Search Results
Fulleretic well-defined scaffolds: Donorāfullerene 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 metalādonorāfullerene framework, in which control of the donorāfullerene mutual orientation was achieved through chemical bond formation, in particular, by metal coordination. The 13C crossāpolarization magicāangle spinning NMR spectroscopy, Xāray diffraction, and timeāresolved fluorescence spectroscopy were performed for comprehensive structural analysis and energyātransfer (ET) studies of the fulleretic donorāacceptor 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 wellādefined fulleretic donorāacceptor 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.
Controllable sliding transfer of waferāsize 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 highāquality, waferāsize, and contaminationāfree graphene within a few seconds. Moreover, it can be extended to transfer other 2D materials. The efficient sliding transfer approach can obtain highāquality and largeāarea graphene for fundamental research and industrial applications.
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 selfāassemble, 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.
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 arcādischarge synthesis of MāTiācarbide clusterfullerenes (M=Y, Nd, Gd, Dy, Er, Lu). Optimization of the process parameters allows the synthesis of Dy2TiC@C80āI 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@C80āI are shown to be singleāmolecule magnets (SMM), but the presence of the second carbon atom in the cluster Dy2TiC2@C80 leads to substantially poorer SMM properties.
Stimuliāresponsive microjets with reconfigurable shape
2014, Magdanz, Veronika, Stoychev, Georgi, Ionov, Leonid, Sanchez, Samuel, Schmidt, Oliver.G.
Flexible thermoresponsive polymeric microjets are formed by the selfāfolding of polymeric layers containing a thin Pt film used as catalyst for selfāpropulsion 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 selfāpropulsion at the microscale, and also for biorelated applications.
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 straināinvariant sensors up to 30% tensile deformation.
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.
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 LiāO2 batteries. The combination of Pd and MnOx facilitates the transport of electrons, lithium ions, and oxygenācontaining 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.
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.
Mononuclear clusterfullerene singleāmolecule magnet containing strained fusedāpentagons 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, SuāYuan, Popov, Alexey A., Greber, Thomas, Yang, Shangfeng
Fusedāpentagons results in an increase of local steric strain according to the isolated pentagon rule (IPR), and for all reported nonāIPR clusterfullerenes multiple (two or three) metals are required to stabilize the strained fusedāpentagons, making it difficult to access the singleāatom properties. Herein, we report the syntheses and isolations of novel nonāIPR mononuclear clusterfullerenes MNC@C76 (M=Tb, Y), in which one pair of strained fusedāpentagon is stabilized by a mononuclear cluster. The molecular structures of MNC@C76 (M=Tb, Y) were determined unambiguously by singleācrystal Xāray diffraction, featuring a nonāIPR C2v(19138)āC76 cage entrapping a nearly linear MNC cluster, which is remarkably different from the triangular MNC cluster within the reported analogous clusterfullerenes based on IPRāobeying C82 cages. The TbNC@C76 molecule is found to be a fieldāinduced singleāmolecule magnet (SMM).