| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Quantum Defects Constructed by Diazonium Salt Chemistry: Efficient Covalent Functionalization of Carbon Nanotubes |
| ZHAO Yuqing, YIN Taishan, HUANG Zhongjie*
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| State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China |
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Abstract As one-dimensional quantum materials, single-walled carbon nanotubes (SWCNTs) exhibit unique electrical and optical properties. By introducing sp3 defects into the sp2 lattice of semiconductor SWCNTs, traditionally undesirable crystal defects can be transformed into molecular focal points that modulate the coupling of electrons, excitons, phonons, and spins. These quantum defects hold significant potential for applications in room-temperature single-photon sources, near-infrared II bioimaging, and chemical sensing. However, current synthesis research is largely confined to solution-based systems, with limited exploration of synthesis on solid-state films, which are crucial for applications in optoelectronic devices, photonic systems, and quantum networks. This study focuses on three core areas: film preparation, in-situ defect synthesis on these films, and their characterization. This work utilized potassium iodide to reduce aryl diazonium salts for functionalizing and modifying SWCNTs, systematically controlling reaction time and reactant concentration to achieve consistent functionalization effects. The method is simple, fast, and efficient, requiring no additional light, electrical, or thermal conditions. The enhanced D peaks in Raman spectra and the emergence of new emission peaks in fluorescence spectra confirm the successful synthesis of quantum defects. The research successfully demonstrates the synthesis of quantum defects on films, contributing to the advancement of their applications in bioimaging, sensors, and quantum technologies.
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Published: 10 March 2026
Online: 2026-03-10
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