On phenomena in ionized gases
Download 9.74 Mb. Pdf ko'rish
|
- Bu sahifa navigatsiya:
- Ionic composition of the spatial afterglow of an atmospheric pressure He/CO 2 plasma jet by mass spectrometry
- 3. References
- Synthesis and Characterization of Photocatalytic Titanium Oxide Thin Film Deposited on Glass by Atmospheric Pressure Plasma CVD
- 1. Introduction
- Figure1.
3. Results The analysis of colloidal nanoparticles exhibits a narrow size distribution which is suitable for antibacterial applications. Moreover, the preliminary results of roughness and contact angle demonstrate appropriate change for nanoparticle impregnation on multiple polymers. Tests done on polymers impregnated with nanoparticles emphasize third method as the best impregnated sample.
4. Conclusion The presented research shows that chosen methods are a good alternative for the preparation of antibacterial coatings on polymers. Roughness measurements displays interesting results, where a sample made with second method has roughness 20 times higher than untreated polymer, and two times higher than polymer treated only with plasma. Meanwhile, SEM analysis highlights the third method as the best choice for a quick new route to antibacterial coatings. 386
XXXIII ICPIG, July 9-14, 2017, Estoril/Lisbon, Portugal
Ionic composition of the spatial afterglow of an atmospheric pressure He/CO 2 plasma jet by mass spectrometry
A. Hecimovic 1,2 , E. Carbone P 1
, G. Willems P 2 P , K. Sgonina 2 , J. Benedikt P 2 P,,
P 1 P
P
P
In this contribution, we report on the first measurements of the dominant positive ions in the effluent of a helium atmospheric pressure plasma jet (APPJ) discharge with CO 2 addition. The plasma is ignited in a He-CO 2 gas mixture with CO 2 flows from 0.1 – 0.5 %. The measurement of the positive ions in the effluent of the jet, at distances from 1 mm to 5 mm is performed using an energy resolved mass spectrometer with 2 pumping stages. It is found that at 1 mm distance the dominant ions in the effluent are O
ions, and the C x O
+ related observed ions are CO 2 +
2 O 2 + , (CO 2 )O 2 + and (CO
2 ) 2 + ions. The key finding is that the most abundant ions are C 2 O 2 + , (CO 2 )O 2 + . Due to presence of residual water in the system, many clustered ions have been observed as well, such as (H 2 O) 2 H + , (H 2 O)O 2 + , (CO 2 )(H
2 O)H
+ and (CO
2 ) 2 (H 2 O)O + .
1. Introduction CO 2 plasma gas conversion carries the promise of both energy storage and the reduction of a greenhouse gas emission produced by industrial processes and power plants. Both for the accurate description of the plasma dynamics via modelling or through plasma diagnostics, it is necessary to have an accurate description of electron kinetics. In that respect, it is necessary to know the ionic composition which will govern recombination rates. In this contribution, we investigate the positive ions composition in the effluent of an APPJ jet [1] in He+CO
2 gas mixture using energy resolved ion mass spectrometry. The μ-APPJ comprises two RF powered (13.56 MHz) metallic electrodes separated by a 1 mm wide gap. The plasma is ignited between the electrodes in a gas mixture of interest. Mass spectrometry of atmospheric pressure plasmas has been used for sampling of stable neutral and ion species by using differentially pumped multiple stages [2]. Mass spectrometry has the advantage of measuring the absolute densities of neutral species, but with limitation on measuring them only in the plasma effluent. Using a molecular beam mass spectrometer for neutral species, the neutral species composition of the APPJ in He+CO 2
obtained. 2. Results The measurement of positive ions in the effluent of the jet, at distances from 1 mm to 5 mm is performed using an energy resolved ion mass spectrometer. The ion signal intensities is optimized for each ion mass and correlated to the area of the energy resolved ionic distribution function.
Figure 1. Mass spectrum with 0.1% CO 2 /He gas
flow ratio and measured at 1 mm from the outlet.
