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Multiwavelength Light-Responsive Au/B-TiO<sub>2</sub> Janus Micromotors
Jang, Bumjin,Hong, Ayoung,Kang, Ha Eun,Alcantara, Carlos,Charreyron, Samuel,Mushtaq, Fajer,Pellicer, Eva,Bux308,chel, Robert,Sort, Jordi,Lee, Sung Sik,Nelson, Bradley J.,Panex301,, Salvador American Chemical Society 2017 ACS NANO Vol.11 No.6
<P>Conventional photocatalytic micromotors are limited to the use of specific wavelengths of light due to their narrow light absorption spectrum, which limits their effectiveness for applications in biomedicine and environmental remediation. We present a multiwavelength light-responsive Janus micromotor consisting of a black TiO<SUB>2</SUB> microsphere asymmetrically coated with a thin Au layer. The black TiO<SUB>2</SUB> microspheres exhibit absorption ranges between 300 and 800 nm. The Janus micromotors are propelled by light, both in H<SUB>2</SUB>O<SUB>2</SUB> solutions and in pure H<SUB>2</SUB>O over a broad range of wavelengths including UV, blue, cyan, green, and red light. An analysis of the particles’ motion shows that the motor speed decreases with increasing wavelength, which has not been previously realized. A significant increase in motor speed is observed when exploiting the entire visible light spectrum (>400 nm), suggesting a potential use of solar energy, which contains a great portion of visible light. Finally, stop–go motion is also demonstrated by controlling the visible light illumination, a necessary feature for the steerability of micro- and nanomachines.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2017/ancac3.2017.11.issue-6/acsnano.7b02177/production/images/medium/nn-2017-02177v_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn7b02177'>ACS Electronic Supporting Info</A></P>
Burschka, Julian,Dualeh, Amalie,Kessler, Florian,Baranoff, Etienne,Cevey-Ha, Ngoc-Lex302,Yi, Chenyi,Nazeeruddin, Mohammad K.,Grax308,tzel, Michael American Chemical Society 2011 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.133 No.45
<P>Chemical doping is an important strategy to alter the charge-transport properties of both molecular and polymeric organic semiconductors that find widespread application in organic electronic devices. We report on the use of a new class of Co(III) complexes as p-type dopants for triarylamine-based hole conductors such as spiro-MeOTAD and their application in solid-state dye-sensitized solar cells (ssDSCs). We show that the proposed compounds fulfill the requirements for this application and that the discussed strategy is promising for tuning the conductivity of spiro-MeOTAD in ssDSCs, without having to rely on the commonly employed photo-doping. By using a recently developed high molar extinction coefficient organic D-π-A sensitizer and p-doped spiro-MeOTAD as hole conductor, we achieved a record power conversion efficiency of 7.2%, measured under standard solar conditions (AM1.5G, 100 mW cm<SUP>–2</SUP>). We expect these promising new dopants to find widespread applications in organic electronics in general and photovoltaics in particular.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2011/jacsat.2011.133.issue-45/ja207367t/production/images/medium/ja-2011-07367t_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja207367t'>ACS Electronic Supporting Info</A></P>
Laser Thinning for Monolayer Graphene Formation: Heat Sink and Interference Effect
Han, Gang Hee,Chae, Seung Jin,Kim, Eun Sung,Gux308,nesx327,, Fethullah,Lee, Il Ha,Lee, Sang Won,Lee, Si Young,Lim, Seong Chu,Jeong, Hae Kyung,Jeong, Mun Seok,Lee, Young Hee American Chemical Society 2011 ACS NANO Vol.5 No.1
