title: Cellulose nanofibril based graft conjugated polymer films act as a chemosensor for nitroaromatic.
abstract: A cellulose nanofibril film is modified by chemical assembly of boronate-terminated conjugated polymer chains at its specific sites, C-6 carboxyl groups. The modified cellulose nanofibril film is used as a fluorescent sensor for nitroaromatic vapor. Thanks to the specific reactive sites, numerous loose cavities or pathways located in the film sensor's out-layer have been formed, and the fraction of easily accessible cavities of the novel fluorescent film sensor is up to 0.97, which could benefit the penetration and diffusion of analyte vapor. Therefore, the novel fluorescent film sensor exhibits high sensitivity toward nitroaromatic vapor with a fast response. The fluorescence quenching efficiency of the chemical-assembly film sensor is about 3 times larger than that of the spin-cast film sensor using the same conjugated polymer for 600 s exposure to DNT vapor. In addition, the novel fluorescent film sensor shows good reversibility.
authors.affiliation: School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, PR China. Electronic address: niuqingyuan1984@126.com.
authors.forename: Qingyuan
authors.initials: Q
authors.lastname: Niu
authors.affiliation: School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, PR China.
authors.forename: Kezheng
authors.initials: K
authors.lastname: Gao
authors.affiliation: School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, PR China. Electronic address: wuwh@bit.edu.cn.
authors.forename: Wenhui
authors.initials: W
authors.lastname: Wu
mesh_terms: D002482:Cellulose / Q000737:chemistry* / Q000378:metabolism; D005456:Fluorescent Dyes / Q000737:chemistry* / Q000378:metabolism; D057139:Nanofibers / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry* / Q000378:metabolism
chemical_list: D005456:Fluorescent Dyes; D011108:Polymers; D002482:Cellulose
keywords: Cellulose nanofibril; Chemical assembly; Conjugated polymer; Fluorescent sensor; Nitroaromatic