Disclosed is an optical fiber including a plasmonic optical filter with a closed curved shape provided at, at least portion thereof. A method of manufacturing the plasmonic optical filter includes a step of exposing a core, a step of forming a thin metal film on the core through physical vapor deposition while rotating the core in a circumferential direction after changing a rotation axis of the core, and a step of patterning nanopatterns on the cylinder-shaped thin metal film using focused ion beam technique assisted with endpoint detection method. Due to such constitutions, an active area to generate an optical signal for optical sensor can be increased.

The electroconductive filler of the present invention is formed of glass fiber powder and granules. The glass fiber is equipped with a metal coating in the longitudinal direction of the glass fiber, and the glass fiber has a fiber length distribution. L10 (a fiber length at 10% in a number-basis cumulative distribution is 20 m to 200 m, L97 (a fiber length at 97% in the number-basis cumulative distribution) is 400 m to 1000 m, and the glass fiber mean fiber diameter is 1 to 40 m.

The electroconductive filler of the present invention is formed of glass fiber powder and granules. The glass fiber is equipped with a metal coating in the longitudinal direction of the glass fiber, and the glass fiber has a fiber length distribution. L10 (a fiber length at 10% in a number-basis cumulative distribution is 20 m to 200 m, L97 (a fiber length at 97% in the number-basis cumulative distribution) is 400 m to 1000 m, and the glass fiber mean fiber diameter is 1 to 40 m.

A manufacturing method of a metal-coated glass fiber according to the present invention includes: drawing a glass fiber from a bushing nozzle of a glass melting furnace; discharging, from an orifice of a metal melting furnace in which a metal for forming a metal coating layer is melted, a molten metal in a dome shape or substantially spherical shape; and bringing the glass fiber into contact with the molten metal, wherein the metal melting furnace has on a wall surface thereof two orifices to discharge two droplets of the molten metal such that end portions of the two droplets abut or overlap each other to define a recess therebetween, and wherein the metal coating layer is formed on the glass fiber by passing the glass fiber downward through the recess and bringing the glass fiber into contact with both of the two droplets.

A manufacturing method of a metal-coated glass fiber according to the present invention includes: drawing a glass fiber from a bushing nozzle of a glass melting furnace; discharging, from an orifice of a metal melting furnace in which a metal for forming a metal coating layer is melted, a molten metal in a dome shape or substantially spherical shape; and bringing the glass fiber into contact with the molten metal, wherein the metal melting furnace has on a wall surface thereof two orifices to discharge two droplets of the molten metal such that end portions of the two droplets abut or overlap each other to define a recess therebetween, and wherein the metal coating layer is formed on the glass fiber by passing the glass fiber downward through the recess and bringing the glass fiber into contact with both of the two droplets.

A glass fiber filter element for visible light photocatalysis and air purification and a method for preparing the same. The glass fiber filter element includes 4 to 7 wt % of nanoparticles including at least one selected from zinc oxide, graphene oxide, titanium oxide, and reduced graphene oxide, 2 to 7 wt % of silver nanowires, 3 to 12 wt % of an adhesive system, and 78 to 91 wt % of a glass fiber mat, based on the total weight of the glass fiber filter element. The glass fiber mat is made of at least two glass fibers with different diameters, and the diameters are in a range of 0.15 to 3.5 ?m. The nanoparticles have a particle size from 1 to 200 nm, and the silver nanowires have a diameter of 15 to 50 nm.

A glass fiber filter element for visible light photocatalysis and air purification and a method for preparing the same. The glass fiber filter element includes 4 to 7 wt % of nanoparticles including at least one selected from zinc oxide, graphene oxide, titanium oxide, and reduced graphene oxide, 2 to 7 wt % of silver nanowires, 3 to 12 wt % of an adhesive system, and 78 to 91 wt % of a glass fiber mat, based on the total weight of the glass fiber filter element. The glass fiber mat is made of at least two glass fibers with different diameters, and the diameters are in a range of 0.15 to 3.5 ?m. The nanoparticles have a particle size from 1 to 200 nm, and the silver nanowires have a diameter of 15 to 50 nm.

Provided is process for producing a surface-metalized fiber, yarn, or fabric, the process comprising: (a) preparing a graphene dispersion comprising multiple graphene sheets and an optional conductive filler dispersed in a first liquid medium, which is an adhesive monomer or contains a liquid adhesive monomer or oligomer dissolved in a solvent; (b) feeding a continuous fiber, yarn, or fabric from a feeder roller into a deposition zone, wherein the graphene dispersion is dispensed to deposit the graphene sheets to a surface of the fiber, yarn, or fabric; (c) moving the graphene-coated fiber, yarn, or fabric into a metallization chamber which accommodates a plating solution therein for plating a layer of a desired metal onto the graphene-coated fiber, yarn, or fabric to obtain a surface-metalized fiber, yarn, or fabric; and (d) operating a winding roller to collect the surface-metalized fiber, yarn, or fabric.

Provided is process for producing a surface-metalized fiber, yarn, or fabric, the process comprising: (a) preparing a graphene dispersion comprising multiple graphene sheets and an optional conductive filler dispersed in a first liquid medium, which is an adhesive monomer or contains a liquid adhesive monomer or oligomer dissolved in a solvent; (b) feeding a continuous fiber, yarn, or fabric from a feeder roller into a deposition zone, wherein the graphene dispersion is dispensed to deposit the graphene sheets to a surface of the fiber, yarn, or fabric; (c) moving the graphene-coated fiber, yarn, or fabric into a metallization chamber which accommodates a plating solution therein for plating a layer of a desired metal onto the graphene-coated fiber, yarn, or fabric to obtain a surface-metalized fiber, yarn, or fabric; and (d) operating a winding roller to collect the surface-metalized fiber, yarn, or fabric.

Provided is process for producing a surface-metalized fiber, yarn, or fabric, the process comprising: (a) Feeding a continuous fiber, yarn, or fabric from a feeder roller into a graphene deposition chamber containing therein a graphene dispersion comprising multiple graphene sheets and an optional conducive filler dispersed in a first liquid medium and an optional adhesive resin dissolved in the first liquid medium; (b) Operating the graphene deposition chamber to deposit the graphene sheets and optional conductive filler to a surface of the fiber, yarn, or fabric for forming a graphene-coated fiber, yarn, or fabric; (c) Moving the graphene-coated fiber, yarn, or fabric into a metallization chamber which accommodates a plating solution therein for plating a layer of a desired metal onto the graphene-coated fiber, yarn, or fabric to obtain a surface-metalized fiber, yarn, or fabric; and (d) Operating a winding roller to collect the surface-metalized fiber, yarn, or fabric.