Fig. 4 | Nature Communications

Fig. 4

From: Control of triboelectric charges on common polymers by photoexcitation of organic dyes

Fig. 4

Wavelength control in discharging of tribocharges on polymers by light. a The emission spectra of the dyes; pyrene, Coumarin 6 (C6), (4,4-Difluoro-1,3,5,7-Tetramethyl-4-Bora-3a,4a-Diaza-s-Indacene) BODIPY, and Nile Red (all in hexane) used as mediators and the emission profiles of the light sources used in discharging ultraviolet (UV) lamp, purple dashed line (centered at ca. 350 nm) and tungsten lamp, yellow dashed line). For comparison, dye concentrations were adjusted as 1 × 10−5 M, 1 × 10−5 M, 5 × 10−4 M, and 1 × 10−5 M, respectively. b Forty Poly(tetrafluoroethylene) (PTFE) beads tribocharged in the dye solutions (all 1 × 10−5 M, hexane) in glass vials illuminated on the UV lamp with the emission profile shown in a. See also Supplementary Movie 3. c Same vials are illuminated only with visible light (tungsten lamp, profile shown in a). See also Supplementary Movie 4. A wavelength match between the absorption band of the dye and the emission profile of the light source is necessary for a successful discharge—however, it is not sufficient for some dyes, e.g., pyrene, see Supplementary Movie 6 and Fig. 6 for details

Back to article page