BIOSENSORS & BIOELECTRONICS
·
2015
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IF 6.409
Biyan Xu,Delun Zheng,Weiwei Qiu,Feng Gao,Shaoxiong Jiang,Qingxiang Wang
In this work, a novel electrochemical DNA biosensor has been developed based on the hybrid film of fern leaf-like α-Fe 2 O 3 microparticles and chitosan (CS). The fern leaf-like α-Fe 2 O 3 microparticles were synthesized via a facile template-free hydrothermal method, and their morphologies were characterized by X-ray diffraction, energy dispersive spectrometry, scanning electron microscope, and transmission electron microscope. Electrochemical characterization assays revealed that the hybrid film modified electrode had remarkable synergistic effects of the large accessible surface area and high electrical conductivity of semiconductive Fe 2 O 3 , and the good film stability of CS. Based on the rich amino groups on CS, the CS–Fe 2 O 3 hybrid film was employed as a functional matrix for probe DNA immobilization using terephthalaldehyde (TPA) as a bifunctional arm-linker. The hybridization capacity of the developed biosensor was evaluated with electrochemical impedance spectroscopy (EIS) using [Fe(CN) 6 ] 3−/4− as the indicating probe. A wide dynamic detection range from 1.0×10 −14 to 1.0×10 −10 M with ultralow detection limit of 5.6×10 −15 M was achieved for the target DNA. The hybridization selectivity experiments further revealed that the biosensor could discriminate fully complementary sequences from one-base mismatched, three-base mismatched, and non-complementary sequences. Moreover, the biosensor showed the advantage of good regeneration ability and reproducibility.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Jingtao Wu,Xiaodong Yue,Tianyu Wang,Yafeng Zhang,Yuan Jin,Guangli Li
Excessive intake of baicalein (BA) may lead to many adverse heathy risks. Hence, it is highly desirable to develop a convenient and sensitive method for the determination of BA. Herein, a low-cost and highly sensitive electrochemical sensor was fabricated for determination of BA in herbal medicine based on shuttle-shape α-Fe 2 O 3 nanoparticles decorated multiwalled carbon nanotubes (s-Fe 2 O 3 /MWCNTs). Various microscopic and spectroscopic methods confirmed the successful formation of s-Fe 2 O 3 /MWCNTs. CV and EIS techniques revealed that the s-Fe 2 O 3 /MWCNTs significantly improved the electroactive surface area and electron transport ability. Owing to the synergistic interactions between s-Fe 2 O 3 NPs and MWCNTs, the s-Fe 2 O 3 /MWCNTs exhibited superior electrocatalytic toward BA oxidation through a two electrons two protons pathway. Under optimal experimental conditions (accumulation potential of 0 V, accumulation time of 120 s, and pH of 6.0), The s-Fe 2 O 3 /MWCNT/GCE displayed a wide detection range from 0.001 to 10 μM with an ultrahigh sensitivity (6.154 μA μM −1 ) and extremely low limit of detection (0.2 nM). The s-Fe 2 O 3 /MWCNTs demonstrated strong anti-interfering ability against common potential interfering substances even at high concentration, and maintained stable peak current responses for at least 2 weeks. Furthermore, the s-Fe 2 O 3 /MWCNTs achieved the reliable detection of BA in traditional herbal medicine with satisfactory recovery (97 − 105 %). Considering their low cost, convenient operation, and comprehensive sensing performance, the s-Fe 2 O 3 /MWCNTs have demonstrated promising application prospects in sensitive detection of flavonoids.
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ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 35
·1803117
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IF 13.325
Qian Zhang,Qijie Liang,Qingliang Liao,Mingyuan Ma,Fangfang Gao,Xuan Zhao,Yiding Song,Lijuan Song,Xiaochen Xun,Yue Zhang
Raindrop falling, which is one kind of water motions, contains large amount of mechanical energy. However, harvesting energy from the falling raindrop to drive electronics continuously is not commonly investigated. Therefore, a self-cleaning/charging power system (SPS) is reported, which can be exploited to convert and store energy from falling raindrop directly for providing a stable and durable output. The SPS consists of a hydraulic triboelectric nanogenerator (H-TENG) and several embedded fiber supercapacitors. The surface of H-TENG is amphiphobic, enabling the SPS self-cleaning. The fiber supercapacitor which uses α-Fe 2 O 3 /reduced graphene oxide composite possesses remarkable specific capacitance, excellent electrical stability, and high flexibility. These properties of the fiber supercapacitor make it suitable for a wearable power system. A power raincoat based on the SPS is demonstrated as application. After showering by water flow, which simulates falling raindrops, for 100 s, the power raincoat achieves an open-circuit voltage of 4 V and lights a light-emitting diode for more than 300 s. With features of low cost, easy installation, and good flexibility, the SPS harvesting energy from the falling raindrop renders as a promising sustainable power source for wearable and portable electronics.
