JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xue-Xia Chen,Xu-Hua Xiao,Zhi-Feng Shi,Rui Du,Xin-Jian Li
Using silicon nanoporous pillar array (Si-NPA) as substrate, a kind of GaN/Si nanoheterostructure (GaN/Si-NPA) is prepared by depositing GaN nanocrystallites on Si-NPA with chemical vapor deposition method. The morphology characteristics and optical properties of GaN/Si-NPA are investigated systematically. Based on GaN/Si-NPA, a self-powered ultraviolet (UV) photodetector (PD) with device structure of ITO/GaN/Si-NPA/ sc -Si/Ag is constructed by depositing ITO on GaN layer and silver on single crystal silicon , respectively. At zero bias voltage without an external power supply, GaN/Si-NPA exhibits a responsivity of 0.072 mA/W, a high current on/off ratio of ∼10 4 (16 μW/cm 2 ) and fast response speeds of 39.98/40.10 ms under an UV light irradiation at 305 nm. The high performance of GaN/Si-NPA is attributed to the built-in electric field in the heterojunction , which is interpreted via building the energy-band diagrams. The results illustrate that GaN/Si-NPA might be a suitable material system for self-powered UV PDs.
研究领域:
材料科学
·
光子学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Ruoxi Zhang,Shengchen Ke,Wenxiang Lu,Weijian Zhu,Lu Ma,Linling Qin,Shaolong Wu,Xiaofeng Li
Constructing novel heterojunctions has become an effective strategy to improve the performance of photoelectrochemical (PEC) biosensors, but most of the glucose-sensing photoelectrodes involve enzyme modification and disordered or semi-closed surface topography which restricts the working environment and sensing performance. Herein, the dense and burr-like CuO nanospikes (CuONSs) are grown on all over the whole surfaces of the relatively-sparse and ordered Si nanowires (SiNWs) by a combination of magnetron sputtering and hydrothermal growth. The optimized SiNWs-CuONSs heterojunction with a core–shell structure achieves the enzyme-free PEC detection of glucose with a sensitivity of 2324.09 μA mM −1 cm −2 in the concentration range of 0–1.0 mM and a detection limit of 0.74 μM (Signal/Noise = 3). The excellent sensing performance is ascribed to that (1) the SiNWs with a large specific surface area acting as host have open-style surface topography, ensuring the analyte flowability; (2) the CuONSs with a desired glucose-catalytic activity are hierarchical, providing a great number of active sites; and (3) the SiNWs-CuONSs heterojunction has a satisfactory optical absorption and a high efficiency of the photogenerated-hole transfer. This work demonstrates that the enzyme-free and highly-sensitive glucose detection can be realized by morphology-controllable heterojunction, and provides an alternative route to noninvasive sensing.
研究领域:
纳米技术
·
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2023
·
IF 5.2
Yi Li,Ning Zhang,Jicai Liang,Kaifeng Yu,Zengxia Zhao,Ce Liang
Composites with good thermomechanical and UV-shielding properties are essential in fiber-reinforced composites. This paper focuses on composites' ultraviolet (UV) shielding efficiency with added Ce-Zr-Si oxide nanoparticles/epoxy resin. The Ce-Zr oxide nanoparticles were first functionalized with a silicon coupling agent and ethyl silicate to improve their dispersion and surface activity. In this work, we prepared epoxy nanocomposites with the addition of Ce-Zr -Si oxides(1,3,5,7 wt%) and found that the materials had good enhancement of the UV shielding properties of the epoxy resin matrix. Meanwhile, it was used in basalt fiber (BF)/epoxy composites prepared by the hot-pressing method, and surface treatment of basalt fibers was carried out. The results showed that the modified fiber composites could effectively enhance the thermomechanical properties of epoxy resin composites. It is noteworthy that the tensile strength and flexural strength of the hybrid composites reached their peak when 5 wt% Ce-Zr-Si was added, increasing by 13.8% and 33.67% respectively. The modified (BF)/epoxy composites exhibited improved thermal stability compared to pure epoxy resin, with the maximum weight loss temperature of BF-1/EP reaching 349°C. The T(UVA) decreased to 2.41%, while the T(UVB) decreased to 0.053%, and almost all the ultraviolet irradiation was blocked. These results show that our prepared composites have good thermomechanical and UV shielding properties. Highlights Ce-Zr oxide nanoparticles were functionalized with a silicon coupling agent. Ce-Zr-Si oxide was added to enhance the ultraviolet shielding efficiency. Modified BFs were composited to improve thermomechanical properties.
