Event
Public PhD defence of Cheng Chen on June 27
 
 

On June 27th 2024 at 09:30, Cheng Chen will defend their PhD entitled “NOVEL FABRICATION AND ELECTROMAGNETIC-OPTICAL CHARACTERIZATION TECHNIQUES OF CARBON-BASED NANOSTRUCTURES”.

Everybody is invited to attend the presentation in room D.2.01, or digitally via this link.

Abstract 

Nowadays, carbon nanomaterials are increasingly garnering attention as the next generation of semiconductor materials. Notably, graphene and carbon nanofibers (CNFs) have emerged as pivotal players in the semiconductor domain, owing to their remarkable electrical, mechanical, and thermal properties, coupled with their distinctive structural attributes.

Graphene, characterized by its two-dimensional single-layer structure of densely packed carbon atoms, boasts unparalleled electrical conductivity. This positions it for significant potential in applications like highfrequency electronic devices and sensors. Furthermore, its transparency and flexibility pave the way for innovative advancements in flexible electronic devices and display technologies, rejuvenating the electronics industry’s potential. CNFs, celebrated for their nanoscale diameter and exceptional mechanical attributes, carve a niche for themselves in material science. Their superior conductivity heralds vast opportunities, especially in realms such as conductive fibers and flexible circuitry. Within the spectrum of synthesis techniques, Chemical Vapor Deposition (CVD) emerges as a standout method, particularly for producing highquality graphene films and CNFs.

This dissertation delves into the CVD preparation, performance characterization, and subsequent applications of these materials, particularly in electromagnetic (EM) and ultraviolet (UV) optics. Specifically, the research encompasses:

  1. Investigating the photoluminescence (PL) performance of ZnO/graphene composite films and ZnO@CNFs composite fibers within the UV emission spectrum
  2. Determining the optimal thickness of ZnO in the ZnO/graphene composite for optimal UV-PL behavior
  3. Analyzing the anisotropic EM loss behavior of CNFs and ZnO@CNFs samples across the MMW and sub-terahertz bands
  4. Pioneering a novel quality-assessment method for wafer-scale CVDprepared graphene films, grounded in their distinctive interactions with terahertz TE10 waves

In essence, this research centers on graphene and CNFs, exploring their potential in the realm of EM and UV optics and offering insights based on their intrinsic properties.

 
 
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