Thermal Chemical Vapor Deposition Technique Research Articles

Highly enhanced and stable field emission performance of CNT – Dielectric (Si3N4) hybrids

In the present study, vertically aligned carbon nanotubes (CNTs) were grown onto Si substrates using a simple thermal chemical vapour deposition (TCVD) technique. Subsequently, the dielectric layer of Si3N4 was coated over the pristine CNTs using the Plasma Enhanced CVD (PECVD) method. Various characterizations were carried out on the as-deposited samples to study the structural properties, surface morphology, elemental composition, and electronic structure. The field emission measurements executed on CNT – Si3N4 samples showed an enhanced current density of 8.28 mA/cm2 compared to the 2.85 mA/cm2 current density of the pristine CNTs. A detailed study reveals that, apart from the basic conventional field emission parameters, the electronic structure of the CNTs, along with the presence of disordered carbon atoms and the presence of the dielectric material, are responsible for enhancing the current density and temporal stability of the CNT – Si3N4 hybrids. The study aids in exploring CNT-dielectric hybrids for better field emission properties with improved stability for field emission applications.

Synthesis of ZnO nanowires by thermal chemical vapor deposition technique: Role of oxygen flow rate

Novel catalyst-free synthesis of hierarchical zinc oxide (ZnO) nanowires (NWs) by atmospheric pressure thermal chemical vapor deposition (TCVD) technique and the impact of different oxygen (O2) flow rates (25, 50, 75, and 100 mL/min) on the optical behavior, crystalline structure, emission response, and surface morphology of the prepared samples were studied in detail. The hierarchical ZnO NWs were characterized by ultraviolet–visible (UV–Vis) spectrophotometer, X-ray diffraction (XRD), photoluminescence (PL) spectroscopy, and field emission scanning electron microscope (FESEM) measurements. The physical characteristics of the samples were found to be intensely influenced by the O2 flow rate. UV–Vis spectrophotometer measurements indicated that the optical energy gap (Eg) of the samples varies from 3.24 eV to 3.10 eV with regulating O2 flow rates from 25 to 100 mL/min. XRD analyses confirmed that all the prepared samples were polycrystalline in nature with hexagonal wurtzite-type crystal structure and a strong preferential direction along the (002) plane. Photoluminescence results revealed that oxygen vacancies were the major defects causing the blue emissions. Besides, the higher flow rate of O2 (100 mL/min) was efficient in decreasing the number of oxygen vacancies accountable for wide visible emission band intensity. FESEM images demonstrated a high density of hierarchical ZnO NWs with diameters ranging from 33 ± 2 nm to 88 ± 5 nm. Based on the FESEM observations, the potential growth mechanism of the hierarchical ZnO NWs was a vapor-solid (VS) process. Our simple systematic process for growth and characterization may provide toward the development of the hierarchical ZnO NWs-based gas sensors.

Field emission characteristics of MWCNT- bimetal (Cu and In) hybrids: Correlation with morphology, microstructure and electronic structure

In the current study, vertically aligned multiwalled carbon nanotubes (MWCNTs) and bi-metal (Cu and In) decorated CNTs were synthesized over Si substrates using Thermal Chemical Vapour Deposition technique and the thermal evaporation method. Different characterization techniques studied the surface morphology, structural properties, and elemental composition of the prepared samples. Field emission measurements were executed on the as-prepared samples. In-Cu-MWCNTs exhibit an enhanced current density of 7.46 mA/cm2 as compared to 2.83 mA/cm2 of pristine CNTs. A meticulous study of the electronic structure along with the basic field emission parameters reveals that the graphitic content of carbon (C) as well as the density of state and electronic structure variation are responsible for the improved field emission properties of the CNT-bimetal hybrids. The study opens a new area of research in CNT-bi-metal decorated hybrids for various field emission applications.

