Artykuły w czasopismach: „Carbon Nano-structured Thin Films”

1

Srivastava, Sanjay K., A. K. Shukla, V. D. Vankar i V. Kumar. "Growth, structure and field emission characteristics of petal like carbon nano-structured thin films". Thin Solid Films 492, nr 1-2 (grudzień 2005): 124–30. http://dx.doi.org/10.1016/j.tsf.2005.07.283.

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Lin, Jing, Tie Feng Zhang i Gui Wen Yu. "Study on the Preparation and Corrosion Resistance of Nano-Structured SiO₂ Thin Film on Carbon Steel". Advanced Materials Research 183-185 (styczeń 2011): 1722–25. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.1722.

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Used RF magnetron sputtering method to prepare SiO2thin film on the carbon steel (Q235A) substrate, Films were characterized with the atomic force microscope (AFM) and the X-ray photoelectron spectrum (XPS). Corrosion resistance was compared of SiO2/ Q235A and Q235A. The results showed that: nano-structured thin film was smooth and dense, The thin film was constituted by compact particles of SiO2, and there was no Fe in the films. Electrochemical experiments indicated that SiO2/ Q235A had better corrosion resistant than Q235A in the sea water.

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Dwivedi, Neeraj, Sushil Kumar, Ishpal Rawal i Hitendra K. Malik. "Influence of consumed power on structural and nano-mechanical properties of nano-structured diamond-like carbon thin films". Applied Surface Science 300 (maj 2014): 141–48. http://dx.doi.org/10.1016/j.apsusc.2014.02.023.

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Cao, Chuanbao, Jiyu Fu i Hesun Zhu. "CARBON NITRIDE THIN FILMS DEPOSITED BY CATHODIC ELECTRODEPOSITION". International Journal of Modern Physics B 16, nr 06n07 (20.03.2002): 1138–42. http://dx.doi.org/10.1142/s0217979202011007.

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Carbon nitride thin films were prepared by cathodic electrodeposition. The dicyandiamide compound dissovled in acetone was selected as the organic precursor. Single crystal silicon wafers and conductive glass (ITO) wafers were used as substrates. XPS measurements indicated that the films composed of carbon and nitrogen elements. The nitrogen content reached 41%. The polycrystalline β-C3N4 should exit in the prepared film from TED measurements. The nano hardness of the films on ITO substrates were as high as 13 GPa. The structure and properties were studies.

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BELADI, HOSSEIN, ILANA B. TIMOKHINA, PETER D. HODGSON i YOSHITAKA ADACHI. "CHARACTERIZATION OF NANO-STRUCTURED BAINITIC STEEL". International Journal of Modern Physics: Conference Series 05 (styczeń 2012): 1–8. http://dx.doi.org/10.1142/s2010194512001778.

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A 0.79 C -1.5 Si -1.98 Mn -0.98 Cr -0.24 Mo -1.06 Al -1.58 Co ( wt %) steel was isothermally heat treated at 200°C for 10 days to produce a nano-structured bainitic steel. The microstructure consisted of nanobainitic ferrite laths with a high dislocation density and retained austenite films having extensive twins. The crystallographic analysis using TEM and EBSD revealed that the bainitic ferrite laths are close to the Nishiyama-Wassermann orientation relationship with their parent austenite. There was only one type of packet identified in a given transformed austenite grain. Each packet consisted of two different blocks having variants with the same habit plane, but different crystallographic orientations. Atom Probe Tomography (APT) revealed that the carbon content of nanobainitic ferrite laths was much higher than expected from the para-equilibrium level. This was explained due to the long heat treatment time, which led to the formation of fine Fe - C clusters on areas with high dislocation densities in bainitic ferrite laths.

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Karimov, KH S., M. M. Ahmed, Z. M. Karieva, M. Saleem, A. Mateen i S. A. Moiz. "Humidity Sensing Properties of Carbon Nano-Tube Thin Films". Sensor Letters 9, nr 5 (1.10.2011): 1649–53. http://dx.doi.org/10.1166/sl.2011.1727.

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Ahmad, R., M. Salina, M. H. Mamat, A. Awang Teh, M. Kara, M. Rusop i Z. Awang. "Aging Effects on Physical and Electrical Properties of Nano-Structured MgZnO Thin Films for Carbon Nanotube Applications". Journal of Nanoscience and Nanotechnology 12, nr 10 (1.10.2012): 8153–57. http://dx.doi.org/10.1166/jnn.2012.4524.

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Chang, Fuh-Yu, Ruoh-Huey Wang, Hsiharng Yang, Yu-Hsien Lin, Tse-Min Chen i Shu-Jiuan Huang. "Flexible strain sensors fabricated with carbon nano-tube and carbon nano-fiber composite thin films". Thin Solid Films 518, nr 24 (październik 2010): 7343–47. http://dx.doi.org/10.1016/j.tsf.2010.04.108.

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Li, Dong, Yip‐Wah Chung, Ming‐Show Wong i William D. Sproul. "Nano‐indentation studies of ultrahigh strength carbon nitride thin films". Journal of Applied Physics 74, nr 1 (lipiec 1993): 219–23. http://dx.doi.org/10.1063/1.355304.

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Kovalchuk, A. A. "Structure and oxygen-sensitive properties of thin films of natural carbon". Journal of Physics: Conference Series 2316, nr 1 (1.08.2022): 012014. http://dx.doi.org/10.1088/1742-6596/2316/1/012014.

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Abstract Thin film carbon nanomaterials are widely studied and used as functional, conductive, reflective, and sensor coatings. In this work, films of natural graphene-based carbon are studied as a sensitive material for a gas sensor operating close to room temperature. The structural features of the films were studied by scanning electron microscopy and Raman spectroscopy. It has been found that the deposition of natural carbon on substrates with a conductive coatings of indium oxide and of indium tin oxide allows to obtain a thin films, represented by homogeneous carbon nets, in the nodes of which are globular nano-sized particles. Microwave conductivity measurements were carried out using a λ/4 coaxial resonator based on a symmetric two-wire line. The results demonstrated that films on substrates with deposited indium oxide and indium tin oxide desorb oxygen from various structural levels of graphene-based carbon.

