Carbogenic Nanodots: Photoluminescence and Room-Temperature Ferromagnetism

被引：53

作者：

Srivastava, Sachchidanand ^{[1
]}

Gajbhiye, Namdeo S. ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Chem, Kanpur 208016, Uttar Pradesh, India

来源：

CHEMPHYSCHEM | 2011年 / 12卷 / 14期

关键词：

carbogenic nanodots; EPR spectroscopy; graphene; magnetic properties; photoluminescence; GRAPHENE QUANTUM DOTS; CARBON NANOTUBES; SPIN; NANORIBBONS; MAGNETISM; GRAPHITE; DIAMOND; NANOGRAPHITE; DELIVERY; DEFECTS;

D O I：

10.1002/cphc.201100188

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Herein, blue fluorescent carbogenic nanodots (CNDs) with room-temperature ferromagnetism were synthesized by thermal decomposition of organic precursors at different temperatures. Photoluminescence (PL) studies show excitation-wavelength-dependent emission properties and PL excitation (PLE) studies confirm the triplet ground state of carbene at the zigzag edge as the fluorescent center. Room-temperature magnetic studies reveal the ferromagnetic nature of CNDs and temperature-dependent studies show the presence of an antiferromagnetic phase along with a ferromagnetic phase below 50 K. EPR studies reveal the presence of conduction electrons and localized spins with different g factors. Localized spins at zigzag edges are the origin of the unconventional magnetic behavior, whereas exchange coupling between conduction and localized spins are responsible for long-range magnetic ordering.

引用

页码：2624 / 2632

页数：9

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