1. Luminescent κ-Carrageenan-Based Electrolytes Containing Neodymium Triflate.
- Author
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Nunes SC, Saraiva SM, Pereira RFP, Silva MM, Carlos LD, Almeida P, Gonçalves MC, Ferreira RAS, and Bermudez VZ
- Subjects
- Biopolymers radiation effects, Carrageenan chemical synthesis, Electric Conductivity, Electrolytes chemical synthesis, Gels chemical synthesis, Gels chemistry, Glycerol chemical synthesis, Luminescence, Neodymium chemistry, Ultraviolet Rays, Biopolymers chemistry, Carrageenan chemistry, Electrolytes chemistry, Glycerol chemistry
- 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 κ-carrageenan (κ-Cg) doped with neodymium triflate (NdTrif₃) 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 κ-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 κ-Cg matrix. A maximum ionic conductivity was achieved for 50 wt.% Gly/κ-Cg and 20 wt.% NdTrif₃/κ-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 κ-Cg membranes are multi-wavelength emitters from the ultraviolet (UV)/visible to the NIR regions, due to the κ-Cg intrinsic emission and to Nd3+ , ⁴F3/2 →⁴I11/2-9/2 .- Published
- 2019
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