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Mamidi, Narsimha, Ramiro Velasco Delgadillo, Aldo Gonzáles Ortiz i Enrique Barrera. "Carbon Nano-Onions Reinforced Multilayered Thin Film System for Stimuli-Responsive Drug Release". Pharmaceutics 12, nr 12 (13.12.2020): 1208. http://dx.doi.org/10.3390/pharmaceutics12121208.

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Herein, poly (N-(4-aminophenyl) methacrylamide))-carbon nano-onions (PAPMA-CNOs = f-CNOs) and anilinated-poly (ether ether ketone) (AN-PEEK) have synthesized, and AN-PEEK/f-CNOs composite thin films were primed via layer-by-layer (LbL) self-assembly for stimuli-responsive drug release. The obtained thin films exhibited pH-responsive drug release in a controlled manner; pH 4.5 = 99.2% and pH 6.5 = 59.3% of doxorubicin (DOX) release was observed over 15 days. Supramolecular π-π stacking interactions between f-CNOs and DOX played a critical role in controlling drug release from thin films. Cell viability was studied with human osteoblast cells and augmented viability was perceived. Moreover, the thin films presented 891.4 ± 8.2 MPa of the tensile strength (σult), 43.2 ± 1.1 GPa of Young’s modulus (E), and 164.5 ± 1.7 Jg−1 of toughness (K). Quantitative scrutiny revealed that the well-ordered aligned nanofibers provide critical interphase, and this could be responsible for augmented tensile properties. Nonetheless, a pH-responsive and mechanically robust biocompatible thin-film system may show potential applications in the biomedical field.

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Kono, Junichiro. "(Invited, Digital Presentation) Optoelectronic Processes in Single-Chirality Carbon Nanotube Thin Films". ECS Meeting Abstracts MA2022-01, nr 9 (7.07.2022): 744. http://dx.doi.org/10.1149/ma2022-019744mtgabs.

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Much understanding exists regarding chirality-dependent properties of single-wall carbon nanotubes (SWCNTs), primarily obtained through single-tube studies. However, macroscopic manifestations of chirality dependence have been limited, especially in electronic transport. Here, recent progress in our optical and electronic transport studies of single-chirality SWCNT thin films will be reviewed. We observed pronounced chirality-dependent electronic localization in temperature and magnetic field dependent conductivity measurements on macroscopic films of single-chirality SWCNTs [1]. We also performed optical absorption measurements in aligned single-chirality (6,5) SWCNT films, and through comparison with detailed theoretical calculations based on the Boltzmann scattering equation, we demonstrated that the background absorption is due to phonon-assisted transitions from the semiconductor vacuum to finite-momentum continuum states of excitons [2]. Furthermore, we conducted terahertz emission and photocurrent studies on films of aligned single-chirality semiconducting SWCNTs and found that excitons autoionize, i.e., spontaneously dissociate into electrons and holes [3]. Some of these studies were enabled by our recent improvement of the controlled vacuum filtration technique [4,5], which allows us to fabricate wafer-scale aligned SWCNTs with extremely anisotropic optical properties [6-9]. W. Gao et al., “Band Structure Dependent Electronic Localization in Macroscopic Films of Single-Chirality Single-Wall Carbon Nanotubes,” Carbon 183, 774 (2021). S. Dal Forno et al., “Origin of the Background Absorption in Carbon Nanotubes: Phonon-Assisted Excitonic Continuum,” Carbon 186, 465 (2021). F. R. G. Bagsican et al., “Terahertz Excitonics in Carbon Nanotubes: Exciton Autoionization and Multiplication,” Nano Letters 20, 3098 (2020). X. He et al., “Wafer-Scale Monodomain Films of Spontaneously Aligned Single-Walled Carbon Nanotubes,” Nature Nanotechnology 11, 633 (2016). W. Gao and J. Kono, “Science and Applications of Wafer-Scale Crystalline Carbon Nanotube Films Prepared through Controlled Vacuum Filtration,” Royal Society Open Science 6, 181605 (2019). F. Katsutani et al., “Direct Observation of Cross-Polarized Excitons in Aligned Single-Chirality Single-Wall Carbon Nanotubes,” Physical Review B 99, 035426 (2019). W. Gao et al., “Macroscopically Aligned Carbon Nanotubes as a Refractory Platform for Hyperbolic Thermal Emitters,” ACS Photonics 6, 1602 (2019). N. Komatsu et al., “Groove-Assisted Global Spontaneous Alignment of Carbon Nanotubes in Vacuum Filtration,” Nano Letters 20, 2332 (2020). A. Baydin et al., “Giant Terahertz Polarization Rotation in Ultrathin Films of Aligned Carbon Nanotubes,” Optica 8, 760 (2021).

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Wilson, G. M., J. F. Smith i J. L. Sullivan. "A DOE nano-tribological study of thin amorphous carbon-based films". Tribology International 42, nr 2 (luty 2009): 220–28. http://dx.doi.org/10.1016/j.triboint.2008.06.006.

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Gu, Guang-Rui, i Toshimichi Ito. "Field emission characteristics of thin-metal-coated nano-sheet carbon films". Applied Surface Science 257, nr 7 (styczeń 2011): 2455–60. http://dx.doi.org/10.1016/j.apsusc.2010.10.002.

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Sharma, Ashok K., Jong-Huy Kim i Yong-Sung Lee. "An Efficient Synthesis of Polypyrrole/carbon Fiber Composite Nano-thin Films". International Journal of Electrochemical Science 4, nr 11 (listopad 2009): 1560–67. http://dx.doi.org/10.1016/s1452-3981(23)15245-x.

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Tan, Chong Wei, Ye Zhu, Shen Lin Chua, Maziar Shakerzadeh, Chuan Seng Tan i Beng Kang Tay. "Electrical properties of FCVA deposited nano-crystalline graphitic carbon thin films with in situ treatment techniques". European Physical Journal Applied Physics 85, nr 2 (luty 2019): 20301. http://dx.doi.org/10.1051/epjap/2019180097.

