relatively complex and time-consuming process, whilst showing the nonuniform lithium distribution when mixed with spherical hydroxide precursors. Herein, a facile one-step microwave method is proposed to fast synthesize various LiNi 0.5 Co 0.2 Mn 0.3-x Mg x O 2 (x ≤ 0.05) cathode materials at a microwave power of 720 W only for 5 min. And then traditional solid method is used to further enhance the crystallinity and reduce the Li + /Ni 2+ mixing of the LiNi 0.5 Co 0.2 Mn 0.3-x Mg x O 2 samples. The as-prepared LiNi 0.5 Co 0.2 Mn 0.3-x Mg x O 2 samples have analogous polyhedral morphology and uniform element distribution. Also, the substitution of appropriate Mg-doping for Mn element boosts the stable layered structure and facilitates the Li + ions diffusion. Owing to these merits, the optimized LiNi 0.5 Co 0.2 Mn 0.27 Mg 0.03 O 2 cathode material exhibits a higher capacity retention of 87.90 % than that of the pristine LiNi 0.5 Co 0.2 Mn 0.3 O 2 sample (78.12 %) after 100 cycles at 0.2C.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）