JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Liang Zheng,Wenjie Zhang,Qi Wang,Hong Zhang,Zhou Yu,Cuihua Cheng,Yong Zhang,Ming Lei,Yong Zhao
MgB 2 bulks with NaCl doping amount ranging from 0–30 at% have been prepared by hot pressed sintering process . With the increase of NaCl doping amount, the c axis lattice parameter of MgB 2 monotonously increases, indicating the substitution of Mg atoms by larger Na atoms. Meanwhile, the intensity of diffraction peaks of both NaCl and impurity phase of MgO increases. More compact morphology was found in the NaCl doped MgB 2 samples. The critical transition temperature ( T c ) decreases from 38.2 K to 36.8 K with the increase of NaCl doping amount from 0 to 30 at%, and the corresponding transition width of T c (Δ T c ) increases from 0.5 K to 1.8 K. When the doping amount of NaCl is not exceeding 10 at%, the J c value is about 10 6 A/cm 2 at 4.2 K, 3 T, and 5 × 10 5 A/cm 2 at 10 K, 3T. J c performance of the 5 at% NaCl doped MgB 2 sample (NC05) reaches 6.8 × 10 5 A/cm 2 at 20 K, 2T, which improves approximately 20% compared to the pure one, attributing to the better grain connectivity of MgB 2 and enhancement of flux pinning force by NaCl doping.
研究领域:
凝聚态物理
·
材料科学
·
超导材料
·
无机固体化学
·
功能陶瓷
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 18
·17440-17446
·
IF 2.195
Wang Tianxiong,Meng Xianquan
We try to synthesize In x Ga 1−x Sb nanowires on silicon (100) substrate using InSb and GaSb as source materials and we succeeded. Au film was used as catalysts. The experiment is simple and repeatable. The diameter of the grown nanowires is 60–200 nm and up to 10 microns in length. The grown nanowires have good crystallinity. Due to the doping of indium, we found that the XRD peaks of nanowires were shifted. We have fabricated fully nanostructured device using ultra-long Ag nanowires as electrodes for the I–V characteristic study, and found that the device has photoresponse characteristics and the I–V characteristic curve was asymmetric, we explain that it was due to the asymmetry of this fully nanostructured devices.
研究领域:
材料科学
·
纳米科技
·
半导体物理
·
固体电子学
·
晶体生长
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2017
·
IF 4.364
Puhong Wen,Lili Ai,Fenyan Wei,Dengwei Hu,Jingjing Guo,Fangyi Yao,Taotao Liu
The crystalline hexagonal Nb 2 O 5 (H-Nb 2 O 5 ) nanobelt clusters dominantly exposed (− 110) facet are firstly synthesized by a hydrothermal topological reaction with a precursor of fiber-like K 2 Nb 2 O 6 ·H 2 O. The structure and morphology of samples obtained at different temperatures and times are investigated. There are two steps in the synthesis process. One is the acid-exchanging reaction transforming into amorphous phase protonated niobate (HNO), and the other is dehydration reaction transforming into H-Nb 2 O 5 , and simultaneous dissolution reaction which forms nanobelt cluster morphology from the fiber-like particle. The formation mechanism of H-Nb 2 O 5 nanobelt clusters has been proposed in detail. After photo-reduced reaction between the H-Nb 2 O 5 nanobelt clusters and AgNO 3 solution, the dominantly exposed (− 110) facet of H-Nb 2 O 5 nanobelt is homogeneously covered by Ag nanoparticles . The photo-electrochemical performance of the obtained H-Nb 2 O 5 nanobelt clusters and Ag deposited H-Nb 2 O 5 (Ag-Nb 2 O 5 ) nanobelt clusters as photocatalysts are evaluated by splitting water under simulated sunlight illumination, and the generated photocurrent of Ag-Nb 2 O 5 sample is 10.73 μA, which is 535 times that of the H-Nb 2 O 5 sample. The results demonstrate that the Ag-Nb 2 O 5 nanobelt clusters have a high photo-electrochemical performance as well as good sunlight photoelectric conversion efficiency.
