Shaoming Fang

Zhengzhou University of Light Industry, Cheng, Henan Sheng, China

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Publications (41)111.92 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Nanoporous 3D graphene was fabricated using NH2–SiO2 particles as a sacrificial template. For further capacitance boost, MnO2 was firstly deposited onto the nanoporous 3D graphene through the reaction between KMnO4 and graphene via the hydrothermal method. Owing to the synergistic effect between the unique nanoporous 3D graphene and the high specific capacitance of MnO2, the MnO2/nanoporous 3D graphene electrode demonstrated excellent electrochemical performance, including a high specific capacitance and an extended long cycle life. This work showed that the MnO2/nanoporous 3D graphene could present significant potential for energy storage applications.
    Materials Letters. 04/2015; 145.
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    ABSTRACT: We report a novel electrochemical sensor for the sensitive detection of Cu(II) ions based on hollow TiO2 spheres modified by fluorescein hydrozine-3,6-diacetic acid (FH). Herein, hollow TiO2 spheres were synthesized via the hydrothermal method with the carbon spheres as the template then modified by (3-aminopropyl) trimethoxysilane (APTMS) to form the amino group-modified TiO2 spheres (TiO2–APTMS). Simultaneously, FH was activated by 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride/N-hydroxysuccinimide, in which the carboxyl groups were changed to active ester groups. Consequently, TiO2–APTMS spheres could be modified by FH with the activated ester groups via the bonding of amide groups to produce the composite electrode with TiO2 and FH (Au–TiO2–FH). The resulting Au–TiO2–FH was used to develop the electrochemical sensor for the highly sensitive detection of Cu2+ in aqueous solution because of the coordination between Cu2+ and FH, the whole process of which was determined via electrochemical impedance spectroscopy. The results showed that a detection limit of 4.29 pM of the developed sensor within the range from 5 pM to 1 μM was obtained. Furthermore, the interference from other metal ions, such as K+, Na+, Ag+, Ni2+, Mn2+, Zn2+, Mg2+, and Fe3+, associated with Cu2+ analysis could be effectively inhibited. Most importantly, the developed electrochemical sensor could be reproduced and degraded by UV light irradiation because of the light degradation ability of TiO2 toward FH. This novel sensor could also be used to detect other heavy metal ions when TiO2 spheres are modified by the relative FH.
    Electrochimica Acta. 04/2015; 161.
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    ABSTRACT: Cuprous oxide and nano-chitosan composites (Cu2O@NCs) were synthesized by one-step reduction process and used as a highly sensitive electrochemical DNA sensor for detecting Hg2+ ions in aqueous solutions. The entire detection procedure of Hg2+ ions based on the developed electrochemical biosensor was investigated by electrochemical impedance, which shows that a single-stranded, thymine (T)-rich DNA was immobilized onto the surface of the composite electrode modified by Cu2O@NCs. The Cu2O@NCs modified with DNA exhibited significant sensitivity in detecting Hg2+ ions compared with pristine cuprous oxide and nano-chitosan. This behavior led to a high difference in charge-transfer resistance during Hg2+ ions detection. In Addition, Cu2O@NCs exhibited high sensitivity and stability for detecting Hg2+ ions with a detection limit of 0.15 nmol L−1 within the range of 1 to 100 nmol L−1 of Hg2+ ions. The fabricated Cu2O@NCs may be used as a novel biosensor for detecting heavy metal ions in water or the environment.