研究领域:
纳米能源
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柔性电子学
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可穿戴设备
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能源材料
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环境能量采集
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功能表面工程
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ACS Applied Materials & Interfaces
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2017
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IF 7.504
Xin Qi,Hao-Bin Zhang,Jiantie Xu,Xinyu Wu,Dongzhi Yang,Jin Qu,Zhong-Zhen Yu
A highly efficient and continuous high-pressure homogenization (HPH) approach is developed for scalable production of graphene sheets and sandwich-structured α-Fe2O3/graphene hybrids by liquid-phase exfoliation of stage-1 FeCl3-based graphite intercalation compounds (GICs). The enlarged interlayer spacing of FeCl3-GICs facilitates their efficient exfoliation to produce high-quality graphene sheets. Moreover, sandwich-structured α-Fe2O3/few-layer graphene (FLG) hybrids are readily fabricated by thermally annealing the FeCl3 intercalated FLG sheets. As an anode material of Li-ion battery, α-Fe2O3/FLG hybrid shows a satisfactory long-term cycling performance with an excellent specific capacity of 1100.5 mA h g–1 after 350 cycles at 200 mA g–1. A high reversible capacity of 658.5 mA h g–1 is achieved after 200 cycles at 1 A g–1 and maintained without notable decay. The satisfactory cycling stability and the outstanding capability of α-Fe2O3/FLG hybrid are attributed to its unique sandwiched structure consisting of highly conducting FLG sheets and covalently anchored α-Fe2O3 particles. Therefore, the highly efficient and scalable preparation of high-quality graphene sheets along with the excellent electrochemical properties of α-Fe2O3/FLG hybrids makes the HPH approach promising for producing high-performance graphene-based energy storage materials.
研究领域:
材料科学
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纳米技术
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储能
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电化学
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化学工程
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xiongfang An,Yang Chen,Minghui Ao,Yahui Jin,Liwei Zhan,Bing Yu,Zhansheng Wu,Peikun Jiang
Photocatalysis is regarded as one of the most promising techniques for degrading organophosphorus pesticides (OPs) from wastewater given its low-cost and environmental benignity. Yet, photocatalytic degradation of OPs is an incomplete process, since PO 4 3− is produced after photocatalysis. Here, biochar-supported α-Fe 2 O 3 /MgO composite (BC-α-Fe 2 O 3 /MgO) is developed for sequential photocatalytic degradation of OPs and recovery of the produced PO 4 3− . The degradation efficiency of N-phosphonomethyl iminodiacetic acid (NPA) by BC-α-Fe 2 O 3 /MgO based photocatalysis reaches 90.1% within 80 min, and the recovery ratio of the produced PO 4 3− by BC-α-Fe 2 O 3 /MgO is as high as 82.3%. Besides, the as-prepared BC-α-Fe 2 O 3 /MgO used in this integrated photocatalysis and adsorption process maintain a high stability towards NPA degradation and PO 4 3− recovery during five cycling experiments. The mechanistic study reveals that holes, •OH, and • O 2 – radicals generated in the photocatalytic process are responsible for NPA degradation. UV light can activate persistent free radicals on BC-α-Fe 2 O 3 /MgO surface, which provide O 2 with electrons for the generation of • O 2 – and subsequent yield of •OH. Moreover, the presence of α-Fe 2 O 3 and MgO on the surface of biochar leads to the excellent P adsorption performance of BC-α-Fe 2 O 3 /MgO. This study opens new possibilities for the recovery of P resource from organophosphorus polluted wastewater.
