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Thermal and Photon Driven Reactions of NO and H2O Adsorbed on Graphite

Kristina Wettergren (Institutionen för teknisk fysik, Kemisk fysik)
Göteborg : Chalmers University of Technology, 2010. - 64 s.
[Licentiatavhandling]

The topic of this thesis is the interaction of water (H2O) and nitric oxide (NO) with the graphite (C(0001)) surface. Specifically the effects of coadsorbing metals (Na, Ag) and subjecting the adsorption systems to thermal and photon activation were studied.

When coadsorbing sodium and water a critical coverage was found, θc, above which dissociative adsorption took place. For coverages below θc the adsorption was molecular and resulted in clustering of the molecules around the Na.

The reaction products from the NO/Na/graphite system were shown to depend on the ratio between adsorbed NO and Na, with three distinct coverage ratio regimes. When water was added to the system small amounts of ammonia were formed, in addition to the reaction products seen without water present in the system.

NO was found to photodesorb from graphite upon illumination with 355 nm light by a substrate-mediated mechanism. When silver clusters were added to the surface we found a clear dependence of the photoyield on the size and shape of the clusters.

Nyckelord: Nitric Oxide, Water, Sodium, Graphite, Particle Plasmons, Silver Clusters, Photodesorption



Denna post skapades 2010-11-17. Senast ändrad 2010-11-18.
CPL Pubid: 129196

 

Institutioner (Chalmers)

Institutionen för teknisk fysik, Kemisk fysik (1900-2015)

Ämnesområden

Kemisk fysik
Ytor och mellanytor

Chalmers infrastruktur

Relaterade publikationer

Inkluderade delarbeten:


Co-adsorption and reactions of Na and H<sub>2</sub>O on graphite


Photodesorption of NO from graphite ( 0 0 0 1 ) surface mediated by silver clusters


The interactions of Na, NO, and H<sub>2</sub>O on the graphite (0001) surface


Examination

Datum: 2010-12-15
Tid: 14:00
Lokal: Fasrummet, Fysikgränd 3, CHALMERS TEKNISKA HÖGSKOLA
Opponent: Professor Janusz Kanski, Fasta Tillståndets Fysik, Institutionen för Teknisk Fysik, CHALMERS TEKNISKA HÖGSKOLA