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In this report, detailed studies of the nano-crystalline graphitic (NCG) carbon thin films deposited by filtered cathodic vacuum arc (FCVA) following its first discovery and first electrical characterization have been performed. The microstructure of carbon thin film can be modified by applying in situ treatment techniques (such as altering the thermal and carbon ion deposition energy). It was found that highly electrical conductive carbon thin films with graphitic planes can also be deposited at a low deposition temperature instead of the previously reported high deposition temperature with a 20% improvement in electrical characteristic. The detailed electrical characterization comparison between amorphous carbon and NCG has been conducted. To conclude, NCG carbon can be fabricated at deposition temperature above 400 °C and exhibits increasing through film Ohmic electrical conductivity with increasing deposition temperature. At low temperatures, NCG carbon can be produced by increasing the negative substrate bias above 300 V (impinging carbon ion energy). Higher negative substrate bias leads to thinner amorphous interface layer hence better electrical conductivity.

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Baschir, L., I. D. Simandan, F. Sava, A. Mihailescu i G. Socol. "Multilayer Langmuir-Blodgett thin films studies for chemical sensors development". Journal of Ovonic Research 17, nr 4 (lipiec 2021): 405–10. http://dx.doi.org/10.15251/jor.2021.174.405.

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This paper presents the study of the development of complex organic materials deposited by the Langmuir Blodgett technique. We have synthetized Langmuir Blodgett multilayers for the recognition of toxic chemicals in the air and / or ultraviolet radiation. The sensitive materials are based on multilayers of stearic acid metal salts combined with nanocarbon and metalloporphyrin structures. We prepared and obtained by the Langmuir Blodgett method films with nano-metric thicknesses combined in different concentrations of metal salts of fatty acids, Nano carbon structures and metalloporphyrins. Further we have characterized and tested the materials obtained for the sensitivity and selectivity of multilayers under the influence of various toxic gases and / or ultraviolet radiation obtaining high results in the field of sensors.

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Najafov, BA, FP Abasov i RS Ibragimov. "Obtaining Thin Films of Silicon-Carbon Method of Reactive Magnetron Sputtering are used as Solar Cells". Journal of Nanosciences Research & Reports 3, nr 2 (30.06.2021): 1–7. http://dx.doi.org/10.47363/jnsrr/2021(3)121.

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In the work of the various parameters studied film amorphous and nano-crystalline alloy silicon-carbon (а-nc-Si1-xCx :H (x=0÷1)) doped with phosphorus (PH3 ) and boron (B2 H6 ). Studied the properties of these films on different substrates derived from quartz, glass and Silicon-coated Fe, Al, Pd, Ni, Ti, Ag. Using transmission electron microscopy (TEM) studied the morphology obtained nano tubes. Also examine the structural properties of films by using infrared spectroscopy and x-ray diffraction of x-rays. Created by cascade solar cells area S = 1.2 cm2 and have a coefficient of 11.2%.

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Xue, Wei, i Tianhong Cui. "A High-Resolution Amperometric Acetylcholine Sensor Based on Nano-Assembled Carbon Nanotube and Acetylcholinesterase Thin Films". Journal of Nano Research 1 (styczeń 2008): 1–9. http://dx.doi.org/10.4028/www.scientific.net/jnanor.1.1.

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We demonstrate a carbon nanotube based high-resolution biosensor for acetylcholine sensing. Carbon nanotubes are deposited on a silicon wafer in a repeated fashion with layer-by-layer nano self-assembly technique. With nano-assembled acetylcholinesterase molecules on the surface, the carbon nanotube biosensor is capable of detecting acetylcholine at an ultra-low concentration of 100 pM. The sensitivity of the acetylcholine sensor is measured as 7.2 µA/decade. The real-time measurement shows the response time of the biosensor is approximately 6 sec. Both the carbon nanotube film and the acetylcholinesterase film are crucial in the sensing process. Due to its high resolution, fast response, small size, and low cost, the carbon nanotube biosensor has tremendous potential for applications in medical research and clinical diagnosis.

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Abd - Alsada, A. S., i M. F. A. Alias. "Impact of CNT Concentrations on Structural, Morphological and Optical Properties of ZnO: CNT Nano composite Films". Journal of Physics: Conference Series 2114, nr 1 (1.12.2021): 012020. http://dx.doi.org/10.1088/1742-6596/2114/1/012020.

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Abstract In this study, zinc oxide: carbon nanotube (ZnO: CNT) nano composite films with varying CNT concentrations (0,3,5,10, and 15) wt percent were generated utilizing the pulsed laser deposition (PLD) procedure on clean glass substrates at room temperature. The impact of CNT concentration on the structural, morphological, and optical features of ZnO: CNT nano thin films as deposited was examined. X-ray diffraction was used to evaluate the structure of the generated ZnO: CNT thin films, while an atomic force microscope was used to explore the morphological features of the nano films (AFM) and field emission scan electron microscopy (FESEM). The optical properties of prepared thin films were characterized and studied using UV-VIS-NIR spectrophotometer. The structures of prepared ZnO: CNT with different concentration of CNT thin films were polycrystalline. ZnO: CNT nano thin films were synthesized in hexagonal phase and the dominate orientation is (101). The crystallite sizes are 32 and 26 nm for (101) and (100)) planes for ZnO and ZnO: 15% CNT nano films respectively. These crystallite size are decreased with increasing CNT (0, 3,5,10 and 15) wt. %. The lowest grain size can be shown for ZnO, while the largest grain size can be seen in ZnO: CNT nano thin with 15% concentration, whereas FESEM micrographs displayed a typically rough, pronounced microstructure, with surface protrusions. The energy gap (Eg) of ZnO: CNT nano thin film with various concentrations is computed. The result analysis shows that Eg decreased with increasing CNT weight concentration. This type of behaviors make the prepared films are good candidate for broad range of applications such as optoelectronic and display devices.

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Li, Dong, Yip-Wah Chung, Ming-Show Wong i William D. Sproul. "Nano-Indentation and Tribological Studies of Ultrahigh Strength Carbon Nitride Thin Films". Tribology Transactions 37, nr 3 (styczeń 1994): 479–82. http://dx.doi.org/10.1080/10402009408983320.

