ACS Nano
·
2025
·
IF 16
Hengdong Ren,Chensi Zhou,Ka Wang,Ximing Zhang,Lei Feng,Wenqing Wei,Yuqing Sun,Yukang Liu,Jun Dai,Xiaobing Xu,Zhiyong Zhang,Xinglong Wu
Interface polarization (one of the slow polarizations) is considered the primary mechanism driving microwave absorption (MA), but limitations in material composition and microstructure design often lead to weak interfacial polarization relaxation. In this work, we developed an interesting heterostructure consisting of carbon nanotube-encapsulated α-Fe2O3 nanocolumns (CNTs@α-Fe2O3). The curvature effects of CNTs induce a built-in electric field between CNTs and α-Fe2O3 nanocolumns, facilitating effective interface polarization. Under microwave irradiation, electron accumulation at the interfaces, driven by the energy-level mismatch between the two materials, further strengthens interface polarization, leading to a highly efficient MA performance. This heterostructured material achieves a minimum reflection loss of −74.1 dB at a thickness of 1.8 mm and an effective absorption bandwidth (reflection loss ≤ −10 dB) of 5.2 GHz (11.9 ∼ 17.1 GHz) at a thickness of only 1.5 mm. X-ray photoelectron spectroscopy and Raman scattering show a distinct blueshift in the Fe 2p binding energy and the A1g mode energy (exclusively associated with Fe atom vibrations), suggesting substantial charge transfer and redistribution at the interface associated with enhanced interface polarization. This work provides insights into interface polarization through the strategic design of energy levels and materials.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energies
·
2017
·Vol. 10
·期 9
·1296
·
IF 2.262
Yizhi Yan,Haolin Tang,Fan Wu,Rui Wang,Mu Pan
A cocoon-like α-Fe2O3nanocomposite with a novel carbon-coated structure was synthesized via a simple one-step hydrothermal self-assembly method and employed as supercapacitor electrode material. It was observed from electrochemical measurements that the obtained α-Fe2O3@C electrode showed a good specific capacitance (406.9 Fg−1at 0.5 Ag−1) and excellent cycling stability, with 90.7% specific capacitance retained after 2000 cycles at high current density of 10 Ag−1. These impressive results, presented here, demonstrated that α-Fe2O3@C could be a promising alternative material for application in high energy density storage.Keywords:one-step;self-assembly;α-Fe2O3;carbon coating;supercapacitors
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Chan Song,Guan-Yao Wang,De-Ming Kong
This work investigated the interactions of α-Fe 2 O 3 nanoparticles (NPs) with different structural nucleic acids and their fluorescence quenching ability towards fluorophore-labelled nucleic acid probes . Different from bulk α-Fe 2 O 3 samples, nanoscale α-Fe 2 O 3 particles exhibit the unique properties of strong adsorption and fluorescence quenching to fluorophore-labelled single-stranded DNA (ssDNA) probes. Based on these findings, a facile fluorescence method was developed for versatile quantification of nucleic acids. The size scale of NPs makes a significant impact on this sensing platform. Better selectivity was given by bigger NP (50–100 nm)-based nucleic acid-sensing platform compared with smaller NP (30 nm)-based one. In the 50–100 nm α-Fe 2 O 3 NP-based sensing platform, single nucleotide mismatch or single base-pair mismatch can even be effectively discriminated. The targets of micro-RNA (miRNA), ssDNA and double-stranded DNA (dsDNA) are sensitively detected with detection limits of 0.8 nM, 1.1 nM and 0.64 nM ( S / N =3), respectively. Significantly, α-Fe 2 O 3 NPs possess different affinities towards ssDNA probes with different lengths, and can be used as a universal quencher for ssDNA probes labelled with different fluorescent dyes . On the basis of these properties, the pristine α-Fe 2 O 3 NPs hold the potential to be widely utilized in the development of novel biosensors with signal amplification or simultaneous multiple target detection strategies.