Sugarcane waste based synthesized graphene like nanocarbon (GNC) for shock absorption application

We report on the synthesis, characterization, and shock absorption characteristics of Graphene like Nano Carbon (GNC) prepared by the combustion of biomass (sugarcane waste) using the Rapid Thermal Chemical Vapor Deposition (RT-CVD) technique. Post synthesis, the samples were purified by subjecting them to intercalation and annealing. The synthesised GNCs were then characterised by Raman, Infrared, and UV spectroscopy, together with microscopy. In analysis, the GNCs were observed to be rectangular in shape, thick, having sharp edges and corners, and having an area ∼50–200 μm2 with wrinkles on it. TEM images showed that GNCs exhibit smooth wrinkle contours with bits of dark showing conjugated graphene layers stacked together having multiple defects and dislocations. In Raman spectroscopy, D peak is observed at ∼1335 cm−1 and G peak is observed at ∼1591 cm−1 indicating GNC consists of sp2 and sp3 hybridised complex phases. The Crystalline Length (La), Disordered Length (LD) and Defect Density (nD) have been estimated to be 21.26 nm, 9.60 nm and 1.084 × 10−12/cm2 respectively. FTIR spectra revealed that C-C is present at ∼1420 cm−1 and C-O-C is present at 900 cm−1. In Uv measurements, no typical absorption peak was observed due to the micrometre size of GNC. The shock absorption properties of GNCs were investigated by subjecting them to pressure (~1.5 GPa) using a Split Hopkinson Pressure Bar (SHPB). The obtained mechanical parameters revealed that GNCs absorbed ∼65% of incident energy and ∼15% transmitted, demonstrating their utility in the development of armour, shock and blast mitigating blocks, defense, and space applications.

Effect of Evaporation Boat-Substrate Distance on the Formation of Zinc Oxide Nanostructures

Zinc Oxide (ZnO) is one of the important semiconductor materials which contribute effectively to the development of the semiconductor industry technology. ZnO nanostructures (NSs) were synthesized using thermal chemical vapor deposition (TCVD) technique under atmospheric pressure at different evaporation boat-substrate distances. ZnO NSs were prepared by oxidizing Znic acetate dihydrate powder within quartz tube instead of its outside. The effect of change evaporation boat-substrate distance (2.5, 4.5, 6.5 and 8.5 cm) on the optical and structural properties of ZnO NSs were studied. ZnO NSs were characterized by UV-Visible spectrophotometer, X-ray diffraction (XRD) technique and photoluminescence (PL) spectroscopy to evaluate its optical and structural properties. Optical band gap measurement results exhibited a red-shifted from (3.25 eV) to (3.05 eV), as the separation distance increased from (2.5 cm) to (8.5 cm), respectively. XRD technique confirms that metal oxide was ZnO and having hexagonal structure. The average crystallite size of the samples was decreased from 63.4 to 58.3 nm, with the increase in separation distance from 2.5 to 8.5 cm. Also, the sharpness, strong intensity and narrow width of dominant diffraction peak indicate the high crystallinity of the prepared ZnO NSs. The PL spectra of the ZnO NSs revealed a wide deep-level emission for all the prepared samples. ZnO NSs grown by TCVD technique may provide potential applications in nano-photovoltaics and nano-photodetectors.

Development of electrochemical sensor based on polyalanine/CuCl-Gr/DWCNTs for highly sensitive detection of glyphosate

In this study, a hybrid film based on copper chloride doped graphene/double-walled carbon nanotubes (CuCl-Gr/DWCNTs) was prepared for further application in detection of glyphosate (Gly) at low levels. Gr/DWCNTs film was first fabricated on copper foil and then modified with CuCl using thermal chemical vapor deposition (CVD) technique, before being transferred onto gold screen printed electrode (AuE). An ad-layer polyalanine (PolyA) was introduced on the top of CuCl-Gr/DWCNTs hybrid film by direct electro-deposition from alanine monomer in order to facilitate immobilization of enzyme molecules. The as-prepared PolyA/CuCl-Gr/DWCNT film was finally used for developing Gly electrochemical sensor based on inhibition of Gly towards urease enzyme. The developed Gly sensor showed a high sensitivity of 1383 (μA.ppb−1.cm−2) and a low detection limit (LOD) of 0.54 × 10−3 ppb in a wide concentration range of 10−3 ppb - 50 ppb. Moreover, the sensor was also applied to the detection of Gly in river water samples, with recoveries ranging from 112.8 % to 113.9 % (RSD: 1.54–2.03 %). The results suggested that the developed sensor with high sensitivity can be used for the detection of Gly in water sources.

Multi-layer growth of tungsten disulphide using thermal chemical vapour deposition

Transition metal dichalcogenides, in their 2D form are proven to be significant material for next-generation nanoelectronic and optoelectronic devices. However, for the realization of practical applications, it is very important to devise facile, and cost-effective synthesis routes without compromising their quality. In this work, multi-layer 2D tungsten disulphide (WS2) has been synthesized using thermal assisted chemical vapour deposition technique. The synthesis was carried out using two different substrates, and the effect of relative position of tungsten trioxide powder and substrate on the multi-layer growth of WS2 has been studied. The nucleation density and layer number is observed to be varying with the reaction time and the type of the substrate. The as-synthesized samples were characterized by using field emission scanning electron microscopy, and Raman spectroscopy.

