Fengrui Yao

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2D layered nanomaterials with strong covalent bonding within layers and weak van der Waals' interactions between layers have attracted tremendous interest in recent years. Layered Bi2 Se3 is a representative topological insulator material in this family, which holds promise for exploration of the fundamental physics and practical applications such as(More)
Direct visualization of one-dimensional (1D) materials under an optical microscope in ambient conditions is of great significance for their characterizations and applications. However, it is full of challenges to achieve such goal due to their relative small size (ca. 1 nm in diameter) in the optical-diffraction-limited laser spot (ca. 1 μm in diameter). In(More)
By designing a few-layer boron nitried (BN) buffer layer, topological crystalline insulator Pb(1-x)Sn(x)Se nanoplates are directly grown on SiO2/Si, which shows high compatibility with current Si-based integrated circuit technology. Back-gated field-effect transistors of Pb(1-x)Sn(x)Se nanoplates exhibit a room-temperature carrier mobility of 0.73-4.90(More)
A vertical point heterostructure (VPH) is constructed by sandwiching a two-dimensional (2D) MoS2 flake with two cross-stacked metallic single-walled carbon nanotubes. It can be used as a field-effect transistor with high on/off ratio and a light detector with high spatial resolution. Moreover, the hybrid 1D-2D-1D VPHs open up new possibilities for(More)
Controllable synthesis of carbon nanotubes (CNTs) is of great importance in its further application, which attracts broad attention. As growth and etching are the two sides in the process of material crystallography and the control of the competition between them forms the foundation for modern technology of materials design and manufacture, the(More)
Optical multicolor imaging is used as a high-throughput statistical tool to determine the structure information of horizontally aligned carbon nanotube arrays on various substrates and in diverse environments. This high-throughput ability is achieved through the direct use of optical image information and an over 10-fold enhancement of the optical contrast(More)
Ultrafast electron pulses, combined with laser-pump and electron-probe technologies, allow ultrafast dynamics to be characterized in materials. However, the pursuit of simultaneous ultimate spatial and temporal resolution of microscopy and spectroscopy is largely subdued by the low monochromaticity of the electron pulses and their poor phase synchronization(More)
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