OPTICS EXPRESS
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2021
·Vol. 29
·期 21
·34552-34564
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IF 3.894
Zhiyuan Zhang,Zhaoxiang Li,Luyao Wang,Jinmeng Li,Jie Pan,Shuyun Wang,Chao Zhang,Zhen Li,Qianqian Peng,Xianwu Xiu
The composite substrate composed of precious metal, semiconductor and graphene has not only high sensitivity and uniform Raman signal but also stable chemical properties, which is one of the important topics in the field of surface-enhanced Raman scattering (SERS). In this paper, a sandwich SERS substrate based on tantalum oxide (Ta2O5) is designed and fabricated. The substrate has high sensitivity, stable performance and high quantification capability. The composite substrate can achieve a high sensitivity Raman detection of crystal violet (CV) with a detection limit of 10−11 M and an enhancement factor of 1.5 × 109. This is the result of the synergistic effect of electromagnetic enhancement and chemical enhancement, in which the chemical enhancement is the cooperative charge transfer in the system composed of probe molecules, silver nanoparticles (AgNPs) and Ta2O5, and the electromagnetic enhancement comes from the strong local surface plasmon resonance between the adjacent AgNPs. After exposing the composite substrate to the air for one month, the Raman signal did not weaken, indicating that the performance of the composite substrate is stable. In addition, there is an excellent linear relationship between the intensity of Raman characteristic peak and the concentration of probe molecules, which proves that the composite substrate has high quantification capability. In practical application, the composite SERS substrate can be used to detect harmful malachite green quickly and sensitively and has a broad application prospect in the field of food safety and chemical analysis.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
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2019
·
IF 3.073
Mei-Ling Liu,Jue Wang,Jia-Lin Guo,Tian-Dan Lu,Xue-Li Cao,Shi-Peng Sun
Purification and recovery of polar organic solvents such as dimethylformamide (DMF) with high chemical separation speed and low energy cost nanofiltration membranes has been widely investigated, while it is still a difficult challenge that high permeability of solvents and rejection of solutes are achieved simultaneously. In this study, a novel organic solvent nanofiltration (OSN) membranes was obtained via coating a thin selective graphene oxide (GO) layer on top of the polyimide porous substrate (PI) which was cross-linked to improve the stability in polar solvents. The resultant GO/cross-linked PI (GO/CLPI) composite membranes feature remarkable sieving capability of >94% for RBss molecules (1018 Da), accompanying high pure solvent permeability of 11.1 L h −1 m −2 bar −1 , 4.9 L h −1 m −2 bar −1 and 1.0 L h −1 m −2 bar −1 for water, IPA and DMF, respectively. Different from conventional method of characterization, low field nuclear magnetic resonance technology (LF-NMR) was utilized to confirm that the GO/CLPI membrane shows a higher adsorption capacity for IPA than DMF. This newly technique can be effectively utilized to evaluate the affinity between organic solvents and the surface of membranes.
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JOURNAL OF MATERIALS RESEARCH
·
2018
·Vol. 33
·期 10
·1506-1514
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IF 1.495
Yunchuan Qi,Ce Zhang,Shengtang Liu,Yanqing Zong,Yi Men
In this study, a facile room-temperature solution method is developed for the preparation of zinc oxide@graphene oxide (ZnO@GO) nanocomposites. Unlike the general process to obtain crystallized materials by heating, the room temperature we used can generate fine ZnO@GO nanocomposites with ultra-small ZnO nanocrystal (∼8 nm) and high weight content (∼84%). The obtained ZnO@GO nanocomposite was thoroughly characterized by various physicochemical techniques such as scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy, indicating well-dispersed ZnO on the GO layer and strong interaction between the each other. As an anode material for lithium-ion batteries, ZnO@GO exhibits high specific reversible capacity and excellent cycling performance, which can be ascribed to the role of GO in preventing the agglomeration of the ZnO nanoparticles by creating the decorated nanoscale composite during the electrochemical process.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 25
·期 6
·1535-1542
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IF 5.16
Hairan Zhang,Qiuyue Zhang,Ling Zhang,Tingting Pei,Erni Li,Huiting Wang,Qian Zhang,Lixin Xia
Graphical Making the switch : A thermally responsive poly( N -isopropylacrylamide)-modified graphene oxide (PNIPAm-GO) nanocomposite was synthesized by using a covalent “grafting-from” strategy. It was further applied as an intelligent PNIPAm-GO/GC electrode to display switchable electrocatalysis toward 1,4-dihydro-β-nicotinamide adenine dinucleotide and dopamine (see scheme). Poly( N -isopropylacrylamide)-modified graphene oxide (PNIPAm-GO), which is a type of thermally responsive GO, was designed and synthesized through a covalent “grafting-from” strategy. The as-prepared modified nanosheets integrated the individual advantages of two components, such as the thermal sensitivity of the PNIPAm terminal as well as the conductivity and the open 2D structure of the GO substrate. PNIPAm-GO was able to perform the reversible regulation of hydrophilicity/hydrophobicity in aqueous solution upon variations in the temperature. Such a unique property might also lead to the utilization of PNIPAm-GO as an intelligent electrode material to achieve a switchable electrochemical response toward a [Fe(CN) 6 ] 3−/4− probe. The PNIPAm-GO modified glassy carbon electrode (PNIPAm-GO/GC electrode) was able to exhibit better electrochemical performance in an ON/OFF switching effect than the PNIPAm-modified glassy carbon electrode (PNIPAm/GC electrode) without GO owing to the intrinsic properties and large surface area of the introduced GO. Moreover, it was found that the PNIPAm-GO/GC electrode also displayed excellent thermally responsive electrocatalysis toward the detection of 1,4-dihydro-β-nicotinamide adenine dinucleotide (NADH) and dopamine (DA), which resulted in two different catalytic statuses on the same electrode. This kind of switchable catalytic performance of the PNIPAm-GO/GC electrode might greatly enhance the flexibility of its application, and thus it is expected to have wide potential for applications in the fields of biosensors and biocatalysis.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 5
