Baodan Liu

Publications (32)167.16 Total impact

• Article: Solid-solution semiconductor nanowires in pseudobinary systems.

  Baodan Liu, Yoshio Bando, Lizhao Liu, Jijun Zhao, Masanori Mitome, Xin Jiang, Dmitri Golberg
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  ABSTRACT: Pseudobinary solid-solution semiconductor nanowires made of (GaP)1-x(ZnS)x, (ZnS)1-x(GaP)x and (GaN)1-x(ZnO)x were synthesized based on an elaborative compositional, structural and synthetic designs. Using analytical high-resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray spectroscopy (EDS), we confirm that the structure uniformity and a lattice match between the two constituting binary components play the key roles in the formation of quaternary nano-solid-solution nanostructures. Electrical transport measurements on individual GaP and (GaP)1-x(ZnS)x nanowires indicated that a slight invasion of ZnS in the GaP host can lead to the abrupt resistance increase, resulting in the semiconductor-to-insulator transition. The method proposed here may be extended to the rational synthesis of many other multi-component nanosystems with tunable and intriguing optoelectronic properties, and specific applications.
  Nano Letters 12/2012; · 13.20 Impact Factor
• Article: Nanomaterial engineering and property studies in a transmission electron microscope.

  Dmitri Golberg, Pedro M F J Costa, Ming-Sheng Wang, Xianlong Wei, Dai-Ming Tang, Zhi Xu, Yang Huang, Ujjal K Gautam, Baodan Liu, Haibo Zeng, Naoyki Kawamoto, Chunyi Zhi, Masanori Mitome, Yoshio Bando
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  ABSTRACT: Modern methods of in situ transmission electron microscopy (TEM) allow one to not only manipulate with a nanoscale object at the nanometer-range precision but also to get deep insights into its physical and chemical statuses. Dedicated TEM holders combining the capabilities of a conventional high-resolution TEM instrument and atomic force -, and/or scanning tunneling microscopy probes become the powerful tools in nanomaterials analysis. This progress report highlights the past, present and future of these exciting methods based on the extensive authors endeavors over the last five years. The objects of interest are diverse. They include carbon, boron nitride and other inorganic one- and two-dimensional nanoscale materials, e.g., nanotubes, nanowires and nanosheets. The key point of all experiments discussed is that the mechanical and electrical transport data are acquired on an individual nanostructure level under ultimately high spatial, temporal and energy resolution achievable in TEM, and thus can directly be linked to morphological, structural and chemical peculiarities of a given nanomaterial.
  Advanced Materials 01/2012; 24(2):177-94. · 13.88 Impact Factor
• Article: TiO2 nanotubes with tube-in-tube porous walls: fabrication, formation mechanism and photocatalytic properties

  Xijin Xu, Xiaosheng Fang, Yoshio Bando, Tianyou Zhai, Haibo Zeng, Baodan Liu, Xiaoye Hu, Dmitri Golberg
  Small 04/2011; · 8.35 Impact Factor
• Article: Nanotubes: Tube-in-Tube TiO(2) Nanotubes with Porous Walls: Fabrication, Formation Mechanism, and Photocatalytic Properties (Small 4/2011).

  Xijin Xu, Xiaosheng Fang, Tianyou Zhai, Haibo Zeng, Baodan Liu, Xiaoye Hu, Yoshio Bando, Dmitri Golberg
  Small 02/2011; 7(4):444. · 8.35 Impact Factor
• Article: Tube-in-tube TiO₂ nanotubes with porous walls: fabrication, formation mechanism, and photocatalytic properties.

  Xijin Xu, Xiaosheng Fang, Tianyou Zhai, Haibo Zeng, Baodan Liu, Xiaoye Hu, Yoshio Bando, Dmitri Golberg
  Small 02/2011; 7(4):445-9. · 8.35 Impact Factor
• Article: Self-assembled ZnS nanowire arrays: synthesis, in situ Cu doping and field emission

