Stephen Schrettl
Research Group Leader

Adolphe Merkle Institute
University of Fribourg
Chemin des Verdiers 4 | Fribourg, CH–1700
stephen (dot) schrettl (at) unifr (dot) ch

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I am currently a research group leader in the Polymer Chemistry and Materials group of Prof. Chris Weder at the Adolphe Merkle Institute in Switzerland. The research I am currently working on together with my colleagues focuses on the development of novel materials with interesting and useful properties. Our efforts focus especially on the preparation of materials that respond in useful ways to external stimuli such as mechanical stress. To achieve this, we combine chemical synthesis, polymer chemistry, and self-assembly methods to control the structure and function of materials.

Before taking up my current position, I studied Chemistry at Freie Universität Berlin with research towards the MSc. thesis carried out at ETH Zurich. I received my PhD in Materials Science from Ecole Polytechnique Fédérale de Lausanne in 2014, working with Prof. Holger Frauenrath on the synthesis of reactive oligoyne molecules, the investigation of organic reactions in single crystals, and the development of a wet-chemical approach for the preparation of carbon nanosheets from oligoyne carboxylates. This was followed by postdoctoral research first at EPFL, and then at the Adolphe Merkle Institute in Fribourg.

Below you can find a list of publications I have co-authored. Please check back soon for more information on the different activities and a more detailed overview of my research interests. Please get in touch if you have any questions or feedback.

In 2019, I co-organized the conference Bioinspired Materials: From understanding, through processing, to replication. Based on the positive feedback we received on this first edition of the conference, Prof. Esther Amstad and myself started organizing a second edition of that is scheduled to take place from August 8–13 2021 in Andermatt. The conference title is Natural materials and their bio-inspired counterparts. The international conference will focus on the characterization of natural materials and the fabrication of bio-inspired manmade counterparts. It aims at fertilizing interdisciplinary discussions between researchers that characterize natural materials and scientists and engineers that work on the fabrication of biomimetic materials. Please join us if you are interested!

Journal Articles

Mechanoresponsive Elastomers Made with Excimer-Forming Telechelics

D. J. Kiebala, Z. Fan, C. Calvino, L. Fehlmann, S. Schrettl,* C. Weder*
Organic Materials 2020, accepted.

Optical Gap and Fundamental Gap of Oligoynes and Carbyne

J. Zirzlmeier, S. Schrettl, J. C. Brauer, E. Contal, L. Vannay, É. Brémond, E. Jahnke, D. M. Guldi,* C. Corminboeuf,* R. R. Tykwinski,* H. Frauenrath*
Nat. Commun. 2020, 11, 4797–10. doi: 10.1038/s41467-020-18496-4

Mechanochromism in Structurally Colored Polymeric Materials

J. M. Clough,* C. Weder, S. Schrettl
Macromol. Rapid Commun. 2020, 17, 2000528. doi: 10.1002/marc.202000528

From Molecules to Polymers – Harnessing Inter- and Intramolecular Interactions for Mechanochromic Materials

H. Traeger, D. J. Kiebala,* C. Weder, S. Schrettl
Macromol. Rapid Commun. 2020, 17, 2000573. doi: 10.1002/marc.202000573

Structure−Property Relationships of Microphase-Separated Metallosupramolecular Polymers

L. N. Neumann, I. Gunkel, A. Barron, E. Oveisi, A. Petzold, T. Thurn-Albrecht,* S. Schrettl,* C. Weder*
Macromolecules 2020, 13, 5068-5084. doi: 10.1021/acs.macromol.0c00876

Mechanochromic Polymers Based on Microencapsulated Solvatochromic Dyes

C. Calvino, E. Henriet, L. F. Muff, S. Schrettl, C. Weder*
Macromol. Rapid Commun. 2020, 8, 1900654–10. doi: 10.1002/marc.201900654

Spatially Resolved Production of Platinum Nanoparticles in Metallosupramolecular Polymers

L. M. Olaechea, L. Montero de Espinosa, E. Oveisi, S. Balog, P. Sutton, S. Schrettl,* C. Weder*
J. Am. Chem. Soc. 2020, 142, 342–348. doi: 10.1021/jacs.9b10685

Preparation of Metallosupramolecular Single-Chain Polymeric Nanoparticles and their Characterization by Taylor Dispersion

L. N. Neumann, D. A. Urban, P. Lemal, S. Ramani, A. Petri-Fink, S. Balog, C. Weder, S. Schrettl*
Polym. Chem. 2020, 11, 586–592. doi: 10.1039/C9PY01264H

