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Fakultätsübergreifendes Institut für Werkstofftechnik

headerphoto Fakultätsübergreifendes Institut für Werkstofftechnik

Univ.-Prof. Dr. Edda Rädlein


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Herz, Andreas ; Theska, Felix; Roßberg, Diana; Kups, Thomas; Wang, Dong; Schaaf, Peter
Solid-state dewetting of Au-Ni bi-layer films mediated through individual layer thickness and stacking sequence. - In: Applied surface science : a journal devoted to applied physics and chemistry of surfaces and interfaces. - Amsterdam : Elsevier, Bd. 444 (2018), S. 505-510

In the present work, the solid-state dewetting of Au-Ni bi-layer thin films deposited on SiO2/Si is systematically studied with respect to individual layer thickness and stacking sequence. For this purpose, a rapid heat treatment at medium temperatures is applied in order to examine void formation at the early stages of the dewetting. Compositional variations are realized by changing the thickness ratio of the bi-layer films, while the total thickness is maintained at 20 nm throughout the study. In the event of Au/Ni films annealed at 500 ˚C, crystal voids exposing the substrate are missing regardless of chemical composition. In reverse order, the number of voids per unit area in two-phase Au-Ni thin films is found to be governed by the amount of Au-rich material. At higher temperatures up to 650 ˚C, a decreased probability of nucleation comes at the expense of a major portion of cavities, resulting in the formation of bubbles in 15 nm Ni/5 nm Au bi-layers. Film buckling predominantly occurred at phase boundaries crossing the bubbles.
Zheng, Si-Xue ; Luo, Xue-Mei; Wang, Dong; Zhang, Guang-Ping
A novel evaluation strategy for fatigue reliability of flexible nanoscale films. - In: Materials Research Express : MRX. - Bristol : IOP Publ, ISSN 20531591, Bd. 5 (2018), 3, S. 035012, insges. 8 S.
Wang, Dong ; Schaaf, Peter
Plasmonic nanosponges. - In: Advances in Physics: X : APX. - Abingdon : Taylor & Francis Group, ISSN 23746149, Bd. 3Bd. 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
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