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Univ.-Prof. Dr. Edda Rädlein


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im Institut für Werkstofftechnik

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Wang, Dong ; Schaaf, Peter
Plasmonic nanosponges. - In: Advances in Physics: X : APX. - Abingdon : Taylor & Francis Group, ISSN 23746149, Bd. 3 (2018), 1, Article: 1456361, insges. 19 S.

Gold nanosponges, or nanoporous gold nanoparticles, possess a percolated nanoporous structure over the entire nanoparticles. The optical and plasmonic properties of gold nanosponges and its related hybrid nanosponges are very fascinating due to the unique structural feature, and are controllable and tuneable in a large scope by changing the structural parameters like pore/ligament size, porosity, particle size, particles form, and hybrid structure. The nanosponges show the strong polarization dependence and multiple resonances behavior. Besides, the nanosponges exhibit a significantly higher local field enhancement than the solid nanoparticles. Strong nonlinear optical properties are confirmed by their high-order photoemission behavior, whereby long-lived plasmon modes are also clearly observed. All this is very important and relevant for the applications in enhanced Raman scattering, fluorescence manipulation, sensing, and nonlinear photonics.
Yuan, Qian ; Döll, Joachim; Romanus, Henry; Wang, Hongmei; Bartsch, Heike; Albrecht, Arne; Hoffmann, Martin; Schaaf, Peter; Wang, Dong
Surface-nanostructured Al-AlN composite thin films with excellent broad-band antireflection properties fabricated by limited reactive sputtering. - In: ACS applied nano materials. - Washington, DC : ACS Publications, ISSN 25740970, Bd. 1 (2018), 3, S. 1124-1130

Al-AlN composite thin films with surface nanostructures possessing excellent broad-band antireflection properties can be simply fabricated by using a simple sputtering-based method, namely, limited reactive sputtering at elevated temperature. A mixture of Ar and N2 gases with limited gas flow of N2 is used. During the process, the limited amount of the N ions and radicals can only consume some of the sputtered Al atoms for the formation of AlN, so that the Al-AlN composite thin film can finally be deposited on the substrate. Compared to the traditional cosputtering for composite deposition, which works necessarily with two or more targets simultaneously, here only a single Al target is required. When the substrate temperature is higher than 100 &ring;C, surface nanostructures can be evolved because of the different diffusion kinetics of Al and AlN. The total reflection was reduced drastically (<10%) in the spectral range 300-2000 nm. The Al-AlN composite thin films exhibit also a good electric conductivity.
Kosinova, Anna; Wang, Dong; Schaaf, Peter; Sharma, Amit; Klinger, Leonid; Rabkin, EugenKosinova, Anna; Wang, Dong; Schaaf, Peter; Sharma, Amit; Klinger, Leonid; Rabkin, Eugen
Whiskers growth in thin passivated Au films. - In: Acta materialia. - Amsterdam [u.a.] : Elsevier Science, ISSN 13596454, Bd. 149 (2018), S. 154-163
Bund, Andreas ; Wiegmann, Christoph; Wolff, J.
Characterization and influence on the fatigue properties of the metal-turn-over of an electroless nickel coating on an AlCuMgFeNi alloy. - In: Journal for electrochemistry and plating technology : J.E.P.T. - Bad Saulgau : Leuze, ISSN 21960267, (2018), insges. 16 S.
Sen, Seema ; Lake, Markus; Schaaf, Peter
Experimental investigation of high temperature oxidation during self-propagating reaction in Zr/Al reactive multilayer films. - In: Surface and coatings technology. - Amsterdam [u.a.] : Elsevier Science, ISSN 02578972, Bd. 340 (2018), S. 66-73
Vidal, Cynthia ; Sivun, Dmitry; Ziegler, Johannes; Wang, Dong; Schaaf, Peter; Hrelescu, Calin; Klar, Thomas A.
Plasmonic horizon in gold nanosponges. - In: Nano letters : a journal dedicated to nanoscience and nanotechnology. - Washington, DC : ACS Publ, ISSN 15306992, Bd. 18 (2018), 2, S. 1269-1273

An electromagnetic wave impinging on a gold nanosponge coherently excites many electromagnetic hot-spots inside the nanosponge, yielding a polarization-dependent scattering spectrum. In contrast, a hole, recombining with an electron, can locally excite plasmonic hot-spots only within a horizon given by the lifetime of localized plasmons and the speed carrying the information that a plasmon has been created. This horizon is about 57 nm, decreasing with increasing size of the nanosponge. Consequently, photoluminescence from large gold nanosponges appears unpolarized.
Halbedel, Bernd ; Kazak, Oleg
Potenziale eines neuen Mahlverfahrens - die elektromechanische Zerkleinerung. - In: Chemie - Ingenieur - Technik : CIT. - Weinheim : Wiley-VCH Verl, ISSN 15222640, Bd. 90 (2018), 4, S. 540-551

Die elektromechanische Zerkleinerung (EMZ) hat aufgrund der Nutzung von hartmagnetischen Mahlkörpern und deren intensive Bewegung mit sich ändernden Magnetfeldern große Potenziale, nicht nur hohe Produktfeinheiten zu erzielen, sondern vor allem den Energiebedarf bei der Zerkleinerung signifikant zu senken. Zur Evaluierung dieser Potenziale wurden die Magnetfeldverteilung im Prozessraum simuliert, die Mahlkörperbewegung experimentell analysiert sowie Zerkleinerungsexperimente mit verschiedenen Materialien durchgeführt. Aus den Ergebnissen wurden Abhängigkeiten zur Auslegung von EMZ-Anlagen abgeleitet. (Electromechanical milling (EMZ) is the process of using intensively moving hard magnetic milling beads together with time variable and location variable magnetic fields. EMZ is an excellent milling method to use when extremely fine materials are required. An added benefit of EMZ is that energy consumption is significantly decreased. To evaluate the effectiveness of EMZ, we simulated the most effective magnet field distribution, we analyzed the milling bead movement, and we performed experiments with various materials. In this work, we discuss the results of our findings.)
Schoetz, Theresa ; Ponce de Leon, Carlos; Bund, Andreas; Ueda, Mikito
Electro-polymerisation and characterisation of PEDOT in Lewis basic, neutral and acidic EMImCl-AlCl3 ionic liquid. - In: Electrochimica acta : the journal of the International Society of Electrochemistry (ISE). - New York, NY [u.a.] : Elsevier, Bd. 263 (2018), S. 176-183
Im Titel ist "3" tiefgestellt
Sauerteig, Daniel ; Hanselmann, Nina; Arzberger, Arno; Reinshagen, Holger; Ivanov, Svetlozar; Bund, Andreas
Electrochemical-mechanical coupled modeling and parameterization of swelling and ionic transport in lithium-ion batteries. - In: Journal of power sources : the international journal on the science and technology of electrochemical energy systems. - New York, NY [u.a.] : Elsevier, ISSN 18732755, Bd. 378 (2018), S. 235-247
Dyck, Tobias ; Bund, Andreas
Design of contact systems under consideration of electrical and tribological properties. - In: IEEE transactions on components, packaging and manufacturing technology. - New York, NY : IEEE, ISSN 21563950, Bd. 8 (2018), 3, S. 427-438