Adress: Arnold-Sommerfeld-Str. 4, D-38678 Clausthal-Zellerfeld (Building C8)

Phone: outside Univertity dial +49(0)5323/72- first

E-Mail: please klick on the names. E-Mail adresse are build like the following:



Sabrina Kühnemund

Room: 141, Phone: 2584

Visiting lecturers

Prof. Dr. Lothar Dunemann

Please contact the office.

more information

Scientific staff

Dr. Christian Gutsche

Room: 143, Phone: 3511

Bachelor of science in physics and biology (2005 - 2009, University of Bremen), master of science in physics (2009 - 2011, University of Bremen, University of Oldenburg, Helmholtz Centre Berlin, scholarship from Rosa Luxemburg Stiftung), masther thesis in the field of solar cells, Ph.D. in the field of batteries ("Electrochemical Stability of Noble Metal-Based Nanoparticles as Catalysts for Oxygen Reduction and Evolution for Vanadium-Air Redox Flow Batteries", 2012-2015, University of Oldenburg, magna cum laude, funded by scholarships of "Stiftung der Metall-Industrie im Nordwesten" and Reiner Lemoine-Stiftung). Postdoc in battery research (2015-2018, University of Oldenburg).

Working in the Fittschen group since September 2018. Main research interests are: X-ray spectroscopy, electrochemistry, batteries, nanoparticles, XPS, XRD, TEM, SEM.

more information on Christian Gutsche

Dr. Christian Stoltenberg

Room: 143, Phone: 3511

Studied chemistry and did his Ph.D at Kiel University in inorganic chemistry. 2015 to 2017 he was teaching at Europa-Universität Flensburg within the Department of Chemistry and its teaching methods.

Started in 2017 in the work group.

Sebastian Böttger

Room: 143, Phone: 3511

Bachelor degree (Bachelor of Arts in Science of the Communication and Teaching of Knowledge) and Master degree (Master of Education Teaching in common schools (Chemistry and Protestant Theology)) were received from Universität Flensburg and Europa-Universität Flensburg, respectively. 2015 to 2018 he was teaching at Europa-Universität Flensburg within the Department of Chemistry and its teaching methods. Since September 2018 at TU Clausthal.

Since summer 2016 he is PhD student in the work group. He was a Visiting Scholar at Washington State University at that time.

His research focusses on the determination of gas phase mercury. Mercury compounds were often used to prevent cultural heritage specimens from damage, e.g. herbaria and paintings. HgCl2 was mostly used for the preservation. Over time, Hg0 is formed by bacterial activity and released into the air. Mercury in the gas phase is toxic for humans. Accordingly, access to archives may need to be controlled because of the hazard originating from high Hg gas phase concentrations. Our aim is to develop a reliable and accurate analysis of airborne Hg using a small footprint and efficient micro-analytical tool already available in many laboratories. We decided on a procedure to enrich the airborne mercury on silver nanoparticles (AgNPs) and determine its concentration by using TXRF (Total-X-ray-fluorescence spectroscopy).

Christian Lutz

Room: 145, Phone: 3642

Received his bachelor degree in Applied Chemistry from FH Aachen - University of Applied Sciences, his master degree in Analytical Chemistry and Quality Assurance from Hochschule Bonn-Rhein-Sieg - University of Applied Sciences. This thesis was about "Quantitative Element Determination in Carbon Fibre Resin Plastics" and was done at the Bundeswehr Research Institute for Materials, Fuels and Lubricants in Erding.

Since december 2017 he is as a PhD student part of the group, focussing on elemental determination and speciation in Vanadium-Redox-Flow-Batteries.

Alena Wittkowski

Room: 145, Phone: 3642

Bachelor and Master degree in Applied Chemistry were received from Clausthal University of Technology. The master thesis was done at the Institute of Non-Metallic Materials in cooperation with Fels Werke GmbH and dealt with the investigation of the mode of action of methylcellulose in agglomerated mortars and its impact on the stability.

Since october 2017 she is PhD student in the Fittschen group. Her research focusses on the speciation of manganese in non-crystalline phases of slag originating from the recycling of lithium-ion batteries.

Sven Hampel

Room: 126, Phone: 2898

Bachelor degree in chemistry was received from Clausthal University of Technology. The bachelor thesis called "Aromatic phosphonates as covalently bonded flame retardent for wood" was done at the Institute of Organic Chemistry. Now working on his masters degree in chemistry with in the field of "applied chemistry" at Clausthal University of Technology.

Since January 2019 he's part of the group working on his master thesis.



Jessica Hiller

Room: 143, Phone: 3642

Jessica is currently working on her master thesis.

Heiko Sebastian Till

Room: 136, Phone: 3551

Heiko is currently working on his master thesis.

Technical staff

Petra Lassen

Room: 147, Phone: 3321

Visited the school for chemical technical assistants in Brunswick, further qualification as a sideline as technician in chemistry in Hamburg. Started at Clausthal University in 1989 in the work group Analytical Chemistry.

Focused on instrumental analytics, especially sprectrometrical and chromatographical methods. In particular, she is optimizing methods and improving sample preparations. Also, she is working with students during lab courses and doing courses for school students.

Tanja Wittig

Room: 136, Phone: 3551

Chemical technical assistant, started in 2018 in the work group.


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