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LOCATION:ICFO Auditorium and Online (Teams)
SUMMARY:ICFO | CHRISTINA GRAHAM
CLASS:PUBLIC
DESCRIPTION:The properties of ultrathin materials present exciting opportun
 ities to develop multifunctional surfaces. In addition\, the use of plasti
 c and thin glass as transparent substrates has the potential to extend the
  use of ultrathin materials beyond conventional substrates and provide vit
 al advancements to existing and emerging technologies across a wide range 
 of sectors. One of the main challenges facing next-generation transparent 
 substrates is the substantially reduced temperature processing window whic
 h is not compatible with materials requiring high fabrication temperatures
 . This thesis describes the development of\nfabrication techniques to obta
 in ultrathin materials on low thermal budget transparent substrates to cre
 ate surfaces with advanced optical and biological functionalities. More sp
 ecifically\, this thesis describes:\n\nA novel\, low temperature transfer 
 technique onto flexible substrates for ultrathin materials such as graphen
 e\, molybdenum disulfide and nanostructured metals that were previously gr
 own at a much higher temperature. The universality of the method extends t
 he use of these ultrathin materials to a wide range of technologically rel
 evant substrates such as cover glass for display modules and polymeric sub
 strates for next generation foldable and bendable electronics.\n\n\nA nove
 l approach to increase electrical conductivity of transparent surfaces bas
 ed on graphene\, without the need of post-treatment\, electrical gating or
  high temperatures. Notably\, the method achieves a conductivity of compar
 able magnitude or greater than what is reported in previous studies. Furth
 ermore\, the increase in electrical conductivity is realised simply by uti
 lizing an ion-exchanged substrate\, a technologically relevant transparent
  glass substrate that is widely used in touch screen displays (e.g. smart 
 phones).\nA low temperature metal dewetting technique to obtain transparen
 t antimicrobial nanostructured coatings on a cover glass substrate for dis
 play modules. The durability of the coatings was evaluated under condition
 s designed to simulate\n\nreal-world use cases such as capacitive touch di
 splays. The results show that the coatings were capable of substantially r
 etaining optical properties of the underlying substrate\, such as haze\, n
 eutral colour\, and visible light transmission\, as well as retaining anti
 microbial properties after repeated contact with external objects such as\
 , for example\, when wiping with a towel or cloth\, or touching with human
  fingers.\nThe results of this thesis demonstrate the implementation of ul
 trathin and nanostructured materials\, such as graphene and nanostructured
  metals onto a wide range of technologically relevant transparent substrat
 es\, by methods that are industrially scalable and compatible with low tem
 perature processing. At the same time\, surfaces are engineered with advan
 ced optical and biological functionalities that are relevant for applicati
 ons such as transparent electrodes and antimicrobial coatings .\nTuesday J
 anuary 23\, 15:00 h. ICFO Auditorium and Online (Teams)\nThesis Director: 
 Prof Dr. Valerio Pruneri
DTSTAMP:20260407T073644Z
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