The first observation is that Helium ions are not observed. This is due to their efficient charge transfer reactions will all molecular species present in the discharge and its effluent. It is found that at 1 mm distance the dominant ions in the effluent are O 2
ions, and the C x O y + ions. Due to presence residual water in the system, many water based ion clusters have been observed additionally. Increasing the distance and increasing the CO 2 flow result in the reduction of the C x O y + ions (probably due to a decrease of the electron density) and dominance of C x H y O z + related ion clusters. 3. References [1] von der Gathen V S, Schaper L, Knake N, Reuter S, Niemi K, Gans T and Winter J 2008
[2] Benedikt J, Hecimovic A, Ellerweg D and von Keudell A 2012 Journal of Physics D: Applied
Topic 10 387
XXXIII ICPIG, July 9-14, 2017, Estoril/Lisbon, Portugal
Synthesis and Characterization of Photocatalytic Titanium Oxide Thin Film Deposited on Glass by Atmospheric Pressure Plasma CVD
Seongchan Kang 1 , Rodolphe Mauchauffé 1 , Se Youn Moon 1,2*
Plasma Experiment and Device Application Lab, Department of Applied Plasma Engineering, Chonbuk National University, 2 Department of Quantum System Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeollabuk-do, 561-756, Republic of Korea *Corresponding author email: symoon@jbnu.ac.kr Herein, we report on the deposition and characterization of titanium oxide thin films deposited by atmospheric pressure plasma CVD and on the study of their photocatalytic properties. This access permits deposition at lower temperatures and easy than normally used in atmospheric pressure based processing. The surface morphology is evidenced by SEM. The transmittance of thin film as well as the material band gap are determined by UV/Vis spectroscopy. The chemical composition is obtained by X-ray Photoelectron Spectroscopy and the crystallinity is assessed by X-ray Diffraction and Raman spectroscopy. Methylene blue degradation in water is performed and monitored by UV/Vis measurement in order to assess the photocatalytic properties of the deposited material.
Titanium dioxide, TiO 2 , has received much attention during the last years due to its photocatalytic properties. Indeed, various applications can be obtained by deposition of TiO 2 thin films such as self-cleaning surfaces and pollutant degradation. Atmospheric pressure plasma deposition appears to be a versatile environmentally friendly process for low-cost and high rate deposition of photoactive mental oxide thin films [1,2] The majority of works in this area has been conducted using vacuum systems, which leads to many limitations, e.g. high running costs, compared to atmospheric pressure processes. In this work, deposition was performed at atmospheric pressure, facilitating in-line process implementation. 2.Experimental Part
3. Conclusion In conclusion, the atmospheric pressure approach reported here appears to be a promising method for the deposition of titanium oxide thin films for photocatalytic applications.
[1] H Fakhouri, ‘Highly efficient photocatalytic TiO2 coatings deposited by open air atmospheric pressure plasma jet with aerosolized TTIP precursor’, J. Phys. D: Appl. Phys., 47, 265301, 2014 [2] Q Chen, ‘Deposition of photocatalytic anatase titanium dioxide films by atmospheric dielectric barrier discharge’, Surf. Coat. Tech., 310, 173–179, 2017 14
388 XXXIII ICPIG, July 9-14, 2017, Estoril/Lisbon, Portugal A study on the characteristics of hollow cathode discharge for the development of VUV lamp
Deoggyun Cho 1 , Duksun Han 1 and Se Youn Moon 1,2,*
1 Department of Applied Plasma Engineering, Chonbuk National University, Korea 2 Department of Quantum System Engineering, Chonbuk National University, Korea
The VUV light source can provide a variable for measuring the density of oxygen based on the theory of the absorption spectroscopy. The VUV light source consists of hollow cathode biased by negative voltage and grounded plate to generate high density plasma. Characteristic of hollow cathode is one of the important variables of the VUV light source, which affects the performance of light sources according to the characteristic of the gas-discharge light source. The characteristics of plasma discharge were determined by checking the composition of the molecules and the composition of the particles according to the electrical characteristics and the wavelength of the cases by using optical emission spectroscopy, and the plasma temperature was measured accordingly. In particular, it was confirmed that the possibility of controlling the plasma VUV light in the 130 nm wavelength region was verified, and the possibility of using the plasma discharge as a VUV lamp was verified.
