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THEMIS Pi2 observations near dawn and dusk sectors in the inner magnetosphere
Kwon, Hyuck-Jin,Kim, Khan-Hyuk,Lee, Dong-Hun,Takahashi, K.,Park, Young-Deuk,Bonnell, J.W. 한국우주과학회 2010 한국우주과학회보 Vol.19 No.1
The most frequently suggested source for Pi2 pulsations in the inner magnetosphere (L < 4) is standing fast-mode waves trapped in the plasmasphere (i.e., plasmaspheric resonances). They have been considered as the source of low-latitude Pi2 pulsations. Th
Air–Liquid Interfacial Self-Assembly of Conjugated Block Copolymers into Ordered Nanowire Arrays
Cativo, Ma. Helen M.,Kim, David K.,Riggleman, Robert A.,Yager, Kevin G.,Nonnenmann, Stephen S.,Chao, Huikuan,Bonnell, Dawn A.,Black, Charles T.,Kagan, Cherie R.,Park, So-Jung American Chemical Society 2014 ACS NANO Vol.8 No.12
<P>The ability to control the molecular packing and nanoscale morphology of conjugated polymers is important for many of their applications. Here, we report the fabrication of well-ordered nanoarrays of conjugated polymers, based on the self-assembly of conjugated block copolymers at the air–liquid interface. We demonstrate that the self-assembly of poly(3-hexylthiophene)-<I>block</I>-poly(ethylene glycol) (P3HT-<I>b</I>-PEG) at the air–water interface leads to large-area free-standing films of well-aligned P3HT nanowires. Block copolymers with high P3HT contents (82–91%) formed well-ordered nanoarrays at the interface. The fluidic nature of the interface, block copolymer architecture, and rigid nature of P3HT were necessary for the formation of well-ordered nanostructures. The free-standing films formed at the interface can be readily transferred to arbitrary solid substrates. The P3HT-<I>b</I>-PEG films are integrated in field-effect transistors and show orders of magnitude higher charge carrier mobility than spin-cast films, demonstrating that the air–liquid interfacial self-assembly is an effective thin film fabrication tool for conjugated block copolymers.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-12/nn505871b/production/images/medium/nn-2014-05871b_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn505871b'>ACS Electronic Supporting Info</A></P>
Exploiting Plasmon-Induced Hot Electrons in Molecular Electronic Devices
Conklin, David,Nanayakkara, Sanjini,Park, Tae-Hong,Lagadec, Marie F.,Stecher, Joshua T.,Chen, Xi,Therien, Michael J.,Bonnell, Dawn A. American Chemical Society 2013 ACS NANO Vol.7 No.5
<P>Plasmonic nanostructures can induce a number of interesting responses in devices. Here we show that hot electrons can be extracted from plasmonic particles and directed into a molecular electronic device, which represents a new mechanism of transfer from light to electronic transport. To isolate this phenomenon from alternative and sometimes simultaneous mechanisms of plasmon–exciton interactions, we designed a family of hybrid nanostructure devices consisting of Au nanoparticles and optoelectronically functional porphyin molecules that enable precise control of electronic and optical properties. Temperature- and wavelength-dependent transport measurements are analyzed in the context of optical absorption spectra of the molecules, the Au particle arrays, and the devices. Enhanced photocurrent associated with exciton generation in the molecule is distinguished from enhancements due to plasmon interactions. Mechanisms of plasmon-induced current are examined, and it is found that hot electron generation can be distinguished from other possibilities.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-5/nn401071d/production/images/medium/nn-2013-01071d_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn401071d'>ACS Electronic Supporting Info</A></P>
Electronic Transport in Porphyrin Supermolecule-Gold Nanoparticle Assemblies
Conklin, David,Nanayakkara, Sanjini,Park, Tae-Hong,Lagadec, Marie F.,Stecher, Joshua T.,Therien, Michael J.,Bonnell, Dawn A. American Chemical Society 2012 Nano letters Vol.12 No.5
