Nanocrystals modeling by advanced QHRTEM techniques

Author(s)

Daniel Grando Stroppa

• Document type: Doctoral Thesis
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Mecânica
• Defense date: 2011-07-11

Examining board members

Antonio Jose Ramirez Londono; Carlos Kenichi Suzuki; Daniela Zanchet; Caue Ribeiro de Oliveira; Paulo Fernando Papaleo Fichtner

• Advisor: Antonio Jose Ramirez Londono

Abstract

Technologies based on nanostructured materials depend on the development of reliable models which can support the fabrication of nanocrystals with highly controlled features. In this scenario, advances on high resolution quantitative techniques are required in order to improve the description of the nanostructured systems, especially the correlations among the nanocrystals synthesis parameters, the resultant morphology and the system properties. This PhD thesis presents the evaluation and use of different Quantitative High Resolution Transmission Electron Microscopy (QHRTEM) techniques aiming the three-dimensional morphology and the dopant species segregation characterization of individual oxide nanocristals (Sb:SnO2 e Gd:CeO2). In addition, the combined use of such techniques and theoretical calculations provided valuable insights on the surface energy distribution and growth mechanisms present on the analyzed nanocrystalline systems. The obtained high resolution quantitative characterization results indicate that QHRTEM techniques are priceless tools for both the nanocrystal modeling procedures development and application, and for the improvement of fundamental theories that describe the materials features at nanoscale. In this scenario, this thesis presents significant advances on the nanomaterials characteristics description and, consequently, on their further manipulation aiming novel technologies development according to the materials engineering approach (AU)

• FAPESP's process: 07/07837-2 - Nanocrystals modeling by QHRTEM advanced techniques
• Grantee: Daniel Grando Stroppa
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)