<P>Despite the availability of large-area graphene synthesized by chemical vapor deposition (CVD), the control of a uniform monolayer graphene remained challenging. Here, we report a method of acquiring monolayer graphene by laser irradiation. The accumulation of heat on graphene by absorbing light, followed by oxidative burning of upper graphene layers, which strongly relies on the wavelength of light and optical parameters of the substrate, was <I>in situ</I> measured by the G-band shift in Raman spectroscopy. The substrate plays a crucial role as a heat sink for the bottom monolayer graphene, resulting in no burning or etching. Oscillatory thinning behavior dependent on the substrate oxide thickness was evaluated by adopting a simple Fresnel’s equation. This paves the way for future research in utilizing monolayer graphene for high-speed electronic devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2011/ancac3.2011.5.issue-1/nn1026438/production/images/medium/nn-2010-026438_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn1026438'>ACS Electronic Supporting Info</A></P>
Lee, Jiyoul,Chung, Jong Won,Kim, Do Hwan,Lee, Bang-Lin,Park, Jeong-Il,Lee, Sangyoon,Hä,usermann, Roger,Batlogg, Bertram,Lee, Sang-Soo,Choi, Insil,Kim, Il Won,Kang, Moon Sung American Chemical Society 2015 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.137 No.25
<P>We report the observation of band-like transport from printed polymer thin films at room temperature. This was achieved from donor-acceptor type thiophene-thiazole copolymer that was carefully designed to enhance the planarity of the backbone and the resulting transfer integral between the macromolecules. Due to the strong molecular interaction, the printed polymer film exhibited extremely low trap density comparable to that of molecular single crystals. Moreover, the energy barrier height for charge transport could be readily reduced with the aid of electric field, which led formation of extended electron states for band-like charge transport at room temperature.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2015/jacsat.2015.137.issue-25/jacs.5b04253/production/images/medium/ja-2015-04253w_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja5b04253'>ACS Electronic Supporting Info</A></P>
Usta, Hakan,Kim, Dojeon,Ozdemir, Resul,Zorlu, Yunus,Kim, Sanghyo,Ruiz Delgado, M. Carmen,Harbuzaru, Alexandra,Kim, Seonhyoung,Demirel, Gox308,khan,Hong, Jongin,Ha, Young-Geun,Cho, Kilwon,Facchetti, American Chemical Society 2019 Chemistry of materials Vol.31 No.14
<P>The first example of an n-type [1]benzothieno[3,2-<I>b</I>][1]benzothiophene (BTBT)-based semiconductor, <B>D(Ph</B><SUB><B>F</B></SUB><B>CO)-BTBT</B>, has been realized via a two-step transition-metal-free process without using chromatographic purification. Physicochemical and optoelectronic characterizations of the new semiconductor were performed in detail, and the crystal structure was accessed. The new molecule exhibits a large optical band gap (∼2.9 eV) and highly stabilized (Δ<I>E</I><SUB>LUMO</SUB> = 1.54 eV)/π-delocalized lowest unoccupied molecular orbital (LUMO) mainly comprising the BTBT π-core and in-plane carbonyl units. The effect of out-of-plane twisted (64°) pentafluorophenyl groups on LUMO stabilization is found to be minimal. Polycrystalline <B>D(Ph</B><SUB><B>F</B></SUB><B>CO)-BTBT</B> thin films prepared by physical vapor deposition exhibited large grains (∼2-5 μm sizes) and “layer-by-layer” stacked edge-on oriented molecules with an in-plane herringbone packing (intermolecular distances ∼3.25-3.46 Å) to favor two-dimensional (2D) source-to-drain (S → D) charge transport. The corresponding TC/BG-OFET devices demonstrated high electron mobilities of up to ∼0.6 cm<SUP>2</SUP>/V·s and <I>I</I><SUB>on</SUB>/<I>I</I><SUB>off</SUB> ratios over 10<SUP>7</SUP>−10<SUP>8</SUP>. These results demonstrate that the large band gap BTBT π-core is a promising candidate for high-mobility n-type organic semiconductors and, combination of very large intrinsic charge transport capabilities and optical transparency, may open a new perspective for next-generation unconventional (opto)electronics.</P> [FIG OMISSION]</BR>