Effects of Catalyst Pretreatment on Carbon Nanotube Synthesis from Methane Using Thin Stainless-Steel Foil as Catalyst by Chemical Vapor Deposition Method

• Published in: Nanomaterials (Basel, Switzerland) Vol. 11; no. 1; p. 50
• Main Authors: Huynh, Thuan Minh, Nguyen, Sura, Nguyen, Ngan Thi Kim, Nguyen, Huan Manh, Do, Noa Uy Pham, Nguyen, Danh Cong, Nguyen, Luong Huu, Nguyen, Cattien V
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 28.12.2020; MDPI
• Subjects: Carbon; Carbon nanotubes; Carbon sources; Catalysts; Chemical synthesis; Chemical vapor deposition; Chromium; Decomposition; Graphene; High temperature; Metal foils; Metal particles; Methane; Molybdenum; Nanoparticles; Nanotechnology; Nanotubes; Pretreatment; Raw materials; Scanning electron microscopy; semiconductor; Silicon wafers; Spectrum analysis; Stainless steels; stainless-steel foil catalyst; Steel; Vapors; Japan; stainless-steel foil catalyst; carbon nanotubes; semiconductor; chemical vapor deposition; pretreatment
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano11010050

Synthesis of carbon nanotubes (CNTs) was carried out using methane as a carbon source via the chemical vapor deposition (CVD) method. A thin stainless-steel foil was used as catalyst for CNT growth. Our results revealed that pretreatment step of the stainless-steel foil as a catalyst plays an important role in CNT formation. In our experiments, a catalyst pretreatment temperature of 850 °C or 950 °C was found to facilitate the creation of Fe- and Cr-rich particles are active sites on the foil surface, leading to CNT formation. It is noted that the size of metallic particles after pretreatment is closely related to the diameter of the synthesized CNTs. It is interesting that a shorter catalyst pretreatment brings the growth of semiconducting typed CNTs while a longer pretreatment creates metallic CNTs. This finding might lead to a process for improving the quality of CNTs grown on steel foil as catalyst.