Figure | Rapid optical fabrication and schematic via SLM-FPL, electrode array processing with patterning demonstration, and application validation of graphene-based SEP-MSCs. (IMAGE)
Caption
Figure | Rapid optical fabrication and schematic via SLM-FPL, electrode array processing with patterning demonstration, and application validation of graphene-based SEP-MSCs. Figure 1a presents the SLM-FPL setup, where a femtosecond laser (800 nm, 1 kHz, 40 fs) is shaped and focused onto a GO film to fabricate graphene micro-supercapacitors in situ. This process achieves a 7,000-fold efficiency gain over direct writing at 0.1 mm/s, monitored in real time by CCD. The fabrication relies on synergistic effects: photothermal/photochemical reduction forms electrodes; unirradiated GO acts as insulation; SLM patterns electrodes; and SPP interference creates tunable sub-wavelength gratings. Combined, these enable efficient fabrication of graphene-on-silicon planar micro-supercapacitors. Figure 1b presents the arrayed series-connected SEP-MSCs fabricated by this method, as well as representative patterns such as the university emblem and differently sized “cow” logos. Notably, the processed regions exhibit significant optical diffraction and viewing-angle-dependent effects due to their periodic micro/nanograting surface structures. The uniform structural colors displayed by these patterns macroscopically reflect the high regularity, periodicity, and consistency of the fabricated surface micro/nanostructures. Figure 1c presents the test system constructed based on the classical working model. After the device was stably charged, its output was connected to the comparator input; when the output voltage reached the preset threshold of 0.3 V, the comparator was triggered and immediately illuminated the connected light-emitting diode. This rapid response demonstrates that the SEP-MSC device can reliably trigger low-power electronic components.
Credit
Wei Xin et al.
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CC BY