Unusual Electrical Conductivity Enhancement in Stable n‐Type Carbon Nanotube Networks

Chang, Sooyon; Biswas, Prithwish; Qin, Zhao; Tian, Zhiting

doi:10.1002/smtd.202400585

Title: Unusual Electrical Conductivity Enhancement in Stable n‐Type Carbon Nanotube Networks

Journal Article · 11 August 2024 · Small Methods

DOI: https://doi.org/10.1002/smtd.202400585 · OSTI ID:2429114

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Sibley School of Mechanical and Aerospace Engineering Cornell University Ithaca NY 14853 USA
Civil and Environmental Engineering Syracuse University Syracuse NY 13244 USA

Abstract Organic molecule‐doped n‐type single‐walled carbon nanotube (SWCNT) networks are promising candidates for advanced energy applications, such as flexible thermoelectrics and photovoltaics. Yet charge transport in n‐type SWCNTs is limited by two factors: i) charge localization impeding inter‐tube transport caused by disordered mesostructure of randomly oriented SWCNTs and ii) reduction of charge carrier concentration driven by oxidation. Herein, studied the relationship between the mesostructure and thermoelectric properties of n‐type SWCNTs obtained by surfactant‐functionalization and polymer‐dopant grafting. Surprisingly, the electrical conductivity of the polymer‐doped SWCNTs keeps increasing with increasing polymer content, even after the saturation of carrier concentration, resulting in 12x higher conductivity on polymer‐doping compared to surfactant‐functionalization. While hopping transport typically dominates in disordered systems, it is shown that a bridging effect from the polymer causes unusual band‐like conduction in polymer‐doped SWCNTs. Additionally, since surfactants are essential to prevent oxidation and retain n‐type over a long duration, shows that SWCNTs obtained through a dual‐functionalization strategy using both polymer‐dopant and surfactant, demonstrates a long‐term stable high n‐type thermoelectric power factor, when the surfactant amount is carefully controlled. Besides thermoelectrics, the findings are of general interest to developing stable and conductive n‐type SWCNTs for various energy and electronic applications.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: EE0009771

OSTI ID:: 2429114

Journal Information:: Small Methods, Journal Name: Small Methods; ISSN 2366-9608

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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