Size-controllable synthesis of 2D Mn3O4 triangular-shaped nanosheets by thermal chemical vapor deposition

In this study, monolayer up to few-layer of Mn 3 O 4 nanosheets grown on c-Si (111) substrates using a thermal chemical vapor deposition (TCVD) technique were investigated in detail, where the growth reaction pressure was varied from 0.12 to 0.72 mbar. The morphology of the triangular-shaped Mn 3 O 4 nanosheet greatly depends on the atomic ratio of O to Mn, which eventually determines the horizontal growth rate of the triangle's edges that forms the shape of the nanosheet. A low O/Mn ratio results in the formation of a triangle with a longer edge as compared to a high O/Mn ratio which produces a shorter edge. The 2D triangular-shaped Mn 3 O 4 nanosheets prepared at 0.42 mbar exhibited a thickness of ∼1.10–2.29 nm (equivalent to the approximate thickness of monolayer-bilayer) with a maximum edge length of ∼850 nm, whereas ultrathin nanosheets with a thickness of ∼1.93–4.68 nm (equivalent to ∼2–3 layers) with an edge length of <250 nm were found at the highest reaction pressure of 0.72 mbar. The results imply a synthesis of 2D Mn 3 O 4 nanosheets with controllability of thickness and edge length that vary from monolayer to ultrathin nanosheets at different O/Mn ratios. By presuming that the Mn 3 O 4 growth along the [001] direction, we performed first-principles density-functional theory calculations to validate the structure and electronic properties of these 2D Mn 3 O 4 nanosheets. Our calculated lattice parameters for the 2D Mn 3 O 4 were considerably close to the experimental measurements. The band structure calculations predicted that the 2D Mn 3 O 4 possessed metallic characteristics. This paper discusses the seed-assisted growth mechanism of these 2D Mn 3 O 4 nanosheets. • Thermal CVD grown Mn 3 O 4 nanosheet. • The atomic ratio between O and Mn controlled the morphologies of the triangular-shaped Mn 3 O 4 nanosheet. • A low O/Mn ratio produced monolayer 2D triangular shaped with a longer edge. • A high O/Mn ratio produced ultrathin nanosheets with thickness up to 3 layers and shorter edge. • Based on DFT calculations, 2D Mn 3 O 4 nanosheet exhibited metallic characteristics.

Fabrication of microlens arrays with high filling factors by combining a thermal reflow and parylene CVD technique and the applications on OLEDs.

In this paper, microlens array (MLA) templates with high filling factors were prepared by combining a thermal reflow method and parylene chemical vapor deposition (CVD). Then photoresist MLAs were replicated from the MLA templates by using ultraviolet nanoimprint technology. The surface morphology of the replicated photoresist MLAs was characterized by scanning an electron microscope and optical microscope. Results show that the photoresist MLAs have a relatively smooth surface, and the filling factor has been improved obviously. Also, the surface profiles of the MLAs were measured. The optical imaging properties of the MLAs were also characterized, and they had a relatively good imaging performance. Finally, the photoresist MLAs were applied on organic LEDs (OLEDs), and their luminance and current efficiencies were measured. Results show that the current efficiency of the OLEDs increased by about 42.41%, 29.01%, and 35.51%, respectively, for OLEDs with circular, hexagonal, and square MLAs. All the results above indicate that it is a simple and effective process to prepare MLA templates with high filling factors by combining thermal reflow and CVD techniques, and the prepared photoresist MLAs have great application potential in OLED areas.

