Publications

@article{Yin2020,
title = {Key Factor Study for Amphiphilic Block Copolymer-Templated Mesoporous SnO2 Thin Film Synthesis: Influence of Solvent and Catalyst},
author = {Shanshan Yin and Ting Tian and Kerstin S Wienhold and Christian L Weindl and Renjun Guo and Matthias Schwartzkopf and Stephan V Roth and Peter Müller-Buschbaum},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/admi.202001002},
doi = {https://doi.org/10.1002/admi.202001002},
year = {2020},
date = {2020-01-01},
journal = {Advanced Materials Interfaces},
volume = {7},
number = {18},
pages = {2001002},
abstract = {Abstract As a crucial material in the field of energy storage, SnO2 thin films are widely applied in daily life and have been in the focus of scientific research. Compared to the planar counterpart, mesoporous SnO2 thin films with high specific surface area possess more attractive physical and chemical properties. In the present work, a novel amphiphilic block copolymer-assisted sol–gel chemistry is utilized for the synthesis of porous tin oxide (SnO2). Two key factors for the sol–gel stock solution preparation, the solvent category and the catalyst content, are systematically varied to tune the thin film morphologies. A calcination process is performed to remove the polymer template at 500 °C in ambient conditions. The surface morphology and the buried inner structure are probed with scanning electron microscope and grazing-incidence small-angle X-ray scattering. Crystallinity is characterized by X-ray diffraction. The multi-dimensional characterization results suggest that cassiterite SnO2 with spherical, cylindrical, and vesicular pore structures are obtained. The variation of the film morphology is governed by the preferential affinity of the utilized solvent mixture and the hydrogen bond interaction between the employed cycloether and H2O molecules in the solution.},
keywords = {mesoporous structures, morphology, PS-b-PEO, SnO2, thin films},
pubstate = {published},
tppubtype = {article}
}

@article{Yang2020,
title = {In Situ Studies of Solvent Additive Effects on the Morphology Development during Printing of Bulk Heterojunction Films for Organic Solar Cells},
author = {Dan Yang and Sebastian Grott and Xinyu Jiang and Kerstin S Wienhold and Matthias Schwartzkopf and Stephan V Roth and Peter Müller-Buschbaum},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/smtd.202000418},
doi = {https://doi.org/10.1002/smtd.202000418},
year = {2020},
date = {2020-01-01},
journal = {Small Methods},
volume = {4},
number = {9},
pages = {2000418},
abstract = {Abstract The development of polymer morphology and crystallinity of printed bulk heterojunction (BHJ) films doped with the different solvent additives 1,8-diiodooctane (DIO) or diphenyl ether (DPE) is investigated with in situ grazing-incidence small/wide-angle X-ray scattering. The solvent additives, having different boiling points, lead to a different film drying behavior and morphology growth states in the BHJ films of the benzothiadiazole-based polymer (PPDT2FBT) and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM). The phase demixing in the printed films is changing over time along with solvent evaporation. Polymer domains start aggregating to form larger domains in the liquid–liquid phase, while phase separation mainly occurs in the liquid–solid phase. The present work provides a profound insight into the morphology development of printed BHJ films doped with different solvent additives, which is particularly important for the large-scale fabrication of organic photovoltaics.},
keywords = {crystallinity, morphology, PPDT2FBT:PC71BM films, printing, solvent additive},
pubstate = {published},
tppubtype = {article}
}

@article{Yin2020a,
title = {Key Factors for Template-Oriented Porous Titania Synthesis: Solvents and Catalysts},
author = {Shanshan Yin and Lin Song and Senlin Xia and Yajun Cheng and Nuri Hohn and Wei Chen and Kun Wang and Wei Cao and Shujin Hou and Peter Müller-Buschbaum},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/smtd.201900689},
doi = {https://doi.org/10.1002/smtd.201900689},
year = {2020},
date = {2020-01-01},
journal = {Small Methods},
volume = {4},
number = {3},
pages = {1900689},
abstract = {Abstract Various types of titania nanostructures are synthesized with a polymer-templated sol–gel method based on the amphiphilic diblock copolymer polystyrene-b-polyethylene oxide (PS-b-PEO) in combination with selective incorporation of the titania precursor titanium tetraisopropoxide. Custom tailoring of different types of titania morphologies is realized by changing the phase separation behavior of the PS-b-PEO template. Particularly, application of solvents from different categories is found to have a major impact upon the phase separation behavior of PS-b-PEO and the final titania film morphology. The amount of available hydrochloric acid catalyst during the gelation process is seen as an additional key factor to induce controllable morphological changes. Scanning electron microscopy and grazing incidence small angle X-ray scattering measurements are carried out to study the surface and inner structure of porous titania films. Systematic analysis and comparison of different characterization results allow attributing the following three factors to the respectively formed titania nanostructure: the surface energy between PS blocks and surrounding solvent, the aggregation behavior of the titania nanoparticles, and the block-specific selectivity of the used solvent. For all synthesized titania thin films, an anatase-type crystallization is confirmed through X-ray powder diffraction.},
keywords = {GISAXS, morphology, nanostructures, sol–gel synthesis, titania},
pubstate = {published},
tppubtype = {article}
}