COMPOSITES PART B-ENGINEERING
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2019
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IF 6.864
Haijun Liu,Hanyang Gao,Guoxin Hu
Uniform dispersion of pristine graphene in polymers has always been a difficulty in the research and industry. In this paper, a simple but effective method was used to uniformly disperse the pristine graphene in NR matrix to prepare an NR/pristine graphene composite. The conductivity of this composite with 5 wt% graphene loading fraction was ∼0.005 S/m, around 4 orders of magnitude higher than that prepared by other methods with a similar loading fraction. The gauge factor (GF) of the strain sensor using the as-prepared composite as the component could be as high as 46, taking a lead positon in the reported strain sensors. Owing to the high sensibility, the sensor was suitable to be used for the detection of very subtle motions such as breathing or heartbeat. In a wrist-pulse testing, premature beats, less forceful heartbeats, and the “P”“T”“D″ waves of the heartbeats could be precisely monitored and distinguished. Swallowing and vocalization could also be efficiently detected by attaching the sensor on the subject's throat.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2015
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IF 4.504
Shaopeng Qi,Bo Zhao,Heqing Tang,Xiaoqing Jiang
In this article, a novel electrochemical sensor based on pristine graphene (PG) is successfully constructed to detect ascorbic acid (AA), dopamine (DA), and uric acid (UA). The PG is obtained by liquid-phase exfoliation of graphite and characterized by transmission electron microscopy and X-ray photoelectron spectroscopy. The sensor based on PG prepared by this method to realize simultaneous determination of AA, DA, and UA is firstly reported. The linear detection ranges for AA, DA, and UA are 9.00–2314 μM, 5.00–710 μM, and 6.00–1330 μM, respectively, with detection limits of 6.45, 2.00, and 4.82 μM. This PG based sensor exhibits excellent performance for detection of AA, DA, and UA, which is much better than those electrochemical sensors based on chemical converted graphene.
研究领域:
分析化学
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生物医学工程
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2017
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IF 1.815
Shaopeng Qi,Bo Zhao,Bo Zhou,Xiaoqing Jiang
A new electrochemical immunosensor for fast determination of ractopamine (RAC) is fabricated based on pristine graphene (PG). The PG provides a microenvironment beneficial the immobilization of RAC, promotes the electron transfer, and raises the sensitivity of the immunosensor. The free RAC in solution can be effectively measured based on the competitive immunoreaction between RAC-antibody and RAC. The calibration graph shows linearity over the concentration ranges of 0.1–10 and 10–4000 ng mL −1 . The proposed immunosensor displays a satisfactory stability, selectivity, and reproducibility and has been applied to the quantificational detection of RAC in real pork samples.
研究领域:
分析化学
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食品安全检测
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产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2014
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IF 3.633
Konghua Liu,Shilong Chen,Yuanfang Luo,Demin Jia,Hong Gao,Guojun Hu,Lan Liu
The combination of metal nanostructures and pristine graphene with high quality is highly expected for many applications. A method for the large-scale production of metal nanoparticle (NP)/pristine graphene hybrid and its conductive polymer composites is presented, by a combinatorial process of noncovalent functionalization of defect-free pristine-graphene with Poly(amidoamine) (PAMAM) dendrimer and the homogenous attachment of metal NPs on graphene surface. Stable PAMAM functionalized graphene nanofluid is achieved when there is the absence of solvents. The graphene sheets in the hybrid preserve the intrinsic structure and homogenous dispersion. Silver NP (AgNP) decorated graphene hybrid with homogenous dispersion is realized by using PAMAM as stabilizing and also reducing agents through thermal reduction method. The hybrid is used as nanoscale filler to generate epoxy-based conductive composites for electrical interconnects due to the combined effects of the excellent electrical conductivity of high-quality pristine-graphene at low percolation threshold and enhanced contacts between the fillers by low temperature sintering of AgNPs. This method could lead to the large-scale production of graphene-based composites for a wide range of applications.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2019
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IF 6.282
Yang Zhan,Chuanxi Xiong,Junwei Yang,Zhuqun Shi,Quanling Yang
Cellulose nanofibrils extracted from wood are natural polymer nanomaterials with high specific surface area, low density, high strength , and high elastic modulus . However, they are insulating materials and cannot be directly used in the electronic devices. Herein, pristine graphene (PG) exfoliated by triethanolamine was used to composite with TEMPO-oxidized cellulose nanofibril (TOCN) to prepare the conductive nanocomposite films in aqueous system. As a reference, the graphene oxide (GO) and reduced graphene oxide (RGO) were also composited with TOCN to prepared the TOCN−GO and TOCN−RGO composite films . The maximum electrical conductivity of the TOCN−PG film was 568 S/cm with 20 wt% PG, achieving great enhancement than the TOCN film with insulation. It was also much higher than the TOCN−GO films (3.44 × 10 −11 S/cm) and about 185 times more than TOCN−RGO composite films (3.06 S/cm). Moreover, the TOCN−PG composites containing 10 wt% PG exhibited excellent tensile strength , elastic modulus and the elongation at break of 389 MPa, 8.0 GPa and about 20%, respectively, much higher than those of the neat TOCN film.