Characterizing and Analyzing the Tribological Behaviour of Diamond Coated Tungsten Carbide (WC)

In this research work, the deposition of diamond coating was done on the tungsten carbide (WC) substrate utilizing the the thermal Chemical Vapour Deposition (CVD) technique. The carbon precursor used for growing the diamond on the tungsten carbide (WC) substrate material was sugarcane bagasse. The tribological properties of deposited diamond coating were studied examined in this paper. For characterization of the developed coating, Field Emission Scanning Electron Microscope (FESEM), Raman spectroscopy and X-ray diffraction (XRD), were used to characterize the developed diamond coating on the substrate material. These processes were used to confirm the presence of diamond coating on the substrate. For inspecting the hardness of the developed diamond coated and un coated samples, the tests of micro-hardness were also executed. The values of the Vickers hardness for the un-coated and the diamond coated substrates were found to be 964.95 HV to 1457.48 HV respectively. This depicted a rise of 51% in the hardness of the un-coated WC inserts. As per ASTM G-99 standards tribological behaviour of the developed coated substrate was also the scope of this work using a pin-on-disc tribometer. The tribological tests showed improvement in the wear resistance of the diamond coated WC inserts as there was a decrease in the value of wear by 57.84 %. The value of the coefficient of friction (COF) also found to be decreased by 51.48%. This paper presents a combined study of using tribological tests and morphologic study showing the advantages of coating diamond on the tungsten carbide (WC) substrate.

CVD Diamond Coated Tungsten Carbide (WC) Tool Inserts

In this paper a self-developed polycrystalline diamond coating was done on tungsten carbide (WC) tool insets by using simple thermal chemical vapor deposition technique. The growth of these diamond films has been carried out at ~900 ºC temperature. The as-grown polycrystalline diamond films on the surface of tungsten carbide tool inserts have been characterized using Raman spectrometer and scanning electron microscope (SEM). The morphological studies reveal that the as-grown diamond films are of high crystalline quality. The as-grown diamond films possess compressive stress. The micro-hardness indentation test of the as-grown diamond films on WC tool inserts and bare have also been done and it has been found that the Vicker’s hardness of the as-grown diamond WC tool inserts is found to be 1423.32 HV which is 29% better than the un-coated tools.

Development of hydrogen-free fully amorphous silicon oxycarbide coating by thermal organometallic chemical vapor deposition technique

In this study, a dense fully amorphous (hydrogen-free) silicon oxycarbide (SiOC) coating was successfully deposited by thermal organometallic chemical vapor deposition (thermal MOCVD) technique using mixtures of liquid hexamethyldisiloxane (HMDSO) and ethanol. The nature of chemical bonding, microstructure and mechanical properties of the prepared coating were studied using field emission scanning electron microscopy (FESEM), scanning transmission electron microscopy (STEM), 29Si magic-angle-spinning nuclear magnetic resonance (MAS NMR), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and nano indentation techniques. The results showed that the prepared silicon oxycarbide coating is fully amorphous and it is composed of SiO4 and SiO3C structural units. The hardness (11.0 GPa) and elastic modulus (96.0 GPa) of the prepared coating were comparable or even better than other SiOC ceramic materials prepared by traditional high temperature processing techniques.

Morphological properties of one-dimensional ZnO nanostructures grown by thermal chemical vapor deposition with defferent source materials

One-dimensional (1D) ZnO nanostructures showing various shapes were synthesized on ZnO-deposited Si substrates using a thermal chemical vapor deposition technique and their morphological, crystallographic, and optical properties were investigated. Relative to ZnO nanostructures prepared at 700 °C, the nanostructures synthesized at 900 °C increased in grain size and were tapered, resulting in the tapering of the 1D ZnO nanostructures. However, the morphologies of two samples fabricated using different source materials are different from each other, which is probably related to the producer gas reactions due to a carbothermal reduction process. All samples showed hexagonal wurtzite structures with a preferred orientation of the (002) plane and revealed photoluminescence spectra with different optical trapping at surface defect states and oxygen vacancies.

Effect of processing temperature on growing bamboo-like carbon nanotubes by chemical vapor deposition

The present article demonstrates a simple, eco-friendly route for the fabrication of carbon nanotubes (CNTs) with different morphologies, including the fascinating bamboo-like structures without complex catalyst/support preparation procedures. A thermal chemical vapor deposition (CVD) technique that utilized natural pozzolan supports and a solid carbon source, that is, a mixture of camphor and ferrocene in a weight ratio of 20:1, was carried out at different temperatures where the ferrocene played also the role of catalyst. The pozzolan chemical composition and mineral identification were determined by energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy. The morphology of the fabricated CNTs was studied via scanning and transmission electron microscopies (SEM and TEM). It was revealed that both conventional tubular and bamboo-like nanotubes grow at 750 °C while the bamboo-like morphology prevails at 850 °C. The better nanostructure uniformity at higher deposition temperature was accompanied by an improved nanotube graphitization degree that was verified by Raman spectroscopy. Yet, the reduction of the CNTs production yield was recorded by thermogravimetric analysis (TGA). The experimental data are interpreted and discussed as an interplay between the CNTs processing temperature, morphology and growth mechanism. Thus, the growth of either tubular or bamboo-like nanostructures is suggested to be ruled by the competitive surface and bulk diffusions of carbon onto and into the catalyst surface. The growth depends on the size of catalyst nanoparticles sintered at different temperatures. The favorable role of the pozzolan supporting materials in the formation of bamboo-like tubes is emphasized.