研究领域:
材料科学
·
纳米科技
·
光催化
·
能源化学
·
半导体材料
·
电化学
·
太阳能转换
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 13
·期 12
·11953-11960
·
IF 1.5
Benzhi Liu,Jinlong Yan,Min Wang,Xiangyang Wu
Molecularly imprinted polymers were prepared on the surface of acrylamide-functionalized multi-walled carbon nanotubes by thermal polymerization, which using nonylphenol as template molecule, methacrylic acid as functional monomer and ethyleneglycol dimethacrylate as crosslinking agent. The molecularly imprinted polymers were modified on the surface of glassy carbon electrode to prepare electrochemical sensor. The proposed sensor showed a linear range of 0.1 to 30 μM with a detection limit of 0.02 μM. The sensor exhibited good stability, selectivity and high sensitivity to nonylphenol detection. It was successfully applied to detect nonylphenol in water samples.
研究领域:
分析化学
·
环境监测
·
材料科学
·
电化学
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yachao Zhang,Yan Gao,Xueli Zhang,Huiming Wang,Tian Xia,Congcong Bian,Shuang Liang,Xiaozhi Tang,Xia Wang
The amplification of the electrochemical signal is crucial to improving the sensing performance of an immunosensor. In this study, a signal amplification strategy based on the co-catalysis of horseradish peroxidase (HRP) and nanoporous gold (NPG) was used to fabricate an electrochemical immunosensor for the determination of Hepatitis B e antigen (HBeAg). For the resulting immunosensor, HRP catalyzed catechol and thus served as a signal label of secondary antibody. NPG with unique properties was selected as a carrier for capture antibody immobilization. Further, NPG had an efficient electrocatalytic activity towards catechol (the substrate of HRP), which thus significantly enhanced the electrochemical signal produced by the HRP-labeled secondary antibody. Based on the co-catalysis of HRP and NPG, the immunosensor exhibited a good linear relationship between peak current density and HBeAg concentration in a wide HBeAg detection range from 1 pg mL −1 to 1 ng mL −1 with a high sensitivity of 23.51 μA mL ng −1 cm −2 as well as a low detection limit of 0.064 pg mL −1 (S/N = 3). Additionally, the immunosensor presented a strong anti-interference capability against human serum, human serum/dopamine, human serum/tryptophan, human serum/NO 2 − , human serum/D-glucose, and human serum/IgG. For the detection of HBeAg in human serum, the concentrations detected by the immunosensor were in good agreement with the standard concentrations that added in the human serum samples. These unique properties potentially make the proposed immunosensor a good choice for HBeAg detection.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2024
·
IF 7.2
Lingyan Zheng,Zhen Liu,Shuwen Xin,Qi Chen,Jinbo Ming,Liren Wu,Jiaqi Xu,Peilong Xu,Kai Liu,Ramakrishna Seeram,Fengyun Wang
A pivotal characteristic of neuromorphic systems lies in their inherent capacity for self-adaptation, facilitating environmental adaptation through the attenuation of response to repetitive stimuli. Existing electrolyte-gated synaptic transistors face challenges in simulating these self-adaptive behaviors of the brain. In this work, flexible indium zinc tin oxide (IZTO) nanowires-based synaptic transistors exhibiting self-adaptive behavior were fabricated for the first time via a facile electrospinning technique. The prepared transistors can realize typical synaptic functions by continuously modulating the conductance, including excitatory/inhibitory postsynaptic current and short/long term potentiation. These properties are well maintained even under a bending radius of 12 mm. Additionally, the neuromorphic system based on IZTO nanowires-based transistors achieves a high recognition accuracy exceeding 90 % for hand-written digits recognition. The synaptic transistor exhibits obvious self-adaptive behavior and a low energy consumption with reduction of 8.2 %. Self-adaptive neuromorphic flexible transistors can not only enhance their resemblance to biological systems, but also advance the development of wearable devices and neuromorphic calculation.
