JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2019
·Vol. 94
·期 11
·3530-3537
·
IF 2.659
Fei Jiang,Jixiang Zhang,Nian Li,Cui Liu,Yongqiang Zhou,Xinling Yu,Lidong Sun,Yanping Song,Shudong Zhang,Zhenyang Wang
BACKGROUND Nitrogen doping significantly improves the electrochemical properties of graphene. Here, a new and effective methodology of preparing nitrogen-doped graphene (NG) by thermal annealing of fluorinated graphene oxide (FGO) under the atmosphere of ammonia, is reported, in which ammonia is the reductant for FGO reduction and also the nitrogen source for nitrogen doping. This method can achieve higher nitrogen doping content than conventional approaches. RESULTS FGO prepared from fluorinated graphite polymer (CF) is directly used as a precursor to synthesize NG. Four samples with the same reaction time and different annealing temperatures are compared, and the highest nitrogen content of the NG reaches 12.45 at% at the reaction condition of 800 °C and 3 h. The synthesized NG samples are examined as a supercapacitor electrode material, displaying excellent performance due to the high nitrogen doping and a large number of active sites. CONCLUSION With the increase of annealing temperature, the nitrogen content of different NG samples first increases and then decreases. The specific capacitance of NG electrode material also shows the same trend as the nitrogen content. The highest specific capacitance in three-electrode configuration attains 225.2 F g −1 at a current density of 1 A g −1 . The electrode maintains a 90% capacitance after 5000 cycles, showing good cycle stability. This synthetic method provides a new approach for the preparation of NG with high nitrogen doping as supercapacitor electrode materials. © 2019 Society of Chemical Industry
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Yang Song,Ronghui Dan,Lei Li,Xiaojuan Xia,Jiang Zhao,Rongqing Xu
The potential of ubiquitous humidity monitoring is unlocked through the presentation of a novel, highly flexible sensor, which is fabricated using a dramatically simplified and cost-effective method, challenging existing complex manufacturing approaches. Specifically, this study utilizes a laser direct writing technique that is both efficient and rapid for the fabrication of flexible laser-induced graphene (LIG) interdigitated electrodes (IDEs). By skillfully integrating graphene oxide (GO) and poly (3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT: PSS), a flexible GO/PEDOT: PSS@LIG humidity sensor has been successfully developed. This sensor cleverly harnesses the distinctive properties of both PEDOT: PSS and GO, giving rise to a noteworthy synergistic effect that greatly boosts the humidity sensing capabilities of the GO/PEDOT: PSS composite. The sensor demonstrates a capacitive sensitivity of 1493561.67 μF/% RH spanning from 11 % to 97 % RH. Furthermore, it exhibits exceptional response and recovery times (5 and 16.5 s, respectively), along with commendable stability. These features guarantee efficient and precise real-time monitoring. Such remarkable sensing attributes position the flexible GO/PEDOT: PSS@LIG humidity sensor as a highly promising candidate for deployment in non-contact sensing domains, including environmental and respiratory monitoring.
研究领域:
材料科学
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传感器技术
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环境监测
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2017
·
IF 6.337
Yan Zhao,Xiaolong Wu,Shan Sun,Liling Ma,Ling Zhang,Hengwei Lin
A facile and high-efficient approach for the preparation of graphene quantum dots (GQDs) is reported. With the assistance of KO 2 in the hydrothermal cutting graphene oxide (GO), a conversion rate of ∼35 wt% from GO to GQDs is achieved. The as-prepared GQDs display rarely observed yellow emissive photoluminescence with a respectable quantum yield of 8.9% in H 2 O. Moreover, the GQDs are further demonstrated to perform as a potential pH probe and bioimaging agent.
研究领域:
材料科学
·
化学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2018
·
IF 1.1
Xiaojun Tao,Shuang Wang,Yanbao Zhao,Zhiwei Li
In this paper, a facile one-pot bottom-up approach for the preparation of graphene and Ni/graphene nanostructures at normal pressure and low temperature (150 ∘ C) has been developed. The graphene and Ni/graphene nanostructures were prepared by reducing hexachloro-benzene (C 6 Cl 6 ) with potassium in n -tetradecane (C 1 4 H 3 0 ) solution without the presence of a catalyst. Meanwhile, the effect of Ni content on the specific surface area (SSA) of the final products was investigated. The testing results display that the as-prepared samples have large SSA and high C/O ratio, implying that the designed synthesis method is simple and efficient. To evaluate the adsorption performances of the samples, we select organic dye rhodamine B (RhB) as the model organic contaminant in aqueous solutions. The experimental results show that the samples possess high adsorption capacity ( q max mg g − 1 ) , ultrafast adsorption rate ( > 9 9 %, 2 min), high adsorption efficiency ( ≥ 9 9 . 8 %) and good chemical stability in a wide pH range (2–11), high salt tolerance ( > 8 0 mg mL − 1 ) , and good reusability ( > 9 9 . 5 %, 9 cycles) for dye RhB from water. In particular, the samples exhibit a good property for the treatment of the raw industrial wastewater (RIW).