Study of Grass Shoot-Shape Silicon Nanowires Grown by Thermal Chemical Vapor Deposition

Grass shoot-shape silicon nanowires (SiNWs) with sharp tip have been successfully synthesized on an n-type Si (111) substrates at temperatures of 700 °C and various times using a thermal chemical vapor deposition (TCVD) technique. Au thin film (~10 nm thick) as catalyst were deposited on Si (111) substrates by a radio frequency magnetron sputtering system. Effect of the growth time on morphology of SiNWs has been reported. The morphologies, growth mechanism, homogeneity and crystalline structure of the nanowires were studied by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray diffractometer (XRD) and Raman spectroscopy. SEM images depict morphology of wires in form of nanoneedles (NNs) with base diameter of 60 nm, tip diameter of ∼5 nm and length up to 3 μm. TEM analysis revealed that the nanowires have core-shell structure with Au nanoparticles on the tip. Raman spectrum of as-grown SiNNs exhibited a transverse optical (TO) phonon mode. The obtained results have shown radius and length of the SiNNs increased with increase in growth time.

Structural analysis of the chemical vapour deposition grown molybdenum disulphide nanofilms for multifaceted applications

Background/Objectives: In recent years, the research on molybdenum disulphide (MoS2) has gained significance because of its unique properties and ease of incorporation in hybrid structures, which makes it one of the most suitable materials for devices and multifaceted Applications. The objective of the study is to synthesize MoS2 nanofilms and then to characterize them through X-ray diffraction (XRD) technique. Methods: In this study, MoS2 nanofilms are synthesized on silicon dioxide substrates by the thermal Chemical Vapour Deposition (CVD) technique, where molybdenum trioxide (MoO3) (VI) powder and sulphur (S) flakes are used as precursors. Findings:X-ray diffraction (XRD) measurements have been carried out for the thermal CVD grown MoS2 nanofilm samples. Further, the observed XRD data has been analyzed and the structural analysis of synthesized MoS2 nanofilms is presented in this report. Furthermore, the experimentally observed findings are compared with the standard findings and shown that they are resembling closely. Novelty/Applications: In order to highlight the scope of our work, the important applications, of the molybdenum disulphide nanostructures are also discussed, that make MoS2 nanostructures attractive candidates in fields as diverse as energy, environmental, biomedical and semiconductors. Keywords: Chemical vapour deposition; molybdenum disulphide; nanofilms;XRD; transition metal dichalcogenide

Catalytic-free growth of VACNTs for energy harvesting

The present study introduces a process to grow micro-honeycomb (µ-HC) vertically aligned carbon nanotubes (VACNTs) using thermal chemical vapor deposition technique. Methane is used as a source of carbon and hydrogen gas as a reducing agent. Where, the fabricated µ-HC structure reported in literature involves complex synthesis process and requires a catalyst layer, the novelty of the process used here lies in the fact that no catalyst layer is used for the growth of CNT network, rather copper foil is used as a substrate. The in-situ cracking of CNTs due to water treatment leads to the formation of µ-HC CNT network, which is confirmed by Raman spectroscopy. Further scanning electron microscopy analysis shows that the length of developed µ-HC CNT is ∼5 µm. Hexagonal µ-HC network shows more than 94% absorption in UV-Vis-NIR wavelength region. The designed process provides high-yield with a low-cost synthesis of vertically aligned CNTs having 3 D microarchitecture. The fabricated CNT network can be used as an electrode for supercapacitor, as an active layer in a photovoltaic cell and most of the energy harvesting devices.

