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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 11
·8329-8338
·
IF 2.019
Xing Honglong,Shen Ziyao,Wang Lei,Zhu Yanting,Ji Xiaoli
α-Fe 2 O 3 /SnO 2 @polyaniline composites were prepared by combining a hydrothermal reaction and an emulsion polymerization process. The sizes of α-Fe 2 O 3 and SnO 2 particles dispersed into PANI were 80–120 and 8 nm, respectively. The structure, morphology, and electromagnetic (EM) parameters were characterized by using X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and vector network analysis. To achieve the absorption of different EM bands, the EM wave absorption properties of α-Fe 2 O 3 /SnO 2 @PANI composites with different stannic oxide content were investigated according to transmission line theory. Polarizations and multiple reflections in the composite absorber play a key role in EM wave absorption. The α-Fe 2 O 3 /SnO 2 @PANI composites exhibited high EM absorption capacity and an optimal reflection loss of −50.3 dB at 9.9 GHz with thickness of 2.7 mm. Moreover, the composite could reach an effective absorption bandwidth (below −10 dB) from 7.84 to 12.08 GHz. Thus, the synthesized composites are suitable candidates for highly efficient EM wave absorption in the entire X-band.
研究领域:
材料科学
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电磁学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2018
·
IF 0
Chenlu Ye,Kang Hu,Zhijuan Niu,Yiran Lu,Lin Zhang,Kai Yan
One-step controllable synthesis of rhombohedral α-Fe 2 O 3 photocatalyst has been successfully developed by P123 soft template assisted method. A combination analysis of XRD, BET, SEM and HRTEM has documented that P123 surfactant plays a crucial role in the controllable synthesis of rhombohedral α-Fe 2 O 3 with the exposure of (110) and (012). The as-obtained α-Fe 2 O 3 material is efficient for the photocatalytic degradation of Bisphenol A (BPA). About 91% of BPA (30 mg/L) was degraded by using 1 g/L α-Fe 2 O 3 within 6 h under the simulated sunlight irradiation, which was almost twice higher than that of commercial Fe 2 O 3 . More importantly, reaction intermediates (e.g., 4, 4′-methylenediphenol, phenol and lactic acid) were confirmed by LC–MS/MS analysis, and the rational pathway of BPA degradation was finally proposed.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Jiajia Cai,Lingna Kong,Xiangxuan Tang,Jianmin Wang,Zhihong Xie,Xianxuan Wang,Qian Xie,Qiyan Xu
Hematite (α-Fe 2 O 3 ) is one of the most promising candidates as a photoanode for photocathodic protection (PCP) of 304SS. However, serious charge recombination has hindered the application. In this work, we verified the feasibility of constructing heterojunction for enhancing the PCP performance. α-Fe 2 O 3 @Bi 2 S 3 can not only broaden the solar light absorption region but also provide a built-in electric field to improve charge separation and close junctions for charge transport. When α-Fe 2 O 3 @Bi 2 S 3 was coupled with 304SS, the OCP under illumination negatively shifted to −0.788 V Ag/AgCl , which was ca . 600 mV negative than the corrosion potential of 304SS. The photoinduced current density reached 32 μA cm −2 , outperforming the bare Bi 2 S 3 and α-Fe 2 O 3 . The formation of a type II heterojunction between Bi 2 S 3 and α-Fe 2 O 3 was proposed and verified by the electrochemical impedance measurements.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 2
·227
·
IF 2.9
Renjie Wang,Shanshan Liu,Xudong Song,Kai Jiang,Yaohui Hou,Qiaohuan Cheng,Wei Miao,Li Tian,Ying Ren,Sankui Xu
Uric acid, a metabolite formed by the oxidation of purines in the human body, plays a crucial role in disease development when its metabolism is altered. Various techniques have been employed for uric acid analysis, with electrochemical sensing emerging as a sensitive, selective, affordable, rapid, and simple approach. In this study, we developed a polymer-based sensor (PPy/α-Fe2O3) for the accurate determination of uric acid levels. The PPy/α-Fe2O3hybrids were synthesized using an uncomplicated in situ growth technique. Characterization of the samples was performed using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The electrochemical sensing performance towards uric acid was evaluated through cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The obtained results demonstrated that the sensor exhibited excellent sensitivity towards uric acid detection within a wide range of 5–200 μM with a limit of detection (LOD) as low as 1.349 μM. Furthermore, this work elucidated the underlying sensing mechanism and highlighted the pivotal role played by PPy/α-Fe2O3hybrids in enabling efficient uric acid sensing applications using electrochemical sensors.Keywords:polypyrole;α-Fe2O3;uric acid;electrochemical sensor;differential pulse voltammetry
