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Strong Electrochemiluminescence Emission from Oxidized Multiwalled Carbon Nanotubes
Author(s) -
Wang Ruina,
Wu Haishan,
Chen Rui,
Chi Yuwu
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201901550
Subject(s) - electrochemiluminescence , nanomaterials , carbon nanotube , raman spectroscopy , materials science , graphene , x ray photoelectron spectroscopy , nanotechnology , quantum dot , carbon fibers , transmission electron microscopy , chemical engineering , chemistry , composite number , electrode , composite material , physics , engineering , optics
Carbon nanotubes (CNTs) as well‐known nanomaterials are extensively studied and widely applied in various fields. Nitric acid (HNO 3 ) is often used to treat CNTs for purification purposes and preparing oxidized CNTs for various applications. However, too little attention is paid to investigating the effect of HNO 3 treatment on the optical properties of CNTs. In this work, it is observed for the first time that HNO 3 ‐oxidized multiwalled carbon nanotubes (ox‐MWCNTs) have strong electrochemiluminescence (ECL) activity, which enables ox‐MWCNTs to become new and good ECL carbon nanomaterials after carbon quantum dots (CQDs) and graphene quantum dots (GQDs). Various characterization technologies, such as transmission electron microscope (TEM), X‐ray photoelectron spectroscopy (XPS), and Raman spectroscopy, are used to reveal the relationship between ECL activity and surface states. The ECL behaviors of ox‐MWCNTs are investigated in detail and a possible ECL mechanism is proposed. Finally, the new ECL nanomaterials of ox‐MWCNTs are envisioned to have promising applications in sensitive ECL sensing and in the study of CNT‐based catalysts.