Synthesis of dopamine-derived N-doped carbon nanotubes/Fe 3 O 4 composites as enhanced electrochemical sensing platforms
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ORIGINAL PAPER
Synthesis of dopamine-derived N-doped carbon nanotubes/Fe3O4 composites as enhanced electrochemical sensing platforms for hydrogen peroxide detection Yanan Zhao 1,2 & Danqun Huo 1 & Liuyi Jiang 1 & Shiying Zhou 1 & Mei Yang 1 & Changjun Hou 1,3 Received: 4 May 2020 / Accepted: 26 September 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract A novel preparation of dopamine-derived N-doped carbon nanotubes/Fe3O4 composites (N-CNTs/Fe3O4 Cs) is demonstrated via facile hydrothermal route and calcination treatment. In this approach, dopamine was selected as Ncontaining precursor, which can promote Fe3O4 nanocrystal deposition uniformly on the surface of CNTs and effectively modulated the graphitic structure with doped pyridinic N and graphitic N to improve the electrochemical performance of carbon composites. More interestingly, the inhibited growth of the Fe3O4 crystal during calcination can be effectively avoided by soaking PDA-CNT/Fe3O4 Cs in a phosphate solution before calcination. The N-CNTs/Fe3O4 Cs have an enhanced electrocatalytic activity toward hydrogen peroxide with high sensitivity (316.27 mA M−1 cm−2) and wide linear range (0.006–2.057 mM). The N-CNTs/Fe3O4 Cs modified sensor was successfully applied to real-time detection of H2O2 released from living cancer cells, displaying a potential application in the study of oxidative stress-related diseases. This work demonstrates a rational way for highperformance electrocatalytic material synthesis and bioanalysis.
Keywords Polydopamine . N-doped carbon nanotubes . Fe3O4 . Hydrogen peroxide detection . Cancer cell H2O2 release
Introduction Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04575-2) contains supplementary material, which is available to authorized users. * Danqun Huo [email protected] * Mei Yang [email protected] * Changjun Hou [email protected] 1
Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College, Chongqing University, Chongqing 400044, People’s Republic of China
2
Analytical and Testing Center of Southwest University, Chongqing 400715, People’s Republic of China
3
Chongqing Key Laboratory of Bio-perception & Intelligent Information Processing, School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, People’s Republic of China
Carbon composite is of growing interest for fabrication of excellent performance materials in sensoring devices, energy, and catalytic applications [1–3]. Owing to inherently inert of graphitic carbons, nanotubes (CNTs) generally require to be activated by chemical oxidation such as HNO3 and H2SO4 [4] or developed the noncovalent interaction of biomolecules or polymers [5–7] to separate CNT agglomerates and facilitate the binding sites. Unfortunately, such oxygen-containing functionalization and molecules layers accompany defect formation that deteriorates the elec
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