RSC Advances
·
2019
·Vol. 9
·期 1
·498-506
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IF 3.049
Wei Wang,Ang Zheng,Yifan Jiang,Dongsheng Lan,Fenghua Lu,Lelin Zheng,Lin Zhuang,Ruijiang Hong
Monodisperse colloidal particles have promising applications in electrophoretic displays with vivid colors, reversibility and low switching times. In this study, a facile, effective and large-scale strategy for preparing size-controlled Fe3O4@SiO2 particles is reported. Multiple Fe3O4 particles were synthesized by a modified solvothermal method using sodium citrate as a surface modifier with a binary solvent, and were then coated with a SiO2 layer to obtain a highly negatively charged surface via a modified Stöber method. Owing to the easily controlled sizes and sufficient surface charges, Fe3O4@SiO2 particles can be assembled into colloidal amorphous arrays with the balance of electrostatic repulsion and electrophoretic forces. The reflections cover wavelengths ranging from 802 to 453 nm, and were optimized by investigating the dependence of the particles on variables such as particle size, particle volume fraction, and electric field intensity. The large-scale preparation of electrically responsive Fe3O4@SiO2 particles facilitates an electrophoretic display with broad-range colors, showing the practical potential in industrial application.
研究领域:
材料科学
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纳米技术
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显示技术
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产品关联
DOI
PubMed
高影响因子
JOM
·
2019
·Vol. 72
·期 6
·2245-2249
·
IF 2.305
Zhang Yannan,Zhang Yingjie,Li Xue,Liu Jiaming,Zhang Mingyu,Yang Xi,Huang Mengyang,Xu Mingli,Dong Peng,Zhou Zhongren
The molten salt electrolytic method was introduced to prepare metallic silicon that simply utilizes SiO 2 powder as the raw material and equimolar CaCl 2 -NaCl as the electrolyte under 1.8 V current at 700°C for 5 h.
The electrochemically synthesized silicon was in the form of nanowire structures with average sizes of 90 nm in diameter and over 1 μm in length. The current efficiency and specific energy consumption of producing silicon nanowires were calculated to be 79.2% and 8.703 kWh/kg, respectively. Benefiting from the synthesized nanowire structure, the silicon anode exhibited a high initial discharge-specific capacity of 3348.1 mAh/g with an initial coulombic efficiency of 85.2%.
The present research provides a straightforward idea to show the feasibility of synthesizing silicon-based material by the molten salt electrolytic method and to introduce the application of synthesized silicon nanowires to lithium-ion battery systems.
研究领域:
材料科学
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电化学
·
纳米科技
·
能源存储
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无机合成
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 68
·38850-38859
·
IF 2.936
Yaozu Guo,Dong Zhao,Junhua You,Wenli Pei,Yingdong Qu,Xiaoyang Wang,Qingyu Meng
Nd2Fe14B nanoparticles were successfully prepared by using a low-energy chemical method. The microscopic characteristics and formation mechanisms of the phases were investigated at each stage during the preparation of Nd-Fe-B nanoparticles. The Nd-Fe-B intermediates, Nd-Fe-B oxides and reduced Nd-Fe-B nanoparticles were detected and analyzed by using TEM, STEM, XRD, SEM, VSM and Rietveld calculations. The results showed that the intermediate of Nd-Fe-B consisted of Fe3O4 and Nd and Fe elements surrounded by nitrile organic compounds. The Nd-Fe-B oxide was composed of NdFeO3 (48.619 wt%), NdBO3 (31.480 wt%) and α-Fe (19.901 wt%), which was formed by the reaction among Nd, Fe3O4 and B2O3. NdFeO3 and NdBO3 exhibited a perovskite-like lamellar structure, and the grain size was smaller than that of α-Fe. Nd-Fe-B particles were mainly composed of Nd2Fe14B and α-Fe phases. The small particles of NdFeO3 and NdBO3 and the interstitial position between oxide particles and α-Fe were more favorable for the formation of Nd2Fe14B particles. At the same time, the surface of α-Fe particles can also diffuse to form Nd2Fe14B nanoparticles. The coercivity of Nd-Fe-B particles was 5.79 kOe and the saturation magnetization was 63.135 emu g−1.