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Science of Advanced Materials
·
2015
·Vol. 7
·期 6
·1213-1220
·
IF 2.598
Yu Chenggong,Zhu Ting,Zhang Xingxiang,Liu Haihui
Graphene films with different lateral sizes and poly(vinylbutyral) (PVB)/graphene composites were fabricated. The morphological structural and mechanical properties were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform
infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), four-probe conductivity measurements and tensile strength testing (TST). The results show that, graphene oxide (GO) and reduced graphene oxide (RGO) with different lateral sizes were fabricated
successfully. As the lateral size of the GO decreased, the tensile strength and modulus of GO films was improved; however, the tensile modulus of the film fabricated with nanoscale GO film decreased. RGO samples with a large area and those that are nanosized exhibited high electrical conductivities
of 867 S/m and 927 S/m, respectively. The tensile strength and modulus of the PVB/GO and PVB/RGO composites increased at low filler contents, exhibiting a maximum at 0.1 wt%. The tensile strength increased by 31% and 29%, and the tensile modulus increased by 20% and 24%, respectively, for
the composites fabricated with the smallest GO and RGO. In contrast, the elongation at break of the PVB/graphene composite materials decreased.
研究领域:
材料科学
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纳米技术
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复合材料
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机械工程
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电气工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Qianyu Xu,Xiaoyu Lin,Li Gan,Gary Owens,Zuliang Chen
While chemical methods are often used to convert graphene oxide (GO) to reduced graphene oxide (RGO), chemical reduction is often environmentally unfriendly due to the high toxicity of many chemical reducing agents. To address this limitation, Bacillus sphaericus was used here for the green reduction of GO to RGO. Successful reduction was confirmed by various advanced characterization techniques including Ultraviolet–Visible (UV–vis), X-ray Powder Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscope and Energy Dispersive Spectrometer (SEM-EDS). With a new peak attributable to RGO at 261 nm appearing in UV–vis and XRD spectra of the reduced product also developed a new peak at 2θ = 24.6° characteristic of RGO. Successful reduction was also supported by Raman spectroscopy which showed that the ratio of the intensity band (D band: G band) increased from 0.99 to 1.17. FTIR and XPS both confirmed that specific O H (3399 cm −1 ), C O (1734 cm −1 ) and C O C (287 eV) bonds were reduced. Cyclic voltammograms (CVs) showed that the produced RGO exhibited good conductivity (changed from 0.8 to 1.1 mW·cm −2 ). This work developed a green and easy operated method of synthesizing RGO using microorganisms.
研究领域:
材料科学
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环境科学
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微生物学
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Yang Zhou,Chunhai Li,Hong Wu,Shaoyun Guo
Microencapsulated phase change materials (MePCMs) are widely used for thermal energy storage. How to increase the thermal conductivity of MePCMs and maintain the maximum simultaneously is a common concern. In this work, MePCMs were prepared by encapsulating paraffin with graphene oxide (GO) in an aqueous solution through self-assembly and the hybrid shell is constructed through the π-π interaction between GO and graphene nanoplates (GNP). The result showed that ultra-thin layer structure of nano-sized GO and GNP can decrease the mass proportion of shell and improve the encapsulation rate effectively. Compare with GO shell, the hybrid shell can further enhance the thermal conductivity of MePCMs from 0.67 W/ mK to 0.90 W/ mK, while the energy storage capacity is almost the same as that of paraffin. This work proposed a simple and effective method to prepare the MePCMs with high thermal conductivity for thermal energy storage.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 15
·11739-11748
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IF 4.6
Yanbo Peng,Yuhong Zhao,Ying Yuan,Wei Meng,Wenhe Jiang,Xiluan Wang
Most current commercial humidity sensors rely on precious metals and chemicals. In this study, alkali lignin produced in the paper industry was utilized to form a film with hydroxyethyl cellulose to generate laser-induced graphene (LIG) as an electrode material for a sensor by the laser-induction technique. LIG exhibits excellent conductivity, and the experimental results demonstrate that its resistivity can be adjusted by laser power without the necessity for additional conductive materials. A solution comprising a blend of graphene oxide and sodium lignosulfonate was introduced to the LIG surface in a dropwise manner, thereby establishing a sensing surface. This process resulted in the introduction of hydrophilic groups, including carboxyl, phenolic hydroxyl, and sulfonic acid. The integration of these hydrophilic groups enhanced the surface's sensitivity to humidity, thereby facilitating the precise capture of alterations in ambient air humidity. The humidity sensor, which employs alkali lignin and lignin laser-induced graphene as electrodes and graphene oxide (GO) as the humidity-sensitive layer, exhibits an exceptionally high degree of sensitivity to humidity. The response reached 42.74 (RRH/R0) at 80% relative humidity and 133.96 (RRH/R0) at 90% humidity with a sensitivity of 147.73%/% RH. Moreover, the sensor displays an impressively brief recovery period, which remains unaltered even after multiple cycles. Additionally, the humidity sensor exhibits excellent stability for a period of up to 30 days. This study has successfully developed a simple and efficient method for preparing graphene, and has produced a flexible resistive sensor with high sensitivity, repeatability, and stability, thereby opening up new avenues for the high-value utilisation of lignin.
