Mingwang Shao

Soochow University (PRC), Wu-hsien, Jiangsu Sheng, China

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Publications (147)515.59 Total impact

  • Suning Gao · Lili Zhu · Liangbin Liu · Aimin Gao · Fan Liao · Mingwang Shao
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    ABSTRACT: The exploration and optimization of electrodes in capacitors with high capacitance, excellent rate capacity and considerable energy density without sacrificing power density remain a great challenge at a high mass loading. Herein, a simple and novel strategy is presented to activate carbon cloth via chemical oxidation and then followed by gamma-ray irradiated reduction process for removing the oxygen functional groups bonded on the surface of carbon cloth. Activated carbon cloth with extensive pore distribution and high surface area was made up into electrodes to measure its energy storage performance Despite only 5.6% change in surface area from oxidized to gamma irradiated carbon cloth (118 and 124.6 m2/g), the electrode based on gamma irradiated carbon cloth shows an obvious 74.6% enhancement of area capacitance (from 402 to 702 mF/cm2) critically due to the removal of the oxygen functional groups boned on the surface of carbon cloth by the gamma reduction process. It also provides a desirable rate performance of 86% (610 mF/cm2 at 20 mA/cm2) and 110.5% of its original capacitance after 30000 cycles. In order to further corroborate the prospect of the activated carbon cloth, a symmetric device based on the activated carbon cloth was assembled and it shows a maximum energy density of 0.556 mW·h/cm3 and a supreme power density of 1016 mW/cm3. The promising energy and power characteristics and excellent cycling stability of the activated carbon cloth have high potential for low-cost, high-performance, and flexible supercapacitors.
    No preview · Article · Jan 2016
  • Shuzhen Ma · Qian Cai · Kailing Lu · Fan Liao · Mingwang Shao
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    ABSTRACT: The bi-functional Au/FeS (Au/Co3O4) composite was fabricated by in situ reducing Au nanoparticles onto the surface of FeS (Co3O4). The as-prepared FeS possessed a multi-structure composed of plenty of nanoplates, which were coated by Au nanoparticles with an average size of ~47.5 nm. While the Co3O4 showed a thin hexagonal sheet containing Au nanoparticles on its surface with an average size of ~79.0 nm. Both the as-prepared Au/FeS and Au/Co3O4 composites exhibited excellent SERS performance, capable of enhancing the Raman signals of R6G molecules with the enhancement factor up to 1.81 × 106 and 7.60 × 104, respectively. Moreover, Au/FeS (Au/Co3O4) composite also has been verified to have intrinsic peroxidase-like activity, which could decompose H2O2 into hydroxyl radicals and then degrade organic pollutants into small molecules. Therefore, SERS can be used to real-time and in situ monitoring the degradation process of R6G molecules, employing the Au/FeS (Au/Co3O4) composite both as SERS substrate and catalyst. Graphical abstract SERS was used to real-time and in situ monitoring the degradation of R6G, employing the Au/FeS and Au/Co3O4 composites both as SERS substrates and catalysts.
    No preview · Article · Jan 2016 · Journal of Nanoparticle Research
  • Liangbin Liu · Kailing Lu · Tao Wang · Fan Liao · Mingfa Peng · Mingwang Shao
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    ABSTRACT: The α-quartz could grow at the interface of silicon nanowires (SiNWs) after thermal treatment. The SiNW/α-quartz composite was utilized as an active layer to fabricate piezoelectric nanogenerators on a flexible polyethylene terephthalate substrate, capable of converting mechanical energy into electricity. An insulative Al2O3 layer was designed to fill the gaps of the composite to avoid the leakage of current by atomic layer deposition and reactive ion etching process. The flexible nanogenerators produced an average short-circuit current of 0.6 μA under the force of 60 N and the maximum power value reached about 380 nW with the load resistance of 20 MΩ.
