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Molecular Motor-Powered Shuttles along Multi-walled Carbon Nanotube Tracks
Sikora, Aurex301,lien,Ramó,n-Azcox301,n, Javier,Kim, Kyongwan,Reaves, Kelley,Nakazawa, Hikaru,Umetsu, Mitsuo,Kumagai, Izumi,Adschiri, Tadafumi,Shiku, Hitoshi,Matsue, Tomokazu,Hwang, Wonmuk,T American Chemical Society 2014 NANO LETTERS Vol.14 No.2
<P>As a complementary tool to nanofluidics, biomolecular-based transport is envisioned for nanotechnological devices. We report a new method for guiding microtubule shuttles on multi-walled carbon nanotube tracks, aligned by dielectrophoresis on a functionalized surface. In the absence of electric field and in fluid flow, alignment is maintained. The directed translocation of kinesin propelled microtubules has been investigated using fluorescence microscopy. To our knowledge, this is the first demonstration of microtubules gliding along carbon nanotubes.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-2/nl4042388/production/images/medium/nl-2013-042388_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl4042388'>ACS Electronic Supporting Info</A></P>
Rossi, Daniel,Camacho-Forero, Luis E.,Ramos-Sax301,nchez, Guadalupe,Han, Jae Hyo,Cheon, Jinwoo,Balbuena, Perla,Son, Dong Hee American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.13
<P>Atomically thin layered transition metal dichalcogenides with highly anisotropic structure exhibit strong anisotropy in various material properties. Here, we report the anisotropic coupling between the interband optical transition and coherent acoustic phonon excited by ultrashort optical excitation in a colloidal solution of multilayered TiS2 nanodiscs. The transient absorption signal from the diameter- and thickness-controlled TiS2 nanodiscs dispersed in solution exhibited an oscillatory feature, which is attributed to the modulation of the interband absorption peak by the intralayer breathing mode. However, the signature of the interlayer acoustic phonon was not observed, while it has been previously observed in noncolloidal exfoliated sheets of MoS2. The dominance of the intralayer mode in modulating the interband optical transition was supported by the density functional theory (DFT) calculations of the optical absorption spectra of TiS2, which showed the stronger sensitivity of the interband absorption peak in the visible region to the in-plane strain than to the out-of-plane strain.</P>