SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Shendan Zhang,Mingjie Yang,Kunyu Liang,Ayse Turak,Bingxue Zhang,Da Meng,Chuanxi Wang,Fengdong Qu,Wenlong Cheng,Minghui Yang
Nanosized Pt-loaded Fe 2 O 3 nanocubes are prepared through, successively, a simple hydrothermal reaction, two-step annealing process and finally reduction with NaBH 4 of H 2 PtCl 4 . The resultant Pt decorated Fe 2 O 3 nanocubes, made up of Fe 2 O 3 nanoplatelets, are hierarchical, hollow and porous, with an average edge length of 200–300 nm. The sensor based on Pt decorated Fe 2 O 3 nanocomposites exhibits higher response (R air /R gas = 25.7) to 100 ppm of acetone gas at lower temperature (139 °C), with a short response-recovery time (3 s/22 s), compared with pure Fe 2 O 3 nanocubes sensor. The Pt-Fe 2 O 3 nanocomposite sensor shows excellent potential to act as a low cost, low temperature sensor for acetone gas, with high acetone selectivity under high humidity conditions and with the interference of other gases. Under various environmental conditions designed to mimic exhaled air, the sensor is able to detect ppb amounts of acetone, with high repeatability and stability, making it suitable for applications such as oral diabetic sensors. The attractive chemical and electronic sensitizations of partially oxidized Pt nanoparticles are responsible for the enhancement of acetone sensing performance. Based on the high acetone selectivity, high stability and fast dynamic response, the Pt enhanced Fe 2 O 3 nanocubes sensor is an exceptionally suitable candidate for a low cost acetone sensor, and the proposed approach provides a route to develop gas sensors that can operate at low temperatures for a wide variety of applications.
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Nano Research
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2018
·Vol. 12
·期 2
·381-388
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IF 7.994
Xu Jiangtao,Li Xiaoting,Wang Yuxiang,Guo Ronghui,Shang Songmin,Jiang Shouxiang
Cap-like α-Fe 2 O 3 films are fabricated and deposited onto quartz fabric by using radio frequency magnetron sputtering and annealing. The treated fabric sample in this study shows highly sensitive surface-enhanced Raman scattering (SERS) and excellent flexibility, reproducibility and stability. In addition, the sample can be recovered after a washing process with an organic solvent and repeatedly used. The sensitive SERS performance is attributed to chemical enhancement through a charge transfer process. Moreover, the SERS performance is also found to be dependent on the light coupling effect. When the light absorbance rate of the α-Fe 2 O 3 films increases at a wavelength near that of laser light, the film shows excellent sensitivity due to light coupling effect.
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2018
·
IF 2.207
Hui Liu,Zhi-Guang Zhang,Xiao-Xiong Wang,Guang-Di Nie,Jun Zhang,Shan-Xiang Zhang,Ning Cao,Shi-Ying Yan,Yun-Ze Long
Highly flexible Fe 2 O 3 /TiO 2 composite nanofibers were successfully synthesized via electrospinning followed by high-temperature calcination . The morphologies and structures of Fe 2 O 3 /TiO 2 nanofibers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and ultraviolet-visible (UV-Vis) spectroscopy, and their optical properties , photocatalysis and photodetection properties were also measured. The flexible nanofibers possess large specific surface area, and can be recycled by a magnet. Moreover, the absorption region has been extended from the UV region to the visible region, improving the performance of photocatalyst under visible light radiation . In addition, the formation of Fe 2 O 3 /TiO 2 heterostructures suppresses the recombination of photogenerated electron-hole pairs, which also improves the photocatalyst behavior. Particularly, these nanofibers can also work as a sensitive UV detector, which offers in situ monitor method of such photocatalysis materials.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Desheng Yang,Chaofei Bai,Jiaran Liu,Shengnan Li,Chengzhao Tu,Fengdan Zhu,Guoping Li,Yunjun Luo,Tianfu Zhang
The construction of ordered pore structure and heterostructure interface is considered as an effective strategy to optimize the activity and stability of nano catalysts. Herein, we have elaborately fabricated the p-n heterostructure nanocatalysts of three-dimensionally ordered macroporous (3DOM) Fe 2 O 3 -supported 2D copper oxide nanofilm using a simple impregnation method, abbreviated as 3DOM-Fe 2 O 3 /CuO. The prepared 3DOM Fe 2 O 3 /CuO shows interconnected and ordered macroporous channels, which provide considerable catalytic active sites and enrich the reactive oxygen concentration at the Fe 2 O 3 -CuO heterostructure interface. By adjusting the copper source concentration, 2D copper oxide nanofilm with varied thicknesses was introduced to readily regulate the morphology of the catalyst and the atom composition or electronic structure of the interface. When evaluated as a catalyst for ammonium perchlorate (AP) decomposition reaction, 3DOM-Fe 2 O 3 /CuO-3 testified the most satisfactory catalytic activity, reducing the high temperature decomposition peak of AP decreased by 105.27 °C and the decomposition activation energy (Ea) by 50 %. Based on the experimental results of this study and related theoretical researches, the following mechanisms are proposed: in the thermal decomposition process of AP, the generation of active oxygen is not only related to the active oxygen mechanism, but also may be related to the NO 2 -assisted mechanism.