    No preview · Article · Dec 2015
  • Fei Hu · Qian Cai · Fan Liao · Mingwang Shao · Shuit-Tong Lee
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    ABSTRACT: Nanomaterial-based generators are a highly promising power supply for micro/nanoscale devices, capable of directly harvesting energy from ambient sources without the need for batteries. These generators have been designed within four main types: piezoelectric, triboelectric, thermoelectric, and electret effects, and consist of ZnO-based, silicon-based, ferroelectric-material-based, polymer-based, and graphene-based examples. The representative achievements, current challenges, and future prospects of these nanogenerators are discussed.
    No preview · Article · Sep 2015 · Small
  • Jie Zhang · Fan Liao · Yan Zhu · Jianping Sun · Mingwang Shao
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    ABSTRACT: The visible-light-induced gas sensors based on the ternary compound CdSxSe1-x nanoribbons have been successfully fabricated. The compound was obtained via a metal-catalyzed physical evaporation route. X-ray diffraction, scanning electron microscopy and transmission electron microscopy were employed to confirm the formation and composition of CdSxSe1-x nanoribbons. The optimum operating temperature of CdSxSe1-x-based gas sensors in the dark is 200 °C when they were used in detection of acetic acid with the concentration range from 25 to 400 ppm, while the optimum operating temperature could be reduced by approximately 100 °C under visible light irradiation. More importantly, the sensors can even work efficiently at room temperature under visible light. The calculated limit of detection decreased from 1.13 ppm (200 °C, dark) to 0.87 ppm (100 °C, visible light) and 1.03 ppm (room temperature, visible light), respectively. The enhanced sensing properties of the CdSxSe1-x-based gas sensors were due to photo-generated electrons. This work will pave a way for the development of the low-cost practical gas sensors.
    No preview · Article · Aug 2015 · Sensors and Actuators B Chemical
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    Fan Liao · Tao Wang · Mingwang Shao
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    ABSTRACT: Over the last few years, silicon nanowires (SiNWs) have come under intensive researches due to their electrical, optical, mechanical, thermal, and chemical properties. On account of their large surface-to-volume ratio and easy modification, composites based on SiNWs have won a special status in the wide application fields. In this review, we summarize the essential aspects of catalytic activities based on SiNWs. An up-to-date overview of SiNW-based catalysts, including various metal-modified-SiNWs as well as hydrogen terminated SiNWs are discussed in detail. In addition, surface doping effect is illustrated to promote the understanding of catalytic activity.
    Full-text · Article · Jul 2015 · Journal of Materials Science Materials in Electronics
  • Suning Gao · Fan Liao · Shuzhen Ma · Lili Zhu · Mingwang Shao
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    ABSTRACT: Network-like mesoporous NiCo2O4 arrays were grown on flexible carbon cloth via a hydrothermal method first assisted by polyethylene oxide – polypropylene oxide – polyethylene oxide and ethylene glycol followed by thermal treatment. These arrays were made up of nanoflakes (thickness varies from 5 to 15 nm) and multilevel pores, giving a vast specific surface area of 130.2 m2 g−1. The as-prepared products were fabricated into electrodes to conduct electrochemical experiments. The results showed a high capacitance of 1843.3 F g−1 (volume capacitance of 33.8 F cm−3) at 1 A g−1, satisfied constant rate performance of 80% shifting from 1 to 32 A g−1 (1481 F g−1), and only a 10% loss of its capacitance even after 4000 recycles at a consistent current density of 10 A g−1. A symmetric supercapacitor based on NWM NiCo2O4 was assembled and it exhibited a high specific capacitance of 269 F g−1 at 1 A g−1 and a preferable energy density of 38.3 W h kg−1 at a power density of 396 W kg−1. The optimum overall performance of both high rate capability and cycle stability make the network-like mesoporous NiCo2O4 the prime candidate for application in electrochemical supercapacitors.