研究领域:
材料科学
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纳米材料
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磁性材料
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无机非金属材料
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固体化学
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DOI
高影响因子
Advanced Optical Materials
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2019
·Vol. 7
·期 20
·1900774
·
IF 7.125
Xin Zhang,Dengbao Han,Chenhui Wang,Imran Muhammad,Feng Zhang,Ali Shmshad,Xulan Xue,Wenyu Ji,Shuai Chang,Haizheng Zhong
The in situ fabricated perovskite nanocrystals (PNCs) obtained through spin-coating a precursor solution are suitable candidates to achieve efficient perovskite light emitting diodes (PeLEDs). In this work, the solvent effects of on-chip crystallization are investigated by correlating the nucleation and growth process of in situ fabricated formamidinium lead iodide (FAPbI 3 ) nanocrystals with their optical and electronic properties. The FAPbI 3 nanocrystals obtained from a precursor solution in γ-butyrolactone (GBL) are smaller than those obtained from N , N -dimethylformamide and dimethyl sulfoxide, and the relatively weak coordination between GBL and the precursor molecules enables reduced defect states in the resulted PNCs with enhanced photoluminescence properties. A modified LaMer model is proposed to describe the solvent effects in the on-chip crystallization process. Based on these understandings, red emissive FA 0.87 Cs 0.13 PbI 3 nanocrystal films with absolute photoluminescence quantum yields up to 70% are realized. Finally, an efficient PeLED with maximum luminance of 218 cd m −2 and peak external quantum efficiency of 15.8% is achieved with good reproducibility.
研究领域:
材料科学
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纳米科技
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光电子学
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半导体器件
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凝聚态物理
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2017
·
IF 6.395
Zhiliang Chen,Guang Yang,Xiaolu Zheng,Hongwei Lei,Cong Chen,Junjie Ma,Hao Wang,Guojia Fang
Perovskite solar cells have developed rapidly in recent years as the third generation solar cells. In spite of the great improvement achieved, there still exist some issues such as undesired hysteresis and indispensable high temperature process. In this work, bulk heterojunction perovskite-phenyl-C 61 -butyric acid methyl ester solar cells have been prepared to diminish hysteresis using a facile two step spin-coating method. Furthermore, high quality tin oxide films are fabricated using pulse laser deposition technique at room temperature without any annealing procedure. The as fabricated tin oxide film is successfully applied in bulk heterojunction perovskite solar cells as a hole blocking layer. Bulk heterojunction devices based on room temperature tin oxide exhibit almost hysteresis-free characteristics with power conversion efficiency of 17.29% and 14.0% on rigid and flexible substrates , respectively.
研究领域:
材料科学
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光伏技术
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纳米材料
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能源材料
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半导体器件
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薄膜制备
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 16
·6772-6779
·
IF 9.931
Fan Chen,Ruiheng Liu,Zheng Yao,Yunfei Xing,Shengqiang Bai,Lidong Chen
Skutterudite-based thermoelectric materials have great potential for use in waste heat recovery, but the conventional melting–quench–annealing process is not suitable for large-scale fabrication. In this study, we developed a rapid fabrication technique that combines scanning laser melting and spark plasma sintering to synthesize bulk n-type and p-type filled skutterudites. The kinetics process and microstructure evolution during the scanning laser melting and annealing were systematically investigated. Due to fast solidification in scanning laser melting, the peritectic segregation size of precursor resultants is confined to several microns, which leads to great shortening of the fabrication period of filled skutterudites. The as-synthesized n-type and p-type filled skutterudites achieve excellent dimensionless figures of merit: ZT ∼ 1.23 at 850 K for Yb0.4Co4Sb12.1; ZT ∼ 1.09 at 700 K for In0.5Co4Sb12.1; ZT ∼ 0.79 at 750 K for Ce0.95Fe3CoSb12.1, which are among the highest values of single filled skutterudites. The shortened processing period and enhanced thermoelectric performance make this novel synthesis method suitable for industrial-level large-scale fabrication of skutterudite-based thermoelectric materials.