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NANO
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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.
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Water Science and Engineering
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2022
·
IF 0
Jian-hong Han,Wen-hui Jia,Yi Liu,Wei-da Wang,Lian-ke Zhang,Yu-mei Li,Peng Sun,Jian Fan,Shu-ting Hu
Given the difficulties of degrading benzotriazole (BTA), this study used a one-pot hydrothermal method to prepare α-Fe 2 O 3 /Cu 2 O (FC) composites for photoelectrocatalytic (PEC) degradation of BTA. The characterization of FC structure showed that Cu 2 O in cubic crystals was loaded with circular sheets of Fe 2 O 3 . Owing to this structure, FC showed efficient PEC degradation of BTA when exposed to ultraviolet light. The experimental results demonstrated that FC efficiently degraded BTA. When the PEC degradation continued for 60 min, 100% degradation of BTA was achieved because FC enhanced the photoelectron-hole separation and the separation and transfer of articulated carriers. High performance liquid chromatography–mass spectrometry showed that intermediates formed during the PEC degradation of BTA. Finally, various pathways for degradation of BTA were postulated. This FC-based PEC system provides a harmless and effective method for degradation of BTA.
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Applied Materials Today
·
2021
·
IF 10.041
Jie Yang,Yong Liu,Jia Li,Min Zuo,Wenzheng Li,Ningning Xing,Chengyan Wang,Tingting Li
Micromotors have hold great promise for environmental remediation. Herein, we reported a novel γ-Fe 2 O 3 @Ag-mSiO 2 NH 2 magnetic Janus micromotor for dynamic removal of heavy metal ions and organic pollutants from water. The as-prepared Janus micromotors displayed unique core-shell structure composed of amino-functionalized meso‑SiO 2 shell and γ-Fe 2 O 3 magnetic core, and could be propelled by O 2 bubbles generated by Ag-catalyzed decomposition of H 2 O 2 . This Janus micromotor could move with a high velocity of 203.06 ± 10.6 μm s −1 (about 253.8 body lengths s –1 ) in 10 wt.% H 2 O 2 solution. γ-Fe 2 O 3 @Ag-mSiO 2 NH 2 magnetic Janus micromotor showed much higher removal capacities for Cu 2+ (15.59 mg g −1 ) and doxycycline (31.45 mg g −1 ) than its static control samples due to the synergy of self-propulsive movement and amino-functionalized porous core-shell structure. Furthermore, the magnetic γ-Fe 2 O 3 cores enabled the remote magnetic control on the movement direction and magnetic recycling. This work provides a new strategy for environmental pollutants treatment.
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高影响因子
Materials Today Chemistry
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2021
·
IF 8.301
H. Zhang,J. Xu,S. Wang,Q. Liu,X. Kong
Iron-based nanostructured materials are desirable for various applications owing to their high magnetization. Herein, we presented a facile fabrication of free-standing γ-Fe 2 O 3 nanosheets by a molten salt method for microwave absorption. Furthermore, Al component was incorporated to serve as the template for hole production. The designed holey γ-Fe 2 O 3 nanosheets were effective to maximize the usage of nanomaterials, thereby providing larger surface area, richer defects, and more polarization centers. Both experimental measurements and electric field simulation showed an enhanced capability for microwave absorption using holey γ-Fe 2 O 3 when compared with its intact counterpart. Oxygen vacancy was generated during the hole evolution, which significantly improved the electrical conductivity and thus promoted the conductive loss mechanism. In addition, the holey configuration may extend the transmission path of microwave and confer it with multiple reflection and scattering within the absorbent matrix. Meantime, the polarization loss was strengthened owing to Al modulation associated with the induced defect sites. With the improvement in conductive loss, polarization, impedance matching, and attenuation constant, the as-synthesized holey γ-Fe 2 O 3 exhibited promising microwave absorbability, with a maximum reflection loss of 52.4 dB and an effective bandwidth of 5.12 GHz at a thickness of 2.2 mm, overperforming most pure Fe-based materials.
