DESY, with its 2700 employees at its two locations in Hamburg and Zeuthen, is one of the world's leading research centres. Its research focuses on decoding the structure and function of matter, from the smallest particles of the universe to the building blocks of life. In this way, DESY contributes to solving the major questions and urgent challenges facing science, society and industry. With its ultramodern research infrastructure, its interdisciplinary research platforms and its international networks, DESY offers a highly attractive working environment in the fields of science, technology and administration as well as for the education of highly qualified young scientists.

Research Goal

Colloidally grown CdSe nanowires (NWs) may serve as templates for the synthesis of metallic Ag2Se NWs via cation exchange. A detailed knowledge of the exchange kinetics and the spatial distribution of the silver ions is essential when designing opto-electronic devices. Thus, Ag2xCd1-xSe NWs were investigated after sequential exchange steps using X-ray fluorescence (XRF) at the scanning X-ray microscope P06 at DESY. The preliminary visualization of the elemental distribution rendered promising results: for the first time, we could detect all involved ions.

However, a comprehensive analysis comprising a sophisticated fitting procedure is still lacking. Especially the analysis of the silver dopant introduced during the initial exchange steps requires customized algorithms for a quantitative analysis of the chemical processes at the nanoscale.

Tasks

• Analysis of pre-existing data with respect to the elemental distribution in Ag2xCd1-xSe NWs upon cation exchange
• Comparison of different fitting methods and development / refinement of a Python-based procedure
• Correlation of the X-ray microscopy data with supplementary data from laboratory-based measurements (SEM, AFM)
• Participation at synchrotron beamtimes
• Scientific presentation of the results

If you are interested in the project, don't hesitate to write us an email or talk to us after lectures.

 

Conditions

Begin: Anytime
Program: Physics, CiS, Nanoscience
Where: DESY
Remote-office regulations may apply, according to the current COVID-19 situation
Language: German, English

Contact
Dr. Michael Stückelberger

michael.stueckelberger@desy.de
DESY Photon Science
Bldg. 25f, Room L462 - Notkestr. 85, D-22607 Hamburg

Kontakt

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