▎ 摘　　要

NOVELTY - Pen with conductive fiber comprises fiber substrate. The surface of fiber substrate is attached with 10-100 mu m thick graphene material comprising (preferably) reduced graphene oxide or reduced weakly oxidized biological graphene. USE - Used as pen with conductive fiber. ADVANTAGE - The conductive pen has good service life. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) capacitive pen comprising a graphene material attached to the fiber surface of the tip of the capacitive pen, where pen is capacitive brush, capacitive soft brush and capacitive soft head rod; (2) touch device comprising capacitive pen, where touch device is mobile phone, computer, tablet computer, displayer, operation panel and writing board; and (3) manufacturing capacitive pen comprising (1) immersing pen with fiber substrate or fiber tip into graphene aqueous solution, allowing to stand, removing, and airing or drying, and (ii) immersing pen into aqueous solution of the reinforcing agent, removing, rinsing, and airing or drying, where reinforcing agent is L-ascorbic acid, pyrogallic acid, sodium hexametaphosphate, and/or thiourea dioxide.