Luminescent ?-Carrageenan-Based Electrolytes Containing Neodymium Triflate.

ABSTRACT: In recent years, the synthesis of polymer electrolyte systems derived from biopolymers for the development of sustainable green electrochemical devices has attracted great attention. Here electrolytes based on the red seaweeds-derived polysaccharide ?-carrageenan (?-Cg) doped with neodymium triflate (NdTrif?) and glycerol (Gly) were obtained by means of a simple, clean, fast, and low-cost procedure. The aim was to produce near-infrared (NIR)-emitting materials with improved thermal and mechanical properties, and enhanced ionic conductivity. Cg has a particular interest, due to the fact that it is a renewable, cost-effective natural polymer and has the ability of gelling in the presence of certain alkali- and alkaline-earth metal cations, being good candidates as host matrices for accommodating guest cations. The as-synthesised ?-Cg-based membranes are semi-crystalline, reveal essentially a homogeneous texture, and exhibit ionic conductivity values 1?2 orders of magnitude higher than those of the ?-Cg matrix. A maximum ionic conductivity was achieved for 50 wt.% Gly/?-Cg and 20 wt.% NdTrif?/?-Cg (1.03 × 10-4, 3.03 × 10-4, and 1.69 × 10-4 S cm-1 at 30, 60, and 97 °C, respectively). The NdTrif-based ?-Cg membranes are multi-wavelength emitters from the ultraviolet (UV)/visible to the NIR regions, due to the ?-Cg intrinsic emission and to Nd3+, ?F3/2??I11/2-9/2.

SUBMITTER: Nunes SC 

PROVIDER: S-EPMC6471547 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature