Synthesis and Characterization of the Thermoelectric Nickel Tetrathiooxalate Polymer as Nanoparticles

• 作者: Benoî Christophe Faulmann Dominique de Caro Kane Jacob Lydie Valade Pascale de Caro t Cormary
• 来源期刊: 材料科学与化学工程(英文)
• 学科: 化学
• 关键词: CONDUCTIVE COORDINATION Polymers Tetrathiooxalate POLYETHYLENE GLYCOL Biobased Polyesters NANOPARTICLES
• 年，卷（期）: clkxyhxgcyw_2020,（4）
• 页码范围: 1-12
• 页数: 12页
• 分类号: O63

摘要

Nanoparticles of the conductive coordination polymer Ni(tto) have been synthesized under mild conditions in the presence of bio-based polyesters or polyethylene glycol acting as growth controlling agents. With polyesters, aggregates of particles are observed whereas well dispersed nanoparticles are obtained with polyethylene glycol. Indeed, for a Ni2+/polyethylene glycol weight ratio of 0.031, transmission electron micrographs evidence dispersed particles exhibiting sizes in the 3 - 10 nm range. Infrared spectra for nanopowders show two CS stretching modes in the 1100 - 1190 cm−1 range, confirming the presence of the tetrathiooxalate ligand coordinated to the nickel center. The room-temperature electrical conductivity for the nanopowder prepared in the presence of polyethylene glycol is about 0.8 S∙cm−1, a decent value for tetrathiolate-based polymers. Finally, magnetic susceptibility measurements for well-dispersed Ni(tto) particles evidence a Curie-Weiss law in a large temperature range. Moreover, low temperatures measurement would confirm intra- or interchain interactions between nickel atoms within the Ni(tto) polymer chains.