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Guang-Rui, Gu, i Ito Toshimichi. "Enhanced field emission characteristics of thin-Au-coated nano-sheet carbon films". Chinese Physics B 18, nr 10 (29.09.2009): 4547–51. http://dx.doi.org/10.1088/1674-1056/18/10/075.

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Bosworth, David A., Nadia A. Stelmashenko i Zoe H. Barber. "Structural control of carbon nickel nano-composite thin films without substrate heating". Thin Solid Films 540 (lipiec 2013): 10–16. http://dx.doi.org/10.1016/j.tsf.2013.05.112.

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Dayal, Saurabh, Sushil Kumar, Neeraj Dwivedi, Sreekumar Chockalingam, C. M. S. Rauthan i O. S. Panwar. "Structural and nano-mechanical properties of nanostructured diamond-like carbon thin films". Metals and Materials International 19, nr 3 (maj 2013): 405–10. http://dx.doi.org/10.1007/s12540-013-3005-y.

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Li-Jun, Wang, Zhu Yu-Zhuan, Wang Xiao-Ping, Zhang Shi, Liu Xin-Xin, Li Huai-Hui, Mei Cui-Yu i Liu Xiao-Fei. "Field Electron Emission from Caterpillar-Like Clavae Nano-Structure Carbon Thin Films". Chinese Physics Letters 27, nr 8 (sierpień 2010): 087901. http://dx.doi.org/10.1088/0256-307x/27/8/087901.

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Saleemi, Awais Siddique, Muhammad Hafeez, Muhammad Saeed, Ali Abdullah, Muhammad Anis-ur Rehman i Shern-Long Lee. "Substrate Impact on MR Characteristics of Carbon Nano Films Explored via AFM and Raman Analysis". Materials 14, nr 13 (30.06.2021): 3649. http://dx.doi.org/10.3390/ma14133649.

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Recent advances in the fabrication and classification of amorphous carbon (a-Carbon) thin films play an active part in the field of surface materials science. In this paper, a pulsed laser deposition (PLD) technique through controlling experimental parameters, including deposition time/temperature and laser energy/frequency, has been employed to examine the substrate effect of amorphous carbon thin film fabrication over SiO2 and glass substrates. In this paper, we have examined the structural and magnetoresistance (MR) properties of these thin films. The intensity ratio of the G-band and D-band (ID/IG) were 1.1 and 2.4, where the C(sp2) atomic ratio for the thin films samples that were prepared on glass and SiO2 substrates, were observed as 65% and 85%, respectively. The MR properties were examined under a magnetic field ranging from −9 T to 9 T within a 2-K to 40-K temperature range. A positive MR value of 15% was examined at a low temperature of 2 K for the thin films grown on SiO2 substrate at a growth temperature of 400 °C using a 300 mJ/pulse laser frequency. The structural changes may tune the magnetoresistance properties of these a-Carbon materials. These results were demonstrated to be highly promising for carbon-based spintronics and magnetic sensors.

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Waldhauser, W., J. M. Lackner, M. Kot i B. Major. "Dry And Ringer Solution Lubricated Tribology Of Thin Osseoconductive Metal Oxides And Diamond-Like Carbon Films". Archives of Metallurgy and Materials 60, nr 3 (1.09.2015): 2139–44. http://dx.doi.org/10.1515/amm-2015-0359.

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AbstractAchieving fast and strong adhesion to jawbone is essential for dental implants. Thin deposited films may improve osseointegration, but they are prone to cohesive and adhesive fracture due to high stresses while screwing the implant into the bone, leading to bared, less osteoconductive substrate surfaces and nano- and micro-particles in the bone. Aim of this work is the investigation of the cohesion and adhesion failure stresses of osteoconductive tantalum, titanium, silicon, zirconium and aluminium oxide and diamond-like carbon films. The tribological behaviour under dry and lubricated conditions (Ringer solution) reveals best results for diamond-like carbon, while cohesion and adhesion of zirconium oxide films is highest.

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Ji, Jia Ming, Xiao Jing Xu, Dan Chen, Xi Ling Xin, Kun Tian i Xin Lan Sheng. "Improvement of Tribological Behaviour of Biomedical Nanocrystalline Titanium by Magnetron Sputtered CNx/SiC Double Layer Films". Advanced Materials Research 284-286 (lipiec 2011): 825–28. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.825.

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The nano-indentation response and the friction and wear properties of the CNx/SiC (carbon nitride /silicon carbon) double layer thin films (SiC films as interlayer) deposited on nanocrystalline titanium substrate using magnetron sputtering technique at room temperature were investigated. The results show that the CNx films exhibited a low nano-hardness of 8.0 GPa and Young's modulus of 55.0 GPa but a high hardness-to-modulus ratio of 0.146. As sliding against Si3N4 (silicon nitride) ball under Kokubo simulation body fluid (SBF) at room temperature, the CNx films exhibited the superior tribological properties with the friction coefficients of about 0.1 and the special wear rate of about 1.6×10−6 mm3/Nm.

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Kaindl, Reinhard, Bernhard C. Bayer, Roland Resel, Thomas Müller, Viera Skakalova, Gerlinde Habler, Rainer Abart i in. "Growth, structure and stability of sputter-deposited MoS2 thin films". Beilstein Journal of Nanotechnology 8 (22.05.2017): 1115–26. http://dx.doi.org/10.3762/bjnano.8.113.