    No preview · Article · Jul 2015
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    ABSTRACT: It is currently a very active research area in developing new types of substrates which integrate various nanomaterials for surface-enhanced Raman scattering (SERS) techniques. Here we report a unique approach to prepare SERS substrates with reproducible performance. It is featured with silicon mold-assisted magnetic assembling of superparamagnetic Fe3O4@Au nanoparticle clusters (NCs) into arrayed microstructures on a wafer scale. This approach enables the fabrication of both silicon-based and hydrogel-based substrates in a sequential manner. We have demonstrated that strong SERS signals can be harvested from these substrates due to efficient coupling effect between Fe3O4@Au NCs, wih enhancement factors >106. These substrates have been confirmed to provide reproducible SERS signals, with low variations in different locations or batches of samples. We investigate the spatial distributions of electromagnetic field enhancement around Fe3O4@Au NCs assemblies using finite-difference-time-domain (FDTD) simulations. The proceudre to prepare the substrates is straightforward and fast. The silicon mold can be easily cleaned out and refilled with Fe3O4@Au NCs assisted by a magnet, therefore being re-useable for many cycles. Our approach has integrated microarray technologies and provided a platform for thousands of independently addressable SERS detections, in order to meet the requirements of rapid, robust, and high throughput performance.
    No preview · Article · May 2015 · Nanoscale
  • Lili Zhu · Qian Cai · Fan Liao · Minqi Sheng · Bin Wu · Mingwang Shao
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    ABSTRACT: Ruthenium nanoparticles modified silicon nanowires (Ru/SiNWs) were prepared by directly reducing Ru ions with Si-H bonds. The composites with different content of Ru (denoted as Ru/SiNW-x, x means the relative molar ratio of Ru to SiNW) were evaluated as electrocatalysts for the hydrogen evolution reaction (HER). Ru/SiNW-42.9 showed excellent electrocatalytic activity in the oxygen-free 0.5 M H2SO4 medium. The Tafel slope of Ru/SiNW-42.9 was 81 mV/decade, indicating its catalytic effect was even better than pure Ru particles. SiNWs modified with proper content of Ru may be a promising electrocatalyst for HER.
    No preview · Article · Jan 2015 · Electrochemistry Communications
  • Qian Cai · Fei Hu · Shuit-Tong Lee · Fan Liao · Yanqing Li · Mingwang Shao
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    ABSTRACT: In this paper, the Fe3O4/Au nanocomposites were fabricated and employed as surface-enhanced infrared absorption (SEIRA) substrates. The superparamagnetic nature of Fe3O4/Au nanocomposites makes them suitable for controlled magnetic manipulation. The infrared absorption enhancements of Fe3O4/Au composite were improved as the magnetic field intensity increasing both for mercaptobenzoic acid and nitrobenzoic acid probe molecules. When the magnetic field intensities increase to 280 mT, the infrared enhancement could raise up to 3.3 and 10.7 times for -SH and -NO2 groups, respectively. The enhancement is due to the synergy of localized surface plasmon resonance of Au and the magnetism of Fe3O4. Under the strong magnetic field, the superparamagnetic Fe3O4/Au nanoparticles are highly concentrated, leading to the increase number of SEIRA “active sites” and the surface density of Au nanoparticles. The synergistic effects of both Fe3O4 and Au nanoparticles make the composites an excellent SEIRA substrate. In addition, the Fe3O4/Au nanocomposites were also utilized to determine the thiol and thione tautomers in -SH based molecules.
    No preview · Article · Jan 2015 · Applied Physics Letters
  • Zhaoshun Zhang · Chunye Wen · Fan Liao · Lili Zhu · Mingwang Shao
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    ABSTRACT: A facile interface self-assembly method was proposed to fabricate the gold monolayer film without any specific molecular cross-linkers. The film was served as a surface-enhanced Raman scattering substrate, which exhibited high enhancement and reproducibility to the 1 × 10-9 M rhodamine 6G aqueous solution. Based on the substrate, the in situ and real-time monitoring for the reduction of p-nitrophenol to p-aminophenol was demonstrated successfully.