研究领域:
生物化学
·
分子生物学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 18
·2579
·
IF 5.3
Yue Chang,Minmin Han,Yehui Ding,Huiyun Wei,Dawei Zhang,Hong Luo,Xiaogang Li,Xiongbo Yan
Effectively regulating and promoting the charge separation and transfer of photoanodes is a key and challenging aspect of photoelectrochemical (PEC) water oxidation. Herein, a Ti-doped hematite photoanode with a CoFe-LDH cocatalyst loaded on the surface was prepared through a series of processes, including hydrothermal treatment, annealing and electrodeposition. The prepared CoFe-LDH/Ti:α-Fe2O3photoanode exhibited an outstanding photocurrent density of 3.06 mA/cm2at 1.23 VRHE, which is five times higher than that of α-Fe2O3alone. CoFe-LDH modification and Ti doping on hematite can boost the surface charge transfer efficiency, which is mainly attributed to the interface interaction between CoFe-LDH and Ti:α-Fe2O3. Furthermore, we investigated the role of Ti doping in enhancing the PEC performance of CoFe-LDH/Ti:α-Fe2O3. A series of characterizations and theoretical calculations revealed that, in addition to improving the electronic conductivity of the bulk material, Ti doping also further enhances the interface coupling of CoFe-LDH/α-Fe2O3and finely regulates the interfacial electronic structure. These changes promote the rapid extraction of holes from hematite and facilitate charge separation and transfer. The informative findings presented in this work provide valuable insights for the design and construction of hematite photoanodes, offering guidance for achieving excellent performance in photoelectrochemical (PEC) water oxidation.
研究领域:
材料科学
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能源转换
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 9
·4272-4282
·
IF 3.925
Yu Lei,Huiqi Wu,Jianfeng Ma,Hao Cheng,Sridhar Komarneni
Layered α-Fe2O3/CuS nanoflowers with abundant active sites were synthesized by a hydrothermal method. The heterogeneous composite catalyst of α-Fe2O3/CuS nanoflowers exhibited a remarkable degradation capacity of 97.8% within 25 min for the Orange II (OII) dye under visible light, which was attributed to the synergistic effect of Na2S2O8 to generate ˙SO4− and ˙OH radicals. The initial pH tests revealed that this system showed better adaptability for its application in a wider pH range (pH = 3–9). In addition, the degradation of different azo dyes such as methylene blue (MB), Orange G (OG) and malachite green (MG) was also studied under the same conditions. The catalyst was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) to analyze its size, morphology, valence states of elements and chemical components. α-Fe2O3/CuS was further characterized using a vibrating sample magnetometer (VSM) and diffuse reflectance spectroscopy (DRS) to demonstrate its magnetic properties and light absorption capacity. Moreover, α-Fe2O3/CuS showed good recovery and reuse performance as a catalyst after four repeated cycles. A possible mechanism of degradation was proposed by quenching and ESR experiments, which revealed that the highly active species of ˙SO4−, ˙OH and ˙O2− enhanced the photocatalytic performance of the photocatalytic system.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 40
·405502
·
IF 3.953
Ziqin Zhuang,Li Zhang,Chaozhu Huang,Xiaohang Wang,Haichuan Guo,Tiju Thomas,Fengdong Qu,Pei Wang,Minghui Yang
Surface modification by employing precious metals is one of the most effective ways to improve the gas-sensing performance of metal oxide semiconductors. Pure α-Fe2O3 nanoparticles and Pt-modified α-Fe2O3 nanoparticles were prepared sequentially using a rather simple hydrothermal synthesis and impregnation method. Compared with the original α-Fe2O3 nanomaterials, the Pt-α-Fe2O3 nanocomposite sensor shows a higher response value (Ra/Rg = 58.6) and a shorter response/recovery time (1 s/168 s) to 100 ppm dimethyl disulfide (DMDS) gas at 375 °C. In addition, it has better selectivity to DMDS gas with the value of more than 9 times higher than the other target gases at 375 °C. This study indicates that the Pt-α-Fe2O3 nanoparticle sensor has good prospects and can be used as a low-cost and effective DMDS gas sensor.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Caixia Deng,Shuang Li,JiaYu Wang,Qiang Yang,Hui Chen,Fenglin Tang,Xiupei Yang