    Electrochimica Acta 02/2015; · 4.09 Impact Factor
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    ABSTRACT: We report a novel kind of electrochemical biosensor based on Mn3(PO4)2-like nanoflowers for detecting ractopamine. Mn3(PO4)2-protein hybrid nanocomposites were synthesized by self-assembly method, in which proteins such as immunoglobulin G (IgG), bovine serum albumin (BSA), and ractopamine antibody (RACanti) play an important role in the production of nanoflowers. To evaluate the efficiency of different biosensors based on Mn3(PO4)2-like nanoflowers, three kinds of nanocomposites were prepared, i.e., the nanocomposite of Mn3(PO4)2 and IgG (Mn3(PO4)2@IgG), RACanti (Mn3(PO4)2@RACanti), and BSA together with Au nanoparticles (Mn3(PO4)2@BSA@AuNPs). Different detection approaches were designed and carried out for varied biosensors. Mn3(PO4)2@BSA@AuNP and Mn3(PO4)2@RACanti nanocomposites were used as the sensitive layer of the electrochemical biosensor for RAC detection. However, only after RACanti adsorption onto the Mn3(PO4)2@IgG nanocomposite surface, the developed electrochemical biosensor was applied to detect ractopamine. Results showed that these Mn3(PO4)2-like nanoflowers exhibited high chemical activity and good electrochemical performance. All ractopamine detection procedures were determined by electrochemical measurements, providing extremely low detection limits of 9.32, 4.6, and 26 pg·mL−1 for three kinds of nanoflowers. Therefore, Mn3(PO4)2-like nanoflowers could also be utilized as electrochemical biosensors for various detection procedures in different fields.
    Sensors and Actuators B Chemical 02/2015; · 3.84 Impact Factor
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    ABSTRACT: In this paper, we report on the facile one-step synthesis of nanoporous cuprous oxide microspheres on reduced graphene oxide (Cu2OMS-rGO) by synchronously reducing Cu2+ ions and GO with ascorbic acid sodium, followed by their application as electrochemical biosensors for the detection of mercury ions in water. After detailed characterizations of the basic chemical components, crystal structure, surface morphology, and electrochemical properties of the Cu2OMS-rGO nanocomposites, single-stranded and thymine (T)-rich oligonucleotides were successively immobilized onto the surface of the composite electrode modified by Cu2OMS-rGO. Upon introduction of the target analyte, Hg2+ ions were intercalated into the DNA polyion complex membrane based on T-Hg2+-T coordination chemistry. The results show that the Cu2OMS-rGO composite has high sensitivity for the detection of Hg2+, with a detection limit of 8.62 pM within the range of 0.05 nM to 40 nM. Therefore, the Cu2OMS-rGO composite could be utilized as a novel biosensor for the detection of heavy metal ions in water or in the environment. The strategy yielded excellent selectivity of Hg2+ against other interfering metal ions. In addition, the developed DNA sensor for the determination of Hg2+ ions could be reproduced up to 10 cycles, and the recovery was approximately 95%.
    New Journal of Chemistry 09/2014; · 3.16 Impact Factor
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    ABSTRACT: The morphological control of mesoporous silica without any additives has attracted much attention. Discrete rod-like and string-of-beads like mesoporous SBA-15 can be achieved under ultrasound irradiation without changing the composition of synthesis system. The smaller particles of SBA-15 showed improved lysozyme immobilization capacity and higher adsorption rate over conventional rope-like SBA-15.
    Ultrasonics Sonochemistry 08/2014; · 3.82 Impact Factor
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    ABSTRACT: A quaternary nanocomposite Fe3O4@SiO2@TiO2/graphene oxide (GO) was for the first time successfully synthesized in this work for the repeated use in simultaneous adsorption and photocatalytic degradation of aromatically structured chemical pollutants. The resulting sample was characterized by TEM, XRD, FTIR, TG-DTG, XPS, PL, and VSM. Its photocatalytic activity was evaluated in the photocatalytic degradation of rhodamine B (RhB) under high-pressure mercury lamp irradiation. The results showed that about 63% of RhB was absorbed onto the prepared Fe3O4@SiO2@TiO2/GO nanocomposites by just 30 minute mixing, and after 120 min high-pressure mercury lamp irradiation, about 92.03% of RhB was converted. The photocatalytic degradation followed pseudo first-order reaction with an apparent rate constant of 0.0136 min(-1). Compared with the Fe3O4@SiO2@TiO2 nanoparticles, it exhibits an excellent ability to adsorb aromatic compounds via π-π stacking and a higher photocatalytic activity due to the presence of GO. In addition, the synthesized nanomaterial exhibited good magnetic response and the reusability study suggested that the prepared nanocomposites were stable enough and maintained high degradation rate and catalyst recovery even after five cycles, verifying their potential application in water purification.
