A dual-stimuli-responsive fluorescent switch ultrathin film. Issue 40 (24th September 2015)

• Record Type: Journal Article
• Authors: Li, Zhixiong; Liang, Ruizheng; Liu, Wendi; Yan, Dongpeng; Wei, Min
• Is Part Of: Nanoscale. Volume 7:Issue 40(2015)
• Page Start: 16737
• Page End: 16743
• Publication Date: 2015-09-24
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c5nr05376e
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : A dual-stimuli-responsive fluorescent switch ultrathin film based on spiropyran, riboflavin and LDH nanoplatelets was fabricated following three steps by employing the layer-by-layer technique, which exhibited a reversible three-state switchable multicolor luminescence by stimulating with UV/Vis light and different pH. Abstract : Stimuli-responsive fluorescent switches have shown broad applications in optical devices, biological materials and intelligent responses. Herein, we describe the design and fabrication of a dual-stimuli-responsive fluorescent switch ultrathin film (UTF) via a three-step layer-by-layer (LBL) technique: (i) encapsulation of spiropyran (SP) within an amphiphilic block copolymer (PTBEM) to give the (SP@PTBEM) micelle; (ii) the mixture of riboflavin (Rf) and poly(styrene 4-sulfonate) (PSS) to enhance the adhesion ability of small molecules; (iii) assembly of negatively charged SP@PTBEM and Rf–PSS with cationic layered double hydroxide (LDH) nanoplatelets to obtain the (Rf–PSS/LDH/SP@PTBEM) n UTFs ( n : bilayer number). The assembly process of the UTFs and their luminescence properties, as monitored by fluorescence spectroscopy and scanning electron microscopy (SEM), present a uniform and ordered layered structure with stepwise growth. The resulting Rf–PSS/LDH/SP@PTBEM UTF serves as a three-state switchable multicolor (green, yellow, and red) luminescent system based on stimulation from UV/Vis light and pH, with an acceptable reversibility. Therefore, this work provides a facile way to fabricate stimuli-responsive solid-state film switches with tunable-color luminescence, which have potential applications in the areas of displays, sensors, and rewritable optical memory and fluorescent logic devices.