Article
Nanoscience & Nanotechnology
Shan Du, Tiantian He, Guang Yang, Huali Nie
Summary: This study presents a new strategy for surface coating of wigs using a nanocomposite of hair-derived keratin and graphene oxide via the LB technique. Compared to the conventional immersion method, this strategy achieves higher surface coverage and a close-packed structure, resulting in improved performance and durability.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Biochemistry & Molecular Biology
Ki-Wan Jeon
Summary: The study reports the synthesis and fabrication of highly thionated reduced graphene oxide and its LB film, revealing sensitive electronic transport properties and optical characteristics of the film to the thiol content.
Article
Chemistry, Multidisciplinary
Chun-Li Luo, Jun-Yi Jiao, Xing-Jie Su, Lin-Xin Zheng, Wei-Guo Yan, Dong-Zhou Zhong
Summary: Researchers developed interlinked microcone resistive sensors using polydimethylsiloxane (PDMS) nanocone arrays and self-assembled two-dimensional carbon nanotubes (CNTs) networks. These sensors can detect external pressure with high sensitivity and stability in a wide range of pressures, making them promising for monitoring human motion and wearable devices.
Article
Chemistry, Analytical
Chenfang Sun, Rui Li, Yaru Song, Xiaoqian Jiang, Congcong Zhang, Shanshan Cheng, Wenping Hu
Summary: A novel organic material, BFPA, has been developed for OFET-based biosensors, enabling ultrasensitive determination of AFP in human serum and differentiation between liver cancer patients and healthy individuals.
ANALYTICAL CHEMISTRY
(2021)
Article
Materials Science, Coatings & Films
Dandan Wei, Yuntong Chu, Qing Sun, Hongjie Ding, Cong Wang, Huali Nie
Summary: Graphene oxide/copper ion (GO/Cu2+) complex was coated on Kirschner wires (K-wires) surface via Langmuir-Blodgett (LB) assembly to provide antibacterial and biocompatible properties. The LB strategy allowed control over the coating microstructure, enabling adjustable GO/Cu2+ loading and sustained release behavior. The GO/Cu2+ coating exhibited inherent antibacterial properties in vitro and in vivo due to the sharp-edged sheet structure of GO, membrane stress, and the generation of reactive oxygen species (ROS). MC3T3-E1 cells on modified K-wires showed enhanced adhesion, migration, and proliferation abilities, attributed to the physical structure and chemical properties of the GO/Cu2+ coating. Modified K-wires have potential as antimicrobial materials for orthopedic surgery.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Chenglong Cai, Ting Wang, Yixin Zhang, Nongyue He
Summary: The macroscopic ensembles of graphene are important for applications such as electromagnetic-interference shielding, thermal control, and sensors. A one-step strategy was developed to produce ultra-large neat graphene oxide film with excellent thermal conduction and photothermal conversion properties. By modifying the substrate with different concentrations of APTEs, defects in the UN-GO film structure were avoided, leading to improved thermal conductivities.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Samapika Mallik, K. Swamynathan, Sandeep Kumar, Alpana Nayak
Summary: The study demonstrates the use of DNA-guided molecular assembly as a technique for modern organic device engineering. By utilizing DNA as a polyelectrolyte, the formed monolayer showed enhanced stability and efficiency in deposition on solid supports. This approach has the potential for applications as functional materials in organic electronics due to the technological relevance of the molecules involved.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Multidisciplinary
Vengadesh Periasamy, Muhammad Musoddiq Jaafar, Karthikeyan Chandrasekaran, Sara Talebi, Fong Lee Ng, Siew Moi Phang, Georgepeter Gnana Kumar, Mitsumasa Iwamoto
Summary: The prevalence of photosynthesis and its potential as a renewable energy source has led to the development of solid-state semiconductive devices like photovoltaic solar cells. However, direct utilization of plant-based biophotovoltaics (BPV) has been impracticable. In recent years, fuel cells (FCs) relying on redox potentials of algae suspensions or biofilms have shown promise as clean power generators. These algal BPVs offer advantages such as carbon sequestration and biomass harvesting. Development of high-performance BPVs is reliant on upgraded anode materials with dynamically nanostructured surfaces, but challenges in optimizing these materials hinder commercial viability. Graphene-based carbonaceous materials have been explored for FCs due to their flexible surface functionalization properties, but disorders on the molecular scale restrict efficient charge coupling. Langmuir-Blodgett (LB) film has shown potential in addressing these limitations, but its application in BPVs remains untapped. A comprehensive understanding of LB film fabrication and electron transfer mechanisms is crucial for the scalability of BPVs.