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Molybdenum disulphide (MoS2) thin films have received increasing interest as device-active layers in low-dimensional electronics and also as novel catalysts in electrochemical processes such as the hydrogen evolution reaction (HER) in electrochemical water splitting. For both types of applications, industrially scalable fabrication methods with good control over the MoS2 film properties are crucial. Here, we investigate scalable physical vapour deposition (PVD) of MoS2 films by magnetron sputtering. MoS2 films with thicknesses from ≈10 to ≈1000 nm were deposited on SiO2/Si and reticulated vitreous carbon (RVC) substrates. Samples deposited at room temperature (RT) and at 400 °C were compared. The deposited MoS2 was characterized by macro- and microscopic X-ray, electron beam and light scattering, scanning and spectroscopic methods as well as electrical device characterization. We find that room-temperature-deposited MoS2 films are amorphous, of smooth surface morphology and easily degraded upon moderate laser-induced annealing in ambient conditions. In contrast, films deposited at 400 °C are nano-crystalline, show a nano-grained surface morphology and are comparatively stable against laser-induced degradation. Interestingly, results from electrical transport measurements indicate an unexpected metallic-like conduction character of the studied PVD MoS2 films, independent of deposition temperature. Possible reasons for these unusual electrical properties of our PVD MoS2 thin films are discussed. A potential application for such conductive nanostructured MoS2 films could be as catalytically active electrodes in (photo-)electrocatalysis and initial electrochemical measurements suggest directions for future work on our PVD MoS2 films.

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Valcheva, E., K. Kirilov, A. Dikovska i T. Milenov. "Low temperature electrical transport in thin carbon films deposited on SiO₂/Si substrates by pulsed laser deposition". Journal of Physics: Conference Series 2487, nr 1 (1.05.2023): 012038. http://dx.doi.org/10.1088/1742-6596/2487/1/012038.

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Abstract In this paper electrical transport studies are performed on thin carbon films deposited on SiO2/Si substrates by pulsed laser deposition (PLD) applying laser ablation of micro-crystalline graphite target. Experiments were carried out on 320 - 420 nm thick SiO2 on Si substrates as well as on hydrogenated diamond-like carbon (DLC) films deposited on SiO2/Si. Structural studies by means of XPS, SEM and Raman spectroscopy revealed that the films can be characterized as nano-sized carbon phases possessing different phase composition (i.e. the ratio sp3/sp2 hybridized carbon, etc.). The electrical conductivity/resistivity of the films was measured in the temperature range 10 K < T < 300 K. Four-contact Van der Pauw method as well as two contact schemes have been applied. Some films have low room temperature resistivity in the range ρ = (0.1–1.5)×10-3 Ω.·m and consist predominantly of sp2 hybridized carbon with Raman spectra, which resemble that of nano-sized graphene depending on the deposition conditions and substrates used. The thinnest only 0.5 nm layer deposited directly on SiO2 exhibits relatively low specific resistance (~10-3 Ω. m), which can be taken as an indication of good deposition conditions of graphene-like layers. The current flow mechanism was explored at temperatures from 300 K down to 10K. The temperature dependence reveals non-metallic behavior - the conductivity decreases at decreasing temperature as opposed to typical metal behaviour. A model of variable range hopping (VRH) mechanism is applied to explain the low temperature conductivity drawn from transport in nanocrystalline disordered systems.

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Banerjee, I., Neelam Kumari, Ashis K. Singh, Mukesh Kumar, Pinaki Laha, A. B. Panda, S. K. Pabi, P. K. Barhai i S. K. Mahapatra. "Influence of RF power on the electrical and mechanical properties of nano-structured carbon nitride thin films deposited by RF magnetron sputtering". Thin Solid Films 518, nr 24 (październik 2010): 7240–44. http://dx.doi.org/10.1016/j.tsf.2010.05.002.

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KANG, SEONG GU, SUNG CHANG PARK, JUN-KI CHUNG, NAM HOON LEE, WON NAM KANG, KYU JEONG SONG, TAE-KEUN LEE i CHEOL JIN KIM. "MICROSTRUCTURAL ANALYSIS OF CORE-SHELL STRUCTURED MgB2 SUPERCONDUCTING FIBERS FABRICATED BY HYBRID PHYSICAL CHEMICAL VAPOR DEPOSITION". Surface Review and Letters 17, nr 03 (czerwiec 2010): 289–92. http://dx.doi.org/10.1142/s0218625x10013692.

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We have deposited MgB 2 thin films on the carbon fiber by hybrid physical–chemical vapor deposition (HPCVD) method which is known as the most effective technique for depositing MgB 2 thin films without pore formation. By adopting carbon fiber as substrate and gas phase reaction between diborane ( B 2 H 6) gas and Mg vapor for MgB 2 formation, core-shell structured MgB 2/ C composite fiber could be synthesized. The high quality of the prepared MgB 2 fibers was confirmed with scanning electron microscopy (SEM), and the critical temperature (T c ) of the sample deposited at 590°C and 12 sccm flow rate of B 2 H 6 was measured at ~40 K. The microstructures of MgB 2 layer was characterized using transmission electron microscopy (TEM). The bright-field TEM images showed MgB 2 with the grain size of several nanometers. The MgB 2 thin film showed highly dense microstructure without pore and well-connected to the carbon fiber interface. High-resolution TEM (HRTEM) images and scanning transmission electron microscopy (STEM) revealed the presence of interface phase between MgB 2 thin films and carbon fiber.

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Silvain, Jean François, P. Richard, Joël Douin, M. Lahaye i Jean Marc Heintz. "Electroless Coating Process of Carbon Nano Fibers by Copper Metal". Materials Science Forum 534-536 (styczeń 2007): 1445–48. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.1445.

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A study of the different stages of the electroless deposition of copper on carbon nano fibers activated firstly by a chemical treatment of the carbon nano fiber and secondly by a two-step method has been performed from both a chemical and a morphological point of view. The combination of XPS measurements and scanning electron microscopy imaging has allowed optimizing the 2 different stage conditions. On a first hand, the different oxide concentration and treatment time of the carbon nano fibers and on a second hand the different conditions of the sensibilisation (Sn bath), activation (Pd bath) and coating (Cu bath) have ben studied. The control of the homogeneity and thickness of copper thin films on carbon nano fiber can be obtained and further more sintered in order to obtain fully dense materials.

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Gao, J. S., K. Umeda, K. Uchino, H. Nakashima i K. Muraoka. "Plasma breaking of thin films into nano-sized catalysts for carbon nanotube synthesis". Materials Science and Engineering: A 352, nr 1-2 (lipiec 2003): 308–13. http://dx.doi.org/10.1016/s0921-5093(02)00912-7.