In this work, flower-like TiO 2 (TiO 2 -F) was first prepared by modulating the morphology of TiO 2 , and then, α-Fe 2 O 3 was loaded onto TiO 2 -F to successfully prepare α-Fe 2 O 3 /TiO 2 -F heterojunction materials. The material showed excellent degradation properties of doxycycline hydrochloride under visible light. The photocatalytic degradation efficiency of α-Fe 2 O 3 /TiO 2 -F2 for doxycycline hydrochloride under visible light reached 95.76 % in 120 min, and its pseudo-first-order degradation rate constant was 0.02647 min −1 , which was 3.68 and 2.01 times higher than those of α-Fe 2 O 3 and TiO 2 alone, respectively. This good photocatalytic performance is attributed mainly to the introduction of α-Fe 2 O 3 to form a Type II heterojunction with floral TiO 2 (TiO 2 -F), which is capable of promoting the separation of electron–hole pairs of photocatalysts and exhibiting a stronger redox capacity. The material exhibits notable stability and maintains high degradation efficiency even after undergoing multiple cycles. Furthermore, free radical trapping experiments and electron spin resonance (ESR) characterization revealed that hydroxyl radicals play a dominant role in this system. Finally, the degradation pathways were analyzed, and relevant toxicological analyses were performed, indicating that the toxicity of doxycycline hydrochloride gradually decreased during the photocatalytic degradation process.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yuxi Li,Zhuwei Zhu,Ximai Zhang,Fengkuan Ma,Qiaohong Zhang,Chen Chen,Hongying Lü
Selective oxidation of hydrocarbon under mild conditions is one of scientific challenges. In the present work, facet effect was utilized to design an efficient catalytic system of N -hydroxyphthalimide (NHPI) and specific α-Fe 2 O 3 with different preferential crystal facets. Higher ratio of crystalline facet {110}/{104} was identified as a key factor to facilitate the interaction between NHPI molecules and surface of α-Fe 2 O 3 , then realize a higher catalytic activity. Being photo-irradiated with the blue light (455 nm, 3 W) at ambient temperature for 4 h, conversion of 92.2% was obtained for the selective oxidation of ethylbenzene with α-Fe 2 O 3 -T100 that owns more preferential crystalline facets {110}, which is about 1.8 times as high as that (51.0%) being obtained with commercial C-α-Fe 2 O 3 -{104}. The present efficient catalytic system also exhibited good universality for the selective oxidation of a series of other hydrocarbons.
研究领域:
催化
·
材料科学
·
化学反应工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
·
2021
·
IF 5.277
Di Sun,Jin Mao,Zhijian Wang,Hui Li,Liangxiao Zhang,Wen Zhang,Qi Zhang,Peiwu Li
Peanut is an important resource of edible oil and digestible protein in daily life, which is rich in the nutriments and antioxidants such as vitamins, minerals and polyphenols. However, peanut is susceptible to the contamination of Aspergillus flavus ( A. flavus ), which can produce highly carcinogenic toxins that brings serious threats to human health and food safety. Exploring green and effective methods to control A. flavus is meaningful. Herein, a green and economical way to control A. flavus on peanuts was demonstrated. It was found that the growth of A. flavus hyphae and germination of its spores could be inhibited in the presence of α-Fe 2 O 3 nanorods under sunlight irradiation according to the agar diffusion method , flat colony counting method and fluorescence-based live/dead test. The diameter of inhibition zone was 22.3 ± 0.2 mm and the inhibition rate of spores germination was about 60 ± 5%, when the concentration of α-Fe 2 O 3 was 10 mg/mL for 7 h sunlight irradiation. Most important, α-Fe 2 O 3 showed the photocatalytic inhibition of A. flavus on peanuts under sunlight irradiation with the inhibition rate of about 90 ± 5%, and the production of aflatoxin B 1 and aflatoxin B 2 were reduced by 90 ± 2% and 70 ± 3%, respectively. By comparing the fat contents, protein contents, acid value, peroxide value and antioxidative compositions of peanuts, it was found that there was no obvious effect on the quality of peanuts after inhibition treatment. The findings provide a green, safe and economical strategy to control A. flavus on peanuts, which may be as a promising way to be used in food and agro-food preservation.
