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Fulleretic well-defined scaffolds: Donorā€“fullerene alignment through metal coordination and its effect on photophysics

2016, Williams, Derek E., Dolgopolova, Ekaterina A., Godfrey, Danielle C., Ermolaeva, Evgeniya D., Pellechia, Perry J., Greytak, Andrew B., Smith, Mark D., Avdoshenko, Stanislav M., Popov, Alexey A., Shustova, Natalia B.

Herein, we report the first example of a crystalline metalā€“donorā€“fullerene framework, in which control of the donorā€“fullerene mutual orientation was achieved through chemical bond formation, in particular, by metal coordination. The 13C crossā€polarization magicā€angle spinning NMR spectroscopy, Xā€ray diffraction, and timeā€resolved fluorescence spectroscopy were performed for comprehensive structural analysis and energyā€transfer (ET) studies of the fulleretic donorā€“acceptor scaffold. Furthermore, in combination with photoluminescence measurements, the theoretical calculations of the spectral overlap function, Fƶrster radius, excitation energies, and band structure were employed to elucidate the photophysical and ET processes in the prepared fulleretic material. We envision that the wellā€defined fulleretic donorā€“acceptor materials could contribute not only to the basic science of fullerene chemistry but would also be used towards effective development of organic photovoltaics and molecular electronics.

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Controllable sliding transfer of waferā€size graphene

2016, Lu, Wenjing, Zeng, Mengqi, Li, Xuesong, Wang, Jiao, Tan, Lifang, Shao, Miaomiao, Han, Jiangli, Wang, Sheng, Yue, Shuanglin, Zhang, Tao, Hu, Xuebo, Mendes, Rafael G., RĆ¼mmeli, Mark H., Peng, Lianmao, Liu, Zhongfan, Fu, Lei

The innovative design of sliding transfer based on a liquid substrate can succinctly transfer highā€quality, waferā€size, and contaminationā€free graphene within a few seconds. Moreover, it can be extended to transfer other 2D materials. The efficient sliding transfer approach can obtain highā€quality and largeā€area graphene for fundamental research and industrial applications.

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Biomimetic microelectronics for regenerative neuronal cuff implants

2015, Karnaushenko, Daniil, MĆ¼nzenrieder, Niko, Karnaushenko, Dmitriy D., Koch, Britta, Meyer, Anne K., Baunack, Stefan, Petti, Luisa, Trƶster, Gerhard, Makarov, Denys, Schmidt, Oliver G.

Smart biomimetics, a unique class of devices combining the mechanical adaptivity of soft actuators with the imperceptibility of microelectronics, is introduced. Due to their inherent ability to selfā€assemble, biomimetic microelectronics can firmly yet gently attach to an inorganic or biological tissue enabling enclosure of, for example, nervous fibers, or guide the growth of neuronal cells during regeneration.

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Methane as a selectivity booster in the arc-discharge synthesis of endohedral fullerenes: Selective synthesis of the single-molecule magnet Dy2TiC@C80and Its Congener Dy2TiC2@C80

2015, Junghans, Katrin, Schlesier, Christin, Kostanyan, Aram, Samoylova, Nataliya A., Deng, Qingming, Rosenkranz, Marco, Schiemenz, Sandra, Westerstrƶm, Rasmus, Greber, Thomas, BĆ¼chner, Bernd, Greber, Thomas, Popov, Alexey A.

The use of methane as a reactive gas dramatically increases the selectivity of the arcā€discharge synthesis of Mā€Tiā€carbide clusterfullerenes (M=Y, Nd, Gd, Dy, Er, Lu). Optimization of the process parameters allows the synthesis of Dy2TiC@C80ā€I and its facile isolation in a single chromatographic step. A new type of cluster with an endohedral acetylide unit, M2TiC2@C80, is discovered along with the second isomer of M2TiC@C80. Dy2TiC@C80ā€(I,II) and Dy2TiC2@C80ā€I are shown to be singleā€molecule magnets (SMM), but the presence of the second carbon atom in the cluster Dy2TiC2@C80 leads to substantially poorer SMM properties.

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Stimuliā€responsive microjets with reconfigurable shape

2014, Magdanz, Veronika, Stoychev, Georgi, Ionov, Leonid, Sanchez, Samuel, Schmidt, Oliver.G.