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ENERGY & FUELS
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2020
·
IF 3.421
Xiaolin He,Biyun Lin,Liqin Yang,Chaoqun Shang,Shanshan Li,Zhihong Chen,Xin Wang
As an ideal photocatalyst in the photoelectrochemical (PEC) water oxidation area, hematite (α-Fe2O3) has received much attention from scientists on account of its favorable band gap and excellent stability in alkaline media. However, the practical photocurrent yield of α-Fe2O3 is much less than the theoretical value because of the high charge recombination and the low charge transport. Herein, a novel ferroelectric Fe2O3/Pb(Zr0.2Ti0.8)O3 photoanode (Fe2O3/PZT) was fabricated by simple spin coating along with a one-step calcination method for the first time. As expected, the Fe2O3/PZT photoanode showed a significantly greater photocurrent (by ∼10 times) and the initial potential (by ∼100 mV) was more negative than that of the pure Fe2O3 nanorod photoanode, which was attributed to the depletion layer width increase and the upward band bending in Fe2O3 induced by ferroelectric polarization of PZT, leading to efficient charge separation and injection. Moreover, the photoelectrochemical performance of the Fe2O3/PZT nanorod photoanode could be regulated by simply changing the polarization direction of PZT. In addition, the Fe2O3/PZT nanorod photoanode showed not only a fast and repetitive light response but also long-term stability for 96 h. This research presents a novel route to enhance the efficiency of charge separation and affords theoretical guidance for preparing the high-efficiency PEC photoanodes and the switchable control of the photoelectrochemical response.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 13
·9176-9185
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IF 4.449
Xin Li,Huiming Lin,Xiang Chen,Hao Niu,Jiuyu Liu,Ting Zhang,Fengyu Qu
The design and synthesis of unique novel heterostructures for high-performance photocatalytic activity has exerted a tremendous fascination and has recently attracted intensive attention. In this work, a branch-like α-Fe2O3/TiO2 heterostructure has been synthesized controllably through an electrospinning method combined with a hydrothermal approach. The backbone of the heterostructure is composed of a 3D porous TiO2 nanofiber (∼70 nm in diameter) network with plenty of α-Fe2O3 nanorods (100–200 nm in length) deposited on them. The novel branch-like nanocomposites have an abundantly porous structure as well as large surface areas (up to 42.8 m2 g−1). In addition, their visible light photodegradation behaviour towards organic dyes, including Congo red (CR), methylene blue (MB), eosin red (ER) and methyl orange (MO), was investigated. Their excellent photocatalytic performances are attributed to their large surfaces, improved visible light absorption and high separation efficiency of the photogenerated electrons/holes. Furthermore, the degradation process was further studied by varying the amount of α-Fe2O3 deposited. The sample α-Fe2O3/TiO2-3 possessed the best performance to efficiently decolor CR solution even at a high concentration of 50 mg L−1 (160 min, 94 mg g−1), ascribed to the high adsorption capacity derived from the large surface, strong electrostatic interaction and structural match between α-Fe2O3/TiO2-3 and CR. These α-Fe2O3/TiO2 heterostructures exhibit great potential for decontamination of organic pollutants in waste water under visible light.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
·
IF 3.205
Yuangang Li,Juan Feng,Huajing Li,Xiaoliang Wei,Rongrong Wang,Anning Zhou
Solar splitting of seawater is one of the promising ways for large scale utilization of solar energy in the future. Here we reported an efficient and stable photoanode based on earth-abundant materials for photoelectrochemical (PEC) splitting of natural seawater. Through simple hydrothermal growth and deposition-annealing (DA) process, α-Fe 2 O 3 /WO 3 nanorod arrays were grown on the surface of fluorine-doped tin oxide coated glass. The PEC performance can be optimized simply by varying DA cycles. The photocurrent density reaches about 1 mA/cm 2 at 1.23 V vs RHE under the illumination of 100 mW/cm 2 (AM 1.5G) which is 2.9 times as that of pure WO 3 films and 50 times as that of the pristine Fe 2 O 3 NRs under the same conditions. More importantly, when the materials were used as photoanode for PEC splitting of natural seawater, the performance was kept as well. After 5 h continuous illumination 65% of the initial value of photocurrent density still remained, which imply the good photostability of the materials even at the conditions of PEC splitting of seawater. A possible mechanism for the improved performance of the hybrid photoanode was proposed based on our experimental results.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Yan Zheng,Xiao Zhang,Jie Zhao,Ping Yang
α-Fe 2 O 3 /BiOCl heterojunctions were synthesized by growing and assembling α-Fe 2 O 3 nanoplates to BiOCl microflowers via a two-step route to enhance the photocatalytic performance of BiOCl. The morphology, microstructure, element composition and optical properties of α-Fe 2 O 3 /BiOCl heterojunctions have been investigated by SEM, TEM, XRD, FT-IR, Raman spectra, XPS, UV–vis diffuse reflectance and PL spectra. Electrostatic interaction was a key to form α-Fe 2 O 3 /BiOCl heterojunctions. Compared with pure BiOCl, the synthesized α-Fe 2 O 3 /BiOCl heterojunctions possess an efficient visible light absorption and exhibit an improved of photocatalytic efficiency. A photocatalytic degradation mechanism has been proposed to explain that the heterojunctions enhance the separation efficiency of electron-hole pairs, and the holes are the main reactive species in the degratation of Rhodamine B.
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