PhD Theses

PhD Thesis Defense by Qianzhe Zhang on 4 Oct 2019 at 10:30 am

The PhD Researcher Qianzhe Zhang from the Nanoparticles and Nanocomposites Group (NN) at ICMAB will defend his PhD thesis on Friday, 4 October 2019, at 10:30 am at the ICMAB

icmab
Sep 20, 2019

Microstructural Control of Epitaxial α-Quartz Films

by Qianzhe Zhang, Nanoparticles and Nanocomposites Group (NN), ICMAB-CSIC

Date: Friday, 4 October 2019
Time: 10:30 am
Venue: ICMAB - Sala d'Actes Carles Miravitlles

Abstract: 

Epitaxial α-quartz films could enable the fabrication of sensors for prospective applications. However, a prerequisite is to tailor α-quartz microstructures at the nanoscale. My PhD works bring new insights into the devitrification of silica into epitaxial α-quartz films on Silicon(100) and reveal how to control the film microstructure: It shows that by increasing the quantity of devitrifying agent (Sr), one can switch from an α-quartz microstructure consisting of porous flat film to a microstructure dominated by dense α-quartz crystals. Besides, other parameters such as film thickness, relative humidity and surfactant also can play important roles in microstructural control of films. Moreover, via a multilayer deposition method, film thickness can be extended to the micron range, which enable nanosructuring by lithography.

Supervisors:

  • Martí Gich Garcia, ICMAB-CSIC
  • Adrián Carretero-Genevrier, Group of NanoChemiLab, Institut d´electronique et des Systèmes (IES), France

PhD Committee:

  • President: Francisco Rivadulla Fernández, Departament Química física, Universitat de Santiago de Compostela, Spain
  • Secretary: Mariona Coll Bau, ICMAB-CSIC
  • Vocal:  Romain Bachelet, Institut de Nanotecnologia de Lyon, France
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