Article
Chemistry, Multidisciplinary
Michal Swierczewski, Plinio Maroni, Alexis Chenneviere, Mohammad M. Dadras, Lay-Theng Lee, Thomas Burgi
Summary: The Langmuir-Blodgett technique is used to deposit ultrathin films of Au-38(SC2H4Ph)(24) nanoclusters onto solid surfaces, such as mica and silicon. The morphology of the films transferred at different surface pressures in the mono/bi/trilayer regime is studied using atomic force microscopy. The effect of the time spent on the water surface before deposition on the final ordering of nanoclusters within the network is investigated using fast AFM, X-ray reflectivity, and grazing-incidence wide-angle X-ray scattering.
Article
Polymer Science
Thiers M. Uehara, Fernanda L. Migliorini, Murilo H. M. Facure, Nicolau B. Palma Filho, Paulo B. Miranda, Valtencir Zucolotto, Daniel S. Correa
Summary: The study investigates the application of graphene oxide (GO) in medical devices, focusing on its interactions with liver cancer cells on different scaffold platforms. Spectroscopic and electrochemical analysis reveal the characteristics of GO-cell interactions, providing insights for regenerative medicine research.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Lennart Graewe, Maximilian L. L. Hupfer, Martin Schulz, Atif Mahammed, Zeev Gross, Martin Presselt
Summary: Amphiphilic iron(III) corroles are assembled into well-defined quasi-two-dimensional molecular monolayers at air-water interfaces using the Langmuir-Blodgett (LB) technique. The optical density of the stacks of molecular monolayers allows for photometric detection of nitric oxide (NO) binding. The highest molecular efficiency for NO binding and detection is achieved at the smallest packing densities.
Article
Materials Science, Multidisciplinary
Cong Zhao, Kun Hu, Fang-mei Li, Min-xing Li, Song Li, Yu-fei Zhai, Wei-wei Deng, Hong-yu Yu, Min Wang
Summary: In this work, a flow driven self-assembly approach was employed to prepare highly oriented woven Ag-NW grids, resulting in flexible transparent electrodes with remarkable mechanical performance and low sheet resistance. Through selective deposition and elastomer transferring processes, TE devices with excellent mechanical properties were successfully obtained. The fabricated electrodes exhibited uniform electroluminescence under both flat and bending states, indicating their promising potential for flexible optoelectronic applications.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yong Liu, Wei-Guo Liu, Da-Bin Lin, Xiao-Ling Niu, Shun Zhou, Jin Zhang, Shao-Bo Ge, Ye-Chuan Zhu, Xiao Meng, Zhi-Li Chen
Summary: Vinylidene fluoride and trifluoroethylene (P(VDF-TrFE)) films are widely used in various applications due to their high electroactive, optical, and nonlinear optical properties. In this study, multilayer structured ultrathin films were fabricated using the Langmuir-Blodgett technique with accurate control over the thickness per layer. The films exhibited high density when the collapse pressure and optimal dipping value of P(VDF-TrFE) (25:75) were 60~70 mN/m and 15 mN/m, respectively. The surface topography and optical properties of the LB films were characterized, showing transparency in the visible and IR regions but high absorption in the UV region. The transmittance of the films ranged from 50% to 85% in the visible region and decreased linearly with the number of monolayers.
Article
Chemistry, Multidisciplinary
Elizaveta A. Gusarova, Alexandra I. Zvyagina, Alexey E. Aleksandrov, Alexey A. Averin, Alexey R. Tameev, Maria A. Kalinina
Summary: A combinatorial method was used to fabricate functionally different 2D hybrids using the same starting set of components. The hybrids were assembled into layered nanofilms and integrated into conventional ITO-based cells. Depending on their composition, the hybrids exhibited different operational characteristics, such as photovoltaic properties or monopolar conductive layers. The strategy can be easily applied to create various hybrid nanofilms with targeted functional properties for organic electronics.
