Microsteganography on WS<sub>2</sub> Monolayers Tailored by Direct Laser Painting.
basic_science · Level V
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- Record sourced from PubMed, PMID 28033460.
- Also identified by DOI 10.1021/acsnano.6b07118.
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Abstract
We present scanning focused laser beam as a multipurpose tool to engineer the physical and chemical properties of WS<sub>2</sub> microflakes. For monolayers, the laser modification integrates oxygen into the WS<sub>2</sub> 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>2</sub> multilayers into monolayers, turning them into fluorescence active components. With a scanning focused laser beam, micropatterns are readily created on WS<sub>2</sub> multilayers through selective thinning of specific regions on the flake.