Healing of Polymeric Solids by Supramolecular Means

L. N. Neumann,* C. Weder S. Schrettl*
Chimia 2019, 73, 277–282. doi: 10.2533/chimia.2019.277

Synthesis and Properties of Poly(norbornene)s with Lateral Aramid Groups

P. Kong, S. Drechsler, S. Balog, S. Schrettl, C. Weder, A. F. M. Kilbinger*
Polym. Chem. 2019, 10, 2057–2063. doi: 10.1039/C9PY00187E

Functional Polymers Through Mechanochemistry

S. Schrettl,* D. W. R. Balkenende, C. Calvino, M. Karman, A. Lavrenova, L. N. Neumann, Y. Sagara, E. Verde-Sesto, M. di Giannantonio, Y. C. Simon, K. M. Fromm, M. Lattuada, C. Weder*
Chimia 2019, 73, 7-11. doi: 10.2533/chimia.2019.7

Mechanoresponsive, Luminescent Polymer Blends Based on an Excimer-Forming Telechelic Macromolecule

C. Calvino, Y. Sagara, V. Buclin, A. P. Haehnel, A. del Prado, C. Aeby, Y. C. Simon, S. Schrettl, C. Weder*
Macromol. Rapid Commun. 2019, 40, 1800705. doi: 10.1002/marc.201800705

Self-Calibrating Mechanochromic Fluorescent Polymers Based on Encapsulated Excimer-Forming Dyes

C. Calvino, A. Guha, C. Weder,* S. Schrettl*
Adv. Mater. 2018, 4, 1704603. doi: 10.1002/adma.201704603

Solid-State Sensors Based on Eu3+-Containing Supramolecular Polymers with Luminescence Colour Switching Capability

L. N. Neumann, C. Calvino, Y. C. Simon, S. Schrettl, C. Weder*
Dalton Trans. 2018, 46, 7105. doi: 10.1039/c8dt01580e

A Versatile Colorimetric Probe based on Thiosemicarbazide-Amine Proton Transfer

C. Calvino, M. Piechowicz, S. Rowan, S. Schrettl, C. Weder*
Chem. Eur. J. 2018, 115, 7944. doi: 10.1002/chem.201801551

Approaches to Polymeric Mechanochromic Materials

C. Calvino, L. Neumann, C. Weder,* S. Schrettl*
J. Polym. Sci. Part A: Polym. Chem. 2017, 55, 640–652. doi: 10.1002/pola.28445

Reversible microscale assembly of nanoparticles driven by the phase transition of a thermotropic liquid crystal

N. Mac Fhionnlaoich, S. Schrettl, N. B. Tito, Y. Yang, M. Nair, L. A. Serrano, K. Harkness, P. J. Silva, H. Frauenrath, F. Stellacci, S. Guldin*
ChemRxiv 2017 preprint. doi: 10.26434/chemrxiv.5691169.v1

50th Anniversary Perspective: Solid-State Multistimuli, Multiresponsive Polymeric Materials

K. M. Herbert, S. Schrettl, S. J. Rowan,* C. Weder*
Macromolecules 2017, 50, 8845-8870. doi: 10.1021/acs.macromol.7b01607
these authors contributed equally

Light-Responsive Azo-Containing Organogels

M. A. Ayer, S. Schrettl, S. Balog, Y. C. Simon,* C. Weder*
Soft Matter 2017, 13, 4017–4023. doi: 10.1039/c7sm00601b

Mechano- and Thermoresponsive Photoluminescent Supramolecular Polymer

A. Lavrenova, D. W. R. Balkenende, Y. Sagara, S. Schrettl, Y. C. Simon, C. Weder*
J. Am. Chem. Soc. 2017, 139, 4302–4305. doi: 10.1021/jacs.7b00342

highlighted in: Chimia, 2017, 71 (6), 384.

