Jianbo Liang

University of Science and Technology of China, Luchow, Anhui Sheng, China

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Publications (21)64.26 Total impact

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    ABSTRACT: The phase transition of CdSe nanocrystallines from zinc blende to wurtzite phase can be controlled by varying the volume ratio of ethanolamine (EA) and water (WA) in their mixed solution and the morphologies of the CdSe nanocrystals are controlled simultaneously. The phase transition has been demonstrated by XRD patterns and HRTEM images. The samples are investigated by Raman spectrum. The Raman shifts of the samples show a gradual blue shift with the gradual transformation from zinc blende to wurtzite CdSe phase. This method is convenient and controllable which can provide a strategy way to control the phase and morphology of the nanomaterials and study their phase transitions in nanoscale field.
    No preview · Article · Jul 2008 · Solid State Sciences
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    ABSTRACT: SnO2 urchin-like structures composed of nanorods with diameters of 10–15nm and lengths of 50–70nm have been hydrothermally synthesized via a H2O2-assisted route without any surfactant, using SnCl2 as raw material. With the addition of methenamine (HMT), SnO2 hollow microspheres with diameters of 2–3μm and shell thickness of 60–140nm were also prepared. The as-obtained products were examined using diverse techniques including X-ray powder diffraction (XRD), Raman spectroscopy, field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), selected-area electron diffraction (SAED), high-resolution TEM and photoluminescence spectra. The gas sensitivity experiments have demonstrated that the as-synthesized SnO2 materials exhibit good sensitivity to alcohol vapors, which may offer potential applications in gas sensors.
    No preview · Article · Jan 2008 · Journal of Solid State Chemistry
  • XiaoKai Hu · DeKun Ma · JianBo Liang · Qin Xie · YongChun Zhu · YiTai Qian
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    ABSTRACT: Hexagonal V0.13Mo0.87O2.935 nanowires were hydrothermally synthesized at 220 degrees C for the first time. X-ray diffraction and field-emission scanning electron microscopy were utilized to characterize the phase and morphology of the nanowires, respectively. Transmission electron microscopy and selected area electron diffraction indicate that the nanowires are single crystalline, growing along the [001] direction. Interestingly, the nanowires easily become amorphous under the electron irradiation. The comparative hydrothermal experiments show that the molar ratio between the starting reagents of Mo and NH4VO3 plays a vital role in the anisotropic growth of nanowires. The photoluminescence measurement demonstrates that these nanowires exhibit two strong emission peaks at 420 and 438 nm, which are probably related to the intrinsic oxygen vacancies.
    No preview · Article · Apr 2007 · The Journal of Physical Chemistry C
  • Jianbo Liang · Sha Bai · Yansheng Zhang · Ming Li · Weichao Yu · Yitai Qian
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    ABSTRACT: ZnO 3D hierarchical architectures with hexagonal shape and uniform size have been successfully synthesized with the assistance of sodium malate by a simple hydrothermal process. Scanning electron microscopy (SEM) images show that the hexagonal particles are composed of platelet-like nanoparticles that are orderly arranged to multilayer stacks. High-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) analysis indicate that these nanoplatelets are single-crystal and grow perpendicularly to the c-axis of wurtzite ZnO. Nitrogen adsorption−desorption measurements reveal that the specific surface area of the sample can reach to 25 m2·g-1, which is as high as that of 16 nm sized ZnO nanorods (aspect ratio of 1.6:1). The pore size distribution curve suggests the specific surface area improvement is due to the existence of small pores embedded in the 3D architectures. These small pores are attributed to the small gaps between these nanoplatelets. Malate ions have been found to play a key role in the formation of the porous 3D architectures. Room temperature photoluminescence measurements show that the porous architectures prepared in the presence of malate indeed exhibit intense ultraviolet exciton emission centered at 387 nm. The defects related yellow and green emissions have been greatly quenched, suggesting the sample is in high crystalline quality though it possesses porous characteristics.
    No preview · Article · Dec 2006 · The Journal of Physical Chemistry C
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    ABSTRACT: A large number of CdSe nanorod-assembled microtubes are prepared via a hydrothermal method in an ethanolamine-PEG solution. The tubes with inner diameters of 900 nm and lengths of 5-50 mu m are composed of well-aligned nanorods around 300-nm long. It was found that both the solvent ethanolamine and surfactant PEG-20000 play a key role in the formation of nanorod-assembled microtubes. Ethanolamine as a mild reducing agent was used to reduce SeO2 to produce Se2-. The optimal conditions to produce CdSe microtubes are that the volume ratio of ethanolamine to water is 1:4 and that the quantity of PEG is 3.0g. The possible formation mechanism of CdSe microtubes is also discussed.
