Luminescent Mechanoresponsive Nanocomposite

**Luminescent mechanoresponsive nanocomposite**:

- Réf
- **ABG-118254**
- Sujet de Thèse- 21/11/2023- Contrat doctoral- Université de Rennes - Institut des Sciences Chimiques de Rennes- Lieu de travail- Rennes - Bretagne - France- Intitulé du sujet- Luminescent mechanoresponsive nanocomposite- Champs scientifiques- Chimie
- Matériaux
- Mots clés- polymer, luminescence, hybrid material, organic synthesis, mechanoresponsive**Description du sujet**:

- The direct translation of a mechanical force into an easily readable luminescence signal opens up new perspectives in the field of materials and mechanical stress detection. To date, these functional materials are mainly based on the integration of emissive organic mechanophores. However, these compounds are limited by their photobleaching problems, lack of sensitivity and synthesis costs. The aim of this internship is to explore a new detection concept by developing low cost, mechanoreactive hybrid luminescent copolymers incorporating two complementary emitters: 3-oxindole derivatives and octahedral molybdenum clusters (Mo6).- Mo6 are red phosphorescent with high quantum yields, have excellent photostability and are very sensitive to O2. Derivatives of 3-oxindoles are blue-green luminescent and can be easily functionalised to copolymerise and interact with Mo6. This project brings together 2 fundamental concepts in a single material: i) the quenching of phosphorescence by O2, which destroys the O2 molecules by producing singlet oxygen, ii) the variation of oxygen permeability under mechanical stress of semi-crystalline polymers. As described in Figure 1, such changes modify the emission colour of the nanocomposite containing the two emitters, thus allowing the direct visualisation of a mechanical stress under UV-2A irradiation.- This pluridisciplinary project is organised in several phases combining molecular and macromolecular synthesis, pure and in-operando photophysical studies (coupled with mechanical sensing). The person recruited will benefit from a threefold training in synthesis and characterisation of hybrid polymers in the OMC (M. Achard) and CSM (M. Amela-Cortes, Y. Molard) teams, in photophysical measurements (Caphter UAR ScanMAT platform) and in characterisation of mechanical behaviour with and without UV-2A irradiation (IPR, QI2M team).-
- Related publications:
- Khlifi, S.; Fournier Le Ray, N.; Paofai, S.; Amela-Cortes, M.; Akdas-Kilic, H.; Taupier, G.; Derien, S.; Cordier, S.; Achard, M.; Molard, Y., Self-erasable inkless imprinting using a dual emitting hybrid organic-inorganic material. Mater. Today 2020, 35, 34-41.- Robin, M.; Dumait, N.; Amela-Cortes, M.; Roiland, C.; Harnois, M.; Jacques, E.; Folliot, H.; Molard, Y., Direct Integration of Red-NIR Emissive Ceramic-like AnM6Xi8Xa6 Metal Cluster Salts in Organic Copolymers Using Supramolecular Interactions. Chem. Eur. J. 2018, 24 (19), 4825-4829.- Amela-Cortes, M.; Paofai, S.; Cordier, S.; Folliot, H.; Molard, Y., Tuned Red NIR phosphorescence of polyurethane hybrid composites embedding metallic nanoclusters for oxygen sensing. Chem. Commun.
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**2015**, 51, 8177-8180.**Nature du financement**:

- Contrat doctoral**Précisions sur le financement**:

- ANR**Présentation établissement et labo d'accueil**:

- Université de Rennes - Institut des Sciences Chimiques de RennesResearch in chemistry in Rennes is in line with the main orientations of the national research strategy, following five major axes associated with strong societal issues : (a) health & well-being, (b) sustainable chemistry and processes, (c) environment, energy, (d) optics and photonics, (e) electronics and molecular materials.

To carry out all of its work, ISCR benefits from a large number of chemical, physicochemical and physical skills and techniques, on its own platforms or on shared local platforms (Scanmat, Biosit,)

In addition to its multidisciplinary nature, ISCR has also developed important partnerships at the Rennes site (IPR, IETR, FOTON, IGDR, OSUR, etc.) in France and with many colleagues worlwide. These strong and productive collaborations, recognized and supported by several LIA / UMI / GDRIs (USA, India, China, United Kingdom, Chile, Germany, Russia, Australia and Japan) have led to numerous structuring projects (ANR, FP7, H2020) within the French and international scientific community.

Industrial partnerships are also strongly present. An important part concerns fundamental, long-term or medium-term research with major French or foreign industrial groups, but also with small and medium-sized companies, in order to remove technological locks and thereby contribute to the development of the socio-economic network. ISCR valorizes its research through more than 20 patents per year. Moreover, ISCR also benefits from the contributions of local authorities (Rennes Métropole, Brittany Region) which make a major contribution to the attractiveness of the Institute.

With 17 years of existence, ISCR has be