Article
Physics, Applied
Li Wu, Xianyu Zhang, Tao Liu, Wencong Zhang, Junwu Tao, Fei Cheng
Summary: This Letter presents an atmospheric pressure low power microwave-induced air plasma source operating at 2.45 GHz. The device can self-ignite air and generate plasma with only 50 W microwave input power, without any additional trigger. Its sustaining power is as low as 10 W, and the gas temperature of plasma tail flame is about 32 degrees C measured by a fiber optic thermometer. Spectroscopic measurements revealed the presence of strong OH(A(2)S(+)? X-2?) bands at 306-310 nm and oxygen atomic lines O-I (3p5P? 3s5S) at 777.1 nm and O-I (3p3P?3s3S) at 844.6 nm. Furthermore, NO- ?(A(2)S(+)?X-2?(r)) from 200 to 300 nm was also detected in the air plasma jet. This portable plasma apparatus shows potential for air plasma applications in the biomedical fields.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Fluids & Plasmas
Sile Chen, Xinliu Ren, Zhaoquan Chen, Xiaojuan Xu, Tao Cheng, Ping LI, Guanjun Zhang, Xinpei Lu
Summary: This work aims to develop an atmospheric fluorocarbon plasma jet for surface modification of insulating materials. By using a coaxial transmission line resonator and microwave discharge with locally enhanced electric field, the gas temperature is reduced and the electron density is increased. The Ar/CF4 plasma jet is found to have the best performance, with strong discharge intensity and controllable gas temperature. It is considered as a promising source for surface fluorination of polymers.
PLASMA SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jacob Manzi, Ariel E. E. Weltner, Tony Varghese, Nicholas McKibben, Mia Busuladzic-Begic, David Estrada, Harish Subbaraman
Summary: This paper demonstrates the use of plasma-jet printing (PJP) to deposit thermoelectric nanoflakes onto flexible substrates at room temperature, with substantial improvements in material adhesion and flexibility observed. The printed films exhibit electrical conductivity of 2.5 x 10(3) S m(-1) and a power factor of 70 mu W m(-1) K-2 at room temperature. This advancement in plasma jet printing promotes not only the development of energy harvesting but also large-scale flexible electronics and sensors for space and commercial applications.
Article
Chemistry, Physical
Aswathy Vasudevan, Vasyl Shvalya, Martin Kosicek, Janez Zavasnik, Andrea Jurov, Neelakandan M. Santhosh, Aleksander Zidansek, Uros Cvelbar
Summary: Cold-atmospheric plasma-assisted deposition is an efficient technique for synthesizing gold nanoparticles, and the presence of ethanol promotes the reduction of gold to nanostructures. Nanostructured thin films can be created within a short time by controlling plasma parameters. The deposited gold nanoparticles exhibit advanced plasmonic surface-enhanced Raman scattering responses, making them potential substrates for fast and reliable optical analytical bio-chemical sensing.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Computer Science, Information Systems
Chaoyang Zhang, Wenjie Fu, Shijie Hu, Tongxing Huang, Yang Yan
Summary: The study compared continuous and modulated microwave plasma filaments generated by a hand-held microwave plasma jet in terms of plasma length, electron excitation temperature, and emission spectrum. It was found that modulated microwave could produce stable plasma filaments directly in the air without protective tubes, differing from continuous microwave plasma in all parameters. Additionally, stable tearing of plasma filaments was observed during the experiments.
Article
Materials Science, Multidisciplinary
Qizhen Wang, Zhihui Liu, Xin Zhang, Yi Zhang, Tianlong Jiang, Weiming Zhang, Hualin Wang, Weiwei Jiang, Shimin Liu, Chaoqian Liu, Nan Wang, Yunxian Cui, Wanyu Ding, Chuang Dong
Summary: SiO2 insulation film was prepared using atmospheric pressure plasma jet (APPJ) technology, allowing for application on large-sized and/or complex surface morphology substrates. The relative content of Si and O in APPJ affected the insulation resistance of SiO2 film, with excessive Si leading to improved resistance.
