Atomic-resolution quantification of chemical interactions using three-dimensional atomic force microscopy
Başlık çevirisi mevcut değil.
- Tez No: 400146
- Danışmanlar: PROF. UDO D. SCHWARZ
- Tez Türü: Doktora
- Konular: Kimya, Chemistry
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2012
- Dil: İngilizce
- Üniversite: Yale University
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 179
Özet
Özet yok.
Özet (Çeviri)
Entire scientific disciplines such as mechanics and chemistry are governed by theinteractions between atoms and molecules. On surfaces, atomic-scale force and energyfields direct the behavior of many scientifically and technologically importantphenomena such as corrosion, adhesion, friction, and surface catalysis. To advance ourknowledge of the fundamentals governing these subjects, it would be useful to quantifyforce and energy interactions between the surface of interest and a probe with atomicresolution. For example, in the case of a catalytically active surface, this would allow astudy of the role and effectiveness of atomic-scale surface defects as active sites,potentially making important contributions to this key field for energy research.Moreover, a study of lateral forces on the atomic scale would provide new insightsregarding the atomic origins of friction, another field of intense research andtechnological importance.In this thesis, we will show that the recently developed method ofthree-dimensional atomic force microscopy (3D-AFM), based on noncontact atomic forcemicroscopy (NC-AFM), can be used towards achieving the goals described above.3D-AFM measurements on the surface of graphite provide important atomic-scale cluesregarding the excellent frictional properties of this solid lubricant, such as a remarkablelocalization of lateral forces around the hollow sites of the surface lattice, and a lineardependence of static friction values on normal forces in the attractive interaction regime.Furthermore, simultaneous NC-AFM and scanning tunneling microscopy (STM)measurements on the surface oxide layer on Cu(100) provide vastly different contrastmodes that help explain some aspects of atomic-scale contrast formation mechanisms inthese imaging methods, with help from ab initio density functional theory (DFT)simulations. More importantly, the combination of 3D-AFM with simultaneous STM andDFT calculations allows the quantification of the effect of surface defects on thechemical interaction forces associated with individual oxygen atoms on this samplesurface, providing direct, real space proof that surface defects influence chemicalreactivity on the atomic scale. Lastly, combined 3D-AFM/STM measurements performedon the prototypical metal oxide surface of TiO2(110) deliver the first atomic-scale mapsof chemical interaction forces on a sample surface of catalytic importance.
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