·3505-3510
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IF 1.354
Guo Jian,Wang Yu,Liu Dan-Dan,Wan Rong,Han Guo-Zhi
We report a simple and green approach to synthesize stable water-dispersible silver nanoparticles decorated by magnetic Fe3O4 and graphene oxide (GO). These results of UV-Vis spectra, along with TEM and SEM indicated that the water-dispersible silver nanoparticles
had cluster flat structure and retained the optical properties of the original silver particle. Combining the advantages of Fe3O4 and GO, the composite nanoparticles showed enhanced catalytic activity with good recycling utilization rate by magnetic separation.
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MATERIALS LETTERS
·
2015
·
IF 2.489
Ling Li,Ya Q. Wu,Ke K. Sun,Run Zhang,Lu Fan,Ke K. Liang,Le B. Mao
By exploring the layer-by-layer self-assembly method and the changes of content of graphene oxide (GO), controllable preparation of a new core–shell microsphere Fe 3 O 4 @MOFs/GO was achieved in this work. The prepared composite material was characterized by the XRD , FTIR, and TEM analysis. The application of Fe 3 O 4 @MOFs/GO as drug carrier for ibuprofen was studied. The results suggested that the properties of drug loading and release can be tuned by different layers and content of GO.
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Science China-Chemistry
·
2015
·Vol. 58
·期 7
·1131-1136
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IF 1.695
Cheng Zhenqian,Ding Ding,Nie Xiangkun,Xu Yiting,Song Zhiling,Fu Ting,Chen Zhuo,Tan Weihong
In this work, we fabricate an efficient and stable photocatalyst system which has superior recyclability even under concentrated acidic conditions. The photocatalyst is prepared by assembling magnetic graphitic nanocapsules, titania (TiO 2 ) and graphene oxide (GO) into a complex system through π-π stacking and electrostatic interactions. Such catalytic complex demonstrates very high stability. Even after dispersal into a concentrated acidic solution for one month, this photocatalyst could still be recycled and maintain its catalytic activity. With methyl orange as the model molecule, the photocatalyst was demonstrated to rapidly decompose the molecules with very high photocatalytic activity under both concentrated acidic and neutral condition. Moreover, this photocatalyst retains approximately 100 wt% of its original photocatalytic activity even after multiple experimental runs, of magnetic recycling. Finally, using different samples from natural water sources and different dyes, this GO/magnetic graphitic nanocapsule/TiO 2 system also demonstrates its high efficiency and recyclability for practical application.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Shan Huang,Zhichun Si,Xuankun Li,Jinshuo Zou,Youwei Yao,Duan Weng
Au nanoparticles and reduced graphene oxide (r-GO) co-modified TiO 2 nanotube arrays (TNTs) were prepared by a facile and green strategy based on the electro-deposition technology for detecting H 2 O 2 , O 2 and nitrite. As-prepared Au/r-GO/TNTs electrode was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The results clearly demonstrate that the successful attachment of r-GO sheets and narrow-range distribution of Au nanoparticles on TNTs . The reduced grapheme oxide sheet can help to improve the electronic conductive performance of TNTs and prevent the agglomeration of Au nanoparticles. Electrochemical studies reveal that the Au/r-GO/TNTs electrode exhibit excellent electrocatalytic performance toward the reduction of H 2 O 2 . Under the optimal experimental condition, the sensor has a quick response to H 2 O 2 at −0.3 V with a high sensitivity (1011.35 mA M −1 cm −2 ), wide linear range (0.01–22.3 mM) and low detection limit (0.006 μM). In addition, the sensor also has good stability and excellent selectivity. Moreover, the established Au/r-GO/TNTs electrode also shows high sensitivities towards dissolved O 2 and nitrite ions, which has great potential for the development of electrochemical sensors, molecular bioelectronics devices and biosensors.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Haofan Wen,Yunfa Si,Zibo Chen,Yitong Xin,Shaowen Cao,Cheng Chen,Haoran Zu,Daping He
MXenes are emerging materials renowned for their exceptional conductivity, abundant functional groups, and excellent solution processability, making them highly promising as conductive-additive-free inks for flexible electronic devices. However, current preparation methods are hampered by low yields of MXene flakes so that substantial waste MXene sediments (MS) are generated. Here, we demonstrate a type of conductive ink with appropriate rheological properties, namely MG inks formulated using MS and graphene oxide (GO), for screen-printing frequency selective surface (FSS). GO facilitates interlayer interactions by covalently cross-linking with MXene flakes, resulting in a denser structure and significantly enhancing the conductivity of the best-performing MG-based ink to 849 S cm–1. Additionally, GO serves as a binder to considerably improve the rheological properties of MS, thus enabling high-quality printing on various substrates. The close stacking of MS and GO not only improves the oxidation resistance but also maintains conductivity above 97% even after 60 days. Furthermore, the MG-based FSS produced via straightforward screen printing demonstrates excellent performance and retains its functionality after 90 days of operation. This MS-based ink formulation represents a strategy of “turning trash into treasure” and highlights the potential of MS for the next generation of electronic devices.