Article
Physics, Fluids & Plasmas
Jingkai Jiang, Peter J. Bruggeman
Summary: This study utilized molecular beam mass spectrometry to characterize ion fluxes generated by a modulated radiofrequency-driven atmospheric pressure plasma jet in a homogeneous gas environment. The research investigated the influence of RF modulation frequency on ion fluxes and found significant differences in dynamics between positive and negative ions, highlighting the tremendous impact of memory effects on plasma propagation and pre-ionization.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Physics, Applied
Chaoxia Zhao, Xinxin Li, Dinesh K. K. Agrawal, Zhili Yan, Siyao Qi, Yao Liu, Tianbao Ma, Qian Chen, Yi Zhang, Ce Wang, Kama Huang
Summary: A microwave atmospheric pressure plasma jet (MW-APPJ) generator based on a substrate-integrated waveguide (SIW) resonator is proposed, which can achieve a thin, straight plasma needle with a length of 9 cm. It has a high microwave feeding efficiency of over 90% under a wide range of gas flow rates without the need for a microwave matching network. The plasma jet's morphology transitions from laminar to turbulent mode as the gas flow increases from 1 to 14 L/min. Additionally, the SIW-based plasma generator can effectively make the polyimide film super hydrophilic after a 5-min treatment.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Engineering, Electrical & Electronic
Wei Xiao, Yinhong Liao, Kama Huang
Summary: The microwave perturbation method (MPM) has been extended to measure the electron density of the atmospheric microwave plasma jet (AMPJ) by proposing a microwave parallel resonant cavity (MPRC) and a Gaussian electron density distribution model. By compressing the MPRC to enhance sensitivity and calculating the resonant frequency shifts based on the Gaussian model, the electron density of the 2.45-GHz AMPJ was successfully measured with a relative error below 3% compared to optical measurements, showing great potential for engineering applications due to its cost-effectiveness and convenience.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Physics, Applied
J. Liu, L. Nie, Y. Xian, X. Lu
Summary: The study found that adding a small amount of nitrogen or oxygen to argon can make the plasma channel smooth, while the rotational frequency of the electrode does not affect the appearance of the plasma channel. Optical emission spectra show that adding O-2/N-2 reduces the emission intensity of transitions from excited argon levels to metastable states, leading to a transition of the discharge channel's nature.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Jia-Shiuan Tsai, Jian-Zhang Chen
Summary: This study investigated the impact of oxygen impurity on the inlet gas in a nitrogen atmospheric pressure plasma jet (APPJ). A numerical model was developed to simulate the nitrogen APPJ considering fluid dynamics, heat transfer, mass transfer, diffusion, and chemical reactions. Experimental tests were conducted to verify the plasma temperature characteristics on the treated surface. The findings revealed that the plasma temperature decreased with increasing oxygen impurity, affecting the excited and neutral species composition.
APPLIED SCIENCES-BASEL
(2023)
Article
Physics, Applied
Shou-Zhe Li, Shi-Hui Xie, Yu-Long Niu, Zilu Zhao, Dezheng Yang, Jialiang Zhang, Wenchun Wang, Xuechen Li
Summary: In this study, H2S is decomposed using a N-2 microwave plasma torch, resulting in the production of hydrogen and elemental sulfur. The conversion rate of H2S into H-2 is investigated by varying the dilution ratios of H2S to N-2, MW power, total flow rate, and arrangement of cooling rods in the reaction chamber. It is found that introducing a cooling rod downstream in the reaction chamber enhances the conversion rate, and an optimum point is determined for each conversion curve based on MW power, gas flow rate, and relative distance of the cooling rod.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Yi Liu, Li Lin, Michael Keidar
Summary: This research discovers that electromagnetic emissions from cold atmospheric plasmas can cause cell membrane oscillations and increase sensitivity to the chemical active ingredients used in treatments. The study calculates the spatial distribution of electromagnetic emission power density spectrum from a cold atmospheric helium plasma jet, and identifies plasma oscillations as the main source of electromagnetic radiation.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
K. Gazeli, M. Hadjicharalambous, Eleftherios Ioannou, O. Gazeli, C. Lazarou, C. Anastassiou, P. Svarnas, V. Vavourakis, G. E. Georghiou
Summary: We developed an in silico model to simulate the response of B16F10 melanoma cells to a helium atmospheric pressure plasma jet (APPJ) and doxorubicin drug (DOX). The simulation results showed that increasing plasma duration and DOX concentration resulted in increased cytotoxicity and a higher apoptosis probability compared to mitosis probability. Furthermore, combining plasma treatment and drug application enhanced cell cytotoxicity. This in silico model is valuable in the field of plasma medicine for understanding the response of different cancers to APPJ and cancer drugs.
APPLIED PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Nazli Turan, Mortaza Saeidi-Javash, Jiahao Chen, Minxiang Zeng, Yanliang Zhang, David B. Go
Summary: The passage discusses the application of atmospheric pressure nonthermal plasmas in sintering printed films, demonstrating the surface modifications achieved through nonthermal plasmas under ambient conditions. These results offer a new direction for future electronic device manufacturing, showcasing the potential of utilizing nonthermal plasmas for additive manufacturing on flexible and low-melting-point materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Biochemistry & Molecular Biology
Anton M. Manakhov, Elizaveta S. Permyakova, Natalya A. Sitnikova, Alphiya R. Tsygankova, Alexander Y. Alekseev, Maria V. Solomatina, Victor S. Baidyshev, Zakhar I. Popov, Lucie Blahova, Marek Elias, Lenka Zajickova, Andrey M. Kovalskii, Alexander N. Sheveyko, Philipp V. Kiryukhantsev-Korneev, Dmitry V. Shtansky, David Necas, Anastasiya O. Solovieva
Summary: The COVID-19 pandemic has highlighted the importance of efficient, low-cost materials for protecting people from viruses. This study investigates the use of nanofibers for air filtration and discovers that nanofibers coated with copper exhibit high antiviral activity. This finding is significant for the development of low-cost self-sanitizing surfaces and face masks, and it has implications for air filtration applications.