研究领域:
食品科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2023
·Vol. 76
·期 11
·774-784
·
IF 1.1
Fan-Ming Yang,Xi-Da Li
Rod-like porous α-Fe2O3 was synthesized by static hydrothermal treatment at 160°C and used as a symmetric supercapacitor. The phase information, structure, morphology, valence state and composition of the prepared sample were characterized using X-ray diffraction, infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and N2 adsorption–desorption. The results show that the prepared α-Fe2O3 is a rod-like porous material dominated by mesopores. Moreover, the α-Fe2O3 is a hexagonal single crystal with [FeO6] octahedrons and the interplanar crystal spacings are large enough for electrolyte ion diffusion. In both KOH and Na2SO4 electrolytes, the α-Fe2O3 sample displays good pseudocapacitance performance. However, the specific discharge capacity and energy density in KOH are larger than in Na2SO4. In 1molL–1 of KOH, remarkable capacities of 139 and 35.5Fg–1 are obtained and an energy density of 3.91 and 1.01Whkg–1 is achieved at 1 and 20Ag–1 respectively. After 10000 cycles, 87.7% of the specific capacitance is still retained at 1Ag–1. The good capacitance properties may attributed to the rod-like porous structure and large interplanar spacing, which provide good ion insertion–exit paths, enough oxidation–reduction active sites and a fast ion transfer velocity.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 38
·11984-11990
·
IF 6.641
Jing Yang,Jiaqiang Liu,Yan Xu,Xianliang Li,Junbiao Wu,Yide Han,Zhuopeng Wang,Xia Zhang
Template-controlled syntheses via metal–organic frameworks (MOFs) have emerged as a general strategy to fabricate metal oxides with tailored porous structures. Here, novel hierarchical SnO2/α-Fe2O3 hollow microcubes have been obtained by post-loading of Sn2+ ions on the surface of Fe4(Fe(CN)6)3 microcubes and a subsequent thermolysis route. The as-formed hierarchical SnO2/α-Fe2O3 composites exhibit remarkable selective acetone-sensing properties, in which the optimum composition of SnO2/α-Fe2O3 with Sn : Fe = 1.5 exhibits the best response towards 200 ppm acetone gas under the operating temperature of 270 °C (with gas response Ra/Rg = 9.3), with a fast response/recovery speed (6 s/7 s), as well as excellent reproducibility for at least 15 days without a significant change in response. The applied strategy provides a general and controllable method to access other hierarchically structured multi-metal oxide architectures with intriguing morphologies and adjustable sensing properties.
研究领域:
材料科学
·
化学传感器
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 19
·9704-9713
·
IF 5.968
Gang Liu,Quan Deng,Hongqiang Wang,Dickon H. L. Ng,Mingguang Kong,Weiping Cai,Guozhong Wang
Micro/nanostructured α-Fe2O3 spheres (MNFSs) were fabricated via a surfactant- and template-free method, involving the hydrothermal synthesis of FeCO3 precursor firstly and a subsequent thermal decomposition treatment. The product was characterized by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. The MNFSs had an average diameter of about 5 μm, and each contained subunits of interlinked and elongated particles with size less than 30 nm. The UV-Vis spectrum of MNFSs exhibited visible-light absorption. The visible-light photocatalytic activity of MNFSs was evaluated by using them to degrade the rhodamine 6G pollutant in water at ambient temperature under different parameters such as pH value, the amount of MNFSs and H2O2. We also found that the visible-light photocatalytic activity of MNFSs was higher than that of the micron- and nano-sized α-Fe2O3 particles. The reaction rate of MNFSs was more than twice that of nano-sized α-Fe2O3 and nearly 12 times faster than that of the micron-sized α-Fe2O3. This high photocatalytic feature of MNFSs was attributed to the high specific surface area together with their special porous structure. Importantly, these characteristics could control the rate of releasing ·OH and thus improve the utilization efficiency of ·OH. MNFSs can be easily recycled from the treated water using a magnet due to its magnetic behavior. There was no obvious decrease of the photocatalytic activity of MNFSs after being used.
研究领域:
材料科学
·
环境科学
✓ 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）