    Dalton Transactions 08/2014; · 4.10 Impact Factor
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    ABSTRACT: Imine-linked covalent organic framework on amino functionalized silicon substrate was constructed via a step-wise reaction between 1,3,5-benzenetricarboxaldehyde and 1,4-diaminobenzene. The obtained material was used as biosensor for bovine serum albumin (BSA) adsorption and probe DNA immobilization, which extended the application of covalent organic frameworks (COFs) to a new field.
    Chinese Journal of Chemistry 07/2014; · 0.92 Impact Factor
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    ABSTRACT: We report on a novel nanoarchitecture for use in highly bioactive electrochemical biosensors. It consists of multilayers of nanostructured plasma-polymerized pyrrole (ppPY) and nanosheets of electrically conductive graphene. The ppPY films were deposited by plasma-enhanced chemical vapor deposition on a graphene surface to form nanostructured composites (G-ppPY). The G-ppPY films were then coated with protein (BSA as a model) by adsorption, and then with DNA. The adsorption of protein and DNA on the nanocomposite was studied by electrochemical impedance spectroscopy and with a quartz crystal microbalance. Results demonstrated that the adsorption of biomolecules on G-ppPY films causes a higher variation in its electrochemical properties and adsorbed amount than that on a plain ppPY surface. This indicates that the presence of graphene can enhance the electrochemical activity of ppPY without reducing the sensitivity of biomolecular adsorption. Figure A novel nanoarchitecture is developed for use in highly bioactive electrochemical biosensors, which is composed of multilayers of nanostructured plasma-polymerized pyrrole and electrically conductive graphene nanosheets. The presence of graphene can enhance the electrochemical activity of ppPY without reducing the sensitivity of biomolecular adsorption.
    Microchimica Acta 07/2014; 181(9-10):1059-1067. · 3.72 Impact Factor
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    ABSTRACT: In this study, octavinyl polyhedral oligomeric silsesquioxane (OVPS) is used as the cross-linker instead of N, N’-methylenebisacrylamide (BIS) to copolymerize with 2-(dimethylamino) ethyl methacrylate (DMAEMA) or DMAEMA and N-isopropylacrylamide (NIPAM) to prepare hybrid hydrogels: P(OVPS-co-DMAEMA) and P(OVPS-co-DMAEMA-co- NIPAM). The prepared hydrogels are transparent and show dual response to temperature and pH. The hydrogels are characterized by FT-IR, SEM, XRD, DSC, TGA, DMA and tensile tests. Their mechanical properties, swelling ratio, deswelling, reswelling behaviors as well as drug release properties were investigated. The results indicate that OVPS can be incorporated into polymer networks in proportion to feed ratios. P(OVPS-co-DMAEMA) hydrogel exhibits more homogenous interior structure, higher swelling ratio and faster response than the conventional hydrogel prepared with BIS. Moreover, the incorporation of OVPS enhances the compression and tensile properties of the hydrogels. The feed ratios of OVPS and NIPAM greatly effect on volume phase transition temperature (VPTT), thermal-sensitivity, swelling behavior, mechanical property and drug release property of the hybrid hydrogels. The prepared dual responsive POSS-containing hydrogels are expected to be used as biomedical materials in drug release and tissue engineering.
    Polymer International 04/2014; 63(12). · 2.13 Impact Factor
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    ABSTRACT: A label-free and effective aptasensor based on an amino-functionalized nanocomposite of graphene and plasma-polymerized allylamine (G–PPAA) was developed for thrombin detection. Graphene was assembled on the substrate, followed by the self-assembly of octadecylamine (OTA) to protect the graphene from etching by subsequent plasma irradiation. Afterward, PPAA was deposited onto the graphene surface with the self-assembled OTA, and the nanocomposite with amino groups was fabricated. The label-free thrombin aptamer was immobilized onto the amino-functionalized nanocomposite matrix via electrostatic interaction between the phosphate groups of the aptamer and the amino groups in PPAA. The process was investigated using impedimetric detection and a quartz crystal microbalance (QCM). The chemical compositions, surface morphology, and electrochemical properties were found to be dependent on the plasma conditions used in the polymer deposition. The amounts and kinetics of aptamer immobilization and thrombin detection were determined using QCM measurements. A relatively high affinity constant of aptamer immobilization and low detection limit for thrombin were achieved by using the G–PPAA film as the biosensor matrix. Results suggest that G–PPAA films can be applied in gene therapy and protein detection.