研究领域:
材料科学
·
复合材料
·
纳米技术
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Guijun Zhang,Hua Peng,Qianwen Wei,Zheng Zhou,Haixia Wu,Jingjing Luo,Juan Wang,Xiaoming Wen,Yu Yang
The photoelectric characteristics of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) films significantly affect the power conversion efficiency and stability of Si/PEDOT:PSS hybrid solar cells. In this paper, we investigated PEDOT:PSS modification with alcohol ether solvents (dipropylene glycol methyl ether (DPM) and propylene glycol phenyl ether (PPH)). The reduction of PSS content and the transformation of the PEDOT chain from benzene to a quinone structure in PEDOT:PSS induced by doping with DPM or PPH are the reasons for the improved conductivity of PEDOT:PSS films. DPM and PPH doping improves the quality of silicon with the PEDOT:PSS heterojunction and silicon surface passivation, thereby reducing the surface recombination of charge carriers, which improves the photovoltaic performance of Si/PEDOT:PSS solar cells. Comparing the power conversion performance (PCE) and air stability of Si/PEDOT:PSS solar cells with DPM (13.24%), DPH (13.51%), ethylene glycol (EG, 13.07%), and dimethyl sulfoxide (DMSO, 12.62%), it is suggested that doping with DPM and DPH can replace DMSO and EG to enhance the performance of Si/PEDOT:PSS solar cells. The EG and DMSO solvents not only have a certain toxicity to the human body but also are not environmentally friendly. In comparison to DMSO and EG, DPM and DPH are more economical and environmentally friendly, helping to reduce the manufacturing cost of Si/PEDOT:PSS solar cells and making them more conducive to their commercial applications.
研究领域:
材料科学
·
可再生能源
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Pan Tan,Jiaqin Wei,Sihong Luo,Guilin Wei,Xiaoan Li,Lijing Huang,Xirui Lu,Xiaoyan Shu
Glass matrices with high waste load capacity, stability, and economic viability holds significant technological implications for efficient and safe nuclear waste immobilization. Aluminosilicate glasses with various Si/Al molar ratios were successfully prepared by incorporating Al 2 O 3 into natural granite, effectively enabling precise regulation of the Si/Al ratios and overcoming the challenge of achieving complete vitrification. Here, we report a glass waste form with ultra-high CeO 2 loading (up to 20 wt .%) that exhibits excellent structural stability. At a Si/Al molar ratio of 3:1, cerium can incorporate into the glass network by forming Ce-O bonds through coordination with oxygen atoms in the [AlO 6 ] units. [AlO 6 ] is converted to more stable [AlO 4 ], thereby enhancing the stability of the glass. Up to 20 wt .% CeO 2 (9.62 mol%) can be fully incorporated into the glass system, where approximately 79.71 % of the bridging oxygen atoms form stable Si-O-Si and [AlO 4 ] units, contributing to a structurally robust glass network. The Ce-O bond length in the glass matrix is shorter (2.27 Å) than in CeO 2 , confirming enhanced coordination stability and aligning with superior chemical durability and mechanical properties. This work highlights the critical role of the Si/Al molar ratio and establishes low-cost granite could serve as a viable host material for nuclear waste immobilization.
研究领域:
材料科学
·
核工程
·
玻璃化学
·
废物处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 5
·1467-1476
·
IF 5.721
Zhuo-Qian Li,Xinxin Fu,Caiyan Gao,Jinyu Huang,Baojun Li,Yongpeng Yang,Jie Gao,Yonglong Shen,Zhikun Peng,Jing-He Yang,Zhongyi Liu
The one-step hydroalkylation of benzene to cyclohexylbenzene (CHB) needs to occur on bifunctional metal/zeolite catalysts, and introducing more acid sites to match the metal sites plays a key role in improving the matching of acid/metal sites toward the requirements of benzene hydroalkylation. Herein, we designed and constructed a Si–Al framework coating with extra acid sites outside the surface of the Pd/HBeta catalyst and obtained a zeolite-encaged Pd NP structure (Pd@HBeta). Notably, the Pd@HBeta catalysts achieved excellent catalytic performance with 44.0% CHB selectivity at about 85.0% benzene conversion, which is much higher than that of the Pd/HBeta catalyst with a CHB selectivity of 25.1% at the same benzene conversion. The remarkable increment of CHB selectivity of Pd@HBeta is mainly attributed to the extra acid sites provided by the coated Si–Al framework as well as the increase of the B/L ratio. Moreover, the adsorption capacity of benzene and cyclohexene is greatly improved after introducing extra acid sites by coating the Si–Al framework, which is beneficial for both hydrogenation and alkylation. Further DFT calculations reveal that C6H10 can easily desorb from Pd NPs and migrate to the acidic channel of HBeta in the Pd@HBeta catalyst than that in Pd/HBeta. Our work presents an elegant example of catalytic hydroalkylation selectivity regulation by coating an extra Si–Al framework to enhance the matching of acid/metal balance.