NEW JOURNAL OF CHEMISTRY
(2023)
Review
Nanoscience & Nanotechnology
Chen Fang, Insun Yoon, Dion Hubble, Thanh-Nhan Tran, Robert Kostecki, Gao Liu
Summary: This article discusses the application of Langmuir-Blodgett (LB) technique in battery research. The LB technique allows efficient fabrication of highly ordered thin films and is applicable to various substances. However, the LB strategy has not been extensively employed in battery studies. The article highlights the versatility of LB films and their potential in advancing battery chemistry.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Hwansoo Shin, Wonsik Eom, Ki Hyun Lee, Woojae Jeong, Dong Jun Kang, Tae Hee Han
Summary: MXene nanosheets self-assembled into hydrogels can be spun into highly aligned fibers with increased electrical conductivity and Young's modulus. These oriented MXene fibers are expected to have widespread applications in electrical wiring and signal transmission.
Article
Polymer Science
Jae Sik Seo, Ho Tak Jeon, Tae Hee Han
Summary: The study investigated the morphologies and physical properties of twin-screw-extruded polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends with different blend ratios. It was found that with an increase in ABS content, the phase structure in PC-rich blends transitioned from needle-like to sea-island, leading to significant changes in the rheological properties of the blends.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Chemistry, Physical
Jae Sik Seo, Ho Tak Jeon, Tae Hee Han
Summary: The study investigates the interface between metal layers and ABS substrates as well as the peeling mechanism, with etching time affecting both parameters. By using the S-dr ratio as a new surface parameter, it is possible to predict the peel-off strength of electroplated ABS.
SURFACES AND INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Sung Hyun Noh, Hak Bong Lee, Kyong Sub Lee, Hyeonhoo Lee, Tae Hee Han
Summary: In this study, a novel and scalable direct-hybridization method was developed for the fabrication of high-performance fiber-shaped supercapacitors (FSSCs). The researchers successfully anchored ruthenium hydroxide to the surface of graphene fibers and converted it into ruthenium oxide nanoparticles, without causing structural damage to the fibers. The resulting fibers showed increased gravimetric capacitance and excellent cyclic stability, while maintaining good mechanical flexibility.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Hak Bong Lee, Ganesh Kumar Veerasubramani, Kyong Sub Lee, Hyeonhoo Lee, Tae Hee Han
Summary: This study introduces a novel Joule-heating approach for manufacturing high-performance hybrid supercapacitors, and contributes to the development of fast, scalable, and cost-effective techniques for fabricating flexible, portable, and wearable fiber-based electrodes.
Article
Polymer Science
Hak Bong Lee, Kyong Sub Lee, Seok Jun Kim, Byung Il Choi, Byung Rye Go, Chan Joo Rhu, Tae Hee Han
Summary: Increased demand for plastics leads to inappropriate disposal and the production of microplastics, which pose hazardous effects to the ecosystem. Chemical resistance of microplastics to strong acids, bases, and oxidizing agents varies among different types of plastic.
Article
Chemistry, Multidisciplinary
Hwansoo Shin, Hyeonhoo Lee, Yeongbhin Seo, Woojae Jeong, Tae Hee Han
Summary: Surface modification is a simple strategy to enhance the oxidation stability and dispersibility of MXene in different organic media, and oleylamine (OAm) is a suitable ligand due to its strong interactions and commercial availability. The grafting of OAm onto MXene is achieved through covalent bonds and H bonds, and the behavior is similar to Langmuir adsorption. The OAm-MXene nanosheets exhibit excellent dispersion and coating performance, making them suitable for various applications.
Article
Chemistry, Multidisciplinary
Tae Hyung Kim, Inho Park, Kyeong Ho Lee, Jin-Han Sim, Min-Ho Park, Tae-Hee Han, Ungyu Paik, Jaeyoung Jang, Ho Bum Park, Young-Hoon Kim
Summary: Solvent-free reduction of CO2 using amorphous TiOx with embedded colloidal perovskite nanocrystals (PNCs) has been achieved by carrying out hydrolysis of titanium butoxide (TBOT) on the PNC surface. The photoexcited electrons are transferred from PNCs to TBOT, enabling photocatalytic reactions using TiOx under visible-light excitation. Efficient visible-light-driven photocatalytic reactions at PNC/TiOx interfaces, with a CO production rate of 30.43 µmol g(-1) h(-1) and accelerated degradation of organic pollutants under natural sunlight, have been demonstrated.