  Baodan Liu, Yoshio Bando, Xin Jiang, Chun Li, Xiaosheng Fang, Haibo Zeng, Takeshi Terao, Chengchun Tang, Masanori Mitome, Dmitri Golberg
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  ABSTRACT: Well-aligned single-crystalline ZnS nanowire arrays have been grown on highly conductive Cu substrates through controlling the morphology evolution of self-patterned ZnS nanoparticles. The ZnS nanowires have sharp tips with an average size of ~ 30 nm and a length of ~ 3 µm. Field emission measurements demonstrated that the aligned ZnS nanowires grown on Cu substrates are excellent field emitters having a turn-on field as low as 2.92 V µm − 1 and a field-enhancement factor as high as 3400. The use of highly conductive metal substrate may promote the commercial applications of ZnS-based emitters in flat panel displays and other optoelectronic devices.
  Nanotechnology 08/2010; 21(37):375601. · 3.98 Impact Factor
• Article: Crystallography of Novel T-Shaped ZnS Nanostructures and Their Cathodoluminescence

  Baodan Liu, Yoshio Bando, Zaien Wang, Chengyao Li, Min Gao, Masanori Mitome, Xin Jiang, Dmitri Golberg
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  ABSTRACT: Novel T-shaped ZnS nanostructures are synthesized through simple ZnS powder evaporation. High-resolution transmission electron microscopy (HRTEM) and electron diffraction (ED) analyses demonstrate that the structures are composed of a bicrystalline base sheet (010)/(102)/(010)* and a protruding thick wire. The two structural domains are connected along the twin boundary on the (102) plane. Cathodoluminescence measurements show that the T-shaped ZnS nanostructures exhibit three clear emission zones in the ranges of 380−550 nm, 550−760 nm, and 760−1000 nm, whereas the band gap emission is not observed. Finally, the related optical emission mechanism is discussed based on the TEM results.
  07/2010;
• Article: Synthesis and in-situ TEM transport measurements of individual GaN nanowires and nanotubes.

  Baodan Liu, Yoshio Bando, Mingsheng Wang, Dmitri Golberg
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  ABSTRACT: High-purity GaN nanowires and nanotubes of various morphologies and sizes have been synthesized through epitaxial growth on [001]-oriented sapphire substrates. The GaN nanowires grown on Ni catalyst particles possess an average diameter of approximately 100 nm and rather smooth surface; whereas GaN nanotubes guided by Au particles exhibit large diameters (100-500 nm) and rough surface morphology. The microstructures and crystallography of GaN nanowires and nanotubes were analyzed using a high-resolution transmission electron microscope (HRTEM). For the first time the electrical transport in individual GaN nanowires and nanotubes was in-situ measured inside the microscope. The electrical transport was mainly affected by the nanocrystal quality and nanostructure/contact interfaces.
  Journal of Nanoscience and Nanotechnology 06/2010; 10(6):3945-51. · 1.56 Impact Factor
• Source

  Available from: Benjamin Dierre

  Article: 352 nm ultraviolet emission from high-quality crystalline AlN whiskers.

  Baodan Liu, Yoshio Bando, Aimin Wu, Xin Jiang, Benjamin Dierre, Takashi Sekiguchi, Chengchun Tang, Masanori Mitome, Dmitri Golberg
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  ABSTRACT: High-quality, crystalline AlN whiskers with large yield have been synthesized through the direct nitridation of Al vapor at high temperature. The AlN whiskers exhibited a strong and uniform ultraviolet emission at approximately 352 nm, which is notably shorter compared with the wavelength of previously reported one-dimensional AlN nanostructures. Energy filtered transmission electron microscope (TEM) analyses indicated that nitrogen deficiency and rather lower oxygen content in the AlN lattice might be responsible for the strong 352 nm ultraviolet emission.
  Nanotechnology 02/2010; 21(7):75708. · 3.98 Impact Factor
• Article: Fabrication of high-quality In2Se3 nanowire arrays toward high-performance visible-light photodetectors.

  Tianyou Zhai, Xiaosheng Fang, Meiyong Liao, Xijin Xu, Liang Li, Baodan Liu, Yasuo Koide, Ying Ma, Jiannian Yao, Yoshio Bando, Dmitri Golberg
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  ABSTRACT: The synthesis of high-quality In2Se3 nanowire arrays via thermal evaporation method and the photoconductive characteristics of In2Se3 individual nanowires are first investigated. The electrical characterization of a single In2Se3 nanowire verifies an intrinsic n-type semiconductor behavior. These single-crystalline In2Se3 nanowires are then assembled in visible-light sensors which demonstrate a fast, reversible, and stable response. The high photosensitivity and quick photoresponse are attributed to the superior single-crystal quality and large surface-to-volume ratio resulting in fewer recombination barriers in nanostructures. These excellent performances clearly demonstrate the possibility of using In2Se3 nanowires in next-generation sensors and detectors for commercial, military, and space applications.
  ACS Nano 02/2010; 4(3):1596-602. · 10.77 Impact Factor
• Source

  Available from: Benjamin Dierre

  Article: The synthesis, structure and cathodoluminescence of ellipsoid-shaped ZnGa2O4 nanorods.