    J. Mater. Chem. B. 02/2014; 2(11).
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    ABSTRACT: Nanocomposites of Mn3O4 nanoparticles and graphene (GR) nanosheets - Mn3O4@GR can be made by growing Mn3O4 nanoparticles directly on the surfaces of GR in solvothermal reactions. The asymmetric supercapacitors constructed with Mn3O4@GR as positive and activated carbon (AC) as negative electrodes, respectively, show highly enhanced performances in energy storage. It was found that the electrolytes employed in constructing electrodes of the devices can influence the performances of Mn3O4@GR supercapacitors dramatically. Compared to their energy density in KOH electrolyte, the devices exhibit improved charge storage performances in Na2SO4 electrolyte. Furthermore, the charge storage abilities of the devices are closely related to the amount of Mn3O4 nanoparticles loaded onto the surface of GR nanosheets. The performances of Mn3O4@GR//AC asymmetric supercapacitors can be optimized by carefully tailoring the composition of electrode materials and adjusting the electrolytes for making the devices.
    Journal of Power Sources 01/2014; · 5.21 Impact Factor
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    ABSTRACT: The direct reactions between ascorbic acid (AA) and palladium salts can produce homogeneous Pd nanoparticles on a large scale by grinding or shaking the two reactants together for ca. 2 minutes at room temperature. The size of homogeneous Pd nanoparticles can be tuned conveniently by using different palladium salts as precursors in the reactions without adding any solvent and organic protectors. Compared to Pd nanoparticles with much smaller sizes of ca. 2.7 nm produced by grinding a solid mixture of AA and Pd(CH3COO)2, homogeneous Pd nanoparticles of 35.6 ± 5 nm can be generated in the direct reaction between AA and Pd(NO3)2·2H2O. It was found that AA can reduce Pd2+ to Pd0 to form Pd nanoparticles directly, accompanied by its oxidation to 2,3-diketogulonic acid (2,3-DKG) and a series of fragment species of 2,3-DKG simultaneously. The small amount of crystalline water in Pd(NO3)2·2H2O can promote the formation of Pd nanoparticles dramatically, compared to the reactions conducted with Pd(CH3COO)2, Pd(NO3)2 and PdCl2 without crystalline water. Based on the experimental results, a two-step reaction mechanism is proposed to understand the formation of Pd nanoparticles. The quasi solid-state features of the direct reactions could lead to defects of high concentration on the surface of the as-prepared Pd nanoparticles, which can be applied to the catalysis of the Suzuki reaction immediately after their formation in the reactions.
    J. Mater. Chem. A. 12/2013; 2(5).
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    ABSTRACT: ZnO twin-spheres topologically exposed in ±(001) polar facets have been successfully produced in large scale. The fragmentary and hexagonal ±(001) facets of ZnO tilt and assemble gradually for 8 - 12 generations to form supercrystals. The surfactant effect on the formation of ZnO supercrystals reveals that their structure stepwise evolves from prisms to dumbbells to twin-spheres exposed in ±(001) facets and eventually to twin-spheres covered with dots. A hollow ring around a prism, which connects two hemispheres of the supercrystals, is finally sealed inside each of the twin-spheres. Based on the experimental observations, a stepwise self-assembly mechanism is proposed to understand the formation of the supercrystals. It is also observed that the ZnO twin-spheres exhibit anisotropic blue emission in intensity attributed to their special surfaces exposed in ±(001) facets. Novel devices could be designed and fabricated through carefully tailoring the microstructure of ZnO supercrystals.
