JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Jun Guo,Yu-Ke Zhu,Lin Chen,Zi-Yuan Wang,Zhen-Hua Ge,Jing Feng
Bi 2 S 3 -based alloys are considered promising thermoelectric materials due to their large Seebeck coefficient and low lattice thermal conductivity . However, low electrical conductivity usually leads to poor electrical transport properties, which seriously restricts their further application in thermoelectric refrigeration and/or power generation. In this work, Bi 2 S 3 with high electrical transport properties is synthesized hydrothermally via Se and Cl co-doping. The maximum electrical conductivity value of 483 S cm −1 was obtained for the Bi 2 S 2.4 Se 0.4 Cl 0.20 sample at room temperature. The significant improvement of electrical conductivity gives rise to a high average power factor of 411 μW m −1 K −2 during the measuring temperature range and a peak value of 456 μW m −1 K −2 at 673 K. Benefiting from the largely improved electrical transport properties, a superior ZT value of approximately 0.66 and ZT ave . of 0.36 were obtained for Bi 2 S 2.4 Se 0.4 Cl 0.20 , and the theoretically calculated conversion efficiency reached 5.7%. The results indicate that Bi 2 S 3 is a promising candidate for thermoelectric applications at medium temperatures.
研究领域:
材料科学
·
热电学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2014
·
IF 0
Ye Chuan Chen,Guang Yang,Rui Zhao,Wei Dong Xue
Silicon nanoparticles have extraordinary electrochemical performance for lithium-ion batteries. This paper gives an improved low temperature solution synthesis route of Si NPs. Reduced by magnesium and then passivated by four kinds of amines/amides respectively, stable yellow Si NPs ranging from 5-50 nm were prepared. When passivated by N-methyl-2-pyrrolidone, grape-like aggregation of 5-20 nm particles were generated. FTIR, XRD, SEM and Electrochemical Characterization were performed to confirm the product. The Si NPs passivated by NMP achieve good electrochemical performance with a first discharge capacity of 1154 mAhg-1 at a current density of 200 mAg-1 and good capacity retention of 95.3% after 5 cycles.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
Journal of the American Chemical Society
·
2020
·
IF 14.612
Huan Yang,Fang Wang,Huisheng Zhang,Lihong Guo,Liyan Hu,Lanfang Wang,Ding-Jiang Xue,Xiaohong Xu
CrGeTe3 has recently emerged as a new class of two-dimensional (2D) materials due to its intrinsic long-range ferromagnetic order. However, almost all the reported synthesis methods for CrGeTe3 nanosheets are based on the conventional mechanical exfoliation from single-crystalline CrGeTe3, which is prepared by the complicated self-flux technique. Here we report a solution-processed synthesis of CrGeTe3 nanosheets from a non-van der Waals (vdW) Cr2Te3 template. This structure evolution from non-vdW to vdW is originated from the substitution of Ge atoms on the Cr sites surrounded by fewer Te atoms in the Cr2Te3 lattice due to their smaller steric hindrance and lower energy barrier. These CrGeTe3 nanosheets present regular hexagonal structures with a diameter larger than 1 μm and excellent stability. They exhibit soft magnetic behavior with a Curie temperature lower than 67.5 K. This non-vdW to vdW synthesis strategy promotes the development of CrGeTe3 in ferromagnetism while providing an effective route to synthesize other 2D materials.