Article
Chemistry, Multidisciplinary
I Jennifer Gomez, Manuel Vazquez Sulleiro, Anna Doleckova, Nadezda Pizurova, Jirina Medalova, Antonin Bednarik, Jan Preisler, David Necas, Lenka Zajickova
Summary: GQDs synthesized using a fast microwave-assisted hydrothermal protocol exhibited emission from NUV-Vis to NIR range, with their structure and chemical composition elucidated using advanced NMR and spectroscopy techniques. The observed multicolor red-shifted fluorescence emission in cell imaging demonstrates the potential application of GQDs as bioimaging carriers, along with their non-cytotoxicity confirmed through ATP assay.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Nanoscience & Nanotechnology
Rajarshi Roy, David Holec, Markus Kratzer, Philipp Muenzer, Preeti Kaushik, Lukas Michal, Gundam Sandeep Kumar, Lenka Zajickova, Christian Teichert
Summary: In recent years, graphene-based van der Waals (vdW) heterostructures have shown interesting charge transfer dynamics, which are significant for optoelectronic applications. In this study, a novel graphene-based 0D-2D vdW heterostructure between graphene and amine-functionalized graphene quantum dots (GQD) was investigated to study interfacial charge transfer and doping possibilities. The results revealed p-type doping in graphene induced by functional GQDs, as confirmed by ab initio simulations and Kelvin probe force microscopy (KPFM) measurements. Power-dependent Raman spectroscopy also showed a doping-induced gating effect in both graphene and the heterostructure, suggesting a breakdown of the adiabatic Born-Oppenheimer approximation and an asymmetry in conduction and carrier mobility.
Article
Chemistry, Multidisciplinary
Jose Munoz, Mario Palacios-Corella, I. Jennifer Gomez, Lenka Zajickova, Martin Pumera
Summary: In this study, a first prototype of organic-inorganic 2D-Ge heterostructure has been synthesized, and by introducing thiol-rich carbon dots, new physicochemical features have been provided, enabling its application in optoelectronic tasks.
ADVANCED MATERIALS
(2022)
Article
Physics, Applied
Maren Dworschak, Niklas Kohlmann, Filip Matejka, Pavel Galar, Lorenz Kienle, Jan Schaefer, Jan Benedikt
Summary: The HelixJet plasma source was utilized to synthesize silicon nanoparticles (Si-NPs) operating under atmospheric pressure. By adjusting the operational parameters, Si-NPs with different sizes, crystallinity, structure, and photoluminescence properties were achieved. The addition of H-2 and high RF powers led to the formation of crystalline nanoparticles with strong photoluminescence intensity, which could be tuned by controlling the synthesis parameters. Post-synthesis annealing allowed for the synthesis of large crystalline nanoparticles. The study also involved design improvements for the HelixJet plasma source, enhancing its stability and enabling continuous long-term operation.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Chemistry, Physical
I. Jennifer Gomez, Manuel Vazquez Sulleiro, Nadezda Pizurova, Antonin Bednarik, Petr Lepcio, David Holec, Jan Preisler, Lenka Zajickova
Summary: Carbon dots (CDs) exhibit similar photophysical features despite different synthesis protocols. Understanding the structure is crucial for achieving desired properties. This study provides insight into the structure and formation of CDs, identifying the presence of molecular fluorophore species. Density functional theory calculations support the spontaneous formation of a compact network of molecular species. Additionally, the study comprehensively investigates the photoluminescence properties, paving the way for CD-based logic gate fluorescent sensors.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Environmental
Rezvan Hosseini Rad, Volker Brueser, Milko Schiorlin, Jan Schaefer, Ronny Brandenburg
Summary: CO2 splitting in a dielectric barrier discharge (DBD) is investigated using both empty and packed bed reactors with and without cerium oxide catalyst. The DBDs are operated at pressures up to 2 bar, with the addition of argon to reduce breakdown voltage. The electrical characteristics of the discharge are studied, along with the CO2 dissociation. Increasing pressure requires a higher minimum sustaining voltage amplitude, but the optimum power input depends on pressure and gas composition. Adding ceria-coated glass spheres improves reactor performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Physics, Applied
Martina Buchtelova, Lucie Blahova, David Necas, Petra Krizkova, Jana Bartosikova, Jirina Medalova, Zdenka Kolska, Dirk Hegemann, Lenka Zajickova