研究领域:
材料科学
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传感技术
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环境健康
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
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2024
·
IF 8.3
Ruixue Meng,Xinxin Wang,Deping Li,Kewei Zhang,Xiankai Li,Yanhui Li,Long Chen,Lijie Ci
Effective organic dyes selective separation from high salinity textile wastewater consisting of inorganic salts and organic dyes is of great significant for the textile wastewater treatment . Graphene oxide (GO) have been used widely to form ultrathin high-permeance membrane for molecular and ionic sieving. However, swelling and membrane fouling of GO membrane hampered its practical applications. In this work, high stability and antifouling reduced graphene oxide (rGO) membranes were prepared, and Fe 2 O 3 nanoparticles was used as intercalation to turn the membrane interlayer spacing. The rGO/2Fe 2 O 3 nanocomposite blended membrane exhibited high permeance of 24.90 L m −2 h −1 bar −1 , excellent organic dyes rejection (98.15 % and 98.69 % for methylene blue and Evans blue, respectively) and low salt retention (6.26 % for NaCl). Meanwhile, this membrane demonstrated a superior selective dye/salt separation factor up to 232 with a high rejection of 99.59 % to Evans blue and a lower salt rejection of 5.03 % to NaCl. Furthermore, nanofiltration experiments towards Evans blue/NaCl mixed solution indicated that the membrane also exhibited excellent antifouling performance with flux recovery rate of >86 % after six fouling/backwash cycles. Therefore, our work may provide a promising idea for the development of two-dimensional nanofiltration membranes for efficient high salinity textile wastewater treatment.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2024
·Vol. 26
·期 13
·2400411
·
IF 3.4
Li Chen,Hang Zhu,Dai Shi,Jianxiang Lv,Xingkai Zhang,Changning Bai
Excellent antiwear performance, high bearing capacity, and long service life are essential prerequisites for the reliability and durability of Si-based micro/nanodevice operation. To improve the antiwear property and prolong service life of Si-based micro-/nanodevices under high loads, graphene oxide (GO) nanosheets, graphene quantum dots (GQDs), and ionic liquid-capped GQDs (IL-GQDs) are used to create three kinds of multilayer films as solid lubricants, that is, single-component (GO) 5 , (GO/GQDs) 5 , and (GO/IL-GQDs) 5 multilayer films. The results show that (GO/IL-GQDs) 5 composite multilayer possesses excellent wear resistance under a high load of 4 N with the wear rate of 4.9 × 10 −7 mm 3 N −1 m −1 . The superior antiwear performance of (GO/IL-GQDs) 5 composite film is mainly due to the unique 3D structure composed of GO nanosheets alternating with IL-GQDs. The rigid GO nanosheets play a role in load-carrying capacity, and the IL-GQDs could delay the time of structure transformation and reduce the loss rate of transfer film, thereby effectively extending the service life of (GO/IL-GQDs) 5 composite multilayer. Such multilayers are expected to be good solid lubricating films suitable for Si-based micro-/nanodevices.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Shaolin Yang,Simiao Sha,Hui Lu,Jiandong Wu,Jinfu Ma,Dewei Wang,Chunping Hou,Zhilin Sheng
Fabrication of filtration membranes with opposite wettability for the separation of immiscible oil/water mixture has aroused extensive attention owing to the avoidance of oil/water density relationship limitation. Herein, we demonstrate a low-cost, mild and environment-friendly method to prepare underwater superoleophobic graphene oxide (GO) coated fabric through dip-coating of GO nanosheets onto cotton fabric, and the superhydrophilic GO coated fabric can be converted to superhydrophobic reduced graphene oxide (rGO) coated fabric after chemical reduction of the coated GO. The GO and rGO coated fabrics show excellent efficiencies for unidirectional separation of various light oils and heavy oils from water, respectively. Both types of fabrics could maintain their original wettability in harsh environments, and demonstrate high efficiency and recyclability for the separation of oil/water mixtures containing hot water, acid and salt. Furthermore, a T-shaped bidirectional separation device was devised by integrating the two fabrics with opposite wettability, which can realize high-efficient continuous separation of various oil/water mixtures regardless of the oil density.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-7
·
IF 5.228
Yu Huitao,Zhang Bangwen,Bulin Chaoke,Li Ruihong,Xing Ruiguang
As an important precursor and derivate of graphene, graphene oxide (GO) has received wide attention in recent years. However, the synthesis of GO in an economical and efficient way remains a great challenge. Here we reported an improved NaNO 3 -free Hummers method by partly replacing KMnO 4 with K 2 FeO 4 and controlling the amount of concentrated sulfuric acid. As compared to the existing NaNO 3 -free Hummers methods, this improved routine greatly reduces the reactant consumption while keeps a high yield. The obtained GO was characterized by various techniques, and its derived graphene aerogel was demonstrated as high-performance supercapacitor electrodes. This improved synthesis shows good prospects for scalable production and applications of GO and its derivatives.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）