  Baodan Liu, Yoshio Bando, Benjamin Dierre, Takashi Sekiguchi, Chengchun Tang, Masanori Mitome, Aimin Wu, Xin Jiang, Dmitri Golberg
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  ABSTRACT: We fabricated ellipsoid-shaped ZnGa(2)O(4) nanorods using a newly-designed chemical vapor deposition (CVD) process, different from the conventional methods. The optical properties of nanorods were studied using cathodoluminescence (CL) measurements. The nanorods displayed three distinct emissions centered at 360, 450 and 550 nm. The luminescence mechanism is thoroughly discussed and explained based on a detailed structural and compositional study with a transmission electron microscope (TEM) equipped with an electron energy loss spectrometer (EELS).
  Nanotechnology 10/2009; 20(36):365705. · 3.98 Impact Factor
• Article: Electron-beam irradiation induced conductivity in ZnS nanowires as revealed by in situ transmission electron microscope

  Baodan Liu, Yoshio Bando, Mingsheng Wang, Chunyi Zhi, Xiaosheng Fang, Chengchun Tang, Masanori Mitome, Dmitri Golberg
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  ABSTRACT: Electron transport variations in individual ZnS nanowires synthesized through a chemical vapor deposition process were in situ studied in transmission electron microscope under convergent electron-beam irradiation (EBI). It was found that the transport can dramatically be enhanced using proper irradiation conditions. The conductivity mechanism was revealed based on a detailed study of microstructure and composition evolutions under irradiation. EBI-induced Zn-rich domains’ appearance and related O doping were mainly responsible for the conductivity improvements. First-principles theoretical calculations additionally indicated that the generation of midbands within a ZnS band gap might also contribute to the improved conductivity.
  Journal of Applied Physics 09/2009; · 2.17 Impact Factor
• Article: Macroporous silicon oxycarbide fibers with luffa-like superhydrophobic shells.

  Ping Lu, Qing Huang, Baodan Liu, Yoshio Bando, You-Lo Hsieh, Amiya K Mukherjee
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  ABSTRACT: High-surface-area silicon oxycarbide macroporous fibers were fabricated through in situ cross-linking of a preceramic precursor without a prepatterned template. The unique luffa-like shell combined with intrinsic silicon-containing groups accounts for the resultant superhydrophobic property. Meanwhile, the oil-uptake capacity of the corresponding fiber mat is significantly improved by the capsulated nanoparticles.
  Journal of the American Chemical Society 08/2009; 131(30):10346-7. · 9.91 Impact Factor
• Source

  Available from: Benjamin Dierre

  Article: Characterization, Cathodoluminescence, and Field‐Emission Properties of Morphology‐Tunable CdS Micro/Nanostructures

  Tianyou Zhai, Xiaosheng Fang, Yoshio Bando, Benjamin Dierre, Baodan Liu, Haibo Zeng, Xijin Xu, Yang Huang, Xiaoli Yuan, Takashi Sekiguchi, Dmitri Golberg
  Advanced Functional Materials 06/2009; 19(15):2423 - 2430. · 10.18 Impact Factor
• Article: Bicrystalline ZnS Microbelts

  Baodan Liu, Yoshio Bando, Meiyong Liao, Chengchun Tang, Masanori Mitome, Dmitri Golberg
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  ABSTRACT: Bicrystalline ZnS microbelts with unusual structures were synthesized using chemical vapor deposition while adding MnO2 into standard ZnS precursor. High-resolution transmission electron microscopy (HRTEM) and electron diffraction (ED) analyses showed that two neighboring crystals within each bicrystal are composed of (01̅2)/(103) and (010)/(103) planes with only one atomic layer of the (103) plane at the twin boundary, different from all previously reported ZnS twinned structures. UV sensors prepared from novel ZnS microbelts exhibited an ultrafast response and a decent stability under continuous UV irradiation, revealing a large promise for applications in nanoscaled UV-sensors.
  06/2009;
• Article: Template Deformation-Tailored ZnO Nanorod/Nanowire Arrays: Full Growth Control and Optimization of Field-Emission

  Haibo Zeng, Xijin Xu, Yoshio Bando, Ujjal K. Gautam, Tianyou Zhai, Xiaosheng Fang, Baodan Liu, Dmitri Golberg
  Adv. Funct. Mater. 06/2009;
• Article: Crystallography and elasticity of individual GaN nanotubes.

