Article
Materials Science, Ceramics
Ruohong Sui, John H. Jacobs, Nancy Chou, Connor E. Deering, Christopher B. Lavery, Robert A. Marriott
Summary: Both affordability and stability are crucial for commercial-scale production and industrial applications of TiO2. This study investigated a facile sol-gel process using titanyl sulfate as a feedstock, which resulted in the stable formation of anatase phase with bimodal mesopores and macropores. These unique nanostructures make it suitable for catalysis and filtration applications.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Huiting Sui, Huajun Sun, Chao Yan, Shibing Xiao, Ye Wang, Xiaofang Liu, Duanping Huang
Summary: Lead-free thin films with excellent high recoverable energy density and efficiency were fabricated via the sol-gel process, exploring the effects of key parameters on their performance. The highest W-rec and eta were achieved for specific multilayer structures, showing considerable potential for lead-free energy storage applications.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Ceramics
Ryosuke Hamano, Hiromitsu Kozuka
Summary: We fabricated polycrystalline titania thin films on polycarbonate substrates using a sol-gel transfer technique. The films were converted from titania gel films deposited on a Si(100) substrate to polycrystalline titania thin films through firing at various temperatures. The films showed different crystalline phases and improved mechanical flexibility with increasing porosity.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Ksh Priyalakshmi Devi, Pranab Goswami, Harsh Chaturvedi
Summary: Although TiO2 is a popular semiconductor photocatalyst, its efficiency for solar energy conversion is limited due to its large bandgap. This paper introduces a cost-effective Sol-Gel technique using spin coating technology to fabricate nanocrystalline TiO2 thin films. The authors managed to achieve a dopant-free pure anatase nanocrystalline TiO2 thin film with a low band gap. Thorough investigations on the film's structure, optical characteristics, and surface morphology were conducted and presented.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Coatings & Films
Jonathan M. Schuster, Maria L. Vera, Carlos E. Schvezov, Mario R. Rosenberger
Summary: In this study, a nanoporous/compact titanium oxide coating was synthesized on the Ti-6Al-4V alloy using the anodic oxidation and sol-gel dip-coating techniques. The coating exhibited a thickness of 600 nm, low surface roughness, and a crack-free structure, with a crystalline structure of anatase and rutile.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Yu-Xuan Li, Ping Li, Yu-Zhe Wu, Zhen-Liang Xu, Ming-Ling Huang
Summary: A novel TiO2 thin film was prepared on ceramic hollow fibers using sol-gel method with PVP and PVA as additives. The effects of different PVP and PVA contents on the properties of TiO2 sol and the performance of ultrafiltration membranes were thoroughly investigated. The membrane with 1.0 wt% PVP and 0.8 wt% PVA showed superior separation performance and antifouling properties.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Xinxing Hao, Zhe Zhu, Zhonghua Yao, Hua Hao, Minghe Cao, Hanxing Liu
Summary: This study investigates the effect of polarization difference on the energy storage density of dielectric materials and finds that excess Ti can optimize the dielectric characteristics. The study also highlights the importance of polarization difference in achieving high energy storage density in electrostatic dielectric capacitors.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Bongho Jang, Jaewon Jang, Jae Eun Jang, Hyuk-Jun Kwon
Summary: This study fabricated high-performance SnO2 thin-film transistors (TFTs) at temperatures below 300 degrees C using the combustion-assisted sol-gel method. The results showed that the combustion-assisted solution process significantly increased the field-effect mobility of SnO2 TFTs compared to the conventional solution process, potentially enabling low-cost solution-processed electronics.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
M. Chakraborty, E. S. Kadir, R. N. Gayen
Summary: By varying the graphene oxide (GO) content, the modification of UV photo-response characteristics in transparent titanium dioxide-graphene oxide (TiO2-GO) nanocomposite thin films was studied. The presence of GO improves the optical band gap of TiO2 without affecting its transparency. The fabricated metal-semiconductor (MS) Schottky junctions with TiO2-GO nanocomposite thin films show rectifying behavior and improved UV response characteristics.