研究领域:
材料科学
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纳米技术
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电子工程
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2015
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IF 4.097
Yong Liu,Rui Wang,Yuhan Zhu,Ruizhen Li,Jingdong Zhang
A photoelectrochemical (PEC) sensing platform was designed for catechol determination using CdS quantum dots (QDs), DNA and pristine graphene (PGR) nanocomposite film-modified electrode. In such a composite film-based PEC sensor, CdS QDs served as the photoelectric conversion element which produced photocurrent signal under visible light illumination; and DNA was designed as the biological recognition element which improved the PEC response of sensor toward catechol due to the interaction between DNA and catechol. To improve the electron transfer of the composite film, PGR with high electrical conductivity was doped, which significantly amplified the photocurrent signal of sensor. Based on such a CdS-DNA-PGR composite film-modified electrode, catechol showed a linear PEC response proportional to its concentration from 1.0 × 10 −8 to 1.0 × 10 −6 mol L −1 . The detection limit (3S/N) was estimated to be 4.9 × 10 −9 mol L −1 . The developed PEC sensor was successfully applied to determine trace catechol in water samples.
研究领域:
分析化学
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环境科学
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生物传感技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2014
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IF 4.058
Wencheng Du,Shaopeng Qi,Yinyan Zhu,Peipei Sun,Lihua Zhu,Xiaoqing Jiang
High-quality concentrated pristine graphene (PG) dispersions were conveniently prepared by an organic salt-assisted exfoliation method. Applications of this PG product can be directly done with these stable surfactant-free graphene dispersions. Transparent graphene thin films made by drop-casting PG dispersions on glass slide and dried at 70 °C in air and further treated by thermal annealing in Nitrogen atmosphere exhibited very low sheet resistance (124 Ω/□) and high conductivity up to ca. 50,000 S/m. The potential utility of this massively and easily obtained PG was further demonstrated by using them as excellent conductive substrate supporting palladium nanoparticles for electro-oxidation of alcohol in NaOH solution.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
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2015
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IF 2.371
Yuanpeng Leng,Yahui Gao,Wucong Wang,Yaping Zhao
A continuous supercritical solvothermal technique was developed for synthesizing TiO 2 –graphene hybrids, with the pristine graphene sheets used as the crystallization sites and the TiO 2 nanoparticles crystallized on the graphene, forming the hybrids simultaneously. The structure and morphology of the fabricated hybrids were characterized via X-ray diffraction, transmission electron microscopy and high resolution transmission electron microscopy. The uniform hybrids were obtained at different concentrations of graphene while the temperature, pressure and resident time were fixed at 350 °C, 23 MPa, and 30 s, respectively. The TiO 2 particles formed on the hybrids were approximately 5–10 nm in size and dispersed uniformly. Compared with the pure TiO 2 and the commercial P25, the photocatalytic efficiency of the hybrids was greatly enhanced. The hybrid enabled methyl orange dye to degrade almost completely in 180 min, while only 78% and 82% of the methyl orange dye was degraded separately by the pure TiO 2 and P25. This enhanced photocatalytic performance of the hybrids is attributed to the well distributed-TiO 2 and the rapid transfer of the photo-generated electrons from the surface of the catalyst to the graphene, thereby preventing a photo-generated electron–hole recombination.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CARBON
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2015
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IF 6.196
Jianping Chen,Weili Shi,Dong Fang,Tao Wang,Jing Huang,Qi Li,Ming Jiang,Lei Liu,Qiong Li,Lijie Dong,Qing Wang,Chuanxi Xiong