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Ishak, A., K. Dayana i Mohamad Rusop. "Surface Morphology and Compositional Analysis of Undoped Amorphous Carbon Thin Films via Bias Assisted Pyrolysis-CVD". Advanced Materials Research 667 (marzec 2013): 468–76. http://dx.doi.org/10.4028/www.scientific.net/amr.667.468.

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Amorphous carbon (a:C) were successfully deposited on the silicon surfaces via bias assisted pyrolysis-CVD in the range between 350oC to 500oC with constant of negative bias -50V in 1 hour deposition. The heated of palm oil at about 150oC was vaporized then used for deposited onto p-type silicon substrates. The deposited thin films were characterized by using field emission scanning electron microscopic (FESEM), energy dispersive analyser x-ray (EDAX). We have found carbon element at about 0.15 keV from EDAX with surface morphology formed a nano-ball like structure at 450oC of palm oil precursor. These results indicated deformation of physical and structural thin films caused by applied negative bias and the temperature.

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Xu, Kun, Pei Ding, Yan Li, Leiming Chen, Junwei Xu, Xiangyang Duan i Fanguang Zeng. "Graphene Directly Growth on Non-Metal Substrate from Amorphous Carbon Nano Films Without Transfer and Its Application in Photodetector". Science of Advanced Materials 13, nr 4 (1.04.2021): 574–82. http://dx.doi.org/10.1166/sam.2021.3914.

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A layer of nano amorphous carbon was fabricated on the target substrate by precisely controlled magnetron sputtering, and then a layer of copper film was fabricated on the amorphous carbon. By using a vertical cold wall chemical vapor deposition system under protective atmosphere, the carbon atoms at high temperature was catalyzed by copper to form graphene films. The amorphous carbon nano thin film was converted into monolayer graphene on a SiO2 substrate directly. The experimental results show that the graphene film has high crystal quality and conductivity. Compared with other methods, the process is simple and the process window is wider. By virtue of this technique, a graphene-Si photodetector was also demonstrated. The photoelectric response and frequency characteristics have been studied which shows good device characteristics.

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Martinelli, Natalia M., Maria Julia G. Ribeiro, Ritchelli Ricci, Miller A. Marques, Anderson Oliveira Lobo i Fernanda Roberta Marciano. "In Vitro Osteogenesis Stimulation via Nano-Hydroxyapatite/Carbon Nanotube Thin Films on Biomedical Stainless Steel". Materials 11, nr 9 (29.08.2018): 1555. http://dx.doi.org/10.3390/ma11091555.

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We evaluated the electrophoretic deposition of nanohydroxyapatite/superhydrop hilic multiwalled carbon nanotube composites (nHAp/MWCNT) onto stainless steel biomedical alloys for applications in bone tissue engineering. First, nHAp/MWCNT composites were dispersed into 0.042 mol·L−1 of Ca(NO3)2·4H2O + 0.025 mol·L−1 NH4H2PO4 electrolytes (pH = 4.8) at two different concentrations. Next, a voltage of −2 V was applied using 316L stainless steel as a working electrode (0.27 cm2), a high-purity platinum coil wire was used as the auxiliary electrode, and an Ag/AgCl (3 M) electrode was used as the reference electrode. The nHAp/MWCNT composites were characterized by transmission electron microscopy. The deposited nHAp and nHAp/MWCNT films were characterized by profilometry, scanning electron microscopy, X-ray diffractometry and Raman spectroscopy. Human osteoblast cells were cultivated with the different materials and in vitro cytotoxicity was evaluated using lactate dehydrogenase (LDH) assay. The osteogenesis process was evaluated by mRNA levels of the three genes that are directly related to bone repair: Alkaline Phosphatase, Osteopontin and Osteocalcin. We showed that rough, crystalline apatite thin films containing phases of nHAp were successfully deposited onto 316L stainless steel alloys. Also, we noticed that nHAp/MWCNT thin films deposited onto 316L stainless steel alloys upregulated the expression of important genes related to bone mineralization and maturation. Our results strongly support the possibility of this new alternative to modify the surface of metallic biomedical alloys to promote bone tissue regeneration.

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Hoai Nam, Nguyen Phuong. "Enhanced Performance in Polymer Light Emmiting Diode by Using Ultra-thin Conductive Films as the Buffer Layer". Communications in Physics 24, nr 3S1 (10.10.2014): 7–12. http://dx.doi.org/10.15625/0868-3166/24/3s1/5071.

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The ultra-thin nanocomposite films based on the nano-crystal TiO$_{2}$ (TiO$_{2}$-nc) or multi-walled carbon nano-tube (MWCNTs) were prepared and used as the buffer layers in the fabrication of the organic light-emitting diodes (OLEDs). The injection efficiency of the hole and electron was improved by inserting an ultra-thin buffer layer between the electrodes and emissive layer. The turn-on voltage of the device with the buffer layers was lowered from 4 to 2.5V, and the current density was increased from 0.3 to 0.7~mA/mm$^{2}$, in comparison with the device without such a buffer layer. These devices showed a high efficiency and good stability.

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Xu, Xiao Jing, H. Wang i Xiao Nong Cheng. "Improvement of Tribological Behaviour of Biomedical Nanocrystalline Titanium by Magnetron Sputtered DLC/SiC Double Layer Films". Materials Science Forum 610-613 (styczeń 2009): 1026–33. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.1026.

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The nano-indentation response, the film-substrate adhesion behaviors and the friction and wear properties of the DLC/SiC (diamond-like carbon/silicon carbon) double layer thin films (SiC films as interlayer) deposited on nanocrystalline titanium substrate using magnetron sputtering technique at room temperature were investigated. The results show that the DLC films exhibited a low nano-hardness (7.4 GPa) and Young's modulus (62.2 GPa) but a high hardness-to-modulus ratio (0.119). The films-substrate system displayed a good interface adhesion and a good friction/wear properties with the friction coefficient of about 0.1, the special wear rate in the magnitude order of 10−6 mm3 m−1 N−1 together with little film cracking and interface delaminating even at considerably high contact load, when sliding against Si3N4 (silicon nitride) ball using ball-on-disc wear tester under Kokubo simulation body fluid (SBF) at room temperature. The high wear-resistance is in accordance with the high ductility of the films, the good modulus match in the films-substrate system, and the high hardness-to-modulus ratio of the films. The nano-indentation response, the film-substrate adhesion behaviors and the tribological properties are in accordance and can be ascribed to the high activity of the nanocrystalline Ti substrate

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Long-Yang, Wang, Wang Xiao-Ping, Wang Li-Jun i Zhang Lei. "Field Emission Properties of Ball-Like Nano-Carbon Thin Films Deposited on Mo Films with Accidented Topography". Chinese Physics Letters 25, nr 11 (30.10.2008): 4154–57. http://dx.doi.org/10.1088/0256-307x/25/11/086.

