Article
Chemistry, Physical
Sulakshana Mondal, Durga Basak
Summary: This study investigates the photosensitivity of Ag-TiO2 composite films and finds that the combination of Ag nanoparticles on TiO2 films enables high broad band photosensitivity from UV to visible wavelength. The transfer of hot electrons from Ag nanoparticles to TiO2 enhances the overall photosensitivity. However, the thickness increase of Ag nanoparticles on TiO2 affects the photosensitivity negatively due to aggregation of the metal particles.
SURFACES AND INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Xiaodong He, Kasi Gopinath, Gnanasekar Sathishkumar, Lingli Guo, Kai Zhang, Zhisong Lu, Changming Li, En-Tang Kang, Liqun Xu
Summary: The study demonstrates the synthesis of natural polyphenol tannic acid-capped silver nanoparticles for antibacterial surface coatings, showing significant antibacterial effects both in vitro and in vivo. The functionalized surfaces exhibit minimal cytotoxicity and no side effects on major organs after implantation, indicating their biocompatibility for potential biomedical applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Chi Pang, Rang Li, Jiawei Huang, Ziqi Li, Ming Chen, Ningning Dong, Jun Wang, Feng Ren, Feng Chen
Summary: The study improved the electron transfer mechanism of TiO2 by embedding Ag NPs, enhancing optical nonlinearity. Low-threshold mode-locked lasers were achieved using AgNP:TiO2, paving the way for potential applications in ultrafast dynamics and optoelectronics.
APPLIED SURFACE SCIENCE
(2021)
Article
Energy & Fuels
I. H. K. Madigasekara, H. C. S. Perera, J. M. K. W. Kumari, G. K. R. Senadeera, M. A. K. L. Dissanayake
Summary: By incorporating Ag/AgBr/TiO2 nanocomposites into the DSC active material, the synthesized material achieved a significant increase in power conversion efficiency. This enhanced efficiency is attributed to the synergistic effects of AgBr and metallic Ag, with AgBr showing high efficiency in generating electron-hole pairs under visible light.
Article
Chemistry, Multidisciplinary
Chadrasekhar Loka, Kee-Sun Lee
Summary: Ag-Ag2O-ZnO nanocomposite with localized surface plasmon resonance (LSPR) and p-n heterojunction structure was synthesized by hydrothermal process, which effectively improved the photocatalytic efficiency and suppressed the recombination of photogenerated electron-hole pairs. The nanocomposite exhibited excellent photocatalytic activity and achieved high degradation efficiency for different dyes under visible-light irradiation.
Article
Chemistry, Physical
Pejman Hajipour, Abbas Bahrami, Maryam Yazdan Mehr, Willem Dirk van Driel, Kouchi Zhang
Summary: This study investigated the photocatalytic characteristics of Ag nanowire/TiO2 and Ag nanowire/TiO2/graphene oxide nanocomposites. Through direct coating of TiO2 particles on silver nanowires, successful deposition of TiO2 nanoparticles on the surface of Ag nanowires was confirmed. The synthesized Ag nanowire/TiO2/graphene oxide nanocomposite exhibited superior photocatalytic activities in decomposing Rhodamine B.
