Shuangwen Li

Area of research

Mechanics of Materials · Electronic, Optical and Magnetic Materials

Research interest

Research topics from publications: Self‐Protective Room‐Temperature Phosphorescence of Fluorine and Nitrogen Codoped Carbon Dots; Highly transparent, strong, and flexible fluorographene/fluorinated polyimide nanocomposite films with low dielectric constant; Thermal conductive and flexible silastic composite based on a hierarchical framework of aligned carbon fibers-carbon nanotubes; A sulfonimide-based alternating copolymer as a single-ion polymer electrolyte for high-performance lithium-ion batteries; Solid-State Fluorescence of Fluorine-Modified Carbon Nanodots Aggregates Triggered by Poly(ethylene glycol); Reduced graphene oxide doped predominantly with CF2 groups as a superior anode material for long-life lithium-ion batteries. Representative work: Abstract The unstable triplet excited state is a core problem when developing self‐protective room temperature phosphorescence (RTP) in carbon dots (CDs). Here, fluorine and nitrogen codoped carbon dots (FNCDs) with long‐lived triplet excited states, emitting pH‐stabilized blue fluorescence and pH‐responsive green self‐protective RTP, are reported for the first time. The self‐protective RTP of FNCDs arises from n–π * electron transitions for CN/CN bonds with a small energy gap between singlet and triplet states at room temperature. Moreover, the interdot/intradot hydrogen bonds and steric protection of CF bonds reduce quenching of RTP by oxygen at room temperature. The RTP emission of FNC Transparent and flexible fluorinated polyimide films with loading of well-dispersed fluorographene exhibit low dielectric constants

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