MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2015
·
IF 1.955
Chang Su,Yu Li,Yue He,Li Liu,Xuesong Wang,Lili Liu
In this work, pure and Al 2 O 3 -doped α-Fe 2 O 3 nanotubes were synthesized by a simple single-capillary electrospinning technology and followed calcination treatment. The morphologies and crystal structures of the as-prepared samples were characterized by scanning electron microscopy and X-ray diffraction, respectively. The research of the samples gas sensing properties demonstrates that the ethanol sensing properties of α-Fe 2 O 3 nanotubes are enhanced by doping Al 2 O 3 , remarkably. The response value of Al 2 O 3 -doped α-Fe2O3 nanotubes to 50 ppm ethanol is 41.8 at the operating temperature 240 °C, which is much higher than that of pure α-Fe2O3 nanotubes (response value is 4). And the lowest detection limit is 300 ppb, to which the response value is about 2. The response and recovery times are about 20 and 60 s–50 ppm ethanol, respectively. In addition, the Al 2 O 3 -doped α-Fe2O3 nanotubes possess good selectivity and long-term stability.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Jing Yang,Jin Wang,Biao Shi,Yixin Dong,Dongxue Liu,Shenhzhi Xu,Qian Huang,Xiaona Du,Fu Zhang,Miao Yang,Yongcai He,Bo He,Xiaoning Ru,Shengzhong Liu,Xixiang Xu,Pengyang Wang,Ying Zhao,Xiaodan Zhang
[4-(3,6-dimethyl-9H-carbazol-9-yl)butyl]phosphonic acid (Me-4PACz) self-assembled monolayer (SAM) as the hole transport materials have been demonstrated remarkable potential in perovskite solar cells (PSCs). However, the hydrophobicity of Me-4PACz presents a critical challenge for the fabrication of high-quality perovskite films due to its poor wettability. Here, a doped Al 2 O 3 with Me-4PACz to modify the Me-4PACz surface was proposed. On one hand, this approach improved the wettability of the Me-4PACz film, enhancing the coverage, uniformity, and buried interface properties of the perovskite film. On the other hand, compared to Al 2 O 3 modification alone, doping Al 2 O 3 with Me-4PACz allowed direct contact between the perovskite and Me-4PACz, resulting in better buried interface passivation. As a result, we achieved an efficiency of 22.71% for single-junction wide-bandgap perovskite solar cells (1.68 eV). Additionally, the efficiency of perovskite/silicon tandem solar cells was improved from 28.68% to 30.92%, with a significant reduction in hysteresis. Furthermore, the tandem cells demonstrated no degradation after 4200 s of operation at the maximum power point.
研究领域:
材料科学
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光伏技术
·
界面工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhijian Wang,Lanlan Liu,Qifeng Du,RuiTao Tang,Jun Ai,Ying Chen
Ti-related oxide ceramics often exhibit excellent microwave dielectric properties and are widely applied in the microwave communication field. However, their microwave dielectric properties are often influenced by unstable defects, which are caused by the relatively low oxygen partial pressure at high sintering temperatures . In this work, Al 2 O 3 was introduced to improve the defect structures of the 0.85CeO 2 -0.15TiO 2 ceramics. According to the XPS pattern and AC conductivity analysis, Al 2 O 3 doping could stabilize the valence state of Ti but increase the oxygen vacancy concentration. Q × f first increased and then decreased as the Al 2 O 3 content increased. The highest Q × f value of 54361 GHz was obtained for the CTA0.015 sample sintered at 1275 °C, as well as the ε r of 29.41 and τ f of +7.8 ppm/°C. Finally, the CTA0.015 sample was used to prepare a microstrip antenna via the screen-printing process, which exhibited a good temperature-independent resonant frequency and indicated good application prospects.
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
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 11
·14746-14754
·
IF 5.6
Boyu Chen,Lijuan Niu,Jianlong Chai,Zhiyuan Bai,Jiayin Zhang,Di Liu,Xuefeng Lu,Yabin Zhu
β-SiC ceramics were prepared by spark plasma sintering at 2200 °C with Y 2 O 3 , MgO , and CeO 2 as sintering additives. Al 2 O 3 was doped based on the above oxides to form a two-component sintering additive to carry out a comparative analysis. The effects of these additives on the microstructure, bulk density, and Vickers hardness of β-SiC were systematically studied. The mechanical properties of the single-component samples were superior to those of the two-component samples. Notably, the single-component sample with Y 2 O 3 , addition exhibited the highest density (98.69 %) and hardness (27.1 GPa), which can be attributed to the appropriate growth of the grains in the single-component sample with Y 2 O 3 . Additionally, the principle of lattice reduction in SiC ceramics was explored using first-principle calculations, further highlighting the advantage of Y 2 O 3 as a single additive for the high-temperature sintering of SiC ceramics.
研究领域:
材料科学
·
陶瓷学
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力学性能
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计算材料学
✓ 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）