Article
Nanoscience & Nanotechnology
Devarajulu Gelija, Chadrasekhar Loka, Mahendra Goddati, Na-hyun Bak, Jaebeom Lee, Moon-Deock Kim
Summary: A Ag/WO3/InGaN hybrid heterostructure was successfully developed, which exhibited superior photoabsorption ability in the visible region. The improved charge carrier separation and transfer kinetics lead to enhanced overall photoelectrochemical performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Optics
Jun Li, Mingjing Xu, Jiaxin Liu, Hao Li, Hongbin Song, Ai Zhou
Summary: We proposed a highly sensitive surface plasmon resonance temperature sensor by adjusting parameters and coating the surface to enhance temperature sensitivity. The simulation results showed that the sensor had a temperature sensitivity of -16.26 nm/°C at 20°C and a high DSD-FOM in the range of 20°C-70°C.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Yanfen Wang, Haocheng Yang, Hai Yun, Juan Gao, Yin Liu, Miao Zhang, Gang He, Zhaoqi Sun
Summary: The plasmonic Ag@AgBr nanoparticles were successfully synthesized on a TiO2 nanorod array through a secondary hydrothermal method. The crystallization time of Ag@AgBr was found to significantly affect the crystallinity, size, and optical properties of the ternary arrays. With an increase in crystallization time, the crystalline behavior of Ag@AgBr improved, leading to larger nanoparticles and a redshift in the surface plasmon resonance bands. The Ag@AgBr/TNR arrays exhibited enhanced photocatalytic efficiency in the degradation of methyl orange due to the synergistic effect of improved solar light response and efficient charge transfer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Elham Montakhab, Fereshteh Rashchi, Saeed Sheibani
Summary: The study investigated the photocatalytic activity of modified TiO2 nanotubes (TNTs) for water purification. Three modification methods including Ag nanoparticles (NPs) decoration (TNT-Ag), electrochemical reduction of the TNTs (TNT-H), and a simultaneous combination of these two methods (TNT-Ag-H) were studied. It was found that the combined method resulted in finer Ag NPs with better distribution due to the preferred sites for Ag nucleation provided by the defects formed during electrochemical reduction. The modified TNTs in the TNT-Ag-H sample showed increased SPR and absorption in the visible light region, and exhibited higher photocatalytic performance compared to unmodified TNT samples.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
J. Naseer, R. Namachivayam, D. Manikandan, S. Jeyaram, S. Periandy
Summary: Nanoscale silver and copper clusters are prepared in soda-lime glass through sequential ion-exchange technique and thermal annealing process. The optical absorption and photoluminescence spectra confirm their presence, and their temperature-dependent emission peak shift makes them promising materials for temperature sensors.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Coatings & Films
J. A. Lenis, Elbert Contreras Romero, Abel Hurtado Macias, P. Rico, J. L. Gomez Ribelles, M. A. Pacha-Olivenza, M. L. Gonzalez-Martin, F. J. Bolivar
Summary: In this study, the surface of Ti6Al4V alloy, commonly used in implant fabrication, was modified with a novel biocompatible and antibacterial coating composed of multiple layers of hydroxyapatite (HA) and Ag. The coatings were characterized for their chemical and phase compositions, as well as their structural, topographical, and morphological properties. Mechanical properties were determined, and the biological response was evaluated using cell viability tests and bacterial viability tests. The results show excellent chemical and compositional control of the coatings, as well as high antibacterial potential and biocompatibility.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Engineering, Environmental
Yong-Ming Dai, Chen-Yin Li, Wei -Ho Ting, Jih-Mirn Jehng
Summary: By adjusting the mass ratio of two components, AgVO3 and TiO2 nanowires, an optimized AgVO3/Ag/TiO2 nanowires composite material is successfully fabricated. The composite material exhibits enhanced photocatalytic performance due to improved utilization of light, efficient separation and transfer of photogenerated electron-hole pairs. Additionally, the surface plasmon resonance effect of the composite material also facilitates the photocatalytic reaction.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Hongxu Chen, Xing Li, Yu Wang, Yan Li, Yingfeng Yu, Haidong Li, Baoqing Shentu
Summary: Colloidal lithography was used to design and construct a high-performance plasmonic sensor based on Ag nanocone arrays embedded with Ag NPs. By carefully tuning the nanocone sizes, the reflectance troughs were considerably enhanced, leading to improved line shape and sensitivity of the sensor. Experimental findings confirmed the feasibility of this sensor.
Article
Materials Science, Multidisciplinary
Xiang-Dong Jiang, Wen-Rui Xu, Nasir Ilyas, Ming-Cheng Li, Rui-Kang Guo, Rajwali Khan, Wei Li, Ji-Min Wang
Summary: The CPWR-based optical sensor shows superior sensitivity and figure of merit compared to traditional sensors, and can be tuned to the near-infrared region by adjusting structural parameters.
RESULTS IN PHYSICS
(2021)
Article
Physics, Applied
Jonas Drewes, Suren Ali-Ogly, Thomas Strunskus, Oleksandr Polonskyi, Hynek Biederman, Franz Faupel, Alexander Vahl
Summary: The study utilized in situ UV-Vis spectroscopy to investigate how the growth and transport of nanoparticles inside a gas aggregation source (GAS) were influenced by the Ar gas flow and operating pressure. It was found that the distribution of gas flow velocity strongly impacted the movement of nanoparticles and their positions inside the GAS depended on the gas flow. Computational fluid dynamic simulations were also conducted to identify areas where nanoparticles could be trapped or lost inside the GAS.