CERAMICS INTERNATIONAL
(2023)
Review
Chemistry, Physical
Daniel Alves Barcelos, Maria Clara Goncalves
Summary: Visible-light-photoactive titania micro- or nanoparticles have shown great potential in various industrial applications, especially in environmental remediation. The sol-gel method, with its simplicity, versatility, and green chemistry approach, has been successfully employed for synthesizing crystalline and amorphous TiO2 micro- and nanoparticles. This short review aims to discuss the recent advancements in visible-light-photoactive titania-based nanoparticles for environmental remediation. Co-doping of titania, titania composite design, and the use of amorphous networks have been the most commonly used strategies to achieve this goal. Finally, predictions about the future developments in these fields are provided.
Article
Chemistry, Multidisciplinary
Pritha Biswas, Tamara D. Koledin, Skylar N. Farmer, Melissa K. Santala, Janet Tate
Summary: The transformation from amorphous to crystalline in TiO2 films in air leads to different polymorphs, which can be manipulated by introducing Sn into the system. Sn stabilizes the rutile structure at the Sn/TiO2 interfaces by scavenging oxygen, resulting in rutile formation.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
Yanjiang Xie, Hua Hao, Zhengtao Huang, Shuo Zhang, Minghe Cao, Zhonghua Yao, Hanxing Liu
Summary: In this study, Fe-doped 0.94BNT-0.06BT ferroelectric thin films were prepared and demonstrated improved dielectric and energy-storage performances. The 0.96BNT-0.04BT-Fe-2 thin film exhibited the best properties among the samples studied.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Jingwei Zhao, Zhonghua Yao, Zhijian Wang, Ning Zhang, Hua Hao, Minghe Cao, Hanxing Liu
Summary: By employing microstructural engineering, an optimized lead-free Zr-modified BiMg0.5Zr0.04Tix-0.04O3 composition was developed to enhance energy storage behavior, achieving superior energy properties and high efficiency. Rapid annealing and excess Ti source doping effectively increased polarization and dielectric breakdown levels.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Renzhong Xue, Liuyang Zhao, Siyuan Chen, Hongxuan Chen, Mengru Cui, Xintao Bai, Tao Li, Dewei Liu, Haiyang Dai
Summary: The effects of A-site transition from Ca2+ to Cd2+ on the microstructure, morphology, and electrical properties of Ca(1-x)CdxCu(3)Ti(4)O(12) thin films were investigated. The films exhibited smooth and compact surfaces without cracks. The transition from Ca2+ to Cd2+ resulted in changes in grain size and electrical properties. In particular, the simultaneous occupancy of A sites by Ca2+ and Cd2+ improved the dielectric and nonlinear properties of Ca1-xCdxCu3Ti4O12 films.
CERAMICS INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Ibrahim Moussa, Hassan Ibrahim, El-Amir M. Emam, Tawfik M. Tawfik
Summary: A facile and green sol-gel method was used to synthesize carbon-containing titania nanopowder, and the effects of different heat treatment temperatures on the crystalline phases were investigated. High-resolution electron microscopy and X-ray photoelectron spectroscopy confirmed the presence of nanocrystals and carbon clusters in the samples. UV-vis spectroscopy demonstrated significant enhancement in the optical absorption properties and electronic structure of the prepared samples compared to pure titania phases. Additionally, a self-cleaning action was demonstrated in the carbon-containing titanate nanocomposite.