Article
Physics, Applied
Wonsik Eom, Hwansoo Shin, Tae Hee Han
Summary: The transitions of Ti3C2Tx MXene during thermal annealing were investigated using x-ray photoelectron spectroscopy and two-dimensional correlation spectroscopy. The thermal evolution of MXene occurs in two distinct processes: process I (25-500 ?) and process II (500-777 ?). In process I, the reduction of terminal groups and release of fluorine (-F) groups occur. Four different pathways with C-Ti-O and C-C as probable final products are identified. In process II, the reaction resulting in the removal of -F species and decomposition of the Ti3C2 region in the MXene is observed. These findings provide insights into the thermal decomposition behavior of Ti3C2Tx MXene for the design of MXene-based materials with specific functionalities.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Dong Jun Kang, Ki Hyun Lee, Sung Hyun Noh, Hwansoo Shin, Woojae Jeong, Hyeonhoo Lee, Yeongbhin Seo, Tae Hee Han
Summary: A Joule heater made of 2D nanosheets MXene with a graphene skin coating was developed to improve its oxidative stability and heating efficiency. The graphene skin layer enhanced the water impermeability of the MXene film and provided longer-lasting protection. The combination of the graphene skin and MXene resulted in a heating material with a tractable voltage range and high Joule heating efficiency.
Article
Nanoscience & Nanotechnology
Rohan B. Ambade, Mumtaz Ali, Ki Hyun Lee, Woojae Jeong, Sung Hoon Jeong, Tae Hee Han
Summary: In this study, nitrogen and sulfur co-doped carbon quantum dots (NS-CQDs) were developed and doped into TiO2-rGO nanocomposites on a flexible carbon fabric substrate for efficient solid-state photocatalytic activity. The NS-CQD-rGO-TiO2 nanocomposites exhibited improved photocatalytic degradation of organic pollutants compared to conventional N-doped CQDs-rGO-TiO2, thanks to NS co-doping, ultrasmall nanoparticle morphology, mesoporous structure, modified bandgap, and the resulting mixed-phase TiO2.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Wonsik Eom, Hwansoo Shin, Woojae Jeong, Rohan B. Ambade, Hyeonhoo Lee, Tae Hee Han
Summary: Investigated the effect of chemical modification on the electron-transfer behavior during the removal of the terminal groups in MXenes. Annealing in ammonia gas enhances the electrical conductivity and chemical stability of MXene materials.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Physical
Ki Hwan Koh, Amir Hassan Bagherzadeh Mostaghimi, Qiaowan Chang, Yu Joong Kim, Samira Siahrostami, Tae Hee Han, Zheng Chen
Summary: This study demonstrates that precise modulation of the chemistry and structures of holey graphene with oxygen-containing functional groups can facilitate 2e(-) ORR reaction, enabling efficient H2O2 synthesis. The research provides an effective approach to enhance the ORR performance in alkaline media, with high selectivity and Faraday efficiency.
Article
Chemistry, Multidisciplinary
Rohan B. Ambade, Ki Hyun Lee, Dong Jun Kang, Tae Hee Han
Summary: This article summarizes the synthesis methods and applications of two-dimensional holey graphene and three-dimensional porous graphene, as well as their potential in electronic devices and energy storage. In addition, wet-spinning processes for fabricating fiber electrodes and the prospects of wet-spun holey/porous graphene-based nanomaterials in wearable electronic devices are discussed.
ACCOUNTS OF MATERIALS RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Ki Hwan Koh, Yu Joong Kim, Amir Hassan Bagherzadeh Mostaghim, Samira Siahrostami, Tae Hee Han, Zheng Chen
Summary: This study investigates the effects of nitrogen and oxygen doping on carbon-based electrocatalysts for oxygen reduction reaction. The coupling of nitrogen with carbonyl oxygen is found to have the most favorable performance for the two-electron reaction.
ACS MATERIALS LETTERS
(2022)