    No preview · Article · Jan 2015 · Asian Journal of Chemistry
  • Zhaoshun Zhang · Fan Liao · Shuzhen Ma · Suning Gao · Mingwang Shao
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    ABSTRACT: Uniform and dense Au nanoparticles grown on Ge (Au/Ge) were fabricated by a facile galvanic displacement method and employed as surface-enhanced Raman scattering (SERS) substrates. The substrates exhibited excellent reproducibility in the detection of rhodamine 6G aqueous solution with a relative standard deviation of <20%. The substrate showed a high Raman enhancement factor of 3.44 × 106. This superior SERS sensitivity was numerical confirmed by the three-dimensional finite-difference time-domain method, which demonstrated a stronger electric field intensity (|E/E0|2) distribution around the Au nanoparticles grown on Ge. This facile and low-cost prepared Au/Ge substrate with high SERS sensitivity and reproducibility might have potential applications in monitoring in situ reaction in aqueous solution. Copyright © 2014 John Wiley & Sons, Ltd.
    No preview · Article · Dec 2014 · Surface and Interface Analysis
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    ABSTRACT: There is a strong correlation between the surface enhanced Raman scattering (SERS) enhancement factor (EF), the excitation wavelength, and the feature properties (composition, size, geometry, and analytes). The prediction of the EF of specific substrates, crucial to the quantitative SERS detection, is however still very difficult. The present work presents smart liquid SERS substrates consisting of suspensions of Fe3O4/Au nanoparticles, which provide high spot-to-spot uniformity, reproducibility and good reversibility. The EF of these substrates can be reversibly tuned by applying an external magnetic field. The EF magnetic tuning is within 2 orders of magnitude per substrate in the range of 10(4)-10(7). The ability to reversibly adjust the SERS EF enables to reduce EF variations caused by external effects such as substrate-to-substrate differences and long-term-storage degradation. This improves the quantitative detection of analytes and might be a significant step forward in employing SERS for practical applications.
    Preview · Article · Nov 2014 · Scientific Reports
  • Tao Wang · Fei Hu · Emmanuel Ikhile · Fan Liao · Yanqing Li · Mingwang Shao
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    ABSTRACT: A two-step galvanic displacement reaction was employed to synthesize Ag-Au nanoparticles grafted on Ge wafer due to the different equilibrium potentials: the Ge wafer was employed to reduce silver ions and grow Ag nanoparticles first; and then it reduced gold ions and grew Au nanoparticles among the gaps of Ag nanoparticles. When they were employed as SERS substrates to detect 200 random spots, to the best of our knowledge, the lowest relative standard deviation (RSD) of less than 7% was obtained by using Rhodamine 6G (1 × 10-9 M) as probe molecules in the aqueous detection. Crystal violet solution (1 × 10-8 M) was also detected with an ultra low RSD of less than 8%. The result of the electric field distribution by the finite difference time domain simulation further explained the distinguished sensitivity and uniformity of these substrates. The high uniformity and reproducibility of this SERS substrate may benefit SERS quantitative detection in biology field in the future.
    No preview · Article · Nov 2014
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    ABSTRACT: This work presents a method of generating electric current based on the defects of few-layer boron nitride nanosheets (BNNSs). The density functional theory calculations showed that the atomic charge of B atom in acetone was more positive than in water. The electrostatic force microscopy measurements illustrated that the local electrical potential was 0.35 mV in acetone, while the potential signal was very difficult to be captured when using water as the dispersant. This effect was further demonstrated by the performance of the acoustic energy harvesting nanogenerator: the BNNSs were assembled into a film when dispersed in acetone and then integrated into the generator device, generating average output current of about 0.98 nA, which was much better than 0.2 nA, the average output current of another device with water as the dispersant. These results demonstrated that solvent effects made the as-prepared BNNSs carry net charges, which could be utilized to harvest acoustic energy and generate current.
    No preview · Article · Nov 2014 · ACS Applied Materials & Interfaces
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    ABSTRACT: AgFeO2 nanoparticles were synthesized via a facile hydrothermal method and irradiated by various doses of gamma ray. The products were characterized with X-ray powder diffraction, UV-vis absorption spectrum and transmission electron microscope. The results revealed that the crystal structure, morphology and size of the samples remained unchanged after irradiation, while the intensity of UV-Vis spectra increased with irradiation dose increasing. In addition, gamma ray irradiation improved the performance of gas sensor based on the AgFeO2 nanoparticles including the optimum operating temperature and sensitivity, which might be ascribed to the generation of defects.
