In-situ TEM observations of the structural stability in carbon nanotubes, nanodiamonds and carbon nano-onions under electron irradiation. (15th June 2022)

• Record Type: Journal Article
• Authors: Lin, Zhaoyun; Shao, Gang; Liu, Wen; Wang, Yiguang; Wang, Hailong; Wang, Hailiang; Fan, Bingbing; Lu, Hongxia; Xu, Hongliang; Zhang, Rui
• Is Part Of: Carbon. Volume 192(2022)
• Page Start: 356
• Page End: 365
• Publication Date: 2022-06-15
• Subjects: In-situ transmission electron microscopy (TEM) -- Irradiation stability -- Multi-wall carbon nanotubes (MWCNTs) -- Carbon nano-onions (CNOs) -- Nanodiamonds (NDs); Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2022.02.079
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: The dynamic transformations and damage behavior of free-standing multi-wall carbon nanotubes (MWCNTs), carbon nano-onions (CNOs), as well as nanodiamonds (NDs) are systematically studied by carrying out in-situ transmission electron microscope (TEM) measurements. Three key factors, including sp 2 - sp 3 hybrid, inherent defects and morphology, are employed in order to deeply explore the disordering or the graphitization process in this work. On top of that, by applying fluence calculations, interplanar spacing measurements and inverse fast-Fourier-transformations, the structural evolutions of the carbon nanomaterials are precisely described. Interestingly, under the enforcement of high dose (up to 26.98 × 10 24 e/cm 2 ) and current density (1.66 × 10 3 and 3.79 × 10 3 A/cm 2 ), we discovered that the NDs and CNOs with ∼10 nm average diameter presented better structural stability than the MWCNTs. The structural transition in NDs undergoes 4 stages, whereas NDs turn into the defective CNOs finally. By comparing the defective and the perfect CNOs and CNTs, the existence of inherent defects in the material leads to the degeneration of the stability under irradiation of 5.59 × 10 24 e/cm 2 . In addition, the direction of the defect migration can be changed by the empty internal space, which is ultimately imposed by irradiation-induced pressure in the carbon nanostructures. Graphical abstract: Image 1 Highlights: Damage dynamics of the MWCNTs, NDs and CNOs studied by in-situ TEM. High sp 3 carbon structure is translated into sp 2 hybrid structure by irradiation. NDs and CNOs with ∼10 nm size illustrates enhanced stability than MWCNTs. The empty internal space in carbon nanostructures can change the defect movement. Irradiation-induced pressure is a key factor for defecting the migration direction.