Strong Electrochemiluminescence Emission from Oxidized Multiwalled Carbon Nanotubes

Abstract

Carbon nanotubes (CNTs) as well‐known nanomaterials are extensively studied and widely applied in various fields. Nitric acid (HNO3) 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 HNO3 treatment on the optical properties of CNTs. In this work, it is observed for the first time that HNO3‐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.

Mechanistic Insight into a Novel Ultrasensitive Nicotine Assay Base on High-Efficiency Quenching of Gold Nanocluster Cathodic Electrochemiluminescence

“…The pyrrolidine moiety of the nicotine molecule can be easily oxidized. SO 4 •– is a strong oxidizing intermediate which can be produced by the electroreduction of S 2 O 8 2– . , Our theoretical calculations predict that the reaction energy for nicotine oxidation by SO 4 •– is appropriate. Thus, combining high-performance AuNCs/S 2 O 8 2– ECL systems, − we designed and realized a facile “turn off” ECL platform for nicotine analysis, based on the quenching of cathodic ECL of the AuNC probe.…”

“…The above results suggest that the competing reaction of SO 4 •– with nicotine hampered the reaction of eq , thus resulting in the ECL quenching of the CR-AuNCs/K 2 S 2 O 8 system (eq ). The detailed mechanism is illustrated in Scheme , and the possible quenching mechanism can be expressed as follows …”

“…Figure 4A shows that the ECL sensor incubated with various interfering substances (10 mM) had a negligible influence on nicotine (1 mM) detection. Notably, although glutathione could strongly quench the ECL of the CR-AuNCs/K 2 S 2 O 8 system, 19 the interference from glutathione could be eliminated by the addition of 20 μM Fe 3+ owing to the specific covalent binding between Fe 3+ and the amine groups of glutathione. 31 Therefore, the proposed ECL biosensor showed favorable selectivity for nicotine detection.…”

CVD Conditions for MWCNTs Production and Their Effects on the Optical and Electrical Properties of PPy/MWCNTs, PANI/MWCNTs Nanocomposites by In Situ Electropolymerization

“…This band was narrower than in not purified CNTs, and it is evidence of an adequate purification process. D′ is also related to the lattice vibration of defective graphite-like materials [84,85]. In the case of CNTs structures, the D band (disorder band) is identified as the A1g symmetrical stretching coming from disorder and defects present in CNTs [86]; the G band (graphitic band) is associated with tangential phonon modes; the G′ band is an overtone of the D band, which is related to the stacking order of graphene sheets [87].…”

Nanocarbon Chemistry

“…1 Concept [18] and 12 Full Papers [19][20][21][22][23][24][25][26][27][28][29][30] from more than 30 different and excellent research groups from all over the world, covering the most recent progress and achievements in chemistry of various nanocarbon films (e.g., graphene, diamond, diamond-like carbon, carbon nanotubes, fullerene, etc. ), nanostructures (e.g., graphene/carbon dots, diamond particles, etc.…”