Microsteganography on WS2 Monolayers Tailored by Direct Laser Painting

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• 作者：Ashwin Venkatakrishnan ; Hou Chua ; Pinxi Tan ; Zhenliang Hu ; Hongwei Liu ; Yanpeng Liu ; Alexandra Carvalho ; Junpeng Lu ; Chorng Haur Sow
• 刊名：ACS Nano
• 出版年：2017
• 出版时间：January 24, 2017
• 年：2017
• 卷：11
• 期：1
• 页码：713-720
• 全文大小：480K
• ISSN：1936-086X

文摘

We present scanning focused laser beam as a multipurpose tool to engineer the physical and chemical properties of WS<sub>2sub> microflakes. For monolayers, the laser modification integrates oxygen into the WS<sub>2sub> microflake, resulting in ∼9 times enhancement in the intensity of the fluorescence emission. This modification does not cause any morphology change, allowing “micro-encryption” of information that is only observable as fluorescence under excitation. The same focused laser also facilitates on demand thinning down of WS<sub>2sub> multilayers into monolayers, turning them into fluorescence active components. With a scanning focused laser beam, micropatterns are readily created on WS<sub>2sub> multilayers through selective thinning of specific regions on the flake.