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MICROCHIMICA ACTA
·
2016
·Vol. 184
·期 1
·137-145
·
IF 4.831
Dai Liming,Du Xiaojiao,Jiang Ding,Chen Wei,Zhu Mingyue,Wang Kun
The authors have coupled ultrafine α-Fe 2 O 3 nanocrystals to N-doped graphene (NG) to obtain a novel material for use in a photoelectrode. The presence of NG is shown to strongly affect the morphology and size of the α-Fe 2 O 3 nanocrystals formed on the NG sheets, and to improve their photoelectrochemical (PEC) activity. Interestingly, the PEC performance of the nanocomposite is closely correlated to the size of the α-Fe 2 O 3 nanocrystals in that small nanocrystals display better PEC properties. The photocurrent of α-Fe 2 O 3 -NG is nearly 3.3-fold stronger than that of α-Fe 2 O 3 nanocrystals. Based on the remarkable PEC performance of this nanocomposite, a PEC sensor was constructed for the sensitive determination of 1,4-dihydroxybenzene (HQ). Its photocurrent increases with the HQ concentration in the range from 3.0 nM to 3.3 μM, and the detection limit is 1.0 nM (at an S/N ratio of 3). In our perception, the study presented here can serve as a basis for a better understanding of the relationship between morphologies and PEC performance of such nanomaterials. Conceivably, it may be extended to other PEC sensing system and to other fields associated with nanotechnology.
Ultrafine α-Fe 2 O 3 nanocrystals were prepared via coupling with N-doped graphene (NG) substances (α-Fe 2 O 3 -NG). They exhibit superior photoelectrochemical (PEC) performance and have been successfully utilized for PEC-based sensing.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Zhenyu Yan,Wenyu Gao,Chenkai Zhong,Qiangqiang Jiao,Shujie Tian,Jia Liu
Ammonia (NH 3 ) plays an important role in agricultural production and is also an ideal zero-carbon energy source in sustainable hydrogen economy. Electrocatalytic nitrate (NO 3 - ) reduction reaction can simultaneously consume nitrogen pollutants in water during the synthesis of NH 3 , which is the most promising and gentle alternative process to the Haber-Bosch. However, due to the interference of hydrogen evolution reaction and high overpotential, the development of efficient directional ammonia conversion catalysts has become the key. In this study, Mo-Fe 2 O 3 material were fabricated by crystal face engineering and orbital manipulation strategies. The (001) face of α-Fe 2 O 3 with the best electrochemical performance was exposed by thermodynamic control, and the in-situ substitution of Mo single atoms for near-surface Fe atoms was further used to achieve excellent ammonia synthesis activity. NH 3 yield of 493.67 μg/h/mg cat and Faraday efficiency of 95.0% were achieved at -0.5 V vs. RHE (pH=7, 0.1 M PBS+500 ppm NO 3 - ). The mechanistic analysis showed that the highly electronegative Mo atoms induced strong interaction by Fe-O-Mo bond, which prompted Fe(III) to preferentially fill the lower t2g orbital and form a low-spin state. The weaker anti-bonding state enhances the interaction between Fe(III) and the coordinating O atoms in NO 3 - , thereby strengthening electron transfer. In summary, the targeted regulation of the crystal facet and electronic orbitals of catalysts presents a promising strategy for enhancing the conversion of NO 3 - to NH 3 .
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Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-11
·
IF 3.159
Zhang Jijun,Chen Zexiang,Wang Yan,Yan Xinyu,Zhou Zhiyu,Lv Huifang
High electrochemical performance of asymmetric supercapacitor (ASC) depends on exquisite nanostructure design and synthesis of electrodes, including structural controllable design and synthesis of high theoretical performance materials and nanocomposite materials. Herein, a template-free hierarchical core-shell nanostructure of CoNiO 2 @NiAl-layered double hydroxide (NiAl-LDH) and α-Fe 2 O 3 with a hollow spherical structure composed of nanoparticles are successfully prepared. The CoNiO 2 @NiAl-LDH as the cathode electrode and the hollow spherical α-Fe 2 O 3 as the anode electrode of the ASC devices exhibit superior electrochemical performance. The gel of polyvinyl alcohol (PVA) and KOH acts as the solid electrolyte and the separator to assemble into the all-solid-state flexible ASC devices. Two of the CoNiO 2 @NiAl-LDH//α-Fe 2 O 3 ASC devices in series are fabricated to meet the voltage requirement of mobile energy equipment, which exhibit a maximum energy density of 65.68 Wh kg −1 at the power density of 369.45 W kg −1 . Interestingly, in addition to many advantages that the solid electrolyte in ASC devices already have, we find that it can be an alternative way of solving the problem of iron oxide cycling performance, and of course it can also be used as a reference for other materials with poor cycling performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Wisal Muhammad,Nazma Faqir,Muhammad Asif Khan,Zaheen Ullah Khan,Bilal Ahmad,Muhammad Jawad Ahmad,Amir Zada,Fawad Ali,Sajid Nadeem,Muhammad Zaka Ansar,Wajid Ali
