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Bolstering functionality in multilayer and bilayer WS2 via focused laser micro-engraving

Science China(Information Sciences) 2023年第6期66卷 94-101页

作者： Si Min CHAN eng Tuan POH Jin Feng LEONG kuan eng johnson goh Chorng Haur SOW Department of Physics National University of Singapore Institute of Materials Research and engineering Agency for ScienceTechnology and Research (A~*STAR) Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological University

Laser thinning of multilayer transition metal dichalcogenide(TMD)crystals has long been explored for its potential to produce localized domains of optically functional monolayers. Despite the high spatial control and resolution of the laser, the range of appropriate applications for these laser-thinned domains is still limited by the peripheral regions of unaltered thick multilayers. Herein, we report a newfound property of the laser-thinned regions to adhere strongly to the underlying substrate when lasered down to the monolayer limit. Upon a brief sonication in various solvents, the surrounding pristine multilayers can be lifted off, solely leaving behind the post-lasered monolayer patterns. Coupled with the flexible maneuver of the laser, various monolayer designs can be achieved, including micro-antenna, waveguide, and electrode geometries with lateral line widths at 1.5 μm resolution. Furthermore, we also detail the optical properties of the monolayers obtained from laser thinning, with those acquired from multilayers containing more defectbound excitons, whereas those lasered from bilayers presenting a trion-dominated profile similar to as-grown monolayers. Together, these findings allow for faster and more efficient multilayer removal and areal shaping of optically active monolayer domains, in comparison to multistep and complex standard lithographic etching(lithography–etch–develop)procedures.

关键词： WS$_2$ monolayer micro-patterning focused laser sonication lift-off

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Detecting MoS2 and MoSe2 with optical contrast simulation

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Progress in Natural Science:Materials International 2019年第6期29卷 667-671页

作者： Xiaohe Zhang Hiroyo Kawai Jing Yang kuan eng johnson goh Victoria Junior College Institute of Materials Research and engineering A*STAR (Agency for Science Technology and Research) Department of Physics Faculty of Science National University of Singapore

Optical imaging is a promising method to identify and locate 2D materials efficiently and non-invasively. By putting a 2D material on a substrate, the nanolayer will add to an optical path and create a contrast to the case when the nanolayer is absent. This optical contrast imaging can be used to identify the 2D material and its number of layers. To make the optical imaging process in the laboratories an effective tool, Fresnel Law as a model was used to simulate the optical imaging results of 2D materials(graphene, Mo S2 and MoSe2) on top of different thickness of SiO2and Si wafer in the present investigation. The results provide the details of the optimal conditions(optimal light wavelength and optimal SiO2thickness) to identify and locate single to few 2D nanolayers, which can be used directly in laboratories. The optical contrasts of 1–5 layers of molybdenum disulfide(MoS2) and molybdenum diselenide(MoSe2) were simulated. To the best of our knowledge, it is the first time that the optical contrast results of MoSe2have been reported. In particular, this work highlights the sensitivity of the model on the accuracy of the refractive indices used. It is demonstrated that through computational modeling that optical contrast can allow effective determination of number of layers in few layer 2D materials.

关键词： 2D materials Optical imaging Substrate Fresnel law

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Emergence of photoluminescence on bulk MoS2 by laser thinning and gold particle decoration

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Nano Research 2018年第9期11卷 4574-4586页

作者： Lili Gong Qi Zhang Liangjun Wang Jianfeng Wu Cheng Han Bo Lei Wei Chen Goki Eda kuan eng johnson goh Chorng Haur Sow Department of Physics National University of Singapore Singapore 117542 Singapore Department of Chemistry National University of Singapore Singapore 117542 Singapore Centre for Advanced 2D Materials and Graphene Research Centre National University of Singapore 6 Science Drive 2 Singapore 117546 Singapore Institute of Materials Research and engineering Agency for Science Technology and Research (A＊STAR) 2 Fusionopolis Way Innovis #08-03 Singapore 138634 Singapore

We demonstrate a facile and effective approach to significantly improve the photoluminescence of bulk MoS2 via laser thinning followed by gold particle decoration. Upon laser thinning of exfoliated bulk MoSz photoluminescence emerges from the laser-thinned region. After further treatment with an AuCl3 solution, gold particles self-assemble on the laser-thinned region and thick edges, further increasing the fluorescence of bulk MoS2 28 times and the Raman response 3 times. Such fluorescence enhancement can be attributed to both surface plasmon resonance and p-type doping induced by gold particles. The combination of laser thinning and AuCl3 treatment enables the functionalization of bulk MoS2 for optoelectronic applications. It can also provide a viable strategy for mask-free and area-selective p-type doping on single MoS2 flakes.

关键词： bulk MoS photoluminescence laser thinning gold particle plasmonic effect doping

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