Through the use of a simple, efficient and low cost technique involving a focused laser beam, two NUS research teams, led by Professor
Said Prof Sow, "In our childhood, most of us are likely to have the experience of bringing a magnifying glass outdoors on a sunny day and tried to focus sunlight onto a piece of paper to burn the paper. Such a simple approach turns out to be a very versatile tool in research. Instead of focusing sunlight, we can focus laser beam onto a wide variety of nanomaterials and study effects of the focused laser beam has on these materials."
Micropatterns 'drawn' on MoS2 films could enhance electrical conductivity and photoconductivity
Molybdenum disulfide (MoS2), a class of transition metal dichalcogenide compound, has attracted great attention as an emerging two-dimensional (2D) material due to wide recognition of its potential in and optoelectronics. One of the many fascinating properties of 2D MoS2 film is that its properties depend on the thickness of the film. In addition, its properties can be modified once the film is modified chemically. Hence one of the challenges in this field is the ability to create microdevices out of the MoS2 film comprising components with different thickness or chemical nature.
To address this technological challenge, Prof Sow, Dr Lu Junpeng, a postdoctoral candidate from the
With this simple and low cost approach, the scientists were able to use the focused laser beam to selectively 'draw' patterns onto any region of the film to modify properties of the desired area, unlike other current methods where the entire film is modified.
Interestingly, they also found that the electrical conductivity and photoconductivity of the modified material had increased by more than 10 times and about five times respectively. The research team fabricated a photodetector using laser modified MoS2 film and demonstrated the superior performance of MoS2 for such application.
This innovation was first published online in the journal ACS Nano on
Hidden images 'drawn' by focused laser beam on silicon nanowires could improve optical functionalities
In a related study published in the journal Scientific Reports on
The team scanned a focused laser beam rapidly onto an array of mesoporous silicon nanowires, which are closely packed like the tightly woven threads of a carpet. They found that the focused laser beam could modify the optical properties of the nanowires, causing them to emit greenish-blue fluorescence light. This is the first observation of such a laser-modified behaviour from the mesoporous silicon nanowires to be reported.
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