An oxygen adsorption-enhanced monolayer ws 2 Fluorescence method
An oxygen adsorption, monolayer technology, applied in chemical instruments and methods, luminescent materials, inorganic chemistry, etc., can solve the problems of uneven luminescence, many structural defects, affecting the optoelectronic properties of materials, etc.
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Embodiment 1
[0085] will be grown on SiO by PVD 2 / Single-layer WS on Si substrate 2Photoluminescence scanning imaging of the two-dimensional material was carried out under a confocal microscope, and the low-temperature spectrum was measured under a 10K environment of a cryogenic microscope system, and the excitation light source was a 532 nm continuous laser. and measure a single monolayer WS using a streak camera 2 Fluorescence lifetime of the sample from edge to center with excitation wavelength of 400 nm and frequency of 1 MHz.
[0086] see the results figure 1 and figure 2 . from figure 1 It can be seen that in the atmospheric environment, at room temperature, the monolayer WS prepared on the first day 2 The edge has begun to adsorb oxygen atoms to generate fluorescence enhancement. As time goes by, the fluorescence enhancement area gradually expands to the center, and finally lights up the entire monolayer WS 2 . from figure 2 It can be seen that the fluorescence is strong...
Embodiment 2
[0088] Study on the expansion rate of fluorescence-enhanced region regulated by oxygen partial pressure (the temperature of the treatment process is room temperature):
[0089] A plastic desiccator was chosen as the experimental vessel to synthesize PVD-synthesized monolayer WS 2 The two-dimensional material is placed in a desiccator, and pumped with a mechanical pump for about 20 minutes to a vacuum state. Then, air and high-purity oxygen are used as gas sources, and the proportions are fed into the desiccator to control the oxygen concentration of the sample environment. Different oxygen concentrations In turn, the expansion speed of fluorescence enhancement can be regulated differently.
[0090] see the results Figure 4 and Image 6 a. Select different monolayer WS with basically the same expansion degree of edge luminescence enhancement after being placed in air for a period of time 2 The samples were stored in a desiccator with an oxygen concentration of 21% (atmosph...
Embodiment 3
[0092] Study on the expansion rate of the fluorescence-enhanced region controlled by the heating temperature (the processing atmosphere is the atmospheric atmosphere):
[0093] The samples synthesized by PVD method were placed on a heating plate, and the heating plate was adjusted to different temperatures to compare experiments. Each temperature was tracked for 90 minutes, and samples were measured every 15 minutes.
[0094] An oxygen adsorption-enhanced monolayer WS of the present invention 2 Fluorescence method, the heating plate model is ANSAI 946C.
[0095] see the results Figure 5 and Image 6 b. Select different monolayer WS with basically the same expansion degree of edge luminescence enhancement after being placed in air for a period of time 2 The samples were placed on a heating plate respectively and heated at different temperatures for 90 min, and photoluminescence scanning imaging was performed every 15 min to observe the fluorescence expansion. Figure 5 p...
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