Position 1: Development of High Performance Microelectrochemical Actuators based on 2D MXenes
Electrochemical actuators based on 2D nanomaterials especially MXenes are emerging in recent years. They convert electrical energy to mechanical energy via electrochemical processes, which can be driven at much lower voltage as compared with dielectric elastomeric actuators. For the development of materials towards better performance targeting at human-machine interface applications, it is important to understand the relationship between electrochemical behavior and strain response at micro- or nano-scale. In this Ph.D. project, we aim at establishing an analytical method for measuring the local electrochemical and strain performance of MXene-based electrodes. This will be realized by scanning electrochemical microscopy (SECM) or scanning gel electrochemical microscopy (SGECM) coupled with localized force measurements.
The work is supported by an ANR-NRF international collaboration project between France and Singapore: High Performance Microelectrochemical Actuators based on 2D MXenes. The Ph.D. student will be co-supervised by CNRS researchers Dr. Mathieu Etienne and Dr. Liang Liu. Dr. Mathieu Etienne is expert in shear force SECM, and active in the fields of bio-electrochemistry, redox flow batteries and bio-electrochemical remediation of natural water. Dr. Liang Liu has developed the gel probes and instrumentation for local electrochemical measurements in the recent years. The work will be carried out in Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l’Environnement (LCPME), with expected collaboration with Singaporean research team led by Prof. Pooi See Lee from Nanyang Technological University. The Ph.D. student will have a work contract with CNRS and register in Université de Lorraine, France. The duration of Ph.D. is 3 years and the starting date is Sep. 1, 2021.
Position 2: Polyoxometalate-functionalized vertically-aligned mesoporous silica films.
Polyoxometalates (POMs) are ideal molecular building blocks for constructing ROBUST 1-D metal oxides that are based on transition metal-oxygen octahedral subunits. POMs are electroactive species that can be switched from one oxidation state to another and thus store charges, they exhibit chemical stability and have a rich electrochemistry being able to accept and donate multiple electrons without structural changes. Their properties make them potential candidates for applications in molecular electronics and more specifically as active component of molecular memory devices.
We are especially interested here in the confinement of organic-inorganic hybrid POMs as aligned nanowires into mesostructured and vertically oriented silica-based films. The particular configuration of oriented mesoporous silica films appears to be especially convenient for ensuring 1D charge transport based on a very high density of independent molecular wires, thus avoiding the problems of interaction between closely-packed molecular wires and crosstalk problems reported for similar devices, and so to improve their conductance, stability and integration with respect to applications in molecular electronics. Determination of the optimal conditions promoting charge transfer and mass transport of POMs through silica nanochannels is mandatory to succeed in their confinement. Several strategies will be employed to assemble POMs, inside the nanochannels of perpendicularly oriented mesoporous vertically-oriented silica thin films to generate POM@SIL, hybrid materials. The development of the present project will allow us to study the charge transfer processes through these types of devices.
This work is funded by ANR POMSIL project as a collaboration between three partners (LCPME, ITODYS, ICP). The work will be performed at the Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l’Environnement closely interacting with the other research groups in Paris. The PhD student will be supervised by Dr. Neus Vilà and Dr. Alain Walcarius. The duration of Ph.D. is 3 years and the starting date is October 1, 2021.
Position 3: Chiral molecules occupy a major place in biochemical phenomena and are therefore involved in various fields of application ranging from pharmacochemistry (drugs) to agrochemistry (chiral pesticides for example). The use of these molecules with strong biochemical activity raises questions about their fate in the environment, the risks of pollution generated and their consequences. The detection of the enantiomers of a chiral molecule is a complex analytical problem; there is therefore an important field of investigation to develop new methods in lieu of more traditional techniques like chromatography using chiral columns. We propose in this thesis subject to exploit Raman scattering spectroscopy, a vibrational technique that can work with aqueous samples, to detect the enantiomers of chiral molecules. To achieve the low target concentrations, we will use gold nanoparticles to enhance the Raman signal (SERS effect). In order to obtain a reproducible and controlled film of nanoparticles, we will exploit the interface between two immiscible liquids to organize the deposition of nanoparticles through electrochemical control. Finally, the nanoparticles used can be made chiral and thus allow a qualitative and quantitative detection of each of the enantiomers of our target molecules (drugs or chiral pesticides). The thesis subject therefore includes a strong experimental development in order to perfect the current set-up coupling Raman spectroscopy and electrochemical techniques and presents a very innovative character compared to more traditional techniques.
This work, funded by the Université de Lorraine, will be carried out at the Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l’Environnement. The duration of Ph.D. is 3 years and the starting date is October 1, 2021.
Requirements of the candidate:
(1) Valid Master degree by the starting date of the position.
(2) Fluent in English communication. French language is not mandatory.
Education background in Physics, Chemistry or Engineering, with knowledge in electrochemistry and materials. Experience and interest in programming for instrumentation and/or data analysis is a bonus.
Education background in Chemistry and Physics with knowledge in electrochemistry, synthetic skills and materials.
Education background in Chemistry and Physics with knowledge in electrochemistry and spectroscopy. Interest in instrumentation development and programming is a bonus.
Please send a complete CV, a motivation letter and a complete transcript during Master (translated in French or English) to:
Dr. Mathieu Etienne firstname.lastname@example.org
Dr. Liang Liu email@example.com
For this position please apply through CNRS recruitment portal: Portail Emploi CNRS - Job offer - Development of High Performance Microelectrochemical Actuators based on 2D MXenes
Dr. Neus Vilà firstname.lastname@example.org
Dr. Alain Walcarius email@example.com
Dr Manuel Dossot : firstname.lastname@example.org
Dr Grégoire Herzog : email@example.comApprenez-en davantage
|Intitulé||PhD Positions in Electrochemistry|
|Employeur||Université de Lorraine|
|Job location||34 Cours Léopold, 54000 Nancy|
|Publié||avril 1, 2021|
|Date limite d'inscription||Non Spécifiée|
|Types d'emploi||PhD  |
|Domaines de recherche :||Génie chimique,   Nanotechnologie,   Chimie des matériaux,   Chimie analytique,   Électrochimie,   Chimie inorganique,   Chimie moléculaire,   Chimie physique,   Chimie des polymères,    and 13 more. Spectroscopie,   Chimie de surface,   Informatique dans les mathématiques, les sciences naturelles, l'ingénierie et la médecine,   Ingénierie des systèmes de commande,   Ingénierie d'instrumentation,   Dynamique des fluides,   Physique des matériaux,   Mécanique,   Chimie de synthèse,   Nanochimie,   Traitement du signal,   Mécanique des fluides,   Physico-chimie  |