Shi-He Yang

The Hong Kong University of Science and Technology, Chiu-lung, Kowloon City, Hong Kong

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Publications (8)24.82 Total impact

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    ABSTRACT: Uniform arrays of coarse and smooth gold nanoparticles with diameter about 130 nm were successfully synthesized through seed-mediated growth method, separately. Scanning and transmission electron microscopy (SEM and TEM) and X-ray diffraction (XRD) have been used to study the formation and structure of the nanocomposites. The high enhancement factor for surface-enhanced Raman scattering of coarse and smooth gold nanoparticles were estimated to be about 3.1 × 106 and 2.0 × 106, respectively. It is evident that the coarse gold nanostructures has higher influence factor than the smooth gold nanostructures. Therefore, these unique properties of the coarse Au nanoparticles appear to be very promising for applications as high-performance SERS substrates.Original article
    No preview · Article · Jun 2015 · Chinese Chemical Letters
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    ABSTRACT: Five bithiazole-based organic dyes D1–D5 containing different electron donor moieties (thiophene, fluorene, carbazole, and triarylamine) in the molecular frameworks were synthesized, characterized and applied in dye-sensitized solar cells (DSSCs). The effects of electron-donating moieties of the organic dyes on their photophysical, electrochemical, and photovoltaic properties have been investigated in detail. These dyes exhibit strong charge transfer absorption bands in the visible region. Their redox potential levels were estimated by cyclic voltammetry and found to match well with the charge flow in DSSCs. The combination of broad absorption bands with fairly high extinction coefficients and appropriate redox properties makes these bithiazole-based molecules promising dyes for DSSCs. For solar cell device based on D4, the maximal monochromatic incident photon-to-current conversion efficiency (IPCE) can reach up to 68.5%, with a short-circuit photocurrent density (Jsc) of 9.61 mA cm−2, an open-circuit photovoltage (Voc) of 0.70 V and a fill factor (FF) of 0.70, which results in a power conversion efficiency (PCE) of 4.65% under illumination of an AM 1.5 solar cell simulator.
    No preview · Article · Feb 2013 · Dyes and Pigments
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    ABSTRACT: Porous MnO/C nanotubes are synthesized by a facile hydrothermal method followed by thermal annealing, and possess excellent cyclability and high rate capability as an anode for lithium ion batteries.
    No preview · Article · Jul 2012 · Chemical Communications
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    ABSTRACT: We investigated the configuration characteristic and adsorption behavior of 4,4'-thiobisbenzenethiol (TBBT) on the surface of silver nanoparticles (NPs). Under different conditions and preparation processes, several possible surface species were produced including single-end adsorption on a silicon wafer, double-end adsorption and bridge-like adsorption. Although consisting of the same molecule and nano material, different adsorption systems exhibited different spectral characteristics in the surface-enhanced Raman spectroscopy (SERS). A density functional theory (DFT) study further verified the corresponding adsorption states. The combined SERS-DFT study provided a framework towards investigating and designing adsorption systems at a molecular level, indicating the potential use in applications such as nano-sensors.
    No preview · Article · Apr 2012 · Physical Chemistry Chemical Physics
  • Li-Juan Zhao · Qi Pang · Shi-He Yang · Wei-Kun Ge · Jian-Nong Wang
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    ABSTRACT: Time resolved optical properties of CdSe tetrapod nanocrystals where studied. The results show that the decays of photoluminescence (PL) intensities for tetrapods in solution and on insulating silicon substrate can be well fitted by a bi-exponential function. Based on the emission-energy dependence of carrier lifetimes, the fast and slow PL decays of CdSe tetrapods are attributed to the recombination of delocalized carriers and the localized carriers in the localized states, respectively. By comparing the amplitude ratio of the fast-decay component to the slow-decay component for samples in solution with those on silicon, it is concluded that the slow PL decay is associated with the recombination of localized carriers in the surface defects of CdSe tetrapods.
    No preview · Article · Jun 2010 · JOURNAL OF INFRARED AND MILLIMETER WAVES
  • Dong-sheng Wang · Ke-li Han · Shi-he Yang
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    ABSTRACT: Photodissociation spectra of Ca+-pyridine complex was obtained by reflectron time of flight spectrum (RTOF). Two channels were found from difference photodissociation spectra, one was non-reactive Ca+ cation separation channel, the other one was active channel for product Ca+NH2. Product Ca+ was dominant in the whole region studied and the only product in 530-590 nm region, reactive product Ca+NH2 shared a little present in whole products. Action spectrum as a function of photolysis laser wavelength shows appearance peaks relevant to transitions of complex. Branching ratio supports the information of photodissociation too.
    No preview · Article · Jun 2009 · Chinese Journal of Chemical Physics
  • Ya-Hui Zhang · Lin Guo · Peng-Gang Yin · Rui Zhang · Qi Zhang · Shi-He Yang
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    ABSTRACT: A highly regular hexapod-like structure of PbS with six symmetric arms has been synthesized by a simple and mild chemical solution route. The hexapod-like PbS structure was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution TEM (HRTEM). The results show that each arm is perpendicular to the other four, and opposite to the last one. The arms are about 0.3-0.6 microm long, which have about 40-60 nm tips and 150-200 nm base. And the arm shows an icicle-like structure and some clear steps, and grows along 100 directions. The most possible growth mechanism discussed herein is based on the characterization results. The Raman spectra of the hexapod-like PbS structure were investigated. The results show that our products are sensitive to the laser and can be photodegraded easily.
    No preview · Article · Mar 2007 · Chemistry
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    ABSTRACT: The vertically aligned and hexagonal ZnSe nanoribbon array can be easily obtained by heating ZnSe: 0.38 en precursors (en = ethylenediamine), while ZnSe precursor nanoribbon arrays are grown directly on Zn foils in en using the solvothermal method. The nanoribbons are mostly about 4 nm in thickness, 100–300 nm in width, and 2 μm in length. The characteristics observed using scanning electron microscopy and X-ray diffraction indicate that the ZnSe precursor as well as ZnSe nanoribbons are vertically aligned on almost the whole zinc foil surface and form a large-scale uniform array. Particularly, ZnSe precursor nanoribbons are hybrid materials of ZnSe and en, while ZnSe nanoribbons are in the from of hexagonal structures. Possible growth mechanisms of the ZnSe precursor nanoribbon arrays are also proposed.
    No preview · Article · Nov 2006 · Frontiers of Physics in China

Publication Stats

111 Citations
24.82 Total Impact Points


  • 2006-2013
    • The Hong Kong University of Science and Technology
      • Department of Chemistry
      Chiu-lung, Kowloon City, Hong Kong
  • 2012
    • Beijing University of Aeronautics and Astronautics (Beihang University)
      • School of Chemistry and Environment
      Peping, Beijing, China