SENSORS
·
2022
·Vol. 22
·期 8
·3015
·
IF 3.847
Jingjiang Wei,Rongjie Wang,Fei Pan,Zhengyi Fu
Hydrogels of flexibility, strength, and conductivity have demonstrated broad applications in wearable electronics and soft robotics. However, it is still a challenge to fabricate conductive hydrogels with high strength massively and economically. Herein, a simple strategy is proposed to design a strong ionically conductive hydrogel. This ion-conducting hydrogel was obtained under the synergistic action by salting out the frozen mixture of polyvinyl alcohol (PVA) and graphene oxide (GO) using a high concentration of sodium chloride solution. The developed hydrogel containing only 5 wt% PVA manifests good tensile stress (65 kPa) and elongation (180%). Meanwhile, the PVA matrix doped with a small amount of GO formed uniformly porous ion channels after salting out, endowed the PVA/GO hydrogel with excellent ionic conductivity (up to 3.38 S m−1). Therefore, the fabricated PVA/GO hydrogel, anticipated for a strain sensor, exhibits good sensitivity (Gauge factor = 2.05 at 100% strain), satisfying working stability (stably cycled for 10 min), and excellent recognition ability. This facile method to prepare conductive hydrogels displays translational potential in flexible electronics for engineering applications.Keywords:polyvinyl alcohol;graphene oxide;conductive hydrogels;strain sensors;salting out
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高影响因子
ANALYTICAL LETTERS
·
2022
·
IF 2.267
Wentang Zhao,Mei Wu,Lisha Mei,Hongling Li
An ultra-sensitive electrochemical immunosensor for detecting carcinoembryonic antigen was prepared. Graphene oxide-gold was used as the substrate modifier of the sandwich immunosensor. The high conductivity of graphene oxide effectively enhanced the electron transfer rate. The large specific surface area of graphene and the biocompatibility of gold nanoparticles increased the number of primary antibodies. The bovine serum albumin coated silver – platinum composite was used as a secondary antibody tag to prepare signal probes. The excellent biocompatibility of bovine serum albumin increased the number of secondary antibody connections. Silver nanoparticles increased the speed of electron transfer, and platinum further enhanced electrochemical sensing capabilities by catalyzing hydrogen peroxide. The immunosensor showed good performance for detecting carcinoembryonic antigen. Under the optimal conditions, the dynamic response range for carcinoembryonic antigen was from 0.005 ng·mL−1 to 100 ng·mL−1 with a detection limit of 0.76 pg·mL−1. The immunosensor also shown high selectivity, suitable stability, and good reproducibility, which provides new capabilities for clinical carcinoembryonic antigen detection.
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Materials Today Chemistry
·
2022
·
IF 7.613
Zahra Ansarian,Alireza Khataee,Samira Arefi-Oskoui,Yasin Orooji,Hongjun Lin
Herein, Ti 3 GeC 2 MAX phase was synthesized using the reactive sintering method and characterized via various techniques. The X-ray diffraction pattern confirmed the successful synthesis of the MAX phase in the hexagonal crystal structure with high purity. Based on the field-emission scanning electron microscopy and high-resolution transmission electron microscopy analysis, layered morphology with the compacted structure was observed. The catalytic activity of the MAX phase was evaluated for activation of peroxydisulfate (PDS) under ultrasound (US) irradiation. Ti 3 GeC 2 MAX phase (0.2 g/L) with a bandgap of 1.72 eV demonstrated high capability to activate 0.15 mmol/L of PDS under US irradiation, resulting in 94.7% removal efficiency within 80 min of reaction time. The removal of diverse types of pollutants such as dimethyl phthalate, hydroxychloroquine, and mefenamic acid confirmed the high performance of the Ti 3 GeC 2 /PDS/US ternary system. The quenching tests indicated that both radical and non-radical pathways are involved in the degradation process, and O 2 • − , O • H , S O 4 • − , and O 2 1 were recognized as critical species. In addition, a probable degradation mechanism was proposed. The results provide a promising perspective for the application of MAX phase-based materials in the ternary catalyst/oxidant/US systems for the efficient treatment of organic contaminants. To the best of our knowledge, the present work is the first effort to make use of the Ti 3 GeC 2 MAX phase as a desirable catalyst for the removal of organic pollutants applying the catalyst/PDS/US ternary system.