研究领域:
电化学
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材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Tong Liu,Yu Liu,Yuwei Ye,Jingyu Li,Feng Yang,Haichao Zhao,Liping Wang
In this study, a self-healing epoxy coating containing tetraaniline modified α-Fe 2 O 3 (TAFe) was prepared for corrosion protection of Q235 steel. The TAFe particles were synthesized using bio-inspired catechol chemistry and the evaluation of the corrosion resistant benefits of TAFe as additive in the epoxy coating were conducted. The time-dependent corrosion protective ability of the epoxy composite coating containing TAFe applied on Q235 carbon steel were characterized by electrochemical techniques such as EIS and LEIM. Characterization of corrosion layer was done by SEM and XRD after removing coatings after 70 days of immersion in 3.5 wt% NaCl solution. Findings of corrosion measurements confirmed the existence of a small amount TAFe (0.7 wt%) resulted in improvement of corrosion protective properties of steel during corrosion process compared with neat epoxy coating and the coating with 0.7 wt% non-modified Fe 2 O 3 . Moreover, surface techniques showed compact passivated iron oxide layer beneath the coatings and presence of different metallic oxide phases for coatings. The corrosion protective enhancement of composite coating could be ascribed to electroactive function of tetraaniline layer on α-Fe 2 O 3 .
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Hao Shan,Changbai Liu,Li Liu,Shouchun Li,Lianyuan Wang,Xiaobo Zhang,Xiaoqing Bo,Xiao Chi
Pure and La-doped (5 wt%, 7 wt% and 10 wt%) α-Fe 2 O 3 nanotubes are synthesized by an electrospinning method and followed by calcination . The as-synthesized nanotubes are characterized by scanning electron microscope (SEM) and X-ray powder diffraction (XRD). Compared with pure α-Fe 2 O 3 nanotubes, La-doped α-Fe 2 O 3 nanotubes exhibit improved acetone sensing properties at 240 °C. The response of 7 wt% La-doped α-Fe 2 O 3 nanotubes to 50 ppm acetone is about 26, which is 10 times larger than that of pure α-Fe 2 O 3 nanotubes. The response and recovery times of 7 wt% La-doped α-Fe 2 O 3 nanotubes to 50 ppm acetone are about 3 and 10 s, respectively. Moreover, 7 wt% La-doped α-Fe 2 O 3 nanotubes show a good selectivity to acetone.
研究领域:
材料科学
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2015
·
IF 2.752
Chang Su,Yongcun Zou,Xiaofeng Xu,Li Liu,Zhen Liu,Lili Liu
Pure and Nd-doped porous α-Fe 2 O 3 nanotubes were successfully synthesized via a facile single-capillary electrospinning method, followed by calcination treatment. The morphologies of the as-prepared samples were characterized by scanning electron microscopy. The crystal structures and components were determined by X-ray diffraction and energy-dispersive X-ray spectroscopy, respectively. The gas-sensing properties of the as-prepared samples were studied, and the results indicate the ultrahigh sensitivity of Nd-doped porous α-Fe 2 O 3 nanotubes to acetone. The response of Nd-doped porous α-Fe 2 O 3 nanotubes to 50 ppm of acetone is about 44 at an operating temperature of 240 °C, which is 17 times larger than that of pure porous α-Fe 2 O 3 nanotubes. Furthermore, the lowest detection limit of acetone is 500 ppb, with a response of 2.4. The response and recovery times to 50 ppm of acetone are about 19 and 50 s, respectively. In addition, the Nd-doped porous α-Fe 2 O 3 nanotubes possess good selectivity and long-term stability.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2022
·
IF 1.438
Lixia Chen,Qianqian Chen,Zhengyan Xue,Shanshan Liu,Shun Wang,Sankui Xu
The design and controllable synthesis of semiconductors at the nanoscale level is a critical strategy for adjusting the performance of catalysts. In this work, size-controlled α -Fe 2 O 3 with nanocubic structure is fabricated through a simple solvothermal method. The growth process of cubic α -Fe 2 O 3 nanocrystals is investigated by time-dependent solvothermal reaction experiments, which displays a typical Oswald ripening mechanism: flower-like nucleation, followed by growing and ripening of nuclei into different morphologies and sizes during the solvothermal process. The UV–vis absorption results revealed that α -Fe 2 O 3 nanocubes present a size-dependent optical property. The α -Fe 2 O 3 -10h with an average particle size of 37 nm exhibits good crystallinity, large specific surface area and high UV–vis light absorption, subsequently resulting in the highest photocatalytic efficiency together with excellent stability.