PLASMA PROCESSES AND POLYMERS
(2022)
Article
Chemistry, Analytical
Ron-Marco Friedrich, Franz Faupel
Summary: Imaging of magnetic nanoparticles is important in medical sciences. A resonant magnetoelectric sensor can measure and map the distribution of the nanoparticles, but accurate modeling and accounting for sources of uncertainty are crucial for proper reconstruction.
Article
Multidisciplinary Sciences
Maik-Ivo Terasa, Pia Holtz, Niko Carstens, Soren Kaps, Franz Faupel, Alexander Vahl, Rainer Adelung
Summary: This work introduces a novel lateral geometry memristor that combines the capabilities of bipolar switching and decelerated diffusive switching, displaying biologically plausible short-term memory. The lateral memristor, fabricated using carbon nanotubes and AgAu nanoparticles, exhibits a hybrid behavior of diffusive and bipolar switching, with a retention time positively correlated to the duration of the Set voltage pulse. With potential for low-voltage operation, it is a promising candidate for short-term memory applications in neuromorphic circuits.
Article
Chemistry, Multidisciplinary
Josiah Shondo, Salih Veziroglu, Tim Tjardts, Jacek Fiutowski, Stefan Schroeder, Yogendra Kumar Mishra, Thomas Strunskus, Horst-Guenther Rubahn, Franz Faupel, Oral Cenk Aktas
Summary: A multifunctional surface that provides highly selective oil sorption and clean-up capability via photocatalytic decomposition is proposed. This surface shows high removal efficiency and low cost, making it suitable for applications in water treatment and self-cleaning.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Suzhe Liang, Tianfu Guan, Shanshan Yin, Eva Krois, Wei Chen, Christopher R. Everett, Jonas Drewes, Thomas Strunskus, Marc Gensch, Jan Rubeck, Christoph Haisch, Matthias Schwartzkopf, Franz Faupel, Stephan Roth, Ya-Jun Cheng, Peter Mueller-Buschbaum
Summary: Ordered porous gold/titanium dioxide (Au/TiO2) hybrid nanostructured films were investigated for their optical response and application as molecular sensors. The study found that the Raman intensity is influenced by the thickness of deposited Au and a maximum intensity is observed at an effective Au thickness of 3.4 nm. The growth kinetics of Au on a TiO2 template during sputter deposition were analyzed using in situ grazing-incidence small-angle X-ray scattering (GISAXS), providing insights for tailoring the Au/TiO2 nanohybrid thin films for surface-enhanced Raman scattering (SERS) applications.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
S. Schroeder, N. Ababii, O. Lupan, J. Drewes, N. Magariu, H. Krueger, T. Strunskus, R. Adelung, S. Hansen, F. Faupel
Summary: A new type of moisture protected gas sensor is introduced in this study, utilizing a special coating to protect the sensor from moisture. Compared with unprotected sensors, the coated sensors show better performance at higher humidity levels, with increased gas selectivity tunability.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Chemistry, Physical
Jonas Drewes, Stefan Rehders, Thomas Strunskus, Holger Kersten, Franz Faupel, Alexander Vahl
Summary: Gas phase synthesis of nanoparticles via magnetron sputtering in a gas aggregation source is a well-established method, but the complex non-equilibrium processes involved in nanoparticle formation and transport are still the subject of investigation. In situ investigation techniques have provided further insights into the dynamic processes inside the gas aggregation source, revealing the impact of different gas inlet configurations on nanoparticle trapping behavior.
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
(2022)
Article
Chemistry, Multidisciplinary
Josiah Shondo, Salih Veziroglu, Tim Tjardts, Tamim Bin Sarwar, Yogendra Kumar Mishra, Franz Faupel, Oral Cenk Aktas
Summary: A 4N-in-1 hybrid substrate concept for ultra-sensitive and reliable photo-induced-enhanced Raman spectroscopy is proposed, which shows a significant enhancement and high detection sensitivity. The substrate also exhibits superior photocatalytic degradation performance and reusability.
