Fluorene-Based Two-Dimensional Covalent Organic Framework with Thermoelectric Properties through Doping

Liangying Wang; Bin Dong; Rile Ge; Fengxing Jiang; Jingkun Xu

doi:10.1021/acsami.6b14916

Fluorene-Based Two-Dimensional Covalent Organic Framework with Thermoelectric Properties through Doping

ACS Appl Mater Interfaces. 2017 Mar 1;9(8):7108-7114. doi: 10.1021/acsami.6b14916. Epub 2017 Feb 20.

Authors

Liangying Wang¹, Bin Dong^{1

2}, Rile Ge¹, Fengxing Jiang³, Jingkun Xu³

Affiliations

¹ Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, China.
² College of Chemical Engineering, China University of Mining and Technology , Xuzhou 221116, China.
³ College of Pharmacy, Jiangxi Science and Technology Normal University , Nanchang 330013, China.

PMID: 28192662
DOI: 10.1021/acsami.6b14916

Abstract

Organic semiconductors have great potential as flexible thermoelectric materials. A fluorene-based covalent organic framework (FL-COF-1) was designed with the aim of creating an enhanced π-π interaction among the crystalline backbones. By the introduction of fluorene units into the frameworks, the FL-COF-1 had high thermal stability with a BET surface area over 1300 m² g^-1. The open frameworks were favorable for doping with iodine and followed with the improved charge carrier mobility. The compressed pellet of I₂@FL-COF-1 exhibited a high Seebeck coefficient of 2450 μV K^-1 and power factor of 0.063 μW m^-1 K^-2 at room temperature, giving the first example of COFs' potential application as thermoelectric materials.

Keywords: covalent organic frameworks; electrical conductivity; fluorene units; iodine doping; thermoelectric properties.