研究领域:
材料科学
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纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 12
·5319-5333
·
IF 4.5
Wang Yun,Tan Hongjie,Sang Lexian,Xie Yunying,Jia Fuchao,Zhou Tong,Yin Guangchao,Sun Fazhe,Wang Xiaomei
An optimized acetone gas sensor based on Ti 3 C 2 / α -Fe 2 O 3 (TF) composite materials was synthesized using microwave and etching methods. The structures, morphology and composition of the TF composites were characterized via XRD, XPS, SEM and TEM. The crystal of α -Fe 2 O 3 porous nanorods is hexagonal, and the α -Fe 2 O 3 nanoclusters formed from α -Fe 2 O 3 nanorods were adhered adequately on the lamellar Ti 3 C 2 MXene in the TF composite. The specific surface area and surface defects of the TF composites increased compared with pure α -Fe 2 O 3 nanocluster material, thus exposing a large number of gas adsorption sites. Furthermore, the excellent electrical conductivity and high free charges transfer ability of Ti 3 C 2 MXene provided more electrons for the gas-sensitive reaction and enhanced the transmission capacity of gas-sensitive reaction electrical signal, respectively. The Schottky barriers were formed at the interface of α -Fe 2 O 3 and Ti 3 C 2 MXene increasing the resistance of TF gas sensor in air, which is beneficial to the response of TF gas sensor. So, the gas-sensitive performance of TF gas sensor to acetone was greatly improved. The response of TF gas sensor to 100 ppm acetone was up to 23.38, which was nearly 2.3 times higher than pure α -Fe 2 O 3 gas sensor. The lower detection limit of TF gas sensor could be as low as 1 ppm. In addition, the TF gas sensor had excellent selectivity, long-term repeatability and stability for acetone.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2023
·
IF 7.3
Ruixue Wang,Kun Li,Narcisse Tsona Tchinda,Wenxing Wang,Lin Du
Ammonia (NH3), the most common alkaline gas in the atmosphere, participates in heterogeneous reactions on the surface of aerosols and produces ammonium (NH4+). While most previous studies have focused on the effect of NH3 on the heterogeneous reactions of other gases on mineral dust aerosols, little research has been done on the heterogeneous reactions of NH3 influenced by acidic gases. Here, the effects of sulfur dioxide (SO2), formic acid, acetic acid and acrylic acid on the heterogeneous reaction of NH3 on the surface of nano α-Fe2O3 particles were investigated. We found that NH3 can promote the dissolution of α-Fe2O3 through NH3–Fe complexation and be oxidized to NO3−, while the addition of acidic gas inhibits the NH3–Fe complex formation and converts it into physical adsorption. SO2 promoted the conversion of NH3 to NH4+, while weakly inhibiting the oxidation of NH3 to NO3− by competing for oxidation sites under light conditions. Organic acids, on the other hand, inhibited the heterogeneous conversion of NH3, and strongly competed for oxidation sites under light conditions, significantly reducing NO3− production. This study reveals the various influences of acidic gases on NH3 heterogeneous reactions on α-Fe2O3 particles, which helps to improve the understanding of atmospheric processes involving NH3, acidic gases, and mineral dust aerosols.
研究领域:
大气化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 38
·期 7
·2911-2916
·
IF 3.159
Er-tao Liu,Huiping Zhao,Hui Li,Guangfang Li,Yunling Liu,Rong Chen
Porous α-Fe2O3 nanostructures with different morphologies, such as rod-like, sphere-like and cube-like nanostructures, were successfully synthesized via a facile hydrothermal method. The obtained products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and nitrogen adsorption. It was found that iron precursors played a crucial role in the formation of porous α-Fe2O3 nanostructures. The porous α-Fe2O3 nanorods possessed largest BET surface area and ideal pore distribution, as well as exhibited excellent Cr(VI) removal capacity and a fast adsorption rate in a wide pH range. Moreover, porous α-Fe2O3 nanorods also showed excellent adsorptive ability for organic dyes.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）