Article
Polymer Science
Stefan Schroeder, Nicolai Ababii, Mihai Brinza, Nicolae Magariu, Lukas Zimoch, Mani Teja Bodduluri, Thomas Strunskus, Rainer Adelung, Franz Faupel, Oleg Lupan
Summary: Metal oxide gas sensors have superior properties in terms of sensitivity, lifetime, cost and portability, making them highly valuable for various applications. However, their selectivity, gas response and energy consumption influenced by ambient gases still need improvement and are being extensively researched. This study presents a simple approach to enhance the selectivity of gas sensing structures using an ultrathin polymer thin film, resulting in improved selectivity to specific vapors of volatile organic compounds. This research demonstrates the possibilities of enhancing the properties of metal oxide gas sensors, which is crucial in fields such as medicine, security and food safety.
Article
Chemistry, Multidisciplinary
Oguz Han Asnaz, Jonas Drewes, Marie Elis, Thomas Strunskus, Franko Greiner, Oleksandr Polonskyi, Franz Faupel, Lorenz Kienle, Alexander Vahl, Jan Benedikt
Summary: A novel combined setup of a Haberland type gas aggregation source and a secondary radio frequency discharge is used to generate, confine, and coat nanoparticles over much longer time scales than traditional in-flight treatment. The process is precisely monitored using localized surface plasmon resonance and Fourier-transform infrared spectroscopy as in situ diagnostics. Surface coating is shown to occur in two phases: first, singular seeds appear on the particle surface which then grow to cover the entire particle surface over 3 to 5 minutes.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Igor Barg, Niklas Kohlmann, Florian Rasch, Thomas Strunskus, Rainer Adelung, Lorenz Kienle, Franz Faupel, Stefan Schroeder, Fabian Schuett
Summary: This work demonstrates a novel concept for the development of strain-invariant, highly elastic and highly water stable all-organic soft conductors, overcoming the limitations of previous strain-invariant soft conductors. The thin film structure has highly hydrophobic properties, resulting in stable electrical properties even when immersed in water for a month.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Analytical
Mihai Brinza, Stefan Schroeder, Nicolai Ababii, Monja Gronenberg, Thomas Strunskus, Thierry Pauporte, Rainer Adelung, Franz Faupel, Oleg Lupan
Summary: Certain molecules in exhaled breath or outgassing vapors can act as biomarkers for various diseases and food spoilage. The development of small and reliable devices with high sensitivity for detection of these molecules is in demand. Metal-oxide gas sensors present an ideal solution, offering a tradeoff between performance and cost compared to other methods. However, selective detection of low levels of ammonia and multiple gases with one sensor remains a challenge.
Article
Chemistry, Analytical
Mohammad Sadeghi, Mohammad M. Bazrafkan, Marcus Rutner, Franz Faupel
Summary: This study investigates the dynamic behavior of a magnetoelectric microresonator using a finite element method and machine learning algorithm. The linear and nonlinear behavior of the microactuator is evaluated, and differential equations are reconstructed using a data-driven system identification procedure and simulated annealing method. Sensitivity analysis is conducted to determine the optimal range and step size for input parameters. The study finds that prediction error increases as excitation levels increase.
Article
Engineering, Electrical & Electronic
Nanda Perdana, Jonas Drewes, Felix Pohl, Alexander Vahl, Thomas Strunskus, Mady Elbahri, Carsten Rockstuhl, Franz Faupel
Summary: In this work, a plasmonic multilayer nanocomposite thin-film system that efficiently absorbs solar radiation across an extended spectral range was simulated and experimentally tested. The findings suggest that the optimal design of the device can absorb up to 90% light energy from 200 nm to 1800 nm.
MICRO AND NANO ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Niko Carstens, Blessing Adejube, Thomas Strunskus, Franz Faupel, Simon Brown, Alexander Vahl
Summary: Random networks of nanoparticle-based memristive switches have important applications in neuromorphic hardware and can emulate complex connections and behaviors found in biological neural networks. This study shows that critical dynamics and long-range temporal correlation can still be preserved even when the nature of memristive gaps in the network is changed by filling them with an insulating matrix.
NANOSCALE ADVANCES
(2022)