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PHD1
Title: Surface energy and phase stability in molecular nano-objects
Keywords: Molecular switches, nanomaterials, statistical physics, nanothermodynamics, atomic force microscopy, molecular dynamics.
Supervisors: Azzedine Bousseksou and William Nicolazzi
Contacts: azzedine.bousseksou@lcc-toulouse.fr, william.nicolazzi@lcc-toulouse.fr
Location: Laboratoire de Chimie de Coordination, CNRS & University of Toulouse, 205 route de Narbonne, 31077 Toulouse, France
Abstract: Nanoscale spin crossover materials capable of undergoing reversible switching between two electronic configurations with markedly different physical properties are excellent candidates for various technological applications [1]. The successful downsizing of these molecular materials in the past decade has created a tangible opportunity to seriously consider these technological prospects, but revealed also undesirable finite size effects [2]. We have pointed out that size reduction effects include mainly surface-related phenomena and the concept of spin-state dependent surface energy and surface stress has been introduced [3]. This PhD project will be devoted to the quantitative analysis of surface energies in the high spin and low spin forms of a thin molecular layer using a combined experimental/theoretical approach based on atomic force microscopy measurements [4] and molecular dynamics calculations [5]. We expect that this work will allow us to establish a more direct link between the microscopic theory of spin crossover and experiments and, ultimately, to achieve a more rational nanomaterial design.
References:
[1] Adv. Mater. 2018, 30, 1703862.
[2] J. Phys. Chem. Lett. 2019, 10, 1511.
[3] Phys. Rev. Lett. 2013, 110, 235701.
[4] Adv. Mater. 2014, 26, 2889.
[5] Phys. Rev. B 2017, 96, 035427.
PHD2
Title: Molecule-based phase change materials for all-optical switching
Keywords: Molecular switches, phase change materials, optical switches, photonic devices.
Supervisor: Gabor Molnar
Contacts: gabor.molnar@lcc-toulouse.fr
Location: Laboratoire de Chimie de Coordination, CNRS & University of Toulouse, 205 route de Narbonne, 31077 Toulouse, France
Abstract: Materials that undergo electronic and/or structural phase change associated with a reversible change of optical properties have received recently increasing attention for fundamental research in light-matter interactions as well as for the development of active photonic devices [1-2]. These phase change materials (PCMs) exhibit large changes of the refractive index in response to an external stimulus, which has been exploited for a variety of photonic applications such as smart windows, optical memories, spatial light modulators and photonic integrated circuits. Emerging molecular spin crossover nanomaterials may provide significant advantages over conventional PCMs (e.g. chalcogenides and liquid crystals) such as low losses in the visible-NIR range, low power operation and the possibility of fast all-optical modulation [3-4]. This PhD thesis aims at demonstrating these promises in operando conditions (e.g. in spin crossover based waveguides, gratings, optical cavities, etc.) in order to be able to compare the different figures of merit of spin crossover compounds with the current landscape of PCM materials.
References:
[1] Optical Materials Express 2018, 8, 332434.
[2] IEEE Photonics Journal 2015, 7, 0700305.
[3] Advanced Materials 2018, 30, 1703862.
[4] Advanced Materials 2019, 31, 1901361. |