Nanometrology

Focus Field: Industrial Metrology

Interface energetics and light-matter interaction of molecular layers on semiconductors and functionalized nano templates

Focus: 
Nanometrology

Organic molecules will be used to functionalize two-dimensional oxide templates and semiconductor surfaces. Such tailored surfaces and interfaces have large significance for surface passivation, bio-sensing and nanoelectronics applications. In this context understanding and controlling the transfer of electrical charges across the interface and as well as light-matter interaction of inserted molecules in the array is of fundamental importance.

Mentor/s: 
Lemmens
Mentor/s: 
Tornow
Institution: 
PTB
Institution: 
TU Braunschweig
Status: 
in progress
Ph.D. student: 
Pathak

Epitaxy and the characterization of core-shell GaN columnar light-emitting Diodes

Focus: 
Nanometrology

Three dimensional (3D) GaN nanorods or microcolumns have recently gained increased attention for applications in optoelectronic and electronic devices. This is due to the low defect density and reduced influence of lattice and thermal mismatch to the substrate. In comparison to conventional planar light emitting diodes (LEDs), the active region of 3D column LED systems can be much larger when using a core-shell geometry with high aspect ratio. A further advantage is that the InGaN/GaN multi quantum wells (MQWs) mainly grow defect free on non-polar m-plane side walls.

Mentor/s: 
Waag
Institution: 
TU Braunschweig
Status: 
completed
Ph.D. student: 
Wang

Light-matter interaction of molecules in nanoscale templates (spectroscopy and preparation - focus on optical experiments)

Focus: 
Nanometrology

Two-dimensional templates with periodic pores and length scales in the nanometer range can be prepared in a self-organized way using electrochemical approaches. Such materials allow investigation and manipulation of light-matter interaction of inserted molecules and their array. In the proposed thesis, arrays based on anodized aluminium and porous silicon will be investigated and optimized with respect to fluorescence dynamics and enhanced Raman scattering cross section.

Mentor/s: 
Lemmens
Institution: 
TU Braunschweig
Status: 
completed
Ph.D. student: 
Cetin

AFM as sensor to detect translation and rotation

Focus: 
Nanometrology

AFM are high resolution microscopes, which are able to achieve atomic resolution on crystalline surfaces. Up to now these microscopes only are used to investigate technical surface and to measure surface features, like steps, lines, periodical pattern, the roughness, and others with high resolution. Limits are related to the precise characterization of the tip shape.

Mentor/s: 
Härtig
Mentor/s: 
Koenders
Mentor/s: 
Schilling
Institution: 
PTB
Institution: 
TU Braunschweig
Status: 
completed
Ph.D. student: 
Chen

Synthesis and characterization of magnetic iron oxide nanoparticles

Focus: 
Nanometrology

New diagnostic tools for medical applications and bioanalysis can be realized by magnetic nanoparticles from iron oxide.

Mentor/s: 
Schilling
Institution: 
TU Braunschweig
Status: 
completed
Ph.D. student: 
Lak

Meso-porose surfaces as template materials

Focus: 
Nanometrology

Meso- and nano-porose surfaces with length scale in the 10-200nm regime are important in surface chemistry, physics and biology due to their interesting properties as catalyst, functionalized template material and geometrically and electronically confining agent. In this thesis it is planned to use meso- and nano-porose surfaces as self-organized template materials for sensing applications and to control and enhance optical activity/polarizability.

Mentor/s: 
Lemmens
Institution: 
TU Braunschweig
Status: 
completed
Ph.D. student: 
Yan
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