研究领域:
材料科学
·
纳米科技
·
生物电子学
·
神经形态工程
·
柔性电子器件
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 100
·97783-97790
·
IF 3.289
Ying Sun,Qizan Huang,Xueqin Zhang,Xiaojing Ding,Pei Han,Baoping Lin,Hong Yang,Lingxiang Guo
In recent years, side chain engineering has been proven to play a critical role in the development of high performance conjugated polymers for organic electronics. Here, we report a new strategy to improve charge transport property through side chain functionalization. A series of carbazole–diketopyrrolopyrrole based conjugated polymers P1, P2 and P3 with different side chains have been designed and synthesized. For P2 and P3, a pyrene and carbazole unit were incorporated into the terminal of the alkyl side chain, respectively. Thermal properties, crystallinities, UV-vis absorptions, electrochemical properties as well as charge transport properties of the polymers were investigated in detail. Interestingly, results showed that incorporation of the fused aromatic ring into the side chain terminal not only changed the absorption and electrochemical properties, but also affected the charge transport properties. The pyrene and carbazole group in the side chain terminal significantly promoted aggregation of the polymer chains, which would provide short-range order for improved charge carrier mobility. Compared to the hole mobility (0.019 cm2 V−1 s−1) for polymer P1 with the whole alkyl chains, increased hole mobilities of 0.081 cm2 V−1 s−1 and 0.052 cm2 V−1 s−1 were achieved for polymer P2 and polymer P3, respectively. It is worthy to note that our strategy gives rise to no increment of the crystallinity of the polymer, being beneficial for the practical application of soft electronics since high crystallinity of the material usually leads to poor thin film uniformity and weak mechanical resilience. In this respect, we offer a promising tool to aid rational polymer design for enhanced charge transport property.
研究领域:
高分子化学
·
有机电子学
·
材料科学
·
半导体材料
·
光电功能材料
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·Vol. 12
·期 5
·114091
·
IF 7.4
Xiaolong Dai,Tiangui Qi,Xiaobin Li,Zhihong Peng,Guihua Liu,Qiusheng Zhou,Yilin Wang,Leiting Shen
In recent years, lithium iron phosphate (LFP) batteries have been widely used in the electric vehicle industry. The recycling of spent LFP will be propitious to conserving resources and alleviating the environmental risks it poses. In this study, a selective extraction method for lithium from spent LFP was proposed using nitric acid . Lithium leached into the liquid phase, while P and Fe remained in the leaching residue. Under the conditions of 120°C, HNO 3 /Li molar ratio of 2, and time of 2 h, the leaching efficiency of lithium reached 99.5 %, with a selectivity reaching 82.1 %. Initially, LFP was decomposed to liberate Li, Fe, and P in the liquid phase. Subsequently, ferrous ions were oxidized to trivalent, high-valent iron ions re-precipitated as FePO 4 ·2 H 2 O. Thermodynamic calculations indicate that the temperature and pH value of the extraction system have significant influence on both the oxidation and reprecipitation steps. An imbalance of Fe/P ratio (<1) in the raw material hinders the selectivity of lithium extraction , and supplementing this portion of Fe can enhance the selectivity to over 90 %. Additionally, LiCO 3 and anhydrous FePO 4 were effectively regenerated from the leachate and residue. This study provides a novel approach for the recycling of spent LFP and probably contributes to the sustainability of the lithium ion battery industry.
研究领域:
环境科学
·
冶金工程
·
材料回收
·
可持续能源
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2023
·Vol. 34
·期 6
·1918-1932
·
IF 3.4
Yuqian Du,Xueya Wang,Ziwen Zhou,Feng Zhao,Song Li,Zhihua Liu,Zhengyu Wu,Shuai Zhao,Lin Li
Nowadays, although highly conductive polymer composites filled with two-dimensional graphene-based nano-fillers have been explored extensively, constructing nanocomposites with high performance, industrial feasibility, and more efficient conductive networks at lower nano-filler contents remains a challenge. To achieve the above objectives, industrial wastes microsilica powder (N98) with amorphous spherical structure and large particle size is employed in this work. And the hybrids (TGN) are obtained between N98 and graphene (GE) by the effective bridging and interface coupling of tannic acid, which can achieve the purpose of obtaining conductive composites with low-filler contents by traditional polymer processing technologies. The volume exclusion effect of N98 and its own assisted dispersion effect can prevent and attenuate graphene agglomeration, enabling the formation of a dense, complete and uniform conductive network in natural rubber (NR) matrix based on a small amount of graphene addition (parts per thousand). Thus, it give the nanocomposite highly functional, especially electric property. The results show that when the ratio of GE to N98 hybridization is 1:20, N98 and graphene are more uniformly hybridized together, and the volume exclusion effect is best matched with the rubber composites, and the comprehensive performance is optimal. Moreover, the electrical conductivity of NR/TG 1 N 20 nanocomposite can reach the balanced value of 10 −3 S·cm −1 with the GE loading of 0.48 phr, which shows the effectiveness of the prepared hybrids.