Up to now, the cost-effective mass production of pristine graphene sheets remains a significant challenge. We report a binary solvent system of dimethylformamide and n -butylalcohol that facilitates the high concentration production of unoxidized graphene through liquid-exfoliation assisted with sonication . A stable dispersion with concentration as high as 6.5 mg/ml, was received via this method. The conductivity of a film made from the graphene sheets had a conductivity of 27,000 S/m. The supercapacitor fabricated by graphene exhibits a giant capacitance of 600 F/g and an outstanding long-term stability.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
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2022
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IF 3.806
Yaqi Wang,Junwei Yang,Yiheng Song,Quanling Yang,Chuanxi Xiong,Zhuqun Shi
Bio-based materials with good electrical properties produced by environmentally friendly methods have been increasingly applied in battery and supercapacitor technologies. In this work, we used 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibers (TOCN) and pristine graphene (PG) as precursors to fabricate three-dimensional (3D) carbon aerogels with outstanding conductivity via freeze-drying followed by carbonization . The specific capacitance of the carbonized TOCN/PG (CTG) aerogels reached 134.09 F/g at a current density of 0.5 A/g. Meanwhile, a better cycling stability was achieved and the capacitance retained 98.89 % after 5000 cycles. As the temperature increased to 1100 °C, the electrochemical performance of the carbonized TOCN aerogel (CTOCN-1100) electrode was improved significantly with a specific capacitance of 361.74 F/g at a current density of 0.5 A/g, and the capacitance still retained as high as 99.3 % after 5000 cycles. Therefore, these bio-based cellulose nanofibrils are promising in the field of supercapacitors.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Lin Li,Kunpeng Yu,Dayu Liang,Jianzhong Yin
GNs were prepared by scCO 2 circulating jet cavitation. • Pristine GN was used to construct tubular α-Al 2 O 3 membranes. • MoS 2 hybridization widens and stabilizes graphene laminar channels. • The G 8 M 2 membrane exhibits outstanding dye/NaCl separation performance. Pristine graphene nanosheets provide a low-functional-group scaffold for laminar nanofiltration membranes, but compact, poorly wetted pathways limit water transport. Here, pristine graphene nanosheets were produced by a circulating supercritical CO 2 (scCO 2 ) jet-cavitation process and deposited on porous α-Al 2 O 3 tubular supports. MoS 2 nanosheets were incorporated as hydrophilic, locally distributed two-dimensional channel-regulating components, forming heterogeneous GN/MoS 2 lamellar pathways that increased water permeance while maintaining dye selectivity. A PEI@GA-crosslinked surface layer supplied positive charge. The optimized G 8 M 2 membrane rejected more than 99% of CBB, CR, and BY, with water permeances of 110.24–131.04 L·m −2 ·h −1 ·bar −1 . In dye/NaCl feeds, it achieved a permeance of 139.16 L·m −2 ·h −1 ·bar −1 and separation factor of 866.87 for CR/NaCl, with a flux recovery ratio above 97% during the tested CR fouling cycles. During the 120 h CR/NaCl separation stability test with periodic hydraulic rinsing every 12 h, the membrane delivered an average permeance of 124.46 L·m −2 ·h −1 ·bar −1 and an average CR rejection of 99.60%, while maintaining low NaCl rejection. This work integrates nonoxidative graphene exfoliation, tubular membrane construction, and heterogeneous two-dimensional channel regulation for dye/salt fractionation. Download: Download high-res image (75KB) Download: Download full-size image
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Bingjie Hou,Huaizhi Liu,Shaopeng Qi,Yinyan Zhu,Bo Zhou,Xiaoqing Jiang,Lihua Zhu
High quality pristine graphene (PG) dispersions are prepared conveniently via an organic salts assisted exfoliation method in a green, non-toxic, cheap and low boiling point solvent: ethanol. The PG is characterized by transmission electron microscopy and atomic force microscopy. Furthermore, the PG is used as an electrode material for fabrication of nonenzymatic sensor of hydrogen peroxide (H 2 O 2 ). This nonenzymatic sensor shows enhanced electrocatalytic activity towards H 2 O 2 and displays two linear ranges from 2.0 to 37.0 μM and 37.0 to 437.0 μM with a detection limit of 0.19 μM (S/N = 3), which is comparable to those electrochemical sensors based on metal oxide or noble metal/graphene composites.
研究领域:
材料科学
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电化学
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分析化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）