Preparation of Transparent Film of Layered Double Hydroxide with Anionic Pyrene Derivatives and Its Luminous Toluene Detection Ability

Abstract

To prepare the transparent solid film of layered double hydroxide, the filtration-film transfer (FFT) method using LDH nanosheet colloidal suspension was investigated. It was found that the homogeneous LDH solid film with enough transparency in the visible light range could be prepared by the FFT method. Moreover, anionic pyrene (Pyr−) molecules could be incorporated into the transparent LDH solid film by immersing in anionic pyrene solution. From both absorption and emission spectra of the transparent Pyr−/LDH solid film, Pyr− incorporated in the LDH solid film formed aggregates and mainly showed the strong excimer emission. Additionally, the luminous response of the transparent Pyr−/LDH solid film was investigated in ethanol-toluene mixed solution with various toluene contents. As results, the ratio of luminescence intensities from static excimer and monomer of incorporated Pyr− molecules depended on the toluene content, and excimer emission decreased with an increase in the toluene content. This luminous response can be caused by an increase of the monomeric Pyr− species, because Pyr− aggregates are broken by adsorption of toluene molecules into the LDH interlayer space. The obtained transparent hybrid film may be useful as a detectable material of toluene in solvent by luminous change.

Recent Advances in Layered Double Hydroxide-Based Electrochemical and Optical Sensors

“…Successfully intercalating large probe molecules for optical detection often involves an ion exchange step that requires improvement. Fujimura et al fabricated a thin-film MgAl-LDH with pyrene-1-sulfonate anions for fluorometric toluene detection [154]. The MgAl-CO 3 -LDH underwent ion exchange for replacement with propionate anions, second ion exchange with acetate, and final ion exchange with pyrene-1-sulfonate (Pyr).…”

Ultra-Sensitive Detection of Pyridine in Water Using Zinc Porphyrin Incorporated in a Transparent Hydrophobic Film

“…21 The transparent LDH film bearing carbonate anions (transparent CO 3 2− -LDH film) was prepared by applying the filtration-film transfer method to an aqueous dispersion of LDH nanosheets (total volume: 2 mL, LDH particle concentration: 0.15 mg/L) according to our previous report. 19 The transparent LDH film bearing perchlorate anions (transparent Initially, the dried transparent ZnTPPS/C10S/LDH film was immersed in aqueous pyridine solutions of various concentrations ([Pyridine] = 0-0.123 mol/L) for 2 min (step 1). After removing the transparent ZnTPPS/C10S/LDH film from the aqueous pyridine solution, the film was dried by blowing with dried N 2 gas (step 2).…”

“…In this context, we have previously developed functional materials by hybridizing functional molecules, such as dyes, with ion-exchangeable layered inorganic compounds modified with amphipathic molecules. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] More specifically, an R6G/C16TMA/Lap hybrid material comprising rhodamine 6G (R6G) and laponite clay (Lap) modified by the hexadecyltrimethylammonium (C16TMA) cation, retained the luminous properties of R6G under both dry and wet conditions. 6 Through the use of hexyltrimethylammonium (C6TMA) cations with shorter alkyl chains instead of C16TMA, the luminous properties of R6G in the R6G/C6TMA/Lap hybrid material varied under dry and wet conditions.…”