| Summary: | Needle-like single crystalline wires of TaSe<sub>3</sub> were massively synthesized using the chemical vapor transport method. Since the wedged-shaped single TaSe<sub>3</sub> molecular chains were stacked along the b-axis by weak van der Waals interactions, a few layers of TaSe<sub>3</sub> flakes could be easily isolated using a typical mechanical exfoliation method. The exfoliated TaSe<sub>3</sub> flakes had an anisotropic planar structure, and the number of layers could be controlled by a repeated peeling process until a monolayer of TaSe<sub>3</sub> nanoribbon was obtained. Through atomic force and scanning Kelvin probe microscope analyses, it was found that the variation in the work function with the thickness of the TaSe<sub>3</sub> flakes was due to the interlayer screening effect. We believe that our results will not only help to add a novel quasi-1D block for nanoelectronics devices based on 2D van der Waals heterostructures, but also provide crucial information for designing proper contacts in device architecture.
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