Flexible thermoresponsive polymeric microjets are formed by the selfā€folding of polymeric layers containing a thin Pt film used as catalyst for selfā€propulsion in solutions containing hydrogen peroxide. The flexible microjets can reversibly fold and unfold in an accurate manner by applying changes in temperature to the solution in which they are immersed. This effect allows microjets to rapidly start and stop multiple times by controlling the radius of curvature of the microjet. This work opens many possibilities in the field of artificial nanodevices, for fundamental studies on selfā€propulsion at the microscale, and also for biorelated applications.

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Direct transfer of magnetic sensor devices to elastomeric supports for stretchable electronics

2015, Melzer, Michael, Karnaushenko, Daniil, Lin, Gungun, Baunack, Stefan, Makarov, Denys, Schmidt, Oliver G.

A novel fabrication method for stretchable magnetoresistive sensors is introduced, which allows the transfer of a complex microsensor systems prepared on common rigid donor substrates to prestretched elastomeric membranes in a single step. This direct transfer printing method boosts the fabrication potential of stretchable magnetoelectronics in terms of miniaturization and level of complexity, and provides strainā€invariant sensors up to 30% tensile deformation.

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Chemotactic behavior of catalytic motors in microfluidic channels

2013, Baraban, Larysa, Harazim, Stefan M., Sanchez, Samuel, Schmidt, Oliver.G.

Chemotaxis in practice: Two different artificial catalytic micromotors (tubular and spherical, see scheme) show chemotactic behavior in microfluidic channels demonstrating that catalytic micromotors can sense the gradient of chemical fuel in their environment and be directed towards desired locations.

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High-performance Li-O2 batteries with trilayered Pd/MnOx/Pd nanomembranes

2015, Lu, Xueyi, Deng, Junwen, Si, Wenping, Sun, Xiaolei, Liu, Xianghong, Liu, Bo, Liu, Lifeng, Oswald, Steffen, Baunack, Stefan, Grafe, Hans Joachim, Yan, Chenglin, Schmidt, Oliver G.

Trilayered Pd/MnOx/Pd nanomembranes are fabricated as the cathode catalysts for Liā€O2 batteries. The combination of Pd and MnOx facilitates the transport of electrons, lithium ions, and oxygenā€containing intermediates, thus effectively decomposing the discharge product Li2O2 and significantly lowering the charge overpotential and enhancing the power efficiency. This is promising for future environmentally friendly applications.

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Wearable magnetic field sensors for flexible electronics

2014, Melzer, Michael, Mƶnch, Jens Ingolf, Makarov, Denys, Zabila, Yevhen, BermĆŗdez, Gilbert Santiago CaĆ±Ć³n, Karnaushenko, Daniil, Baunack, Stefan, Bahr, Falk, Yan, Chenglin, Kaltenbrunner, Martin, Schmidt, Oliver G.

Highly flexible bismuth Hall sensors on polymeric foils are fabricated, and the key optimization steps that are required to boost their sensitivity to the bulk value are identified. The sensor can be bent around the wrist or positioned on the finger to realize an interactive pointing device for wearable electronics. Furthermore, this technology is of great interest for the rapidly developing market of Ā­eMobility, for optimization of eMotors and magnetic bearings.

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Mononuclear clusterfullerene singleā€molecule magnet containing strained fusedā€pentagons stabilized by a nearly linear metal cyanide cluster

2017, Liu, Fupin, Wang, Song, Gao, Cong-Li, Deng, Qingming, Zhu, Xianjun, Kostanyan, Aram, WesterstrƧm, Rasmus, Jin, Fei, Xie, Suā€Yuan, Popov, Alexey A., Greber, Thomas, Yang, Shangfeng

Fusedā€pentagons results in an increase of local steric strain according to the isolated pentagon rule (IPR), and for all reported nonā€IPR clusterfullerenes multiple (two or three) metals are required to stabilize the strained fusedā€pentagons, making it difficult to access the singleā€atom properties. Herein, we report the syntheses and isolations of novel nonā€IPR mononuclear clusterfullerenes MNC@C76 (M=Tb, Y), in which one pair of strained fusedā€pentagon is stabilized by a mononuclear cluster. The molecular structures of MNC@C76 (M=Tb, Y) were determined unambiguously by singleā€crystal Xā€ray diffraction, featuring a nonā€IPR C2v(19138)ā€C76 cage entrapping a nearly linear MNC cluster, which is remarkably different from the triangular MNC cluster within the reported analogous clusterfullerenes based on IPRā€obeying C82 cages. The TbNC@C76 molecule is found to be a fieldā€induced singleā€molecule magnet (SMM).