Deposition and characterization of amorphous carbon thin film by thermal CVD

Amorphous carbon-based material has attracted a considerable attention for optoelectronic and photovoltaic applications. This remarkable element has expected to have similar properties as silicon and highly stable. This work is focused on the deposition conditions of amorphous carbon thin film for optoelectronic and photovoltaic application. However, amorphous carbon has a complicated structure and high density of defects. Due to the limited factors of the deposited amorphous carbon film, a doping process is required. The amorphous carbon and iodine doped amorphous carbon thin films were deposited on glass and silicon substrates by thermal chemical vapor deposition (CVD) technique using camphor oil as the precursor. The effect of doping temperature in the a-C and a-C:I thin films on electrical and optical properties were characterized. The conductivity of a-C:I thin films increased with the doping temperature at 450°C and it shows large photoconductivity. The photovoltaic behaviour was improved by doping the a-C with the iodine. Effective doping will encourage the future prospect of low cost, clean and high efficiency of carbon-based device.

Electrochemical Detection of Dissolved Hydrogen Sulfide By Platinum-Modified Multi-Walled Carbon Nanotubes Sensors

Multi-walled carbon nanotubes (MWCNTs) were synthesized by thermal chemical vapor deposition (CVD) technique on stainless steel substrates. To catalyze the growth of nanotubes, a thin layer of cobalt catalyst nanoparticles was electrodeposited on the substrates under the optimum deposition potential of −1.1 V vs. SCE, leading to the formation of bamboo-shaped MWCNTs. The structural and chemical characterization of carbon nanotubes by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) confirmed the growth of vertically aligned carbon nanotubes with close ends. The fabricated MWCNTs were subjected to a purification treatment by electrochemical oxidation in sulfuric acid solution. Fourier transform infrared (FTIR) spectroscopy verified the formation of oxygenated functional groups (primarily carbonyl and hydroxyl) at the nanotubes sidewalls after the treatment, and the morphological analyses demonstrated the opening of the nanotubes tips blocked by Co nanoparticles. To improve the catalytic activity of the functionalized MWCNT electrodes and boost their electrochemical performance as biosensors, surface modification of the nanotubes was carried out by the potentiostatic and pulse potential electrodeposition of platinum nanoparticles. The optimum operating parameters were determined as E = −0.6 V, t = 100 s and Eon = −0.6 V, Ton = 100 s, Eoff = −0.35 V, Toff = 10 s in the potentiostatic and pulse potential deposition techniques, respectively. The structural characterizations revealed that the Pt/MWCNT electrode prepared by pulse potential deposition possessed a highly uniform and compact structure of more refined Pt nanoparticles as compared to the Pt/MWCNT electrode modified by the potentiostatic electrodeposition technique. The methanol oxidation reaction (MOR) performance of the fabricated electrodes was investigated by the cyclic voltammetry (CV) tests in an electrolyte containing sulfuric acid and methanol, and the pulse-deposited Pt/MWCNT electrode exhibited superior electrocatalytic activity and anti-CO poisoning capability. The performance of the pulse-deposited Pt/MWCNT electrode as an electrochemical sensor for the detection of dissolved hydrogen sulfide was evaluated. The oxidation of sulfide anions on the designed sensor involved the formation of sulfate species, rather than elemental sulfur, through an irreversible diffusion-controlled process, with a sensitivity of 0.632 μA μM−1 cm−2 and a detection limit of 0.26 μM. These data indicate the remarkable capabilities of the fabricated sensor as a promising candidate for numerous applications in water and wastewater treatment technologies.

X-ray Absorption and Magnetic Circular Dichroism in CVD Grown Carbon Nanotubes.

Nowadays, a deep knowledge of procedures of synthesis of nanostructured materials plays an important role in achieving nano-materials with accurate and wanted properties and performances. Carbon-based nanostructured materials continue to attract a huge amount of research efforts, because of their wide-ranging properties. Using X-ray absorption (XAS) and X-ray magnetic circular dichroism (XMCD) spectroscopy in the soft X-ray regime, by the synchrotron radiation, we studied the L3,2 absorption edges of iron (Fe) nanoparticles, when they are embedded in oriented Multi Wall Carbon Nanotube (MWCNTs) layers grown by thermal Chemical Vapor Deposition (CVD) technique catalyzed by this transition metal. This could allow us to understand the valence state and role of catalysts and thus their electronic and magnetic structures. It is important to note that the control of the size of these tethered nanoparticles is of primary importance for the purpose of tailoring the physical and chemical properties of these hierarchical materials. The MWCNTs samples used in XAS and XMCD measurements were synthesized by the CVD technique. The actual measurements were carried out by the group NEXT of the INFN- LNF with the logistic experimental support of the INFM-CNR and the Synchrotron Elettra Trieste.