    Full-text · Article · Nov 2006 · Chemistry Letters
  • Qin Xie · Jianwei Liu · Jianbo Liang · Weichao Yu · Yitai Qian
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    ABSTRACT: This article describes a polymer-controlled chemical method for synthesis of trigonal selenium (t-Se) nanowire bundles in the presence of poly(vinyl alcohol) (PVA) at 100 degrees C. Electron microscope images show that Se nanowires have diameters of 30-50 nm and lengths of up to a few tens of micrometers. TEM images display the direct evidence for the growth process of single-crystalline Se nanowire bundles, which suggested that Se nanowire bundles were directly converted from the initial amorphous Se micro-particles in the presence of PVA. UV-Vis absorbance of t-Se nanowire bundles revealed that the bandgap and absorbance peaks displayed larger blue shifts relative to those of bulk t-Se.
    No preview · Article · Apr 2006 · Journal of Nanoscience and Nanotechnology
  • Changlong Jiang · Jianbo Liang · Yitai Qian
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    ABSTRACT: This chapter discusses the solution route to semiconducting nanomaterials. Semiconducting nanomaterials are important because their physical properties are different from others because of the quantum-size effect. They provide opportunities to study the effect of spatial confinement and problems related to surfaces or interfaces, which is important for chemistry. Nanomaterials such as nanowires, nanobelts, nanorods, and 1D nanotubes have become the focus of intensive research because of their potential applications in electronic, opto-electronic, electrochemical, electromechanical, and other fields. This chapter explores the recent advances in the solution synthesis, characterization, and applications of semiconducting nanomaterials. It also reviews the solvothermal route to semiconducting nanocrystals. The chapter introduces the mixed solvothermal preparation of the semiconductors. Moreover, it evaluates the hydrothermal synthesis method and introduces the synthesis of nanocrystals in organic solvents, including multi-amine and benzene. The chapter illustrates iodine-transportation method as an effective strategy in syntheses of peculiar compounds such as cubic GaN. The chapter concludes by illustrating other solution based chemical preparation of semiconducting nanocrystallines, including sonochemical method, irradiation synthesis, refluxing, and room temperature route.
    No preview · Article · Jan 2006
  • Shaomin Ou · Qin Xie · Dekun Ma · Jianbo Liang · Xiaokai Hu · Weichao Yu · Yitai Qian
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    ABSTRACT: Large-scale copper sulfide polycrystalline nanorods have been solvothermally synthesized through a Cu(acac)2 precursor decomposition and reaction route. X-ray diffraction (XRD) showed that the product was hexagonal phase CuS with lattice constants of a = 3.795 Å and c = 16.42 Å. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) investigated the morphology of the product under the different growth conditions. PL spectra indicated that the rod-shaped product had emission peaks at 414 and 437.5 nm when the excitation wavelength was 371.5 nm, but the CuS dendrite did not demonstrate emission peaks at the same condition. A mechanism of Cu(acac)2 micronrods decomposition and reaction with CS2 in situ was suggested based on the TEM observation.
    No preview · Article · Dec 2005 · Materials Chemistry and Physics
  • Qin Xie · Zhou Dai · Jianbo Liang · Liqiang Xu · Weichao Yu · Yitai Qian
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    ABSTRACT: Uniform ZnO urchin-like architectures were synthesized by hydrothermal decomposing Zn(OH)42− precursor with the assistance of dodecylamine (DDA) at 180°C for 12h. FESEM images display that the ZnO 3D urchin-like architectures are constructed of well-aligned ZnO nanorods with diameters of 50–80nm and lengths up to 2μm. Room temperature photoluminescence spectra of ZnO 3D architectures show an intensive ultraviolet emission at ∼385nm and weak green emission, which indicated their high structural and optical quality.
    No preview · Article · Nov 2005 · Solid State Communications
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    ABSTRACT: Nanobelts of hexagonal close-packed cobalt have been synthesized by a hydrothermal reduction process at 160 °C. The as-synthesized nanobelts, with a rectangular cross section, are 200–500 nm in diameter, 50–80 nm in thickness and a few hundreds of micrometres in length. The Co nanobelts are single crystalline and grow preferentially along the [001] direction. Furthermore, the coexisting nanosheets with zigzag edges are 2–4 µm in diameter and several tens of nanometres in thickness. The hysteresis loop at room temperature of the as-obtained product shows a ferromagnetic behaviour. In addition, some influential factors as regards the morphologies of the final products were also discussed.
