Article
Polymer Science
Anna Lena Oechsle, Julian E. Heger, Nian Li, Shanshan Yin, Sigrid Bernstorff, Peter Muller-Buschbaum
Summary: The study compares the effects of different ionic liquids on the post-treatment of PEDOT:PSS thin films and shows that by adjusting the doping levels, the Seebeck coefficient and conductivity are enhanced, leading to an increased power factor of the film. Ionic liquid treatment helps optimize the distribution of PEDOT domains, improving film interconductivity and conductivity.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Physics, Applied
Yijie Xia, Ying Cui, Pengju Huang, Luchao Wu, Shuaishuai Du, Yinfei Zhu, Jian Lin, Xuyan Liu, Gaoyu Zhong
Summary: This study developed a mild treatment method using a cosolvent of formamide and methanol to significantly improve the film conductivity of PEDOT:PSS. The flexible piezoresistive sensor made with the treated film demonstrated good performance in detecting finger joint movement.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Div Chamria, Christopher Alpha, Ramesh Y. Adhikari
Summary: We have developed a method for assembling and characterizing highly conductive films of composites of phenylalanine and PEDOT:PSS. These films exhibit significantly improved conductivity compared to pure PEDOT:PSS films, and the conductivity can be tuned by adjusting the amount of phenylalanine. Our findings suggest that the improved conductivity is due to the phase separation of PSS chains from PEDOT:PSS globules, which creates efficient charge transport pathways. This technique has the potential for the development of low-cost, biocompatible, and biodegradable electronic materials.
Article
Polymer Science
Wesley Michaels, Yan Zhao, Jian Qin
Summary: The study developed all-atom force fields for undoped and highly doped PEDOT systems, which showed significant improvements in simulating molecular structures and properties compared to GAFF. Meaningful differences were identified between undoped and highly doped PEDOT, with the optimized force fields capturing the finite size of charge carriers in doped PEDOT models.
Article
Nanoscience & Nanotechnology
Jie Wang, Ruixiang Peng, Jing Gao, Dandan Li, Lin Xie, Wei Song, Xiaoli Zhang, Yaqin Fu, Ziyi Ge
Summary: The study fabricated Ti3C2Tx/PEDOT:PSS composite films by a simple solution process and utilized them as an anode interfacial layer in organic solar cells, achieving a high power conversion efficiency of 17.26%. The composite interface improved the conductivity and charge extraction efficiency of the devices, providing an effective method for high-performance organic solar cells.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Shanshan Yin, Wei Cao, Qing Ji, Yajun Cheng, Lin Song, Nian Li, Christian L. Weindl, Matthias Schwartzkopf, Stephan Roth, Peter Muller-Buschbaum
Summary: Mesoporous alpha-Fe2O3 thin films with large area homogeneity show great potential in various applications. In this work, morphology-controlled thin films were synthesized using PS-b-P4VP diblock copolymer assisted sol-gel chemistry. By adjusting the solvent type and polymer-to-FeCl3 ratio, the morphology of the thin films can be systematically tuned, leading to different nanocluster structures and porous formations. Adjusting the solvent selectivity in DMF/1,4-dioxane solvent mixtures also results in a transition from spherical to wormlike pore shapes.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Polymer Science
Chun-Yuan Lo, Yuhang Wu, Elorm Awuyah, Dilara Meli, Dan My Nguyen, Ruiheng Wu, Bohan Xu, Joseph Strzalka, Jonathan Rivnay, David C. Martin, Laure Kayser
Summary: The commercially available polyelectrolyte complex PEDOT:PSS has been widely used in organic and hybrid electronics as a benchmark material. However, previous studies mainly focused on its electronic conductivity in dry environments and paid less attention to its ion transport, coupled ionic-electronic transport, and charge storage properties in aqueous environments. This study investigates the effects of the molecular weight and size distribution of PSS on the electronic properties and morphology of PEDOT:PSS in both dry and aqueous environments, as well as its performance in organic electrochemical transistors (OECTs). The results show that higher molecular weight and broad dispersity of PSS lead to OECTs with the highest transconductance and μC* values in PEDOT:PSS, despite having a lower volumetric capacitance. The microstructure of the films was found to play a key role in these differences. These findings emphasize the importance of considering molecular weight and size distribution in organic mixed ionic-electronic conductors for high-performance organic electronics in biological interfaces.