研究领域:
材料科学
·
物理化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 15
·期 40
·8159-8165
·
IF 3.879
Yafang Zhang,Guangfang Li,Huiping Zhao,Fan Tian,Shengqiang Xiao,Rong Chen
Hierarchical Bi2CuO4 microspheres constructed with 2D rod-like or cube-like nanostructures were successfully prepared via a facile hydrothermal process in aqueous solution. It was found that potassium hydroxide (KOH) and polyvinylpyrrolidone (PVP) had a significant influence on the structure and size of the Bi2CuO4 microspheres. The photocatalytic activities of the prepared Bi2CuO4 microspheres were determined by the degradation of Rhodamine B (RhB) under visible light irradiation. The results revealed that the hierarchical Bi2CuO4 microspheres exhibited a remarkable visible-light-driven photocatalytic performance. The photocatalytic activities of the Bi2CuO4 microspheres were also strongly related to their structure and size. More importantly, Bi2CuO4 microspheres with small sizes and loose structures displayed superior photocatalytic activity to that of commercial P25.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Yun-Qiao Tang,Zhen-Hua Ge,Yue-Xing Chen,Peng Qin,Jing Feng,Jiaqing He
Cu-Se compounds have attracted more attentions as a low-cost, low toxicity thermoelectric materials. In this work, p-type Cu 2 Se x compound powders were prepared by solution syntheses, including the wet chemistry method and hydrothermal synthesis method. The reaction mechanisms were investigated, showing that the NaOH contents affected the phase structure of the final product. Polycrystalline Cu 2 Se x bulk materials were obtained by densifying the powders using spark plasma sintering (SPS) and obtained the maximum ZT value of 0.75 at 623 K, which is currently the highest reported value for the Cu-Se system at this temperature. We also found that the introduced oxides could suppress the long-range migration of Cu ions in Cu-Se system to avoid the decomposition of the materials.
研究领域:
材料科学
·
热电材料
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-7
·
IF 3.125
Wang Fei,Zi Wenwen,Zhao Bao Xun,Du Hong Bin
Red phosphorus (RP) has attracted extensive attention as an anodic material for lithium-ion batteries (LIBs) due to its high theoretical specific capacity of 2596 mA h g − 1 and earth abundance. However, the facile and large-scale preparation of the red phosphorus nanomaterials via a solution synthesis remains a challenge. Herein, we develop a simple and facile solution method to prepare red phosphorus nanoparticles (RP NPs). PCl 3 readily reacts with HSiCl 3 in the presence of amines at room temperature to produce amorphous RP NPs with sizes about 100–200 nm in high yields. When used as an anode for rechargeable lithium ion battery, the RP NP electrode exhibits good electrochemical performance with a reversible capacity of 1380 mA h g − 1 after 100 cycles at a current density of 100 mA g − 1 , and Coulombic efficiencies reaching almost 100% for each cycle. The study shows that this solution synthesis is a facile and convenient approach for large-scale production of RP NP materials for use in high-performance Li-ion batteries.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 22
·期 2
·178-183
·
IF 3.382
Xiaozhen Hu,Xueyang Wang,Shendong Zhuang,Jianqiang Xu
A facile solution strategy to synthesize large-sized CsPbCl3 crystals was reported and uniform micrometer-sized crystals were successfully synthesized in several minutes. Interestingly, the crystals were found to exhibit polarization sensitive properties, with a polarization anisotropic ratio of 3, which was higher than that of aligned perovskite nanowire arrays (2.6).
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2012
·Vol. 14
·期 20
·7049-7054
·
IF 3.842
Weiwei Hu,Hui Liu,Feng Ye,Yulong Ding,Jun Yang
A key frontier in nanomaterial fabrication is the integration of different materials within the same structure as a means to increase functionality. Herein, a facile solution route for the synthesis of nanocomposites consisting of PbSe and gold is reported. It has been found that the molar ratio of PbSe/Au has great influence on the morphologies of the PbSe–Au nanocomposites. The evolution from nanocomposites with multiple Au deposition on the particle surface to those with a single Au domain, and further to pineapple-like morphologies has been illustrated by increasing the molar ratio of Au/PbSe during the synthesis. Surprisingly, the experimental observations show that the growth of Au on the surface of PbSe has an upper limit size. Upon the achievement of this size, addition of more Au precursors only results in the deposition of Au on extra sites over the surface of PbSe instead of continuous growth of the Au domain, termed ‘pineapple-like’ nanocomposites. This thereby extends an opportunity for the fabrication and control of nanostructures, in particular for nanocrystals composed of different materials.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 4
