New synthesis and physical property of low resistivity boron-doped multi-walled carbon nanotubes

Effect of boron concentration on physicochemical properties of boron-doped carbon nanotubes

“…The size of the peaks were observed to broaden (Fig. 5) with increased boron concentration and this is also reported in literature [34]. Increased peak sizes with boron concentration could be due to increased defects and also, high concentration of B-CNF as observed in TEM images.…”

“…Shift of the G-band to higher wavelength was attributed to substitution of carbon from its network by boron [34]. In all the samples D 0 -band was observed (Table 3 and Fig.…”

Electrical properties of boron-doped MWNTs synthesized by hot-filament chemical vapor deposition

“…Meanwhile, the full-width at half maximum (FWHM) of the G bands in the nondoped and boron-doped MWNTs were 51 and 48 cm À1 , respectively. The FWHM of the G band was changed little by the borondoping and lower than that of the boron-doped MWNTs synthesized by the thermal CVD using the same source solution [4,5]. The FWHM of the G band may be attributed to the inhomogeneity of the boron concentration in the MWNTs [4,5], and therefore the hot-filament CVD technique might distribute the boron more homogeneously over the MWNTs compared to the thermal CVD.…”

“…An Si substrate covered with thermally grown SiO 2 (500 nm thick) was placed within 1 mm below the filament. Before the growth, the surface of the substrate was coated with an Al layer (5 nm thick) by thermal evaporation, and then coated with an iron acetate by dipping followed by heating at 400°C for 5 min [3][4][5]9]. When the voltage was applied to the filament, the source solution in the To evaluate the electrical properties, the temperature dependence of resistivity was measured from room temperature down to 2 K. For accurate measurement, a four-terminal method was performed with metal electrodes, which were fabricated on an individual target MWNT by electron beam lithography [3].…”

Enhanced nerve cell proliferation and differentiation on electrically conductive scaffolds embedded with graphene and carbon nanotubes

“…As a result, conductive materials have attracted increasing attention in nerve tissue engineering to enhance neural tissue regeneration. Graphene and carbon nanotubes (CNTs) are most widely used as conductive materials because of their excellent mechanical property, electrical and thermal conductivity, and biocompatibility (Ando, Zhao, Shimoyama, Sakai, & Kaneto, 1999; Hong & Hwang, 2008; Ishii et al, 2008; Kim, Park, & Lee, 2011; Mombeshora, Ndungu, Jarvis, & Nyamori, 2018; Ryoo, Kim, Kim, & Min, 2010; Szelag, 2017; Treacy, Ebbesen, & Gibson, 1996; Zhang et al, 2010). In recent years, CNTs were widely applied for conduits development aiming at nerve regeneration (Ahn et al, 2015; Kabiri et al, 2015; Liu, Kim, Miller, Waletzki, & Lu, 2018; Wang et al, 2017; Zhou et al, 2018).…”