Abstract
This paper describes a simple strategy for covalently attaching silica-coated gold nanorods (sGNRs) onto the surface of multi-walled carbon nanotubes (MWNT) to fabricate hybrid nanostructures. The crosslinked reaction occurs through interaction of carboxyl groups on the MWNT with the amino silane coupling agent modified sGNRs. TEM, FT-IR spectroscopy, UV-vis spectroscopy, and Zeta potential analysis have been used to study the formation of MWNT/sGNRs nanostructure. Furthermore, MWNT/sGNRs hybrid material shows an excellent solubility in aqueous solution and an enhanced absorption in the near-infrared region. It should open up new possibilities in nanomedicine as multimodal photoacoustic and photothermal high-contrat molecular agent.
Highlights
Carbon nanotubes (CNTs) have been intensively studied in recent years due to their unique structural, electrical, mechanical, optical, thermal and chemical properties [112]
Our results showed that the resulting multi-walled carbon nanotubes (MWNT)/silica-coated gold nanorods (sGNRs) have markedly near-infrared region (NIR) absorption enhancer
Thorough high resolution HR-transmission electron microscope (TEM) characterizations revealed the highly crystalline nature of MWNT in Figure 1(b), Figure 1(c) shows the morphology and the size distribution of silica-coated Gold nanorods (GNRs), indicating GNRs were fully encapsulated by silica
Summary
Carbon nanotubes (CNTs) have been intensively studied in recent years due to their unique structural, electrical, mechanical, optical, thermal and chemical properties [112]. In vivo applications have been limited by the relatively low absorption displayed by nanotubes at near-infrared region (NIR) and concerns over toxicity. Golden carbon have been strategically designed and synthesized by depositing a thin layer of gold around the CNTs for photoacoustic and photothermal imaging in vivo [17]. The gold layer acts as an NIR absorption enhancer and could potentially address the issues of toxicity. Controllable synthesis of golden carbons is still a challengeable task, so developing a simple and effective method for prepared an NIR absorption enhancer CNTs has became a hotspot
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