Summary: Plasma polymers can enhance the bio-applicability of material surfaces, but the mechanism of cell adhesion to different functional groups in these polymers is still not fully understood.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Physics, Fluids & Plasmas
J. Hnilica, P. Klein, P. Vasina, R. Snyders, N. Britun
Summary: The behavior of ground state neutral and singly ionized atoms in multipulse high power impulse magnetron sputtering processes was investigated using time-resolved two-dimensional laser-induced fluorescence. The density mapping of the discharge volume during plasma-on and plasma-off time phases was examined. The study systematically analyzed and discussed the role of the number of micropulses and delay time between micropulses in the pulse package, as well as the propagation of sputtered particles from the target.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Polymer Science
Lucie Janu, Eva Dvorakova, Katerina Polaskova, Martina Buchtelova, Petr Rysanek, Zdenek Chlup, Tomas Kruml, Oleksandr Galmiz, David Necas, Lenka Zajickova
Summary: Excellent adhesion between electrospun nanofiber and textile support is crucial in various bioapplications, such as wound dressing development. Different plasma modifications were compared for their effect on adhesion, with low-pressure oxygen treatment showing the strongest improvement. The synergy of treatment homogeneity, surface functional groups, and wettability contributed to the enhanced adhesion.
Article
Chemistry, Multidisciplinary
I. Jennifer Gomez, Karina Ovejero-Paredes, Jose Manuel Mendez-Arriaga, Nadezda Pizurova, Marco Filice, Lenka Zajickova, Sanjiv Prashar, Santiago Gomez-Ruiz
Summary: Due to their water solubility, stability, non-toxicity, and photoluminescence, nitrogen-doped graphene quantum dots (NGQDs) have potential for delivering organotin(IV) compounds in cancer therapy. Two nanosystems were developed by grafting organotin fragments and 4-formylbenzoic acid onto the surface of NGQDs. In vitro tests demonstrated high cytotoxicity against breast cancer cells (MDA-MB-231) and minimal effects on non-cancer cells (HEK293T), with successful uptake and release of the metallodrug in cancer cells.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
I. Jennifer Gomez, Miguel Diaz-Sanchez, Nadezda Pizurova, Lenka Zajickova, Sanjiv Prashar, Santiago Gomez-Ruiz
Summary: This work reports a facile synthesis method of hybrids of F-doped TiO2 and N-doped graphene quantum dots (F-TiO2@N-GQDs), which show efficient photocatalytic properties in light-driven pollutant reduction.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Materials Science, Coatings & Films
Anjar Anggraini Harumningtyas, Tomoko Ito, Michiro Isobe, Lenka Zajickova, Satoshi Hamaguchi
Summary: Molecular dynamics simulations were used to study the formation of amine in carbon-based polymer films deposited by plasma enhanced chemical vapor deposition (PECVD). The study found that even under ideal conditions, the content of primary amine is relatively small.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Physics, Applied
Katerina Polaskova, Alp Ozkan, Milos Klima, Zdenka Jenikova, Madhuwanthi Buddhadasa, Francois Reniers, Lenka Zajickova
Summary: Plasma treatment is a widely-used method to improve the surface properties of polypropylene (PP), but the efficiency of different plasma discharges is rarely compared. In this study, the differences in PP treated by three arc-based commercial plasma jets (PT-RPJ, AFS-PJ, ST-GA) and a low-temperature RF plasma slit jet (RF-PSJ) were discussed. It was found that the AFS-PJ had a different reactive species composition dominated by nitrogen oxides, leading to higher thermal loads and surface damage. On the other hand, PT-RPJ and ST-GA had higher oxygen and nitrogen concentrations on the PP surface, resulting in higher adhesion strength on PP-aluminum joints.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Chemistry, Multidisciplinary
I. Jennifer Gomez, Marina Russo, Orazio Angelo Arcidiacono, Esther M. Sanchez-Carnerero, Petr Klan, Lenka Zajickova
Summary: This study presents a strategy to connect highly efficient but poorly water-soluble BODIPY photosensitizers to the surface of nitrogen-doped graphene quantum dots (NGQDs) through controlled covalent functionalization. The NGQD-BODIPY PSs do not aggregate in aqueous solutions and generate reactive oxygen species (ROS), with high singlet-oxygen production quantum yields. In vitro experiments confirm that the PSs mainly accumulate in the cytoplasmic region of human cervical cancer cells, leading to a significant reduction in cell viability upon irradiation.
MATERIALS CHEMISTRY FRONTIERS
(2022)
