title: 8-Anilino-1-naphthalenesulfonate/Layered Double Hydroxide Ultrathin Films: Small Anion Assembly and Its Potential Application as a Fluorescent Biosensor.
abstract: The fluorescent dye 8-anilino-1-naphthalenesulfonate (ANS) is a widely used fluorescent probe molecule for biochemistry analysis. This paper reported the fabrication of ANS/layered double hydroxide nanosheets (ANS/LDH)n ultrathin films (UTFs) via the layer-by-layer small anion assembly technique based on electrostatic interaction and two possible weak interactions: hydrogen-bond and induced electrostatic interactions between ANS and positive-charged LDH nanosheets. The obtained UTFs show a long-range-ordered periodic layered stacking structure and weak fluorescence in dry air or water, but it split into three narrow strong peaks in a weak polarity environment induced by the two-dimensional (2D) confinement effect of the LDH laminate; the fluorescence intensity increases with decreasing the solvent polarity, concomitant with the blue shift of the emission peaks, which show good sensoring reversibility. Meanwhile, the UTFs exhibit selective fluorescence enhancement to the bovine serum albumin (BSA)-like protein biomolecules, and the rate of fluorescence enhancement with the protein concentration is significantly different with the different protein aggregate states. The (ANS/LDH)n UTF has the potential to be a novel type of biological flourescence sensor material.
authors: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.
authors: Ping
authors: P
authors: Zhang
authors: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.
authors: Ling
authors: L
authors: Li
authors: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.
authors: Yun
authors: Y
authors: Zhao
authors: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.
authors: Zeyun
authors: Z
authors: Tian
authors: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.
authors: Yumei
authors: Y
authors: Qin
authors: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China.
authors: Jun
authors: J
authors: Lu