研究领域:
催化
·
化学工程
·
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 36
·16781-16787
·
IF 6.97
Na Li,Zheng Yi,Ning Lin,Yitai Qian
The application of Si-based anode materials is hindered by their extreme volume change, poor cycling stability, and low coulombic efficiency. Solving these problems generally requires a combination of strategies, such as nanostructure designing or surface coating. However, these strategies increase the difficulty of the fabrication process. Herein, a simple and one-pot replacement reaction route was designed to produce an Al2O3 layer anchored on mesoporous Si nanospheres (Si@Al2O3) by employing Al nanospheres with a naturally formed Al2O3 layer as a reducing agent and self-sacrificial template. The obtained Si@Al2O3 was mesoporous, with enough porous space to buffer the volume change and provide a fast lithium ion transfer channel. Furthermore, the coated Al2O3 layer could stabilize the structure and SEI layer of the mesoporous Si nanospheres, endowing the Si@Al2O3 nanospheres with improved initial coulombic efficiency, cycling performance and rate capability. As a result, a high capacity of 1750.2 mA h g−1 at 0.5 A g−1 after 120 cycles and 1001.7 mA h g−1 at 2 A g−1 after 500 cycles were delivered for lithium ion batteries. The good performance could be attributed to the mesoporous structure and the outer-coated Al2O3 layer.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kangyu Liu,Bingzhang Shao,Haichao Liu,Jinlong He,Aiguo Zheng,Genghong Li,Bo Zheng,Zeyang Li,Wei Liu,Xuefeng Li,Baoning Zong
Antibacterial monomers are prerequisites for synthesizing antibacterial polymers, especially during the current COVID-19 pandemic. Dimethyl-protected cyclic lysine (DMCL) is a promising functional monomer for nylon-6 based self-cleaning antibacterial polymers. However, the production of DMCL still faces formidable challenges, such as harsh reaction conditions and low catalyst activities. In this study, we developed a Pd/ m -Al 2 O 3 -Si catalyst, which exhibited high efficiency in converting α -amino- ε -caprolactam ( α -ACL) to DMCL, affording a yield of as high as 97.1% at 100 °C and 1 MPa H 2 . The lack of Brönsted acid sites on the catalyst surface facilitated the formation of DMCL and suppressed undesirable hydrolysis or cracking by-products from the lactam-based reactant. The recycled experiments showed that Pd/ m -Al 2 O 3 -Si performed excellent stability and physical strength with essentially no damage to its microspheres after the reaction. The nylon‑6 copolymers produced from the as-synthesized DMCL exhibited similar structure and thermal stability with pure nylon-6, showing great potential in synthesizing the self-cleaning antibacterial polymers. This work provides a sustainable and efficient method for producing DMCL and other lysine-based antibacterial monomers, showing a great prospect for the utilization of bio-based chemicals in synthesizing functional polymers.