Ultraviolet(UV) is an electromagnetic radiation with a wavelength from 10nm to 400nm, shorter than that of visible light but longer than X-rays. Long-wavelength ultraviolet radiation can cause chemical reaction and causes many substances to glow or fluoresce. Ionized gas is macroscopically neutral that contains ions, electron, neutral, photon and radicals. The parameters of UV absorption spectroscopy are supported to etch rate, offering potential for
control and
optimization of
semiconductor processing. A hollow cathode lamp is type of lamp used in physics and chemistry as spectral line source and as a frequency tuner for light sources such as lasers. Atomic absorption lines are very narrow. For the Beer-Lambert law to be applicable, the bandwidth of the source should be narrow in comparison with the width of the absorption peak. Otherwise, the signal-to-noise ratio and the slope of the calibration curve would be low; the resulting sensitivity would be poor.
A schematic diagram of UV absorption spectroscopy is presented. It is consists of VUV monochromator, plasma chamber and hollow cathode. The type of the plasma is ICP and the frequency is 13.56MHz. The helium and oxygen gas flow rate is controlled by independent mass flow controller. The monochromator is connected to the ICP chamber with hollow cathode to obtain VUV emission lines.
Schematic diagram of VUV lamp
We conclude that above currents of mA breaks down and discharge begin to develop from the appearance of the discharges in the hollow cathode and measured current-voltage characteristics. The range of the pressure is showed from 10Torr to 100Torr. The kinds of gas are helium and O2. Spectral measurements have been performed using a 250-900nm Princeton Instruments SCT 320. The difference of the glow mode and hollow mode is the intensity of the wavelength. The 546nm(wavelength) is higher, when the mode is change by hollow mode. The 546nm(wavelength) is helium line. And the wavelength is shifted by gas mixture (helium lonely & helium and O2). In fact we can analyze the condition of plasma by analyzing wavelength. We use boltzmann plot theory for the theoretical verification wavelength. The excitation temperature is very important parameter to analyze the state of plasma. We use NIST atomic spectra database for deduct the excitation temperature in kelvin. The excitation temperature of hollow mode is higher than the excitation temperature of glow mode.
16 389 390 Proc. of the XXXIII International Conference on Phenomena in Ionized Gases, Estoril, Portugal, July 9-14, 2017 Author Index A Abahazem, Alyen . . . . . . . . . . . 313 Abdirakhmanov, Assan . . . . . . 213 Abramov, A . . . . . . . . . . . . . . . . 382 Abrashev, Miroslav . . . . . 193 ,
Adamovich, Igor . . . . . . . . . . . . . 27 Afifi, Hassan. . . . . . . . . . . . . . . . 329 Agnihotri, Ashutosh . . . . . . . . . 204 Agrosì, Giovanna . . . . . . . . . . . 255 Akamine, Shuichi . . . . . . 142 ,
Akamine, Syuichi . . . . . . . . . . . 168
Akashi, Haruaki . . . . . . . . 192
, 215
Akildinova, Ainur . . . . . . . . . . . 217
Akishev, Yuri Semenovich . . . 183
Akopdzhanov, Artur . . . . . . . . . 196
Aleiferis, Spyros . . . . . . . . . . . . . 63 Alekseev, Nikolay Vasilievich 374 Alelyani, Layla . . . . . . . . . . . . . 296 Alemán, Belén . . . . . . . . . . . . . . 152 Alexandrov, Andrey . . . . . . . . . 371 Allen, John . . . . . . . . . . . . . . . . . 343 Almeida, Amélia . . . . . . . . . . . . 307 Almeida, Nelson . . . . . . . . . . . . 281 Almeida, Pedro . . . . 287 ,
, 325
Álvarez, Rafael . . . . . . . . . . . . . . 82 Alves, Luís L. . . . . . 205 , 243 , 274
