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Enhancing charge transfer with foreign molecules through femtosecond laser induced MoS2 defect sites for photoluminescence control and SERS enhancement
- Source :
- Nanoscale. 11:485-494
- Publication Year :
- 2019
- Publisher :
- Royal Society of Chemistry (RSC), 2019.
-
Abstract
- Defect/active site control is crucial for tuning the chemical, optical, and electronic properties of MoS2, which can adjust the performance of MoS2 in application areas such as electronics, optics, catalysis, and molecular sensing. This study presents an effective method of inducing defect/active sites, including micro/nanofractured structures and S atomic vacancies, on monolayer MoS2 flakes by using femtosecond laser pulses, through which physical–chemical adsorption and charge transfer between foreign molecules (O2 or R6G molecules) and MoS2 are enhanced. The enhanced charge transfer between foreign molecules (O2 or R6G) and femtosecond laser-treated MoS2 can enhance the electronic doping effect between them, hence resulting in a photoluminescence photon energy shift (reaching 0.05 eV) of MoS2 and Raman enhancement (reaching 6.4 times) on MoS2 flakes for R6G molecule detection. Finally, photoluminescence control and micropatterns on MoS2 and surface-enhanced-Raman-scattering (SERS) enhancement of MoS2 for organic molecule detection are achieved. The proposed method, which can control the photoluminescence properties and arbitrary micropatterns on MoS2 and enhance its chemicobiological sensing performance for organic/biological molecules, has advantages of simplicity, maskless processing, strong controllability, high precision, and high flexibility, highlighting the superior ability of femtosecond laser pulses to achieve the property control and functionalization of two-dimensional materials.
- Subjects :
- chemistry.chemical_classification
Photoluminescence
Materials science
business.industry
Biomolecule
Doping
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Laser
01 natural sciences
0104 chemical sciences
law.invention
symbols.namesake
chemistry
law
Femtosecond
Monolayer
symbols
Optoelectronics
Molecule
General Materials Science
0210 nano-technology
Raman spectroscopy
business
Subjects
Details
- ISSN :
- 20403372 and 20403364
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Nanoscale
- Accession number :
- edsair.doi...........9193ba07fa25d812d04e05ab30ecde6f