Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/102260
Title: Mechanical exfoliation and characterization of single- and few-layer nanosheets of WSe2, TaS2, and TaSe2
Authors: Li, Hai
Lu, Gang
Wang, Yanlong
Yin, Zongyou
Cong, Chunxiao
He, Qiyuan
Wang, Lu
Ding, Feng
Yu, Ting
Zhang, Hua
Keywords: DRNTU::Engineering::Materials
Issue Date: 2013
Source: Li, H., Lu, G., Wang, Y., Yin, Z., Cong, C., He, Q., et al. (2013). Mechanical exfoliation and characterization of single- and few-layer nanosheets of WSe2, TaS2, and TaSe2. Small, 9(11), 1974-1981.
Series/Report no.: Small
Abstract: Single- and few-layer transition-metal dichalcogenide nanosheets, such as WSe2, TaS2, and TaSe2, are prepared by mechanical exfoliation. A Raman microscope is employed to characterize the single-layer (1L) to quinary-layer (5L) WSe2 nanosheets and WSe2 single crystals with a laser excitation power ranging from 20 μW to 5.1 mW. Typical first-order together with some second-order and combinational Raman modes are observed. A new peak at around 308 cm−1 is observed in WSe2 except for the 1L WSe2, which might arise from interlayer interactions. Red shifting of the A1g mode and the Raman peak around 308 cm−1 is observed from 1L to 5L WSe2. Interestingly, hexagonal- and monoclinic-structured WO3 thin films are obtained during the local oxidation of thinner (1L–3L) and thicker (4L and 5L) WSe2 nanosheets, while laser-burned holes are found during the local oxidation of the WSe2 single crystal. In addition, the characterization of TaS2 and TaSe2 thin layers is also conducted.
URI: https://hdl.handle.net/10356/102260
http://hdl.handle.net/10220/19029
ISSN: 1613-6810
DOI: 10.1002/smll.201202919
Rights: © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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