Synthesis of boron nitride nanotubes at low temperatures using reactive ball milling

Frequency-Dependent Polarizability of Boron Nitride Nanotubes: A Theoretical Study

“…In addition, from a simple additive perspective, the polarizability is smaller for borazine than for benzene mainly because of that R N is smaller than R C . Table 2 presents both theoretical and experimental results for the frequency-dependent mean polarizability of C 60 . Recently, frequency-dependent linear response calculations of the polarizability of C 60 using a Hartree-Fock reference wave function yielded a polarizability of 75.1 Å 3 , 30 which is in good agreement with the experimental static polarizability of 76.5 ( 8 Å 3 .…”

“…39 Also, the experimental frequency-dependent polarizability of 79.4 ( 4 Å 340 is in good agreement with the theoretical result of 76.4 Å 3 . 30 However, due to the large experimental uncertainty, no definite conclusion can be drawn based on experiments concerning the dispersion of the polarizability of C 60 . From Table 2, it is seen that the IM results of 77.5 Å 3 for the static polarizability and 78.2 Å 3 for the frequency-dependent polarizability are in excellent agreement with both the SCF results and the experimental values, and they also provide the same trends as the SCF calculations with respect to the frequency dependence.…”

“…The linear and nonlinear optical response properties for fullerenes [24][25][26][27][28][29][30][31] and single-walled C-NTs [11][12][13][14][15][16][17][18][19] have been studied extensively by theoretical means. Response properties of the fullerenes C 60 and C 70 have also been studied in quite some detail experimentally. 32,25,[33][34][35][36][37][38][39][40] However, only a few experimental studies of optical response properties of C-NTs have been reported.…”

“…Substitution of carbon with boron and nitrogen have been carried out, producing boron-, nitrogen-, and boron-nitrogen-doped carbon nanotubes [41][42][43][44][45][46][47][48][49] and totally substituted boron nitride nanotubes (BN-NTs). 46,47,[50][51][52][53][54][55][56][57][58][59][60][61][62] The structure of these new boronnitrogen-containing fullerenes and nanotubes have been studied and compared with that of carbon nanotubes. [63][64][65][66][67][68][69][70][71][72][73][74][75][76] In particular, it has been noted that BN-NTs have an almost constant band gap of 5.5 eV with respect to the geometric configuration of the tube whereas the band gap of carbon nanotubes show a strong geometry dependence.…”

“…[63][64][65][66][67][68][69][70][71][72][73][74][75][76] In particular, it has been noted that BN-NTs have an almost constant band gap of 5.5 eV with respect to the geometric configuration of the tube whereas the band gap of carbon nanotubes show a strong geometry dependence. 67 The effects of doping C 60 -based C-NTs 77 and the fullerene C 60 78,79 with boron and nitrogen on the second hyperpolarizability, γ, have been reported. These studies show that doping enlarges γ by several orders of magnitude compared to that of the pure fullerene and C-NTs, suggesting B-, N-, and BN-doped C-NTs as well as pure BN-NTs as serious candidates for photonic devices.…”