Developing an efficient visible-light-driven photocatalysts for conversion of atmospheric CO 2 into valuable fuels is a promising strategy to mitigate the escalating greenhouse gas, environmental, and energy crisis. This study presents an innovative design for a cascade Z-scheme comprising of dimensional matched SnO 2 -α-Fe 2 O 3 /g-C 3 N 4 (SO-FO/CN) nanosheets heterojunction. In this configuration, SnO 2 functions as an optimal energy platform that not only facilitates charge transfer and separation but also sustains sufficient thermodynamic energy for redox reactions and inhibits the undesired type-II charge transfer pathway. The optimized cascade Z-scheme exhibits a remarkable 20-fold improved photoactivity for CO 2 conversion to CH 4 and CO compared to bare g-C 3 N 4 (CN). It also shows significantly improved photocatalytic activity for the degradation of toxic organic pollutants, 2,4-dichlorophenol (2,4-DCP) ∼6.6-fold and bisphenol A (BPA) ∼4.2-fold, respectively. The improved photocatalytic activity results from effective charge separation facilitated by the Z-scheme, along with a favorable energy platform and extended charge lifetime. This innovative strategy, which utilize an energy platform, presents a promising approach for designing an efficient Z-scheme heterojunction photocatalysts for solar-to-fuel conversion and pollutant degradation.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shi-Wen Lv,Qiuyu Zheng,Lingjie Ye,Chun-Yang Li,Jing-Min Liu,Yanqing Cong,Shuo Wang
Nowadays, simultaneous removal of organic pollutants and heavy metals from wastewater is still a complicated task with great challenge. Herein, a newly-designed Fe-g-C 3 N 4 /α-Fe 2 O 3 composite with an active N-Fe-O bridge was prepared by coupling Fe-doped g-C 3 N 4 (namely Fe-g-C 3 N 4 ) and α-Fe 2 O 3 . Interestingly, the combination of Fe-g-C 3 N 4 with α-Fe 2 O 3 broadened the light absorption region and restrained the photoinduced electron-hole pair recombination. Meanwhile, elaborate construction of N-Fe-O bridges based on coordination interaction can reduce electrochemical impedance and facilitate electron transfer, thereby prolonging the charge lifetime. As expected, the Fe-g-C 3 N 4 /α-Fe 2 O 3 composite displayed excellent photocatalytic performance in simultaneous removal of tetracycline (TC) and Cr(VI). More importantly, Fe-g-C 3 N 4 /α-Fe 2 O 3 -mediated electron transfer from TC to Cr(VI) also played an essential role on TC oxidation and Cr(VI) reduction under visible light. Both experimental analyses and theoretical calculations revealed that the migration route of photogenerated carriers followed a direct Z-scheme heterojunction mechanism under built-in electric field. The Fe-g-C 3 N 4 /α-Fe 2 O 3 composite with great stability also displayed promising practical application potential. In short, the current work not only provided a highly-efficient photocatalyst with N-Fe-O bridges but also shared new insights into the simultaneous removal of organic pollutants and heavy metals.
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ACS Sensors
·
2025
·
IF 9.1
Xiao Ma,Rong Tan,Hong Chen,Jiawei Zhang,Lei Ge,Tingting Zhao,Xinyu Wang,Kaikai Yuan,Hairui Fang,Dong Wang
Nitrogen dioxide (NO2), the main component of pollutants in atmospheric environments, causes and exacerbates respiratory diseases, especially during outdoor sports even at the 100 ppb level. Currently, environmental gas detection still faces challenges such as high detection limits, low SNR, and low sensitivity. A NO2 sensor based on In(OH)3-α-Fe2O3–ZnO was prepared using a hydrothermal method, featuring an ultralow detection limit of 82 ppt, an exceptionally high SNR of 574,000, and an ultrahigh sensitivity of 252.25 mV/ppm (100 ppb to 1 ppm). And this sensor exhibits excellent response, selectivity, and repeatability. These excellent sensing characteristics come from the adsorbed oxygen on the surface of the material with the formation of n–n heterojunctions. Additionally, a low-power, portable, and cost-effective environmental monitoring system (named Smart Breath Sentinel (SBS)) was designed to intelligently upgrade ordinary masks. SBS enables real-time wireless environmental gas monitoring with integrated humidity compensation to ensure accurate measurements in high-humidity environments. SBS has already been tested in multiple environments, and the test results have proven the feasibility of SBS. This sensor based on In(OH)3-α-Fe2O3–ZnO demonstrates significant potential for applications aimed at enhancing human safety.
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