Amirov, Ravil. . . . . . . . . . . . . . . 171
Amrenov, Askhat . . . . . . . . . . . 100
Anastassiou, Charalambos . . . 308
Andreev, Sergey . . . . . . . . . . . . 338
Andrey, Choukourov . . . . . . . . . 75 Anghel, Sorin Dan . . . . . . . . . . 175 Angot, Julien . . . . . . . . . . . . . . . . 63 Annaloro, Julien . . . . . . . . . . . . 264 Aoqui, Shin-Ichi. . . . . . . . 212 ,
Arai, Kotaro . . . . . . . . . . . . . . . . 141
Artemyev, Konstantin. . . . . . . . 196
Artico, Riccardo . . . . . . . . . . . . 368
Arumugam, Saravanakumar . . 229
Astafiev, Alexander . . . . . . . . . . . 85 Atanasova, Mariana . . . . . . . . . . 87 Athanasopoulos, Dimitrios . . 206 ,
Aubert, Xavier . . . . . . . . . . . . . . 291
Aubry, Olivier . . . . . . . . . . . 25 , 228 Awasthi, L M . . . . . . . . . . . . . . . 134 Ayllon, Rolando . . . . . . . . . . . . 312 Azuma, Shiori . . . . . . . . . . . . . . 146 B
328 , 377 Babaeva, Natalia . . . . 15 , 197 , 198 Babinov, Nikita A. . . . . . . . . . . 369
Bae, Hansin . . . . . . . . . . . . . . . . . 57 Baeva, Margarita . . . . . . . 149 , 244 Bagheri, Behnaz . . . . . . . . . . . . 306
Baitha, Anuj Ram . . . . . . . . . . . 177
Ballesteros, Jerónimo . . . . . . . . 247
Baloul, Yasmine . . . . . . . . . . . . 228
Bandelow, Gunnar . . . . . . . . . . 121
Barakat, Christelle . . . . . . . . . . . . . 7 Barengolts, Sergey A. . . . . . . . 156 Barnat, Ed . . . . . . . . . . . . . . 62 ,
Barnwal, Prashant Kumar . . . . 252
Baroch, Pavel . . . . . . . . . . . . . . . . 28 Barriga-Carrasco, Manuel D. . 315 Barton, Richard . . . . . . . . . . . . . . 86 Bastykova, Nuriya. . . . . . . . . . . 227 Basurto, Eduardo. . . . . . . . . . . . 341 Batkin, Vladimir . . . . . . . . . . . . 105 Bauchire, Jean-Marc . . . . 232 ,
Baudrillart, Benoit. . . . . . . . . . . . 69 Bauville, Gérard . . . . . . . . 195 , 291 Béchu, Stéphane . . . . . . . . . 63 , 314 Becker, Markus . . . . . . . . . . . . . 144 Beckers, Frank . . . . . . . . . . . . . . . 17 Benard, Nicolas . . . . . . . . . . . . . . 77 Bénédic, Fabien . . . . . . . . . . . . . . 69 Benedikt, Jan . . . . . . . . . . . . . . . 387 Benhenni, Malika . . . . . . . . . . . 190 Benilov, Mikhail S. 131 ,
, 200
, 232
, 281
, 287
, 322
, 325
Benilova, Larissa. . . . . . . . . . . . 200
Benkhaldoun, Z. . . . . . . . . . . . . . 34 Benmamas, Loucif . . . . . . . . . . 309 Benova, Evgenia . . . . . . . . . . . . . 87 Benredjem, D. . . . . . . . . . . . . . . . 34 Bérard, Rémi . . . . . . . . . . . . . . . 344 Berndt, Johannes . . . . . . . . . . . . . 84 Bernshtam, Vladimir . . . . . . . . 135 Berthelot, Antonin . . . . . . . 56 , 114 Bès, Alexandre . . . . . . . . . . 63 , 314 Bharathi, P. . . . . . . . . . . . . . . . . . 365 Bhattacharjee, Sudeep . . 177 , 178 , 319
Biederman, Hynek . . 75 , 225 , 279 , 310
Bieniek, Matthew . . . . . . . . . . . 287
Biggins, Flora. . . . . . . . . . . . . . . . 63 Bílek, Petr . . . . . . . . . . . . . . . . . . . 81 Bityurin, Valentin . . . . . . . . . . . 332 Bluethner, Ralf. . . . . . . . . . . . . . 290 Boata, Remus . . . . . . . . . . . 34 ,
Bocharov, Aleksey . . . . . . . . . . 332
Boeuf, Jean Pierre . . . . . . . . . . . 173
Bogachev, Nikolay. . . . . . 196
, 338
Bogaczyk, Marc . . . . . . . . 229
, 300
Bogaerts, Annemie . . 56 , 103 , 114 Bogdanov, Todor . . . . . . . . . . . . . 87 Bokhan, Petr. . . . . . . . . . . . . . . . 371 Bonaventura, Zdenˇek . . . 5 ,
, 81 Bonny, Laurent . . . . . . . . . . . . . . 63 Boo, Jin-Hyo . . . . . . . . . . . . . . . Download 9.74 Mb. Do'stlaringiz bilan baham: |
ma'muriyatiga murojaat qiling