Tuning Magnetic Properties of a Carbon Nanotube-Lanthanide Hybrid Molecular Complex through Controlled Functionalization

Molecules

Emmanuel Flahaut¹  RudolphM. Erasmus²  Thomas Blon³  Benjamin Lassagne³  Christopher Coleman⁴  VenkateswaraRao Sodisetti⁴  Siphephile Ncube⁴  IbwangaS. Mosse⁴  AlvaroS. de Sousa⁴  Somnath Bhattacharyya⁴  Tomas Šamořil⁵ 

[1] CIRIMAT, Université de Toulouse, CNRS, INPT, UPS, UMR CNRS-UPS-INP No. 5085, Université Toulouse Paul Sabatier, Bât. CIRIMAT, 118, Route de Narbonne, CEDEX 9, 31062 Toulouse, France;DSI-NRF Centre of Excellence in Strong Materials and School of Physics, University of the Witwatersrand, Johannesburg Wits 2050, South Africa;Laboratoire de Physique et Chimie des Nano-Objets, Université de Toulouse, UMR 5215 INSA, CNRS, UPS, 135 Avenue de Rangueil, CEDEX 4, F-31077 Toulouse, France;Nano-Scale Transport Physics Laboratory, School of Physics, University of the Witwatersrand, Johannesburg Wits 2050, South Africa;TESCAN Orsay Holding, a.s., Libušina tř. 21, 623 00 Brno, Czech Republic;

关键词: multi-walled carbon nanotubes;    Raman spectroscopy;    spintronics;   

DOI  :  10.3390/molecules26030563

来源: DOAJ

【 摘 要 】

Molecular magnets attached to carbon nanotubes (CNT) are being studied as potential candidates for developing spintronic and quantum technologies. However, the functionalization routes used to develop these hybrid systems can drastically affect their respective physiochemical properties. Due to the complexity of this systems, little work has been directed at establishing the correlation between the degree of functionalization and the magnetic character. Here, we demonstrate the chemical functionalization degree associated with molecular magnet loading can be utilized for controlled tuning the magnetic properties of a CNT-lanthanide hybrid complex. CNT functionalization degree was evaluated by interpreting minor Raman phonon modes in relation to the controlled reaction conditions. These findings were exploited in attaching a rare-earth-based molecular magnet (Gd-DTPA) to the CNTs. Inductively coupled plasma mass spectrometry, time-of-flight secondary ion mass spectrometry and super conducting quantum interference device (SQUID) measurements were used to elucidate the variation of magnetic character across the samples. This controlled Gd-DTPA loading on the CNT surface has led to a significant change in the nanotube intrinsic diamagnetism, showing antiferromagnetic coupling with increase in the Weiss temperature with respect to increased loading. This indicates that synthesis of a highly correlated spin system for developing novel spintronic technologies can be realized through a carbon-based hybrid material.

【 授权许可】

Unknown