研究领域:
材料科学
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热电材料
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金属学与冶金工程
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固态物理
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先进制造技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 40
·16028-16034
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IF 5.101
Jun Shi,Zhengzheng Zhang,Gefei Li,Shaokui Cao
Alginate/CaCO3 hybrid beads with pH- and thermal-responsive drug release properties were prepared under compressed CO2 using aliphatic poly(urethane-amine)s (PU) as the thermal-responsive component. Polyacrylic acid (PAA) was used as a crystal growth additive to control the structure of the hybrid beads. The hybrid beads were characterized by using scanning electron microscopy, X-ray powder diffraction and thermogravimetric analysis. The interaction between PAA and aliphatic PU contributed to the formation of alginate beads with a compact CaCO3 shell. Indomethacin release behaviour was found to be pH- and thermal-responsive. The release profiles were sustained with CaCO3 microparticles, indicating that the compact CaCO3 shell could hinder the permeability of the encapsulated drug and reduce the drug release effectively. The results suggest that the hybrid alginate beads can be used as “smart” polysaccharide materials for sustained dual-responsive drug delivery.
研究领域:
生物材料
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药物递送系统
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高分子科学
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纳米医学
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药剂学
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生物化学
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组织工程
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Feihong Zhang,Qiaohang Weng,Yanxiang Zhang,Na Ai,San Ping Jiang,Chengzhi Guan,Yanqun Shao,Huihuang Fang,Yu Luo,Kongfa Chen
Solid oxide fuel cells (SOFCs) are the most efficient energy conversion technology to convert the chemical energy of fuels like hydrogen, natural gas, etc. to electricity. However, one of the limiting factors in the commercial viability of SOFCs technologies is the time-consuming and high-cost multiple cell fabrication processes. Here, we report the development of a facile procedure for the preparation of an electrolyte-supported cell with a Ni-Gd 0.1 Ce 0.9 O 1.95 composite anode and a La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ cathode, and the fabrication procedure of the electrodes decreases from four steps of screen-printing and sintering of conventional cell preparation processes to two steps of screen-printing using a direct assembly approach without the high-temperature sintering steps. The most important observation is the simultaneous formation of the electrode/electrolyte interfaces of both the anode and cathode by in situ passing a current through the directly assembled cells at 800 ℃. The power density of the directly assembled cell reaches 0.41 W cm −2 at a voltage of 0.7 V and 800 ℃, close to 0.46 W cm −2 of the sintered cell. The directly assembled cell shows comparable operational stability to the sintered cell at 800 ℃ for 100 h. This work sheds light on the facile fabrication of electrolyte-supported cells with substantially simplified preparation procedures and reduced costs.
研究领域:
材料科学
·
能源化学
·
电化学
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燃料电池技术
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无机功能材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Chenxi Zhang,Xueshuang Deng,Jianfeng Zheng,Xin Zhou,Jianhua Shi,Xiaohong Chen,Zhuo Sun,Sumei Huang
We report a simple and low-cost approach to enhance the longstanding stability of the perovskite solar cell (PSC) through the application of low-temperature grown SnO 2 nanorod (NR) arrays. SnO 2 NR arrays were fabricated by an aqueous synthesis method in the presence of hydrochloric acid and using thin compact SnO 2 as seeds. The influence of HCl concentration on the photovoltaic (PV) performance of the SnO 2 NR array based PSC device was investigated. The formed crystalline SnO 2 nanorods with square transversal-sections were oriented on the FTO facets in a well-defined and perpendicular fashion at an optimal HCl concentration. The optimized width and length for SnO 2 nanorods were 30 nm and 150 nm, respectively. Consequently, efficient and stable SnO 2 nanorod based perovskite devices were obtained with an average power conversion efficiency (PCE) of 16.57%. The SnO 2 nanorod array based PSCs demonstrated considerably better ultraviolet (UV) and ambient air stability than the planar SnO 2 and notably mesoporous TiO 2 solar cells. This paper provides a prospective scheme to grow high-quality three-dimensional SnO 2 nanorod arrays for highly stable and efficient PSCs.
