Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 62: Direct-Write Nanofabrication and Applications III
(Electron Beam Induced Processing) (joint session DS/TT)
TT 62.2: Vortrag
Donnerstag, 4. April 2019, 15:30–15:45, H32
Ac conductivity of nano-granular metals prepared via FEBID — •Marc Hanefeld1, Michael Huth1, Joshua Gies2, and Martin Kind2 — 1Physikalisches Institut, Goethe Universität, Max-von-Laue-Str. 1 — 2Institut für Anorg. und Analyt. Chemie, Goethe Universität, Max-von-Laue-Str. 7, 60438 Frankfurt a. M., Germany
Focused Electron Beam Induced Deposition (FEBID) is a versatile technique to create nano-granular metals with tunable electronic transport properties [1]. In granular metals metallic nanoparticles are surrounded by a dielectric matrix which leads to a transport mechanism based on thermally assisted tunnelling. This opens up promising possibilities for sensing applications [1] and has triggered ongoing research concerning their response to a time-dependant ac stimulus [2].
Current research focuses mainly on two different material properties, namely an apparent universal power law and a temperature-independent scaling behaviour in the real part of the complex ac conductivity, both present in many disordered solids and recently reported in granular metals of palladium in zirconia [2].
We present recent results on the ac conductance response of nano-granular Pt(C)-FEBID deposits and show the capabilities of FEBID to create an ideal model environment for an in depth analysis of the ac conduction characteristics of granular metals. Possible applications of these results in dielectric sensors combining nano-granular Pt(C) with metal-organic frameworks will be discussed.
[1] Huth, et al., Microelect. Eng. 2017. doi:10.1016/j.mee.2017.10.012.
[2] Bakkali, et al., Sci. Rep. 2016;6:29676. doi:10.1038/srep29676.