研究领域:
高分子科学
·
纳米复合材料
·
功能高分子
·
材料化学
·
导电聚合物
✓ 已验证
DOI
高影响因子
Progress in Natural Science-Materials International
·
2019
·Vol. 29
·期 3
·310-315
·
IF 3.31
Chao Hou,Ke Yang,Fawei Tang,Haibin Wang,Xuemei Liu,Xiaoyan Song
A micro-nano combined composite with Li-Si alloy nano-domains in three-dimensional carbon network was prepared as a novel electrode material. The carbon network constrained the volume contraction and promoted effectively charge transfer of the whole active material. Meanwhile, the abundant interfaces between Li-Si alloy and carbon bound by Li-C ionic bonds, not only enhanced the delithiation at interface but also ensured the structural integrity. The present composite exhibited excellent electrochemical performance. The specific capacity at the first lithiation was as high as 1133 mAh g −1 at a current density of 0.1 A g −1 , which is superior to those reported for the core-shell structured nanoparticles. The Coulombic Efficiency at the first cycle was 90.4% and kept stable at more than 99.0% after only 10 cycles. The capacity retention was nearly twice as that of the incompact mixture of Li-Si nanoparticles and carbon. The energy density of the full cell constructed by the present composite and sulfur was evaluated to be 3 times as high as that of the commercial lithium-ion batteries. This work provides a new universal strategy for developing Li-rich anode materials with high combination properties and low cost.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
固态物理
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2012
·Vol. 50
·期 24
·4995-4999
·
IF 3.919
Zhihai Hao,Hou Chen,Delong Liu,Lijun Fan
Sn(0)-mediated single electron transfer-living radical polymerization (SET-LRP) of acrylonitrile (AN) with carbon tetrachloride (CCl 4 ) as initiator and hexamethylenetetramine (HMTA) as ligand in N, N -dimethylformamide (DMF) was studied. The polymerization obeyed first order kinetic. The molecular weight of polyacrylonitrile (PAN) increased linearly with monomer conversion and PAN exhibited narrow molecular weight distributions. Increasing the content of Sn(0) resulted in an increase in the molecular weight and the molecular weight distribution. Effects of ligand and initiator were also investigated. The block copolymer PAN- b -polymethyl methacrylate with molecular weight at 126,130 and polydispersity at 1.36 was successfully obtained. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
研究领域:
高分子化学
·
聚合反应
·
功能高分子
·
材料化学
·
有机合成
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Tengchao Guo,Guoyue Xu,Shujuan Tan,Ning Liu,Jianchao Zhang,Xiangxiong Zeng,Juan Liang
The electronic properties and infrared emissivity of Zn 1-x Mg x O (x = 0, 0.0625, 0.125) were systematically investigated by using the first-principle calculation s based on density functional theory (DFT). The Zn 1-x Mg x O (x = 0, 0.0625, 0.125) powders were prepared by sol-gel method and their infrared emissivity in the wavelength of 8–14 μm was characterized. The results indicate that the infrared emissivity increases with the increase in Mg concentration, which is attributed to the reduction in conductivity and in the real part of dielectric function. Furthermore, the variation in conductivity and dielectric function has been well studied, and a reasonable method to calculate infrared emissivity of semiconductors has been established. It is expected that this method can be used for designing materials with different infrared emissivity and also applied for effectively guiding the experimental investigation.
研究领域:
材料科学
·
凝聚态物理
·
计算材料学
·
功能材料
·
半导体物理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）