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RSC Advances
·
2022
·Vol. 12
·期 13
·7950-7960
·
IF 4.036
Chuanxiang Zhang,Xiqiang Li,Lingling Ding,Chen Jin,Haijun Tao
Perovskite solar cells (PSCs) are considered to be ideal energy devices, where perovskite-type organic metal halides act as light-absorbing materials. In PSCs, the photoexcitons are extracted and separated to afford high photoelectric conversion efficiency under the action of the built-in electric field (Ebi). However, the current challenge is that a low Ebi cannot provide a sufficient driving force to separate photonic excitons, which causes the captured charges to escape from the deep energy-level defect state. Here, the ferroelectric material barium titanate (BaTiO3) was directly introduced into the perovskite precursor solution to reduce the defection density (to 8.58 × 1017 cm−3) in PSCs and promote the separation of photoexcitons. Furthermore, the addition of BaTiO3 improved the quality of the perovskite film and significantly increased the photoelectric performance after the polarization treatment. This is mainly attributed to the residual polarization electric field generated by ferroelectric polarization, which increased the Ebi of the PSCs and the width of the depletion layer and inhibited the non-radiative recombination of carriers. This work provides a possibility to design and develop optoelectronic devices with high-efficiency optoelectronic response behavior.
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Materials Today Nano
·
2022
·
IF 13.364
J. Wu,P. Wu,X. Weng,J. Lin,G. Owens,Z. Chen
Recently, the green synthesis of iron nanoparticles and associated hybrids using plant extracts has attracted much attention due to its low cost, simplicity and environmental friendliness . However, the exact formation mechanism is still unclear. In this study, the one step green synthesis of hybrid rGO/Fe NPs by a tea extract was examined using a response surface methodology (RSM) to obtain a high activity of rGO/Fe NPs. The results showed that the best conditions for synthesis were an extract concentration = 35 g/L, pH = 7, and temperature = 30 °C. The optimized hybrid produced could remove 99.9% of mitoxantrone (MTX) compared to only 78.9% when unoptimized. To better understand the formation process, characterizations by SEM , TEM, AFM , FTIR, XRD , Raman, and XPS were performed. Theses characterizations showed that the Fe NPs produced had a particle size of 25 nm which were deposited randomly across the rGO nanosheet with a thickness of approximately 1.5 nm, indicating that stable hybrid rGO/Fe NPs were successfully synthesized, where the green tea extract exhibited both reducing and capping/stabilizing behavior. Furthermore, the specific biomolecules in the green tea extract responsible for bio-reduction and stabilization were identified by GC-MS and LC-MS, which showed that catechins were the main reducing agents, while alkaloids, amino acids and phenolic acids were the main capping/stabilizing agents. Finally, a mechanism for synthesizing rGO/Fe NPs was proposed, where the polyphenols successfully reduced GO and complexed with iron ions to form amorphous ferric (and ferrous) polyphenol complex nanoparticles.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Chongbin Wang,Yongsheng Li,Hongchao Wang,Yiyu Wang,Xiaoyu Chen,Chengze Li,Mengfei Sun,Jianxin Chen
Nanofiltration membranes prepared via polyamide crosslinked Graphene oxide (GO) sheets have been considered to be promisingly applied in water purification. Unfortunately, the water flux of polyamide crosslinked GO-based membranes is strongly restricted due to the small interlamellar spacing of GO sheets. To solve this problem, the microporous polymer networks (MPNs) and GO sheets were introduced into the polyamide layer to reach a synergistic effect in this work. Specifically, the interlamellar interaction of GO sheets was manipulated via intercalating MPNs nanoparticles. The synergistic effect of GO and MPNs was significantly beneficial for the improvement of water flux. A delicate wrinkled membrane surface was formed via regulating the content of MPNs nanoparticles, which could provide larger area in contact with water molecules, further improved the water flux. The prepared membrane with 1 g/m 2 MPNs and 41.8 mg/m 2 GO sheets gave an evidently increased water flux from 6.6 L m −2 h −1 bar −1 to 25.1 L m −2 h −1 bar −1 compared with the GO-based membrane without MPNs. Additionally, a high Na 2 SO 4 retention of 94% and considerable efficiency in anti-fouling property were also observed for the prepared membranes.