Article
Materials Science, Multidisciplinary
Joe Troughton, Nathalie Peillon, Andras Borbely, Jhonatan Rodriguez-Pereira, David Pavlinak, Jan M. Macak, Thierry Djenizian, Marc Ramuz
Summary: This paper reports a laser micro-annealing process that enhances the conductivity of PEDOT:PSS without the need for additional chemical treatments, increasing it from 1 S cm(-1) to 360 S cm(-1). This process is applied in the fabrication of organic electrochemical transistors (OECTs), which show comparable performance to those made with common additives. The simplicity and efficiency of this method make it a promising technique for the production of flexible electronics.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Physical
Enas Moustafa, Maria Mendez, Jose G. Sanchez, Josep Pallares, Emilio Palomares, Lluis F. Marsal
Summary: Finding an effective approach to suppress trap formation is important for enhancing the performance of nonfullerene organic photovoltaic devices. In this study, a prethermal treatment approach is used to optimize the PEDOT:PSS/PM6:Y7 films and interface morphologies, resulting in a significant increase in short-circuit current density (J(SC)) and power conversion efficiency (PCE). The optimized devices exhibit better blend morphology, improved exciton dissociation probabilities, and balanced electron/hole mobility, leading to enhanced J(SC) and PCE.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Qun Gu, Jie Wang, Ruixiang Peng, Wei Song, Rong Zhou, Ziyi Ge
Summary: In this study, a composite layer of V2C/PEDOT:PSS is prepared, which has a lower work function and higher conductivity than pure PEDOT:PSS films. The improved Ohmic contact between the active layer and electrode leads to enhanced efficiency of organic solar cells.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Materials Science, Composites
Junwei Li, Zhenqiang Ye, Pingjing Mo, Yunsong Pang, Enze Gao, Chenxu Zhang, Guoping Du, Rong Sun, Xiaoliang Zeng
Summary: With the advancement of chip technology, heat dissipation has become a critical challenge for electronic devices. In this study, a high-performance carbon fiber/polydimethylsiloxane (CF/PDMS) thermal interface material (TIM) was developed, exhibiting excellent thermal conductivity, elastic compliance, and resilience performance. Moreover, the heat dissipation capability of CF/PDMS TIM was further improved by forming interconnected heat-conducting structures on its surface. The optimized CF/PDMS TIM showed superior heat dissipation capability and stability, outperforming commercial TIM in microprocessor cooling application.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
S. Q. Jia, L. Bolzoni, T. Li, F. Yang
Summary: Due to the distinction of (111) and (100) faces, metal additives preferentially form interface layers on diamond particles in copper/diamond composites. The interface layers formed can affect the thermal conductivity of the composites. Copper-55 vol%(Cr-coated) diamond composites were produced by hot forging under different temperatures, and the evolution of the carbide interface formation on diamond surfaces was studied. Different behavior was observed below and above 850 degrees C, and the thermal conductivity was highest for the sample hot forged at 1050 degrees C.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Composites
Jian Zheng, Ming Gong, Wenying Zhou, Weiwei Peng, Fanrong Kong, Hongju Wu, Guangheng Wang, Huiwu Cai, Mengxue Yuan
Summary: In this study, SiO2 shells with different morphologies were constructed on the superficies of ss-SiCw to enhance the TC and dielectric performances of ss-SiCw@SiO2/PVDF. The composites showed significantly restricted loss and improved TC due to the suppression of direct contact between ss-SiCw and the hindered long-distance charges migration by the SiO2 shell. The crystalline SiO2 interlayer with a high TC achieved a more evident enhancement effect in the epsilon and TC but low loss of the composites.
POLYMER COMPOSITES
(2023)
Article
Chemistry, Physical
Qi Wu, Wenjun Li, Chang Liu, Yawei Xu, Guoguang Li, Hongxing Zhang, Jinyin Huang, Jianyin Miao
Summary: This study presents a method to enhance the thermal conductivity of elastomeric thermal interface materials (TIMs) for spacecraft by incorporating mesophase pitch-based carbon fibers (CFs) and utilizing a strong magnetic field for fiber alignment. The resultant composite shows significantly improved through-plane thermal conductivity compared to traditional alumina/silicone rubber composites and meets the vacuum outgassing performance standard for spacecraft. Ground and on-orbit tests confirm its excellent heat transfer capability in both environments.