    No preview · Article · Oct 2005 · Nanotechnology
  • Dan Xu · Zhaoping Liu · Jianbo Liang · Yitai Qian
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    ABSTRACT: CdS nanowires with an average diameter of 25 nm and lengths of 20-40 mum have been solvothermally synthesized in a mixed solvent of ethylenediamine and dodecanethiol at 180 degrees C. The time-dependent examinations reveal that the formation process of CdS nanowires involves two sequential processes: a short-period solid-solid transformation process in the initial stage and a long-period Ostwald ripening process. The effect of both the volume ratios between the two components of the solvent and the reaction temperatures on the nanowire growth has also been investigated in detail. The results of the photoluminescence and UV-vis spectroscopy measurements reveal that the as-prepared CdS nanowires show a quantum confinement effect.
    No preview · Article · Sep 2005 · The Journal of Physical Chemistry B
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    ABSTRACT: We demonstrate a facile solution-phase method for the synthesis of single-crystal, high aspect ratio, and ultrathin nanowires of hexagonal-phase Cu2S by thermal decomposition of CuS2CNEt2 in a mixed surfactant solvent of dodecanethiol and oleic acid at 160 degrees C. Cu2S nanowires can be controllably synthesized with a diameter as thin as 1.7 nm and length up to tens of micrometers; they are usually aligned in the form of bundles with a thickness of hundreds of nanometers. Based on the experimental results, the formation mechanism of the ultrathin nanowires has been properly proposed. Some key synthetic parameters, which have a significant effect on the sizes and shapes of the products, have also been investigated in detail. UV-vis spectroscopy measurement reveals that the resultant ultrathin nanowires show a strong quantum size effect.
    No preview · Article · Jul 2005 · The Journal of Physical Chemistry B
  • Jianbo Liang · Jianwei Liu · Qin Xie · Sha Bai · Weichao Yu · Yitai Qian
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    ABSTRACT: Doughnut-shaped ZnO microparticles have been grown through a hydrothermal reaction in citrate solution at 120 degrees C. FESEM reveals that these microparticles consist of regular arranged nanoplates, and there is a concave on the surface of each microparticle. The existence of citrate is vital to the formation of the complex microparticles. Room temperature photoluminescence measurements show strong UV band emission. The yellow and green emissions related to the structure defects can be barely observed, indicating the high crystalline perfection of these microparticles.
    No preview · Article · Jun 2005 · The Journal of Physical Chemistry B
  • Zhaoping Liu · Dan Xu · Jianbo Liang · Wanjuan Lin · Weichao Yu · Yitai Qian
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    ABSTRACT: A low-temperature solution-phase method has been demonstrated for the synthesis of uniform nanorods of Bi2S3 with diameter of 18nm and length of below 200nm. Transmission electron microscopy (TEM), selected-area electron diffraction (SAED), and X-ray diffraction (XRD) studies revealed that these nanorods were grown from a colloidal dispersion of amorphous Bi2S3 particles, which was first formed through a thermal reaction between Bi-thiol complexes Bi(SC12)3 and thioacetamide (TAA) in a pure dodecanethiol (C12SH) solvent at a temperature of 95°C. Based on these studies, the growth mechanism of Bi2S3 nanorods was properly proposed.
    No preview · Article · Mar 2005 · Journal of Solid State Chemistry
  • Zhaoping Liu · Jianbo Liang · Dan Xu · Jun Lu · Yitai Qian
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    ABSTRACT: We report a facile chemical route for the synthesis of monodisperse nanocrystals of various metal sulfides (PbS, Cu(2)S, and Ag(2)S) and their assemblies into nanocrystal superlattices (NCSs); the sulfides NCSs were precipitated by adding ethanol to nanocrystal colloids, which were obtained directly by a reaction between metal thiolate and thioacetamide in a pure dodecanethiol solvent.
    No preview · Article · Jan 2005 · Chemical Communications
  • Wu Zhang · Jianwei Liu · Zhen Huang · Dekun Ma · Jianbo Liang · Yitai Qian
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    ABSTRACT: A simple method was used to prepare carbon hollow spheres with average size of about 400 nm in diameter from metal zinc powder and ethanol. The FE-SEM and TEM images show that these carbon spheres have a ball-like and vessel-like morphology, all of which have smooth surfaces and a quite uniform diameter.