Article
Nanoscience & Nanotechnology
Christina Schippers, Jochen S. Gutmann, Larisa A. Tsarkova
Summary: Additives such as poly(butylene succinate) and poly(D-lactic acid) were used to enhance the properties of poly(lactic acid) fibers. The study investigated the physical and structural properties of these fibers before and after aging, and found that while the additives improved elasticity and ductility, they also decreased hydrolytic resistance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Paper & Wood
Wael Ali, Olga Zilke, Dominic Danielsiek, Alaa Salma, Bassem Assfour, Valbone Shabani, Seden Caglar, Hung Minh Phan, Leonie Kamps, Ruth Wallmeier, Ying Feng, Torsten Textor, Jochen S. Gutmann, Thomas Mayer-Gall
Summary: DOPO-ETES and DOPO-AmdPTES were synthesized as halogen-free flame retardants without by-products. They were applied on cotton fabric using sol-gel method and pad-dry-cure finishing process. DOPO-AmdPTES-treated cotton exhibited self-extinguishing behavior with high char residue, improved LOI value and reduced PHRR, HRC and THR compared to untreated cotton. DOPO-AmdPTES-treated cotton showed semi-durability after ten laundering cycles. According to the results, the flame retardant activity occurred in the condensed phase as a physical barrier and in the gas phase through dilution effect.
Article
Chemistry, Applied
Philipp Knospe, Rene Reichmann, Jochen S. Gutmann, Michael Dornbusch
Summary: The isocyanate group is often blocked to prevent reaction with moisture, but current blocking agents have limitations. This study explores the use of vanillin as a deblocking agent at low temperatures, and its effectiveness is compared with similar structures. The deblocking process is analyzed through IR-spectroscopic measurements and thermogravimetric analysis, while temperature-dependent oscillation measurements are used to track the unblocking process. The results suggest that vanillin is a suitable blocking agent for isocyanates, enabling the production of crosslinkers for water-based coatings.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2023)
Article
Polymer Science
Qunying Wang, Sergey Popov, Veronika Strehmel, Jochen S. Gutmann, Bernd Strehmel
Summary: A series of cyanines with varying methine chain lengths and terminal groups were reacted with a specific cation after excitation in the NIR region, resulting in the generation of free radicals and conjugate acids. This study investigated the efficiency of free radical and cationic polymerization, as well as their combination as a hybrid system. By using NIR-LED exposure and varying the sensitizers, different photopolymerization efficiencies were achieved. The results showed that the combination of free radical and cationic polymerization can work effectively in hybrid systems.
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)
Review
Energy & Fuels
Kun Sun, Peter Mueller-Buschbaum
Summary: This article reviews the effects of moisture on halide perovskite films, including the degradation mechanism and methods to enhance stability. The benefits of incorporating a certain amount of water into perovskite films are discussed, as well as the moisture-induced structural degradation and decomposition process. The methods to enhance moisture stability, particularly 3D/2D heterostructures, are also highlighted.
Article
Chemistry, Multidisciplinary
Muhammad Usman Munir, Thomas Mayer-Gall, Jochen S. Gutmann, Wael Ali, Omid Etemad-Parishanzadeh, Haleema Khanzada, Daiva Mikucioniene
Summary: The COVID-19 pandemic has led to an increase in the usage of disposable personal protective equipment (PPE), resulting in increased waste and environmental impact. In this study, the researchers propose the use of a sustainable electrospun nanofiber made of poly lactic acid (PLA), which is biobased and conditionally degradable. They optimized the PLA-precursor solution and found that 19% PLA produced fine nanofibers with good morphology. The addition of carbon nanodots (CNDs) increased the antibacterial efficiency of the nanofibers. They also successfully applied a spunbond-nanofiber layered assembly for medical face masks, meeting the basic requirements for Type I medical face masks (ASTM-F2100).
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
Anna Lena Oechsle, Tobias Schoener, Lewin Deville, Tianxiao Xiao, Ting Tian, Apostolos Vagias, Sigrid Bernstorff, Peter Mueller-Buschbaum
Summary: The influence of humidity on the resistance properties of post-treated PEDOT:PSS films was investigated. It was found that elevated humidity increased the resistance of reference samples without post-treatment, while the post-treated samples showed a reverse behavior. Morphological changes in the film, such as increased PEDOT domain distances, were observed with in situ GISAXS measurements. This led to a deterioration in interdomain hole transport and a rise in resistance. Additionally, EIS measurements revealed additional contributions of ionic charge carriers in the post-treated PEDOT:PSS films.
ACS APPLIED MATERIALS & INTERFACES
(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)