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Tang, Xiao Shan, i Da Li. "Blood Compatibility of TiO_2-xN_x Thin Films Prepared by Improved Ultrasonic Spray Pyrolysis". Advanced Materials Research 197-198 (luty 2011): 208–14. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.208.

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Nitrogen-doped titanium oxide (TiO2-xNx) films were prepared by an improved ultrasonic spray pyrolysis device with buty1 titanate as the titanium source and ammonia as the nitrogen source. X-ray diffraction technique, scanning electronic microscope and UV-VIS spectroscopy were applied to study the microstructure, surface morphology and optical properties of the resulting films. The XRD peak intensity of the as-prepared films decreased with the increasing of nitrogen content and increased with the increasing of temperature, which indicates that the N doping introduced defects or strain in the TiO2film. The SEM results indicate that all the samples have a nano-sized uniform surface. The smallest band gap and best hydrophobicity are obtained at the nitrogen concentration of 4 at. % and deposited at 400°C. The blood compatibility of TiO2-xNxthin films was observed through platelet adhesion. The experiments results show that the amount of thrombus on the TiO2-xNxthin films is much less than that of pyrolytic carbon. The experimental results show that the nano-sized TiO2-xNxthin films will be a new kind of promising materials applied to artificial heart valve and endovascula stent.

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Wen, Feng, Nan Huang, H. Sun, Ping Yang i Jin Wang. "Platelet Adhesion Study and Characteristic of Hydrogenated Carbon Films Synthesized by PIII-D". Key Engineering Materials 288-289 (czerwiec 2005): 323–26. http://dx.doi.org/10.4028/www.scientific.net/kem.288-289.323.

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Amorphous hydrogenated carbon (a-C:H) thin films were deposited on silicon wafers and Ti6Al4V substrate using plasma ion immersion implantation and deposition (PIII-D) at room temperature (R.T.). The composition and structure of a-C:H films were employed by X-ray photoelectron spectra (XPS) and Raman spectra. Nano-indenter tests measured the hardness of the films. In addition, wettability and bloodcompatibility were investigated. In this paper, the effects of hydrogen content on structure, mechanical properties, surface wettability and haemocompatibility were discussed.

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Pathak, Dinesh, Sanjay Kumar, Sonali Andotra, Jibin Thomas, Navneet Kaur, Praveen Kumar i Vaneet Kumar. "New tailored organic semiconductors thin films for optoelectronic applications". European Physical Journal Applied Physics 95, nr 1 (lipiec 2021): 10201. http://dx.doi.org/10.1051/epjap/2021210090.

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In this study, we have investigated new tailored organic semiconductor materials for optoelectronic application, such as organic solar cells. The carbon-based organic semiconductor material has promising advantages in organic thin-film form. Moreover, due to its low cost, organic thin films are suitable and cheaper than inorganic thin-film. The bandgap of organic semiconductors materials can be tuned and mostly lies between 2.0 eV and 4 eV and the optical absorption edge of organic semiconductors typically lies in between 1.7 eV and 3 eV. They can be easily tailored by modifying the carbon chain and legends and looks promising for engineering the bandgap to harness the solar spectrum. In this work, with new tailored organic semiconductors, the solution route is explored which is a low-cost processing method. (Anthracen-9-yl) methylene naphthalene-1-amine; 4-(anthracen-9-ylmethyleneamino)-1,5dimethyl-2-phenyl-1H-pyrazol-3-one and N-(anthracen-9-ylmethyl)-3, 4-dimethoxyaniline thin-films are processed by spin coating method with changing concentration such as 0.05 wt.% and 0.08 wt.%. Thin films of organic semiconductors were prepared on the glass substrate and annealed at 55 °C. The structural and optical behavior of (Anthracen-9-yl) methylene naphthalene-1-amine, 4-(anthracen-9-ylmethyleneamino)-1,5dimethyl-2-phenyl-1H-pyrazol-3-one, and N-(anthracen-9-ylmethyl)-3, 4-dimethoxyaniline organic semiconductors thin films is studied by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and UV-Visible spectroscopy technique. The XRD data of the synthesized sample suggests the nano crystallinity of the organic layers. And, the SEM micrographs show the dense packing when we increase the wt.% 0.05 to 0.08. Additionally, analysis of the optical absorption measurements found that the engineered bandgap of synthesized thin films are 2.18 eV, 2.35 eV, 2.36eV, 2.52eV, and 2.65eV which suggest suitability for applications of optoelectronic devices such as solar cell. Such lightweight, eco-friendly and disposable new carbon-based materials seem to have the potential to replace other traditional hazardous heavy materials for future eco-friendly flat fast electronics.

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Khalakhan, I., M. Dubau, S. Haviar, J. Lavková, I. Matolínová, V. Potin, M. Vorokhta i V. Matolín. "Growth of nano-porous Pt-doped cerium oxide thin films on glassy carbon substrate". Ceramics International 39, nr 4 (maj 2013): 3765–69. http://dx.doi.org/10.1016/j.ceramint.2012.10.215.

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Huang, Jen Ching, Ho Chang i Hui Ti Ling. "The Nanostructure Fabrication on Conductive Diamond-like Carbon Thin Film by Nano-Oxidation Technique". Advanced Materials Research 939 (maj 2014): 671–78. http://dx.doi.org/10.4028/www.scientific.net/amr.939.671.