    No preview · Article · Oct 2004 · Chemistry Letters
  • Zhaoping Liu · Jianbo Liang · Shu Li · Sheng Peng · Yitai Qian
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    ABSTRACT: This article describes a facile solvothermal method by using mixed solvents for the large-scale synthesis of Bi(2)S(3) nanoribbons with lengths of up to several millimeters. These nanoribbons were formed by a solvothermal reaction between Bi(III)-glycerol complexes and various sulfur sources in a mixed solution of aqueous NaOH and glycerol. HRTEM (high-resolution transmission electron microscopy) and SAED (selective-area electron diffraction) studies show that the as-synthesized nanoribbons had predominately grown along the [001] direction. The Bi(2)S(3) nanoribbons prepared by the use of different sulfur sources have a common formation process: the initial formation of NaBiS(2) polycrystals, which serve as the precursors to Bi(2)S(3), the decomposition of NaBiS(2), and the formation of Bi(2)S(3) seeds in the solution through a homogeneous nucleation process; the growth of Bi(2)S(3) nanoribbons occurs at the expense of NaBiS(2) materials. The growth mechanism of millimeter-scale nanoribbons involves a special solid-solution-solid transformation as well as an Ostwald ripening process. Some crucial factors affect nanoribbon growth, such as, solvothermal temperature, volume ratio of glycerol to water, and the concentration of NaOH; these have also been discussed.
    No preview · Article · Feb 2004 · Chemistry - A European Journal
  • Zhaoping Liu · Zhaokang Hu · Jianbo Liang · Shu Li · You Yang · Sheng Peng · Yitai Qian
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    ABSTRACT: This article describes a surfactant-assisted approach to the size-controlled synthesis of uniform nanorods of trigonal tellurium (t-Te). These nanorods were grown from a colloidal dispersion of amorphous Te (a-Te) and t-Te nanoparticles at room temperature, which was first formed through the reduction of (NH4)2TeS4 by Na2SO3 in aqueous solution at 80 degrees C. Nuclei formed in the reduction process had a strong tendency to grow along the [001] direction due to the inherently anisotropic structure of t-Te. The formation of Te nanorods could be ascribed to the confined growth through the surfactant adsorbing on the surfaces of the growing Te particles. By employing various surfactants in the synthesis system, Te nanorods with well-controlled diameters and lengths could be reproducibly produced by this method. Both the diameters and lengths of nanorods decreased with the increase of the alkyl length and the polarity of the surfactants. Te nanorods could also be obtained in mixed surfactants, where the different surfactants were used to selectively control the growth rates of different crystal planes. We also observed that the as-synthesized nanorods with uniform size could be self-assembled into large-area smecticlike arrays.
    No preview · Article · Feb 2004 · Langmuir
  • Zhaoping Liu · Shu Li · You Yang · Zhaokang Hu · Sheng Peng · Jianbo Liang · Yitai Qian
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    ABSTRACT: Single crystalline one-dimensional (1D) nanostructures of trigonal tellurium (t-Te) with well-controlled shapes and sizes were synthesized by the hydrothermal reduction of Na2TeO3 in a mixed solution of ethanol and water at 100°C. The formation of various 1D nanostructures of t-Te was mainly determined by properly controlling the nucleation and growth rate of t-Te in different reaction media. In acidic solution (1 M of HCl), the reaction gave nanowires with diameters of 30–100 nm, while in alkaline solution (1 M of NaOH), it yielded tubular crystals with diameters of 1–2 μm. The diameters of tubular crystals could also be controlled by adjusting the NaOH concentration. When polymer surfactant poly(vinyl pyrrolidone) (PVP) was presented in the alkaline solution, the reaction would produce uniform nanowires with diameters of 25 nm. Based on the TEM and SEM studies, the formation mechanisms for these 1D nanostructures were rationally interpreted. The crystallinity of the nanowires and the tubular crystals were determined by HRTEM, ED, and XRD.
    No preview · Article · Dec 2003 · New Journal of Chemistry
  • Zhaoping Liu · You Yang · Jianbo Liang · Zhaokang Hu · Shu Li · Sheng Peng · Yitai Qian
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    ABSTRACT: This paper describes a simple complex-surfactant-assisted hydrothermal reduction approach to the facile synthesis of metal copper nanowires with average diameters of ∼85 nm and lengths of several tens of micrometers. These copper nanowires were formed through the reduction of the Cu II-glycerol complexes (Cu(C3H5O3)) by phosphite (HPO32-) in the presence of surfactant sodium dodecyl benzenesulfonate (SDBS) at 120 °C. High-resolution transmission electron microscopy (HRTEM) and selected-area electron diffraction (SAED) indicate that the resulted nanowires had preferred [110] growth direction. The formation mechanism for Cu nanowires had been properly proposed. Some influencing factors on the morphologies of the final products had also been discussed.
    No preview · Article · Nov 2003 · The Journal of Physical Chemistry B