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 6
·4432-4442
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IF 3.201
Dongshu Sun,Minjia Meng,Yao Lu,Bo Hu,Yongsheng Yan,Chunxiang Li
An hybrid membranes based on functional GO nanosheet for selective adsorption lithium from compound was great potential. Here, a simple and efficient methodology was reported to obtain high stability, selectivity, and antifouling properties. More importantly, we studied the selective adsorption capacity of the fabricated membranes to lithium under a high magnesium and low lithium environment. The results showed that the fabricated membrane exhibited excellent lithium adsorption and highly selective adsorption efficiency. The fabricated membranes presented a relatively lower contact angle (67.226°) and a higher membrane flux (13.62 mL cm−2 min−1), which indicated that the fabricated membrane had a high hydrophilicity because the presence of carboxylic and hydroxyl groups of GO could enhance the interaction between the membrane and water. Moreover, the perm-selectivity results (β values were greater than 7) and regeneration ability (90.9% of the maximum adsorption capacity was retained after 10 cycles) were shown. The overall results suggested that functional GO can be considered as an effective additive for inorganic–organic composite membranes for the selective adsorption of lithium. It is worth mentioning that this methodology can be applied to selectively identify and adsorb lithium and is environmentally friendly, as it does not lead to secondary pollution.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Huanliang Liu,Wenqing Lai,Yue Shi,Lei Tian,Kang Li,Liping Bian,Zhuge Xi,Bencheng Lin
Bacteria in air harm the human body. Therefore, developing novel materials capable of simultaneously filtering and terminating bacteria is highly desirable. However, the filtration and inhibition performance of existing filters remain far from optimal. In this study, we combine the electrospinning technique with an in situ reduction approach to fabricate electrospun composite fibrous membranes for simultaneous bacterial filtration and termination. The results show that composite membranes with a homogenously fibrous morphology are successfully prepared. Furthermore, the dual antibacterial agents silver nanoparticles (Ag) and graphene oxide nanosheets (GO) are uniformly encapsulated within the fibers. The tensile strength and elastic modulus of the electrospun composite membranes reach 1.04 and 10.23 MPa, respectively. In addition, the results show that the composite membranes exhibit excellent interception efficiency of over 99.9 % against the gram-positive bacteria S. aureus . The electrospun composite membranes also exhibit high antibacterial activity against E. coli , S. aureus , K. pneumoniae , C. albicans , and B. subtilis, achieving antibacterial efficiency of over 99.99 %. Electrospun composite membranes with bacterial filtration and termination properties may have great potential for use in personal protective equipment and indoor and outdoor air purification.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Kexin Tao,Yuning Zhang,Yu Song,Zhiyuan Chen,Yao Wang,Yanxin Wang,Jianguo Tang,Linjun Huang
Water pollution has long been a significant issue, and the purification of dye wastewater plays a crucial role in addressing this problem. Graphene oxide (GO) has found extensive applications in water treatment due to its unique two-dimensional (2D) structure and a surface rich in a large number of oxygen-containing functional groups. We introduced silica(SiO 2 ) and polyethyleneimine(PEI) into GO to prepare a membrane. The experimental findings revealed that the 3-SiO 2 /GO binary composite membrane achieved a high water permeability of 45.6 L m −2 h −1 bar −1 while maintaining retention, which is nearly four times higher than that of the GO membrane (9.85 L m −2 h −1 bar −1 ).The water permeability of the PEI 0.2 -SiO 2 /GO ternary composite membrane achieved 42.37 L m −2 h −1 bar −1 . The rejection rate for methyl orange dye reached 92.36 %, with similar rejection rates all above 95 % observed for other dyes.
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