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This paper mainly focuses in the use of an atomic force microscope, research about the nanooxidation technique of conductive diamond-like carbon thin film in the atmospheric environment. The hardness, high wear resistance and chemical stability of diamond-like carbon thin film is high, and coefficient of friction is low, it is very suitable as a mold material for nanoscale mold. However, tool can only use a diamond cutter to machine the high hardness diamond-like carbon by traditional hard machining method, and tool life is not long. To overcome this drawback, the paper proposed an atomic force microscope (AFM) as a platform, a conductive AFM probe for tool under atmospheric conditions, and imposed nanooxidation technique on conductive diamond-like carbon thin film using electroluminescent etching to carry out nanofabrication processing. During the nanofabrication process, by changing the various processing parameters, such as applied voltage, repeated nanooxidation times and probe speed, etc., in order to understand the effect of processing parameters. The experimental results show, the nanooxidation technique can be carried out nanofabrication on conductive diamond-like carbon thin film successfully. And found that applied voltage, repeated nanooxidation times and probe speed all for the groove depth on the conductive diamond-like carbon thin films have significant influence. Additionally, this study successfully created a nanopattern. Therefore, the adequate machinability of DLC coating was achieved successfully in this study, indicating a promising application in the fabrication of nanopatterns on a nanoscale.

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Xu, Xiao Jing, i Deng Fu Xia. "Friction and Wear Properties of Magnetron Sputtered DLC/SiC Films on Magnesium Alloy". Materials Science Forum 610-613 (styczeń 2009): 853–58. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.853.

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The nano-indentation response and the friction/wear properties of DLC/SiC (diamond-like carbon/silicon carbon) double layer thin films deposited on Mg alloy (AZ91D) substrate using magnetron sputtering technique at room temperature were investigated. The results show that the DLC films displayed low nano-hardness (3.05 GPa), low Young's modulus (24.67 GPa) but high hardness-to-modulus ratio (0.124). The films-substrate system exhibited a good friction and wear properties with the mean friction coefficient of about 0.175, the special wear rate in the magnitude order of 10−6 mm3 m−1 N−1 together with little film-cracking and interface-delaminating, when sliding against Si3N4 (silicon nitride) ball using ball-on-disc wear tester under dry frictional condition. The high wear-resistance is in accordance with high ductility of the films, good modulus match in the films-substrate system, and high hardness-to-modulus ratio of the films. The underlying factors are discussed and are believed to be due to the substrate is Mg, a metal with high activity.

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Wu, Wan-Yu, i Jyh-Ming Ting. "Effects of Process Conditions on the Synthesis and Microstructure of Nano-Scale Metal-Containing Amorphous Carbon Thin Films". Journal of Nanoscience and Nanotechnology 8, nr 5 (1.05.2008): 2623–26. http://dx.doi.org/10.1166/jnn.2008.18294.

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Thin films of metal-containing amorphous carbon (a-C:Me) were deposited on a number of substrates, including silicon, Pt coated silicon, carbon coated silicon, polymer, and glass. The deposition was performed in a dc reactive sputter deposition system equipped with one single magnetron gun. The gases used were various mixtures of CH4 + Ar. The gas mixture was admitted to the deposition chamber at constant flow rate and ratio. Self-assembled alternating layer structure was observed under certain deposition conditions. Correlation between the self-assembled alternating layer structure and deposition parameters is presented and discussed. The role of carbon energy in the segregation of metal and carbon to form the layer structure is addressed.

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Muhammad Irfan, Badaruddin Soomro, Bilal Waseem, Sumaira Nosheen i Abdul Karim Aziz. "Microstructural effects of the substrate on adhesion strength and mechanical properties of TiN Thin Films". International Journal of Science and Research Archive 1, nr 2 (30.12.2020): 022–31. http://dx.doi.org/10.30574/ijsra.2020.1.2.0037.

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Microstructure of base material plays an important role in adhesion strength and mechanical properties of Titanium Nitride (TiN) coating especially to increase the lifecycle of parts when in practical use. Present study covers the influence of grain size/microstructure of plain carbon steel (tailored via heat treatment) on TiN thin films deposited by physical vapor deposition (PVD) technique. Strong effect of grain size (microstructure) on adhesion strength of TiN thin films on annealed, normalized and quenched substrates have been observed. Mechanical characterization of TiN films e.g. Elastic modulus (E), Hardness (Hv), Stiffness (S) etc. have been studied via nano-indentation technique. TiN thin films failure investigation has been performed with Micro scratch testing under progressive load. Film exfoliation under critical loads has been corroborated via scanning electron microscopy (SEM). The results showed that TiN films deposited on fine microstructure substrate possess excellent mechanical properties and good adhesion strength as compared to coarser microstructure substrate. Insights of this study might be helpful in designing engineered thin films on optimized microstructures.

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Badaruddin, Mohd Ragib, Muhamad Rasat Muhamad i Saadah Abdul Rahman. "Multi-phase structured silicon carbon nitride thin films prepared by hot-wire chemical vapour deposition". Thin Solid Films 519, nr 15 (maj 2011): 5082–85. http://dx.doi.org/10.1016/j.tsf.2011.01.133.

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Piedade, Ana P., i Liliana Cangueiro. "Influence of Carbyne Content on the Mechanical Performance of Nanothick Amorphous Carbon Coatings". Nanomaterials 10, nr 4 (18.04.2020): 780. http://dx.doi.org/10.3390/nano10040780.

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This study concerns the evaluation of the coefficient of friction, at different temperatures, of amorphous carbon thin films, deposited onto nanocrystalline sputtered copper coatings by clean-technology rf magnetron sputtering. The aim is to access the capacity of carbon thin films, with different contents of sp2 and sp1 bonds, to act as a solid lubricant for copper surfaces. Raman spectroscopy revealed that all the as-deposited coatings consist of amorphous carbon with low defect content and decreasing carbyne concentration with increasing thickness. The tribological tests at 25 °C and 200 °C revealed that, for the higher temperature, the 15 nm carbon coating present 0.001 friction coefficients at 2 N load. Overall, the study presents a one-step technology for the greener production of solid lubrication systems for micro- and nano-components, avoiding the environmental impact of lubricants.

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