Abstract:
:We perform density functional theory studies to investigate structural and electronic properties of the (5,5) boron nitride nanotubes (BNNTs) with surfaces and ends functionalized by thiol (SH) and hydroxyl (OH) groups. The exchange-correlation energies are treated according to the functional of Hamprecht-Cohen-Tozer-Handy within the generalized gradient approximation (HCTH-GGA). We use the base function with double polarization DNP. To determine the (5,5) BNNT-SH and (5,5) BNNT-OH relaxed structures the minimum energy criterion is applied considering six different geometries depending upon the SH and OH functional groups orientation: (C1) The adsorbed functional group is oriented toward the N atom, (C2) the functional group is oriented toward the B atom, (C3) the functional group is at the central hexagon of the BNNT surface. The (C4) fourth and (C5) fifth configurations are formed by allowing bonds (of S or O) with B or N atoms at one end of the nanotube. (C6) The sixth geometry is obtained by placing the functional group at the center of one end of the BNNT. The (5,5) BNNT-SH system, in vacuum, suffers a semiconductor to metal transition while the (5,5) BNNT-OH system retains the semiconductor behavior. When structures are solvated in water these systems behave as semiconductors. The polarity increases as a consequence of the functional group-nanotube interactions no matter if they are in vacuum or in solvation situation, which indicates the possible solubility and dispersion. According to the work function the best option to construct a device is with the BNNT-OH system.
journal_name
J Mol Modeljournal_title
Journal of molecular modelingauthors
Chigo Anota E,Cocoletzi GHdoi
10.1007/s00894-013-1782-3subject
Has Abstractpub_date
2013-06-01 00:00:00pages
2335-41issue
6eissn
1610-2940issn
0948-5023journal_volume
19pub_type
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