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Sijie Gao,Shuozhen Hu,Guoming Luo,Shigang Sun,Xinsheng Zhang
Doping nitrogen (N) into the carbon support was widely applied to enhance the performance of Pd toward formic acid electro-oxidation (FAO). However, traditional nitrogen doping methods can only introduce a low content of nitrogen as well as a two-step complicated procedure to synthesize catalysts. In this study, a facile one-pot strategy is demonstrated to prepare N-doped carbon encapsulated palladium nanoparticles (Pd@N x C) via the pyrolysis of 2,2′-bipyridine palladium (II) complexes. A N-doped carbon layer with the thickness of about 4 nm is in-situ generated over Pd nanoparticles by only one pyrolysis procedure. Both XPS and in-situ XRD results suggest that metallic Pd is reduced from Pd 2+ by the complexed N in bipyridine during the pyrolysis at high temperature. The physical characterizations prove that the in-situ formation of N-doped carbon shell can not only effectively prevent the agglomeration or dissolution of Pd nanoparticles, but also promote the charge donation from the carbon layer to Pd, and maintain the structure of Pd atom complexed to two pyridinic-N atoms (Pd-N). This in-situ synthesis strategy can be successfully applied to carbon supports with different geometry, such as reduced graphene oxide and Vulcan XC-72. Pd@N 3 C/rGO, which contains the highest amount of N (7.39 at.%) and Pd-N (33.15%), shows the highest specific activity (5.88 mA cm −2 ) and excellent durability toward FAO.
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ANALYST
·
2022
·Vol. 147
·期 22
·5011-5017
·
IF 5.227
Jiaxi Yin,Hairong Cui,Ling Lei,Kangbing Wu
Graphene nanosheets (GS) were prepared by ultrasonic exfoliation of bulk graphite in N-methyl-2-pyrrolidone with the assistance of sodium pyrophosphate. The obtained GS suspension was modified on a glassy carbon electrode (GS/GCE), and then functionalized at different voltages (e.g. 1.0, 1.4 and 1.6 V) for 2 min in pH 7.0 phosphate buffer. The electrochemically functionalized GS/GCE (i.e. EGS/GCE) possesses more oxygen-containing groups and a higher defect level. More importantly, the active response area, electron transfer ability and interface adsorption capacity of the EGS/GCE enhanced remarkably. The possible mechanism of the performance enhancement is discussed, and the sensing application of the EGS/GCE in the detection of nitrofurazone (NFZ) is investigated. Compared with the GS/GCE, the EGS/GCE is much more active for NFZ oxidation and greatly increases the detection sensitivity. As a result, a highly sensitive electrochemical detection method has been developed for NFZ, with a detection limit of 2.1 nM. The practical application of the EGS/GCE was tested in fish meat samples, showing good accuracy and feasibility.
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JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Xuehan Xiao,Zongxue Yu,Ximei Zhu,Juan Wang,Qingcan Xiang
Microwave synthesis was taken to synthesis A-SEP@TiO 2 which has a steady chemical property. The A-SEP@TiO 2 composite materials and GO (with different proportion)were mixed and then pumped on commercial PVDF membranes to filter. Finally, the composite membrane A-SEP@TiO 2 /GO was obtained Under electrostatic self-assembly. Due to the superhydrophilicity and underwater super hydrophobicity of the surface of A-SEP@TiO 2 /GO membrane, A-SEP@TiO 2 /GO composite has shown great potential in the field of oil in water. The separation rates of four different emulsions (petroleum ether, toluene, Mesitylene, n-hexane) are all above 90%. With the steady chemical properties, A-SEP@TiO 2 /GO composite membrane is able to separate oil from water in harsh environment in long-run. After being immersed in 1 mol/L acid and alkali salt solution for one month respectively, all the sample membranes showed a better stability than commercial PVDF membranes. Also, the oil and water removal flux of A-SEP@TiO 2 /GO composite membrane only decreased by less than 10%, and that was why the composite membranecan can still maintain good cleaning performance even after ten times’ repetition of experiments,. Moreover, the membrane could efficiently remove dyes and heavy metal ions. Therefore, it has a great application prospect in complex water environment treatment.