研究领域:
有机化学
·
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Xilei Xie,Peng Xiao,Liang Pang,Peng Zhou,Yangjie Li,Jian Luo,Jiangzhi Xiong,Yang Li
The low cost and high performance via a simple way of fabrication are considerable challenges for Si-based anode in the application of lithium-ion batteries. In this study, we synthesize a novel free-standing Si/C anode, consisting of yolk (Si)-shell (amorphous carbon) nanoparticles and carbon nanofibers (denoted as Si@void@C/CNFs), via a facile route of template removal and electrospun. The designed yolk-shell structure help buffer the volume expansion of silicon during the discharge/charge cycles, and the intertwined CNFs are conducive to electron fast transmission and guarantee structural integrity. As expected, with a low Si content (∼23 wt%), the self-supporting electrode of Si@void@C/CNFs exhibits a high specific capacity of ∼627.5 mAh g −1 as well as 69.3% capacity retention at 0.1 A g −1 after 100 cycles, better than Si@C/CNFs (20%) and Si/CNFs (9.5%) electrodes. The superior performance of Si@void@C/CNFs indicates that it is an attractive anode material for the practical application of Lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Renlong Li,Chuankai Fu,Binghan Cui,Can Cui,Xue Mu,Yunzhi Gao,Geping Yin,Pengjian Zuo
Si-based anode materials have become the most popular candidate in next generation high-specific energy lithium-ions batteries owing to the advantages of high theoretical capacity, low operation potential, environmental friendliness , and low cost. However, the huge volume changes of Si-based anode during the charging and discharging process results in unstable solid electrolyte interphase (SEI) films and poor cycling performance. Here, 2-isocyanatoethyl methacrylate (IEM) and fluoroethylene carbonate (FEC) are used as functional electrolyte additives to constructing stable and durable inorganic-organic composite SEI films on the surface of Si@Graphene (Si/G) anode. The composite SEI film can tolerate the volume change of Si/G anode. As a result, the Si/G anode shows enhanced initial Coulombic efficiency (ICE), cycling stability and rate capability. Specifically, the ICE of Li||Si/G cell can reach 90%, and the specific capacity of Li||Si/G cell can maintain 1373 mAh g −1 after 100 cycles at the rate of 1 A g −1 by adding 1 vol% IEM and 9 vol% FEC.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 12
·8204-8213
·
IF 3.9
Fangli Li,Ziqin Huang,Changjiang Liu,Meini Yang,Jixiang Wu,Wenhui Rao,Chuanbai Yu
Currently, additively efficient flame retardants are being developed to enhance the smoke suppression, flame retardancy, and thermal properties of composite materials. To this end, the current study designed and prepared a novel P/N/Si/Zn-containing organic–inorganic hybrid denoted as APHZ. Its inorganic part was 2-methylimidazole zinc salt (ZIF-8), which improved its smoke suppression and catalytic carbonization. The organic part (P/N/Si-containing compound) promoted its flame retardancy and interfacial compatibility between APHZ and epoxy resin (EP). The test results revealed that EP/APHZ-3 composites achieved a V-0 rating and a notable LOI value of 30.7% when introducing 3 wt% APHZ into the EP matrix. Cone calorimetry tests (CCT) further demonstrated that the average heat release rate (av-HRR), total smoke production (TSP), and CO production (COP) of EP/APHZ-3 were reduced by 23.3%, 14.0%, and 21.1%, respectively. Meanwhile, the char residual was increased by 60.6%, as compared to pure EP. Furthermore, the flame-retardant mechanism of EP/APHZ composites was investigated by the XPS, TG-FTIR, and Raman spectroscopy techniques. The observed synergistic effect of the imidazole skeleton ZIF-8 and P/N/Si-containing compound in APHZ facilitated the generation of a dense multi-element char layer, with the condensed phase flame-retardant mechanism playing a dominant role. These findings contribute to developing and designing high-performance flame-retardant EP.
研究领域:
材料科学
·
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 82
·67031-67040
·
IF 3.84
Z. Y. Wu,X. A. Fan,G. Q. Li,J. Wang,Z. H. Gan
Core–shell structured Fe-6.5 wt% Si/SiO2 particles and intergranular insulated Fe-6.5 wt% Si/SiO2 composite compacts with tunable insulating layer thickness were prepared by in situ chemical deposition combined with a subsequent spark plasma sintering process. Most of conductive Fe-6.5 wt% Si alloy particles were coated with a SiO2 insulating layer in the Fe-6.5 wt% Si/SiO2 composite compacts. The SiO2 insulating layer could increase the electrical resistivity and reduce the effective radius of the eddy current in Fe-6.5 wt% Si/SiO2 composite compacts. Therefore, the intergranular insulated Fe-6.5 wt% Si/SiO2 composite compacts presented lower core loss than those of Fe-6.5 wt% Si compacts without SiO2 insulating layer. Based on this, several types of Fe-6.5 wt% Si/SiO2 core–shell particles and intergranular insulated Fe-6.5 wt% Si/SiO2 composite compacts (with various SiO2 insulating layer thicknesses) were selectively prepared by simply varying the TEOS concentration (the volume of TEOS for each gram of Fe-6.5 wt% Si particles, ml g−1). The results indicated that the thickness of the SiO2 layer and electrical resistivity of Fe-6.5 wt% Si/SiO2 composite compacts increased with increasing the TEOS concentration from 0.1 to 0.4 ml g−1, while saturation magnetization, relative permeability and core loss displayed the reverse tendencies. The as-prepared intergranular insulated Fe-6.5 wt% Si/SiO2 composite compacts exhibited excellent magnetic properties, which inspire us to develop new high silicon containing soft magnetic cores which can be widely used in various electromagnetic devices.
研究领域:
材料科学
·
电磁学
·
冶金学
✓ 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）