Boron nitride nanotubes (BNNTs) are receiving great attention because of their unusual material properties, such as high thermal conductivity, mechanical strength, and electrical resistance. However, high-throughput and highefficiency synthesis of BNNTs has been hindered due to the high boiling point of boron (~ 4000℃) and weak interaction between boron and nitrogen. Although, hydrogen-catalyzed plasma synthesis has shown potential for scalable synthesis of BNNTs, the direct use of H2 gas as a precursor material is not strongly recommended, as it is extremely flammable. In the present study, BNNTs have been synthesized using radio-frequency inductively coupled thermal plasma (RF-ITP) catalyzed by solid-state ammonium chloride (NH4Cl), a safe catalyst materials for BNNT synthesis. Similar to BNNTs synthesized from h-BN (hexagonal boron nitride) + H2, successful fabrication of BNNTs synthesized from h-BN+NH4Cl is confirmed by their sheet-like properties, FE-SEM images, and XRD analysis. In addition, improved dispersion properties in aqueous solution are found in BNNTs synthesized from h-BN +NH4Cl.

Abstract
 1. Introduction
 3. Experimental
 4. Results and Discussion
 5. Conclusion
 References

• Mi Se Chang(Metal Powder Department, Korea Institute of Materials Science)
• Young Gyun Nam(Metal Powder Department, Korea Institute of Materials Science)
• Sangsun Yang(Metal Powder Department, Korea Institute of Materials Science)
• Kyung Tae Kim(Metal Powder Department, Korea Institute of Materials Science)
• Ji Hun Yu(Metal Powder Department, Korea Institute of Materials Science)
• Yong-Jin Kim(Metal Powder Department, Korea Institute of Materials Science)
• Jae Won Jeong(Metal Powder Department, Korea Institute of Materials Science) Corresponding Author