  Baodan Liu, Yoshio Bando, Mingsheng Wang, Chengchun Tang, Masanori Mitome, Dmitri Golberg
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  ABSTRACT: High-purity, crystalline [001]-oriented GaN nanotubes with outer diameters of 200 nm or more, rough surfaces and irregular internal channels were synthesized under epitaxial growth on [001]-oriented sapphire substrates. Elastic property measurements on free-standing individual GaN nanotubes, using the in situ transmission electron microscopy (TEM) electromechanical resonance technique, pointed at an average Young's modulus E of 37 GPa and minimum quality factor of 320. These numbers are notably lower than those for previously reported GaN nanowires. The crystallography and chemistry of the GaN nanotubes were analyzed using TEM and energy dispersion x-ray spectroscopy (EDS). It is suggested that the lowered Young's modulus and quality factor of the nanotubes are mainly due to the surface roughness and defectiveness.
  Nanotechnology 06/2009; 20(18):185705. · 3.98 Impact Factor
• Source

  Available from: Benjamin Dierre

  Article: Single‐Crystalline ZnS Nanobelts as Ultraviolet‐Light Sensors

  Xiaosheng Fang, Yoshio Bando, Meiyong Liao, Ujjal K. Gautam, Chunyi Zhi, Benjamin Dierre, Baodan Liu, Tianyou Zhai, Takashi Sekiguchi, Yasuo Koide, Dmitri Golberg
  Advanced Materials 03/2009; 21(20):2034 - 2039. · 13.88 Impact Factor
• Article: Mn−Si-Catalyzed Synthesis and Tip-End-Induced Room Temperature Ferromagnetism of SiC/SiO2 Core−Shell Heterostructures

  Baodan Liu, Yoshio Bando, Chengchun Tang, Masanori Mitome, Kazunari Yamaura, Eiji Takayama-Muromachi, Dmitri Golberg
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  ABSTRACT: SiC/SiO2 heterostructures were synthesized with catalytic Mn−Si alloy particles via a simple thermal evaporation process. The inner SiC nanowires were crystalline and possessed cubic structures with a large number of structural defects. Outer amorphous 15 nm thick layers of SiO2 were 40−100 nm in diameter. A novel peapod-like silica tubular structure encapsulating Mn−Si alloy particles was also discovered. Magnetic measurements revealed that the Mn−Si catalyzed SiC/SiO2 nanocable heterostructures exhibited tip-end-induced room temperature ferromagnetism. It is believed that the Mn atoms not only played the role of catalyst, but were also responsible for the existing ferromagnetism at the heterostructure Mn−Si-alloy tip-ends. We envisage that the present novel structures, as well as their interesting magnetic properties, should find applications in a future nanodevice design.
  11/2008;
• Article: Low-temperature growth of uniform ZnO particles with controllable ellipsoidal morphologies and characteristic luminescence patterns.

  Rongguo Xie, Dongsheng Li, Hui Zhang, Deren Yang, Minhua Jiang, Takashi Sekiguchi, Baodan Liu, Yoshi Bando
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  ABSTRACT: Uniform ellipsoidal ZnO particles have been synthesized in an aqueous solution in the presence of triethonalamine (TEA) mediated by sonication at the temperature below 80 degrees C. Scanning electron microscopy observations reveal that the ellipsoidal particles are highly uniform with a hexagonal cross-section. The morphologies of the ZnO particles can be systematically controlled from elongated rugby ball-like ellipsoidal to half-ellipsoidal by increasing the TEA concentration. Spatial resolved cathodoluminescence measurements at room temperature show that the ellipsoidal ZnO particles are intrinsically encoded with barcode-like ultraviolet luminescence patterns, which are of either a wide stripe or a narrow stripe perpendicular to the length at the core of the particles depending on the growth temperature. Moreover, the luminescence spectra of the ellipsoidal particles can be tuned by heat treatments at elevated temperatures, while maintaining the luminescence patterns. We believe that the well-defined uniform ellipsoidal ZnO particles embedded with unique luminescence characteristics hold great potential for use in bioengineering and photonics, such as biological labeling and optical probes.
  The Journal of Physical Chemistry B 11/2006; 110(39):19147-53. · 3.70 Impact Factor