Selective CW Laser Synthesis of MoS<sub>2</sub> and Mixture of MoS<sub>2</sub> and MoO<sub>2</sub> from (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> Film
Very recently, the synthesis of 2D MoS<sub>2</sub> and WS<sub>2</sub> through pulsed laser-directed thermolysis can achieve wafer-scale and large-area structures, in ambient conditions. In this paper, we report the synthesis of MoS<sub>2</sub> and MoS<sub>2&...
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| Format: | Article |
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MDPI AG
2024-02-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/15/2/258 |
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| author | Noah Hurley Bhojraj Bhandari Steve Kamau Roberto Gonzalez Rodriguez Brian Squires Anupama B. Kaul Jingbiao Cui Yuankun Lin |
| author_facet | Noah Hurley Bhojraj Bhandari Steve Kamau Roberto Gonzalez Rodriguez Brian Squires Anupama B. Kaul Jingbiao Cui Yuankun Lin |
| author_sort | Noah Hurley |
| collection | DOAJ |
| description | Very recently, the synthesis of 2D MoS<sub>2</sub> and WS<sub>2</sub> through pulsed laser-directed thermolysis can achieve wafer-scale and large-area structures, in ambient conditions. In this paper, we report the synthesis of MoS<sub>2</sub> and MoS<sub>2</sub> oxides from (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> film using a visible continuous-wave (CW) laser at 532 nm, instead of the infrared pulsed laser for the laser-directed thermolysis. The (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> film is prepared by dissolving its crystal powder in DI water, sonicating the solution, and dip-coating onto a glass slide. We observed a laser intensity threshold for the laser synthesis of MoS<sub>2</sub>, however, it occurred in a narrow laser intensity range. Above that range, a mixture of MoS<sub>2</sub> and MoO<sub>2</sub> is formed, which can be used for a memristor device, as demonstrated by other research groups. We did not observe a mixture of MoS<sub>2</sub> and MoO<sub>3</sub> in the laser thermolysis of (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub>. The laser synthesis of MoS<sub>2</sub> in a line pattern is also achieved through laser scanning. Due to of the ease of CW beam steering and the fine control of laser intensities, this study can lead toward the CW laser-directed thermolysis of (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> film for the fast, non-vacuum, patternable, and wafer-scale synthesis of 2D MoS<sub>2</sub>. |
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| id | doaj.art-4d8a45c89cf54a80b8efd52ba25de89c |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-07T22:20:44Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-4d8a45c89cf54a80b8efd52ba25de89c2024-02-23T15:27:49ZengMDPI AGMicromachines2072-666X2024-02-0115225810.3390/mi15020258Selective CW Laser Synthesis of MoS<sub>2</sub> and Mixture of MoS<sub>2</sub> and MoO<sub>2</sub> from (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> FilmNoah Hurley0Bhojraj Bhandari1Steve Kamau2Roberto Gonzalez Rodriguez3Brian Squires4Anupama B. Kaul5Jingbiao Cui6Yuankun Lin7Department of Physics, University of North Texas, Denton, TX 76203, USADepartment of Physics, University of North Texas, Denton, TX 76203, USADepartment of Physics, University of North Texas, Denton, TX 76203, USADepartment of Physics, University of North Texas, Denton, TX 76203, USADepartment of Physics, University of North Texas, Denton, TX 76203, USADepartment of Materials Science and Engineering, University of North Texas, Denton, TX 76203, USADepartment of Physics, University of North Texas, Denton, TX 76203, USADepartment of Physics, University of North Texas, Denton, TX 76203, USAVery recently, the synthesis of 2D MoS<sub>2</sub> and WS<sub>2</sub> through pulsed laser-directed thermolysis can achieve wafer-scale and large-area structures, in ambient conditions. In this paper, we report the synthesis of MoS<sub>2</sub> and MoS<sub>2</sub> oxides from (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> film using a visible continuous-wave (CW) laser at 532 nm, instead of the infrared pulsed laser for the laser-directed thermolysis. The (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> film is prepared by dissolving its crystal powder in DI water, sonicating the solution, and dip-coating onto a glass slide. We observed a laser intensity threshold for the laser synthesis of MoS<sub>2</sub>, however, it occurred in a narrow laser intensity range. Above that range, a mixture of MoS<sub>2</sub> and MoO<sub>2</sub> is formed, which can be used for a memristor device, as demonstrated by other research groups. We did not observe a mixture of MoS<sub>2</sub> and MoO<sub>3</sub> in the laser thermolysis of (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub>. The laser synthesis of MoS<sub>2</sub> in a line pattern is also achieved through laser scanning. Due to of the ease of CW beam steering and the fine control of laser intensities, this study can lead toward the CW laser-directed thermolysis of (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> film for the fast, non-vacuum, patternable, and wafer-scale synthesis of 2D MoS<sub>2</sub>.https://www.mdpi.com/2072-666X/15/2/258laser material processingMoS<sub>2</sub>(NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub>laser synthesislaser direct writinglaser-directed thermolysis |
| spellingShingle | Noah Hurley Bhojraj Bhandari Steve Kamau Roberto Gonzalez Rodriguez Brian Squires Anupama B. Kaul Jingbiao Cui Yuankun Lin Selective CW Laser Synthesis of MoS<sub>2</sub> and Mixture of MoS<sub>2</sub> and MoO<sub>2</sub> from (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> Film Micromachines laser material processing MoS<sub>2</sub> (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> laser synthesis laser direct writing laser-directed thermolysis |
| title | Selective CW Laser Synthesis of MoS<sub>2</sub> and Mixture of MoS<sub>2</sub> and MoO<sub>2</sub> from (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> Film |
| title_full | Selective CW Laser Synthesis of MoS<sub>2</sub> and Mixture of MoS<sub>2</sub> and MoO<sub>2</sub> from (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> Film |
| title_fullStr | Selective CW Laser Synthesis of MoS<sub>2</sub> and Mixture of MoS<sub>2</sub> and MoO<sub>2</sub> from (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> Film |
| title_full_unstemmed | Selective CW Laser Synthesis of MoS<sub>2</sub> and Mixture of MoS<sub>2</sub> and MoO<sub>2</sub> from (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> Film |
| title_short | Selective CW Laser Synthesis of MoS<sub>2</sub> and Mixture of MoS<sub>2</sub> and MoO<sub>2</sub> from (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> Film |
| title_sort | selective cw laser synthesis of mos sub 2 sub and mixture of mos sub 2 sub and moo sub 2 sub from nh sub 4 sub sub 2 sub mos sub 4 sub film |
| topic | laser material processing MoS<sub>2</sub> (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> laser synthesis laser direct writing laser-directed thermolysis |
| url | https://www.mdpi.com/2072-666X/15/2/258 |
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