Article
Engineering, Environmental
Fenyang Tian, Shuo Geng, Lin He, Yarong Huang, Akhmat Fauzi, Weiwei Yang, Yequn Liu, Yongsheng Yu
Summary: Transition metal phosphides, specifically PSS-PPy/Ni-Co-P, have been shown to exhibit highly efficient hydrogen evolution reaction performance in neutral-pH electrolyte, with remarkable activity and stability achieved through conductivity, hydrophilicity, and electronic structure optimization. This research paves the way for the design of low-cost, high-efficiency, and stable electrocatalysts for HER in neutral-pH electrolyte.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Xuehe Jiang, J. Benedikt Mietner, Constantin Harder, Rajesh Komban, Shouzheng Chen, Christian Strelow, Uta Sazama, Michael Froeba, Christoph Gimmler, Peter Muller-Buschbaum, Stephan V. Roth, Julien R. G. Navarro
Summary: A cellulose nanofibril-based hybrid gel material was developed by grafting polymerized stearyl acrylate (PSA) and upconversion nanoparticles (UCNPs) onto cellulose nanofibrils (CNFs) via Cu-mediated radical polymerization (SET-LRP). The hybrid material (UCNP-PSA-CNF) showed efficient modification of the CNF with 1.8% UCNPs. The gel exhibited good viscoelasticity, shear-thinning behavior, and shape retention, making it suitable for 3D gel printing.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Physical
Nadesh Fiuza-Maneiro, Kun Sun, Iago Lopez-Fernandez, Sergio Gomez-Grana, Peter Muller-Buschbaum, Lakshminarayana Polavarapu
Summary: Lead halide perovskite nanocrystals (LHP NCs) are semiconductor materials with exceptional optical and optoelectronic properties. The surface chemistry, including ligands and surface termination, plays a crucial role in determining the optical and optoelectronic performance as well as the colloidal stability of LHP NCs. Functionalization of the surface with desired molecules can induce new functionalities, such as photocatalysis and chirality. This review provides an atomic view of the surface chemistry of colloidal LHP NCs, including crystal termination, vacancies, and different types of capping ligands, and discusses the ligand-induced functionalities.
ACS ENERGY LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Nianci Guan, Guo Wu, Jian Wang, Yaqi Bao, Wei Hui, Zhaoqi Deng, Lei Gu, Xingyu Gao, Jing Zhang, Peter Muller-Buschbaum, Lin Song
Summary: Polymerized ionic liquid additives improve the efficiency and stability of perovskite solar cells. By incorporating the polymeric ILs into perovskite films and solar cells, the problems of aggregation and evaporation can be overcome, and the crystallization behavior of perovskite films and charge-carrier transport can be improved, resulting in highly efficient and stable solar cells.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Hongmei Zhu, Qingqian Wang, Kun Sun, Wei Chen, Jun Tang, Junjie Hao, Zhaojin Wang, Jiayun Sun, Wallace C. H. Choy, Peter Muller-Buschbaum, Xiao Wei Sun, Dan Wu, Kai Wang
Summary: The chirality of 2D chiral perovskite films has been significantly enhanced by a solvent modulation strategy, leading to the formation of CPL-active materials. By creating chiral perovskite/quantum dot composites, an increase in the CPL intensity was observed, attributed to the generation and transportation of spin-polarized charge carriers as well as the enlarged lattice distortion of the chiral perovskite films achieved through solvent modulation. This approach provides an effective way to construct CPL-active materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Kun Wang, Jiangwei Huo, Li Cao, Peihui Yang, Peter Muller-Buschbaum, Yu Tong, Hongqiang Wang
Summary: Researchers have developed a strategy to fabricate high-quality alpha-FAPbI3 perovskite films and inverted PSCs under open air conditions with a relative humidity of 60+/-10%. They incorporated phenylethylammonium iodide (PEAI) to inhibit the decomposition and phase transition of FAPbI3 and improve its crystallinity, resulting in enhanced power conversion efficiency and long-term stability of the PSCs.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Cristiane Henschel, Dirk Schanzenbach, Andre Laschewsky, Chia-Hsin Ko, Christine M. Papadakis, Peter Mueller-Buschbaum
Summary: Sets of nonionic polymers pNVIBAm and pNIPMAm with molar mass from 20,000 to 150,000 kg mol-1 are synthesized by radical polymerization, and their thermoresponsive and solvent-responsive behaviors in aqueous solution are studied. Both polymers exhibit a rare type II lower critical solution temperature (LCST), similar to well-studied pNIPAm. Additionally, both polymers display co-nonsolvency behavior in mixtures of water with various co-solvents, but the co-nonsolvency becomes less pronounced in the order pNIPAm > pNVIBAm > pNIPMAm. Notably, pNIPMAm does not exhibit co-nonsolvency in mixtures of water and N,N-dimethylformamide.
COLLOID AND POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Hongye Dong, Guibin Shen, Yuqin Zou, Yiyi Li, Zhichao Lin, Qingbin Cai, Xiangning Xu, Qili Song, Hairui Duan, Peter Mueller-Buschbaum, Cheng Mu
Summary: In this study, engineered components of metformin halides were introduced into the bulk and surface of perovskite layers in perovskite solar cells (PSCs), leading to synergistic defect passivation. The bulk addition of metformin hydrochloride influenced the orientation distribution of perovskite crystals and contributed to better perovskite films, while the modification of metformin iodide treated residual defects on the surface of perovskite films. The synergistically passivated PSCs exhibited an improved power conversion efficiency (PCE) and excellent thermal and humidity stabilities.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Editorial Material
Multidisciplinary Sciences
Peter Mueller-Buschbaum
NATIONAL SCIENCE REVIEW
(2023)
Article
Chemistry, Multidisciplinary
Leon Katzenmeier, Manuel Goesswein, Leif Carstensen, Johannes Sterzinger, Michael Ederer, Peter Mueller-Buschbaum, Alessio Gagliardi, Aliaksandr S. Bandarenka
Summary: The interface between metallic lithium and solid-state electrolytes is investigated to understand the charge and mass transport mechanisms and the underlying mechanisms of charge accumulation. This is crucial for developing high-performance solid-state batteries.