Synthesis and Use of Reactive Molecular Precursors for the Preparation of Carbon Nanomaterials

B. Schulte, S. Schrettl, H. Frauenrath*
Phys. Sci. Rev. 2017, 2, 20160100. doi: 10.1515/psr-2016-0100

Templating for Hierarchical Structure Control in Carbon Materials

S. Schrettl, B. Schulte, H. Frauenrath*
Nanoscale 2016, 8, 18828–18848. doi: 10.1039/C6NR06695J
these authors contributed equally

Preparation of Carbon Nanosheets at Room Temperature

S. Schrettl, B. Schulte, C. Stefaniu, J. Oliveira, G. Brezesinski, H. Frauenrath*
J. Vis. Exp. 2016, 109, e53505. doi: 10.3791/53505

Facile Synthesis of Oligoyne Amphiphiles and their Rotaxanes

S. Schrettl, E. Contal, T. N. Hoheisel, M. Fritzsche, S. Balog, R. Szilluweit, H. Frauenrath*
Chem. Sci. 2015, 6, 564–574. doi: 10.1039/C4SC03154G
these authors contributed equally

Soft-Landing Electrospray Ion Beam Deposition of Sensitive Oligoynes on Surfaces in Vacuum

G. Rinke,* S. Rauschenbach,* S. Schrettl, T. N. Hoheisel, J. Blohm, R. Gutzler, F. Rosei, H. Frauenrath, K. Kern
Int. J. Mass Spectrom. 2015, 377, 228–234. doi: 10.1016/j.ijms.2014.06.026

Functional Carbon Nanosheets Prepared from Hexayne Amphiphile Monolayers at Room Temperature

S. Schrettl, C. Stefaniu, C. Schwieger, G. Pasche, E. Oveisi, Y. Fontana, A. Fontcuberta i Morral, J.Reguera, R. Petraglia,
C. Corminboeuf, G. Brezesinski, H. Frauenrath*
Nature Chem. 2014, 6, 468–476. doi: 10.1038/nchem.1939

highlighted in: Nature Mater., 2014, 6, 538; Nature Chem., 2014, 6, 463–464; Angew. Chem, Int. Ed., 2014, 53, 12300–12302; Chimia, 2014, 68 (7), 566; Naturw. Rdsch., 2014, 67, 467.

A Multi-Step Single-Crystal-to-Single-Crystal Bromodiacetylene Dimerization

T. N. Hoheisel, S. Schrettl, R. Marty, T. K. Todorova, C. Corminboeuf, A. Sienkiewicz, R. Scopelliti, W. B. Schweizer, H. Frauenrath*
Nature Chem. 2013, 5, 327–334. doi: 10.1038/nchem.1575
these authors contributed equally

highlighted in: Chimia, 2013, 67 (5), 349.

Elements for a Rational Polymer Approach towards Carbon Nanostructures

S. Schrettl, H. Frauenrath*
Angew. Chem. Int. Ed. 2012, 51, 6569–6571. doi: 10.1002/anie.201201423

Nanostructured Carbonaceous Materials from Molecular Precursors

T. N. Hoheisel, S. Schrettl, R. Szilluweit, H. Frauenrath
Angew. Chem. Int. Ed. 2010, 49, 6496–6515. doi: 10.1002/anie.200907180

Monographs, Books, and Book Chapters

Synthesis and Use of Reactive Molecular Precursors for the Preparation of Carbon Nanomaterials

B. Schulte, S. Schrettl, H. Frauenrath
in Chemistry of Carbon Nanostructures, Eds.: K. Muellen, X. Feng
De Gruyter, Berlin/Boston, 2017, pp. 289–314. url

Functionalized Carbon Nanostructures from Oligoyne Carboxylates

S. Schrettl
Doctoral Thesis, École Polytechnique Fédérale de Lausanne (EPFL), 2014, No. 6326. url

Patents and Patent Applications

Methods for the Preparation of a Coating

H. Frauenrath, S. Schrettl, B. Schulte, Y. Leterrier,
EPFL (assignee), PCT/EP2015/061763, 2015.

Functional Carbon Nanosheets Prepared from Hexayne Amphiphile Monolayers at Room Temperature

S. Schrettl, H. Frauenrath,
EPFL (assignee), USPTO 62/154,807, 2015.

Other Publications

Low-Temperature Preparation of Functional Carbon Nanocapsules via Self-Assembly and Carbonization of Hexayne Amphiphiles

S. Schrettl, H. Frauenrath,
Chimia 2013, 67, 429. doi: 10.2533/chimia.2013.429

Carbon-Rich Nanostructures from Molecular Precursors

T. N. Hoheisel, R. Szilluweit, S. Schrettl, H. Frauenrath
MRS Proc. 2011, 1304, mrsf10-1304-z12-04. doi: 10.1557/opl.2011.611

Carbon-Rich Nanostructures from Molecular Precursors

H. Frauenrath, T. N. Hoheisel, S. Schrettl, R. Marty
Abstract of Papers, 238th ACS National Meeting 2009, 238, ORGN-430.