    ACS Nano 11/2013; · 12.03 Impact Factor
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    ABSTRACT: This study investigates the application of Plasma-polymerized pyrrole (ppPY) as bioactive platform for DNA immobilization and cell adhesion based on the fundamental properties of ppPY, such as chemical structure, electrochemical property, and protein adsorption. Variations in electrochemical properties of the ppPY film deposited under different plasma conditions before and after DNA immobilization were measured using electrochemical impedance spectroscopy (EIS). The equilibrium concentration of the probe DNA immobilized on the ppPY surface was deduced by detecting the variations in the surface charge transfer resistance (Rct ) of the ppPY films after DNA immobilization with different concentrations. In addition, the detection limit of the target DNA hybridization with probe DNA, the association constant, Ka , and the dissociation constant were deduced from Langmuir isotherm equations simulated using the experimental data collected by EIS. Moreover, inverted microscope was used to observe the cell adhesions onto the surface of the ppPY films prepared under different plasma conditions. Different adhesive behaviors of cells were observed, demonstrating that ppPY films could be an alternative biomaterial used as the sensitive layer for DNA sensor or cell adhesion.
    Biopolymers 10/2013; · 2.29 Impact Factor
  • Materials Research Bulletin 10/2013; 48(10):4093-4099. · 1.97 Impact Factor
  • Lijun Gao, Liming Zhou, Shaoming Fang, Chao Wu
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    ABSTRACT: A series of new crosslinked copoly(urethane-methacrylate)s (CPUAs) were synthesized by the polymerization of new urethane–methacrylate macromonomers with double bonds at the end of the chain, which were prepared from isophorone diisocyanate, β-hydroxyethyl methacrylate, different content of poly(1,2-propanediol ortho-phthalate) (PPP), and poly(ethylene glycol) 600. The properties of CPUAs were measured by dynamic mechanical analysis, thermogravimetric analysis, wide-angle X-ray diffraction, water uptake, and optical properties testing, and mechanical performance measurements. The results revealed that the greater PPP contents in the CPUAs lead to the higher glass transition temperature, hardness, lower thermal stability, and water uptake. Obtained CPUAs present the good transparence. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
    Journal of Applied Polymer Science 06/2013; 128(6). · 1.40 Impact Factor
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    ABSTRACT: Free-standing and porous hierarchical nanoarchitectures constructed with cobalt cobaltite (Co3O4) nanowalls have been successfully synthesized in large scale by calcining three dimensional (3D) hierarchical nanostructures consisting of single crystalline cobalt carbonate hydroxide hydrate – Co(CO3)0.5(OH)·0.11H2O nanowalls prepared with a solvothermal method. The step-by-step decomposition of the precursor can generate porous Co3O4 nanowalls with BET surface area of 88.34 m2 g−1. The as-prepared Co3O4 nanoarchitectures show superior specific capacitance to the most Co3O4 supercapacitor electrode materials to date. After continuously cycled for 1000 times of charge–discharge at 4 A g−1, the supercapacitors can retain ca 92.3% of their original specific capacitances. The excellent performances of the devices can be attributed to the porous and hierarchical 3D nanostructure of the materials.
    Journal of Power Sources 12/2012; 219:140–146. · 5.21 Impact Factor
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    ABSTRACT: Well-dispersed multiwalled carbon nanotubes/polyurethane (MWCNTs/PU) composites were synthesized in situ polymerization based on treating MWCNTs with nitric acid and silane coupling agent. The morphology and degree of dispersion of the MWCNTs were studied using a high resolution transmission electron microscopy (HR-TEM) and X-ray powder diffraction (XRD). The result showed that MWCNTs could be dispersed still in the PU matrix well with the addition of 2 wt% MWCNTs. The thermal and mechanical properties of the composites were characterized by dynamic mechanical thermal analysis, thermogravimetric analysis, tensile, and impact testing. The result suggested that the glass transition temperature (Tg) of composites increased greatly with increasing MWCNTs content slightly, and the MWCNTs is also helpful to improve mechanical properties of composites. Furthermore, the composites have an excellent mechanical property with the addition of 0.5 wt% MWCNTs. The electrical property testing indicates that the MWCNTs can improve evidently the electrical properties of composites when adding 1 wt% MWCNTs to the PU matrix. The volume resistivity of composites reaches to an equilibrium value. POLYM. COMPOS., 33:1866–1873, 2012. © 2012 Society of Plastics Engineers
    Polymer Composites 11/2012; 33(11). · 1.48 Impact Factor
  • Advanced Functional Materials 10/2012; 22(19). · 10.44 Impact Factor