<P>Temperature-dependent transport of hybrid structures consisting of gold nanoparticle arrays functionalized by conjugated organic molecules [(4′-thiophenyl)ethynyl-terminated <I>meso</I>-to-<I>meso</I> ethyne-bridged (porphinato)zinc(II) complexes] that possess exceptional optical and electronic properties was characterized. Differential conductance analysis distinguished the functional forms of the temperature and voltage dependences for a range of sample particles and molecular attachments. Thermally assisted tunneling describes transport for all cases and the associated mechanistic parameters can be used to determine the relative roles of activation energy, work function, and so forth. These results provide the basis on which to examine plasmon-influenced conduction in hybrid systems.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-5/nl300400a/production/images/medium/nl-2012-00400a_0004.gif'></P>
Magnetoresistance (MR) of twisted bilayer graphene on electron transparent substrate
Hong, S.J.,Rodriguez-Manzo, J.A.,Kim, K.H.,Park, M.,Baek, S.J.,Kholin, D.I.,Lee, M.,Choi, E.S.,Jeong, D.H.,Bonnell, D.A.,Mele, E.J.,Drndic, M.,Johnson, A.,Park, Y.W. Elsevier Sequoia] 2016 Synthetic metals Vol.216 No.-
We studied the magnetoresistance (MR) of twisted bilayer graphene (tBLG) on electron transparent substrate. Samples of tBLG were assembled on free-standing silicon nitride (SiN<SUB>x</SUB>) membranes (<100nm thick) by transferring chemical vapor deposition (CVD)-grown single layer graphene (SLG) twice; this allowed the measurement of the angle of rotation between the two layers, the twist angle, by electron diffraction using a transmission electron microscope (TEM). To compare with the previous reports on tBLG, we performed Raman spectroscopy on our samples. We measured the MR of tBLG for two different twist angles: 2<SUP>o</SUP> (small) and 18<SUP>o</SUP> (large). The MR showed superposition of two Shubnikov de Haas (SdH) oscillations for both angles. An analysis of the oscillation peaks by Landau fan diagrams showed difference as twist angle. While the large twist angle (18<SUP>o</SUP>) sample had two anomalous π Berry's phases, the small twist angle (2<SUP>o</SUP>) sample had conventional 2π and anomalous π Berry's phase depending on carrier density.
Martirez, John Mark P.,Kim, Seungchul,Morales, Erie H.,Diroll, Benjamin T.,Cargnello, Matteo,Gordon, Thomas R.,Murray, Christopher B.,Bonnell, Dawn A.,Rappe, Andrew M. American Chemical Society 2015 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.137 No.8
<P>In addition to composition, the structure of a catalyst is another fundamental determinant of its catalytic reactivity. Recently, anomalous Ti oxide-rich surface phases of ternary oxides have been stabilized as nonstoichiometric epitaxial overlayers. These structures give rise to different modes of oxygen binding, which may lead to different oxidative chemistry. Through density functional theory investigations and electrochemical measurements, we predict and subsequently show that such a TiO<SUB>2</SUB> double-layer surface reconstruction enhances the oxygen evolving activity of the perovskite-type oxide SrTiO<SUB>3</SUB>. Our theoretical work suggests that the improved activity of the restructured TiO<SUB>2</SUB>(001) surface toward oxygen formation stems from (i) having two Ti sites with distinct oxidation activity and (ii) being able to form a strong O–O moiety (which reduces overbonding at Ti sites), which is a direct consequence of (iii) having a labile lattice O that is able to directly participate in the reaction. Here, we demonstrate the improvement of the catalytic performance of a well-known and well-studied oxide catalyst through more modern methods of materials processing, predicted through first-principles theoretical modeling.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2015/jacsat.2015.137.issue-8/ja511332y/production/images/medium/ja-2014-11332y_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja511332y'>ACS Electronic Supporting Info</A></P>
Probing spin-charge relation by magnetoconductance in one-dimensional polymer nanofibers
Choi, A.,Kim, K. H.,Hong, S. J.,Goh, M.,Akagi, K.,Kaner, R. B.,Kirova, N. N.,Brazovskii, S. A.,Johnson, A. T.,Bonnell, D. A.,Mele, E. J.,Park, Y. W. American Physical Society 2012 Physical review. B, Condensed matter and materials Vol.86 No.15