    No preview · Article · Nov 2014 · Journal of Solid State Chemistry
  • Kui Yin · Fan Liao · Yan Zhu · Aimin Gao · Tao Wang · Mingwang Shao
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    ABSTRACT: Ag/Ag2SnO3 nanoparticles were synthesized by irradiating Ag2SnO3 with different doses of gamma ray ranging from 0 to 500 kGy. The irradiated products were employed to detect two reducing gases (ethanol and nitromethane) and one oxidizing gas (acetic acid). The response was found to be dependent on irradiation dose, which influenced the content of Ag. The results showed that the best gas-sensing performance was achieved at the dose of 400 kGy: the responses were enhanced 9, 6.3 and 10.6 folds compared with the unirradiated Ag2SnO3 for ethanol, nitromethane and acetic acid, respectively.
    No preview · Article · Oct 2014
  • Yan Zhu · Fan Liao · Suning Gao · Aimin Gao · Shunkai Lu · Mingwang Shao
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    ABSTRACT: Additive-free gold nanoparticles (AuNPs) were successfully synthesized by gamma ray irradiation in aqueous solution using HAuCl4 as precursor. The size was optimized by regulating the concentration of HAuCl4 and the dose of irradiation. The electrocatalytic performance of AuNPs for the oxidation of glucose was demonstrated. The obtained AuNPs displayed superior electrocatalysis for the oxidation of glucose with a linear response range from 50 mu M to 16 mM, and the limit of detection was estimated to be 14.2 mu M. The surface-enhanced Raman scattering (SERS) activity of the synthesized AuNPs was also investigated, which showed excellent SERS enhancement in the low concentration detection (1x10(-7) M) of Rhodamine 6G solution with an enhancement factor of 1.4 x 10(6). (c) 2014 The Electrochemical Society. All rights reserved.
    No preview · Article · Aug 2014 · Journal of The Electrochemical Society
  • Qian Cai · Shunkai Lu · Fan Liao · Yanqing Li · Shuzhen Ma · Mingwang Shao
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    ABSTRACT: In this paper, Au/CuS composites were fabricated by a two-step method based on a facile solvothermal approach combined with the in situ reduction. It was demonstrated that the Au/CuS composite not only exhibited excellent peroxidase-like catalytic activity in the oxidation of the typical peroxidases (o-phenylenediamine and diaminobenzidine), but also showed promising SERS performance with remarkable sensitivity and high reproducibility. Based on these properties, the bi-functional Au/CuS composite was employed both as a catalyst for degrading a pollutant (Rhodamine 6G) and a SERS substrate for real-time monitoring of the degradation process quantitatively.
    No preview · Article · Jun 2014 · Nanoscale
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    ABSTRACT: A visible light-enhanced gas sensor based on cadmium selenide (CdSe) nanoribbons has been successfully developed. These nanoribbons were synthesized by a gold-catalyzed vapor-liquid-solid method and employed as visible-light-activated gas sensors for 50 to 1000 ppm ethanol at 200 °C. Visible light illumination on the surface of CdSe nanoribbons could produce more holes and increase the conductance of the sensor which significantly enhanced the gas response.
    No preview · Article · May 2014 · CrystEngComm

Publication Stats

3k Citations
515.59 Total Impact Points


  • 2008-2015
    • Soochow University (PRC)
      • • Jiangsu Key Laboratory for Carbon-based Functional Materials and Devices
      • • Functional Nano & Soft Materials Laboratory
      Wu-hsien, Jiangsu Sheng, China
  • 2003-2011
    • Anhui Normal University
      Wu-hu-shih, Anhui Sheng, China
  • 2002-2004
    • University of Science and Technology of China
      • Department of Chemistry
      Luchow, Anhui Sheng, China