·1-9
·
IF 2.175
Jia Li-Ping,Yan Bing,Zhang Qiang
A high temperature solution system with BaCO 3 /RECl 3 ·xH 2 O in oleic acid/1-octadecene has been developed to prepare barium rare earth fluoride nanocrystals: tetragonal phase of BaREF 5 (RE = Pr, Nd, Eu, Tb, Dy, Tm, Lu, Y), pure cubic phase Ba 2 REF 7 (RE = La, Sm, Ho, Er, Yb), and BaREF 5 (RE = Ce, Gd) colloidal nanocrystals. In addition, it is proved that the functionalization of these nanocrystals by means of doping with Eu, Tb, and Yb, Er/Tm ion pair can obtain red, green, and visible-to-the-naked-eye green/blue upconversion emissions.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Kewei Gu,Tingting Wang,Guowei Yang,Nan Yu,Chengchao Du,Junli Wang
Two-dimensional inorganic–organic hybrid layered semiconductors are actively studied because of their naturally formed multiquantum well (MQW) structures and associated optical, photoelectric, and quantum optics characteristics. Silver benzeneselenolate (AgSePh, Ph = C6H5) is a new member of such hybrid layered materials, but has not fully been exploited. Herein, we present a quasi-solution method to prepare high quality free-standing AgSePh flake-like microcrystals by reacting diphenyl diselenide (Ph2Se2) with silver nanoparticles. The resultant AgSePh microflakes exhibit room-temperature (RT) resolvable MQW-induced quasi-particle quantization and interesting optical properties, such as three distinct excitonic resonance absorptions X1 (2.67 eV), X2 (2.71 eV), and X3 (2.83 eV) in the visible region, strong narrow-line width blue photoluminescence at ∼2.64 eV (470 nm) from the radiative recombination of the X1 exciton state, and a large exciton binding energy (∼0.35 eV). Furthermore, AgSePh microcrystals show high stability under water, oxygen, and heat environments, while above 220 °C, they will thermally decompose to silver and Ph2Se2 as evidenced by a combination of thermogravimetry and differential scanning calorimetry and pyrolysis-coupled gas chromatography–mass spectrometry studies. Finally, a comparison is extended between AgSePh and other metal benzeneselenolates, benzenethiolates, and alkanethiolates to clarify differences in their solubility, decomposition/melting temperature, and pyrolytic products.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hengyang Wang,Xiaofang Liu,Bin Zhang,Lisi Huang,Meiling Yang,Xiang Zhang,Hong Zhang,Guoyu Wang,Xiaoyuan Zhou,Guang Han
Binary silver chalcogenides (Ag 2 X, X = S, Se, Te) are a group of intriguing thermoelectric materials. When utilised for thermoelectrics, however, the syntheses of these chalcogenides commonly require energy-intensive, high-temperature melting-annealing processes. Herein, we have developed a general surfactant-free and scalable solution synthesis strategy to nano/micro-particles of binary silver chalcogenides, which requires neither high temperature nor long reaction duration. The chalcogenide particles were spark plasma sintered into pellets with porous structures. By modifying the Ag + /X 2− molar ratios in the solution precursors from 2:1 to 2:1.1, the thermoelectric properties of the pellets have been effectively optimised, leading to maximum ZT values of 0.84 at 380 K for Ag 2 Se, 0.59 at 650 K for Ag 2 Te and 0.27 at 540 K for Ag 2 S that are comparable to those of samples fabricated by other synthetic methods, such as melting and annealing. This study provides a general surfactant-free solution approach to binary silver chalcogenide nano/micro-materials with tuneable thermoelectric properties.
研究领域:
材料科学
·
热电材料
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2014
·
IF 1.968
Li-Ping Jia,Bing Yan
RE–Fe–B–Na (RE = Nd–Er) colloidal nanoparticles are prepared by high-temperature solution synthesis. These nanoparticles are ultra-small monodisperse, air-stable and amorphous, whose particle size and magnetic property are characterized by transmission electron microscope and superconducting quantum interference device. Taking Nd–Fe–B–Na nanoparticle as an example, it is found that the particle size can be controlled in less than 7 nm. Besides, the magnetic properties of RE–Fe–B–Na colloidal nanoparticles can be compared for different rare earth elements. Based on the bulk ferromagnetic coupling, other possible magnetic coupling mechanism is discussed.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）