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Membranes
·
2022
·Vol. 12
·期 10
·938
·
IF 4.562
Haoyu Wang,Zhiyun Han,Yanjuan Liu,Maojin Zheng,Zhenbang Liu,Wei Wang,Yingying Fan,Dongxue Han,Li Niu
Developing efficient and recyclable membranes for water contaminant removal still remains a challenge in terms of practical applications. Herein, a recyclable membrane constituted of polyacrylonitrile-graphene and oxide-polydopamine was fabricated and demonstrated efficient adsorption capacities with respect to heavy metal ions (62.9 mg g−1of Cu2+ion, CuSO450 mg L−1) and organic dye molecules (306.7 mg g−1of methylene blue and 339.6 mg g−1of eriochrome black T, MB/EBT 50 mg L−1). The polyacrylonitrile fibers provide the skeleton of the membrane, while the graphene oxide and polydopamine endow the membrane with hydrophilicity, which is favorable for the adsorption of pollutants in water. Benefitting from the protonation and deprotonation effects of graphene oxide and polydopamine, the obtained membrane demonstrated promotion of the selective adsorption or desorption of pollutant molecules. This guarantees that the adsorbed pollutant molecules can be desorbed promptly from the membrane through simple pH adjustment, ensuring the reusability of the membrane. After ten adsorption–desorption cycles, the membrane could still maintain a desirable adsorption capacity. In addition, compared with other, similar membranes reported, this composite membrane displays the highest mechanical stability. This work puts forward an alternative strategy for recyclable membrane design and expects to promote the utilization of membrane techniques in practical wastewater treatment.Keywords:wastewater treatment;pH-dependent;membrane
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 41
·19915-19926
·
IF 3.925
Xuhong Jiang,Mengmeng Sun,Zhuoyuan Chen
Clean and sustainable photoelectric technology has been developed rapidly in many fields. One of which is the novel marine corrosion protection technology that directly utilizes the abundant solar energy falling on the ocean to provide photoinduced cathodic protection for metallic structures, and has received increasing attention year by year. Improving the photoelectrochemical conversion and photoelectric cathodic protection performance for metals under sunlight is vital for achieving effective protection. In particular, optimizing the multi-dimensional nanostructured photoanode to accelerate the collection and transfer of photogenerated electrons and to improve the photoelectric and cathodic protection performance is a promising method. Here, an ultrafine branched anatase TiO2 nanolawn (NL) photoanode co-decorated with CdS nanoparticles and reduced graphene oxide quantum dots (rGO QDs) was prepared. Compared with single CdS modified TiO2 NL, the three-phase junction CdS/rGO QDs/TiO2 NL shows further enhanced photoelectrochemical conversion performance under simulated sunlight and visible light irradiation, increased by 66.7% and 83.3% compared to that of CdS/TiO2 NL, respectively. The rGO QDs, which acted as a high-efficiency electron transporter, are uniformly deposited on the TiO2 NL, and further promote the transport efficiency of photogenerated electrons. CdS as a visible-light responder is responsible for broadening the spectral response, and the ultrafine branched TiO2 NL substrate greatly expands the photon capture area and increases the electron collection sites. Finally, the synergy of the above three aspects ensures that the ternary CdS/rGO QDs/TiO2 NL photoanode exhibits further enhanced simulated sunlight-driven and visible light-driven photoelectric conversion efficiency and a photoinduced cathodic protection effect on 316L stainless steel and pure copper.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Lanlan Tian,Yuanlin Xie,Jing Lu,Tiefeng Liu,Qiang Hu,Yongneng Xiao,Xiaoquan Zhu,Xintai Su
Iron-nitride based materials are considered to be one of the most promising anode materials for Lithium-ion batteries (LIBs) due to their good electrical conductivity and high theoretical capacity. However, iron-based nitrides are easily deteriorated in the long-term lithiation/delithiation process, which reduces the electrochemical stability and limits their large-scale application. Here, we report a Fe 3 N or Fe 2 N reduced graphene oxide nanosheets (rGO) composite prepared through a facile annealing process under different atmosphere (NH 3 /Ar) from Fe 3 O 4 original material. The voids in cubic structure of Fe 3 N or Fe 2 N can be beneficial to buffer volume changes during lithiation/delithiation processes and provide active sites, and the rGO is helpful to improve electrical conductivity of composites. Moreover, the proportion of Fe 3 N in the composite is higher than that of Fe 2 N, indicating that more cubic structure can be released in Fe 3 N/rGO. Therefore, Fe 3 N/rGO showed a higher capacity (513 mA h g −1 after 200 cycles at a current density of 0.5 A g −1 ), better rate performance and more stable cycling performance. This work provides a new direction for the construction of iron-based nitrides with different valence states as anode active materials for LIBs using Fe 3 O 4 as raw material.
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