研究领域:
材料科学
·
纳米科技
·
能源化学
·
光伏技术
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半导体器件
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2023
·Vol. 8
·期 2
·358-368
·
IF 5.6
Hai Lu,Peichun Wang,Yitian Ma,Meng Liu,Linqing Chang,Rui Feng,Shuliang Luo,Zhiyun Zhang,Yi Wang,Yan Yuan
In this study, quasi-solid polymer electrolytes incorporating an ionic liquid (ILQSEs) fabricated in different organic solvents via a thermally-initiated polymerization strategy were investigated for flexible supercapacitors (SCs). It was found that low-viscous acetonitrile (AN) with a strongly-polar nitrile group was remained in the polymer matrix, which favored a higher ionic conductivity, wider electrochemical window, and better thermal stability of the ILQSE compared to its propylene carbonate (PC) counterpart. Moreover, the in situ polymerized quasi-solid electrolyte achieved close contact with the porous carbon electrode, accompanied by the favorable permeation of the IL into the electrode for enhancing the ion-transport kinetics and interface stability. Consequently, the as-assembled SC with the AN-based ILQSE delivered a high specific energy and specific power, excellent cycle stability, and reliable safety.
研究领域:
材料科学
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电化学
·
高分子化学
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能源存储
·
纳米科技
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Zongbao Zhang,Yang Zhou,Yangyang Cai,Hui Liu,Qiqi Qin,Xubing Lu,Xingsen Gao,Lingling Shui,Sujuan Wu,Jun-Ming Liu
Planar perovskite solar cells (PSCs) based on CH 3 NH 3 PbI 3- x (SCN) x (SCN: thiocyanate) active layer and low-temperature processed TiO 2 films are fabricated by a sequential two-step method in ambient air. Here, alkali thiocyanates (NaSCN, KSCN) are added into Pb(SCN) 2 precursor to improve the microstructure of CH 3 NH 3 PbI 3- x (SCN) x perovskite layers and performance of the as-prepared PSCs. At the optimum concentrations of alkali thiocyanates as additives, the as-prepared NaSCN-modified and KSCN-modified PSCs demonstrate the efficiencies of 16.59% and 15.63% respectively, being much higher than 12.73% of the reference PSCs without additives. This improvement is primarily ascribed to the enhanced electron transport , reduced recombination rates and much improved microstructures with large grain size and low defect density at grain boundaries. Importantly, it is revealed that the modified PSCs at the optimized concentrations of alkali thiocyanates additives exhibit remarkably improved stability than the reference PSCs against humid circumstance, and a continuous exposure to humid air without encapsulation over 45 days only records about 5% degradation of the efficiency. These findings provide a facile approach to fabricate efficient and stable PSCs by low processing temperature in ambient air, both of which are highly preferred for future practical applications of PSCs.
研究领域:
材料科学
·
能源科学
·
纳米技术
·
光电化学
·
半导体器件
·
薄膜物理
✓ 已验证
DOI
高影响因子
SN Applied Sciences
·
2020
·Vol. 2
·期 7
·1246
·
IF 0
Li Bowen,Zhang Yipeng,Wang Jiashuai,Jia Zezhao,Shi Chengqian,Ma Yanqing,Ma Lei
The double-electrolyte etching method is a simple and effective way to fabricate ultra-sharp scanning tunnel microscopy (STM) tungsten tips. However, it is still challenging for this method to get ultra-sharp tungsten tips with high yield. In this work, significant enhancing of the yield is presented through optimized etching parameters as follows: temperature of 26 °C, applied voltage 7.5 V, electrolyte concentration 4 mol L −1 and length below the liquid lamellae of 2 mm. Under these conditions, the smallest tip radius is around 8 nm and the yield (radius < 10 nm) is 63.5%. These tips are capable of producing high-quality atomic resolution STM images, as demonstrated by testing on Si (111) and highly oriented pyrolytic graphite (HOPG) samples at room temperature. Furthermore, in order to find the relationship between the tip features and experimental etching parameters, an artificial neural network (ANN) model is built by machine learning. Garson’s algorithm is used to analyze the relative importance of each experimental parameter on tip features. The tip features can be estimated by this model with a correlation factor R over 0.85 indicating great predictive performance . Importance analysis indicates that the length of the tungsten wire below the liquid lamellae is the most important parameter to obtain high-quality STM tungsten tips in the double-electrolyte etching method. This result provides a clear direction for rapidly selecting optimized tip fabrication parameters in the future.
研究领域:
纳米科技
·
表面科学
·
材料表征
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计算材料学
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仪器与方法
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电化学加工
✓ 已验证
DOI
危险品化学品经营许可证（带存储）