COMMUNICATIONS CHEMISTRY
(2023)
Article
Polymer Science
Dominik M. Schwaiger, Wiebke Lohstroh, Marcell Wolf, Christopher J. Garvey, Peter Mueller-Buschbaum
Summary: Blending PTB7 and PCBM films with binary solvent additive DIO:DPE accelerates the degradation of the films, but the removal of the additives at higher annealing temperature can restore the stability to the level of the pristine blend films, which is promising for photovoltaic applications.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Zheng Fang, Huawei Xu, Qiang Xu, LiuBang Meng, Nan Lu, Renhong Li, Peter Mueller-Buschbaum, Qi Zhong
Summary: Inspired by the transpiration in tree stem, a multi-scale micro-nano channel structure was formed by directional freezing, redox polymerization, and nanoparticles-induced porosity in a hybrid P(AAm/DA)-Ag/MgO hydrogel coating cross-linked on microfiber-based polyurethane. This structure significantly increased the specific surface area and enabled efficient formaldehyde removal by the hydrogels and degradation by the Ag/MgO nanoparticles. The cross-linked hybrid hydrogel coating on polyurethane also demonstrated good anti-bacterial capability.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Shahidul Alam, Haya Aldosari, Christopher E. Petoukhoff, Tomas Vary, Wejdan Althobaiti, Maryam Alqurashi, Hua Tang, Jafar I. Khan, Vojtech Nadazdy, Peter Mueller-Buschbaum, Gregory C. Welch, Frederic Laquai
Summary: This study investigates the thermally-induced degradation of organic photovoltaic devices and its effect on their optical properties, photophysics, and morphology. The results show that the degradation limits the open-circuit voltage and fill factor of the devices, while the short-circuit current density is only slightly affected. Energy-resolved electrochemical impedance spectroscopy measurements reveal a higher energy barrier for charge transfer in the degraded samples. Furthermore, the study finds that field-dependent charge generation significantly limits device performance.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Manuel A. Reus, Ahmed Krifa, Quinten A. Akkerman, Alexander Biewald, Zehua Xu, David P. Kosbahn, Christian L. Weindl, Jochen Feldmann, Achim Hartschuh, Peter Mueller-Buschbaum
Summary: Printing the active layer of (Cs:FA)PbI3-based nanocrystal solar cells using slot-die coating technique improves the processability and charge transport, and shows a proof-of-concept feasibility for solar cell applications with a median power conversion efficiency of 6.39%.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Marie Betker, Constantin Harder, Elisabeth Erbes, Julian Eliah Heger, Alexandros Efraim Alexakis, Benedikt Sochor, Qing Chen, Matthias Schwartzkopf, Volker Koerstgens, Peter Mueller-Buschbaum, Konrad Schneider, Simone Agnes Techert, L. Daniel Soderberg, Stephan V. Roth
Summary: In this study, researchers evaluate the suitability of two types of inks containing silver nanowires for the fabrication of cellulose-based silver nanowire electrodes. The results show that the ink containing cellulose nanofibrils has lower sheet resistance, lower surface roughness, shorter fabrication time, and better mechanical and long-term stability compared to the other type of ink. The mixed ink of silver nanowires and cellulose nanofibrils is found to be suitable for the fast fabrication of highly conductive organic nanoelectronics on an industrial scale.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Neng Hu, Bin Hong, Xuefeng Yan, Hao Wu, Qi Zhong, Dongming Qi, Weijia Wang, Lin Lei, Huiqing Fan, Peter Mueller-Buschbaum
Summary: Inspired by Chinese wood oil coating on umbrella, the study developed a hybrid hydrogel-based UV radiation monitor by coating an ionic polymer layer onto the hydrogels. The monitor can trace the solar UV radiation dose in water environments by monitoring the discoloration extent of dyed hybrid hydrogels. The hybrid hydrogels are synthesized by introducing g-C3N4 nanosheets into the hydrogels. The coated hybrid hydrogels show excellent resistance against dye leakage and are suitable for wearable devices to monitor skin health in aqueous environments under sunshine.
ACS APPLIED POLYMER MATERIALS
(2023)
