scholarly journals Mechanooptic Regulation of Photoconduction in Functionalized Carbon Nanotubes Decorated with Platinum

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
C. Mercado-Zúñiga ◽  
C. Torres-Torres ◽  
M. Trejo-Valdez ◽  
R. Torres-Martínez ◽  
S. Tarrago-Velez ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Optical Absorption ◽  
Nonlinear Optical ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Vapor ◽  
Photon Absorption ◽  
Chemical Vapor Deposition Method ◽  
Silica Substrate ◽  
Nonlinear Optical Absorption ◽  
Platinum Particles

The observation of photoconduction and nonlinear optical absorption on functionalized multiwall carbon nanotubes decorated with platinum is reported. The samples were prepared by a chemical vapor deposition method. The electrical conductivity of the carbon nanotubes seems to be decreased by the functionalization process; but this property is strongly enhanced after the incorporation of platinum particles. Nonresonant photoconductive experiments at 532 nm and 445 nm wavelengths allow us to detect a selective participation of the platinum to the photoelectrical response. A mechanooptic effect based on Fresnel reflection was obtained through a photoconductive modulation induced by the rotation of a silica substrate where the samples were deposited as a thin film. A two-photon absorption process was identified as the main physical mechanism responsible for the nonlinear optical absorption. We consider that important changes in the nonlinear photon interactions with carbon nanotubes can be related to the population losses derived from phonons and the detuning of the frequency originated by functionalization.

scholarly journals Unidirectional Optical Kerr Transmittance in Hierarchical Carbon/Platinum Nanostructures

Photonics ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 54 ◽  
Author(s):  
Samuel Morales-Bonilla ◽  
Cecilia Mercado-Zúñiga ◽  
Juan Pablo Campos-López ◽  
César Carrillo-Delgado ◽  
Claudia Lizbeth Martínez-González ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Nonlinear Optical ◽  
Volume Fraction ◽  
Multiwall Carbon Nanotubes ◽  
Photon Absorption ◽  
Chemical Vapor Deposition Method ◽  
Wave Mixing ◽  
Third Order ◽  
Single Beam ◽  
Two Wave Mixing

A strong contrast in the third-order nonlinear optical effects exhibited by hierarchical nanostructures explored in a bidirectional optical circuit is reported. The samples were integrated by multiwall carbon nanotubes and platinum-decorated carbon nanotubes synthetized by an aerosol pyrolysis technique and followed by a chemical vapor deposition method. Coupled and decoupled third-order nonlinear optical properties of the nanocomposites were studied. A nanosecond two-wave mixing experiment at 532 nm wavelength was conducted to analyze the optical Kerr effect in the samples. Multi-photonic interactions were evaluated by a single-beam transmittance as a function of input irradiance and volume fraction of the nanoparticles integrated in the nanohybrids. A two-photon absorption process was identified as the main physical mechanism responsible for the anisotropy in the observed optical nonlinearities. Random carbon nanotube networks in film form were put on top of platinum-decorated carbon nanotubes in order to build up a bilayer sample featuring optical selectivity. The switching of optical signals in propagation through the samples was obtained by an orientation-selectable optical transmittance. Unidirectional optically controlled laser pulses dependent on irradiance and polarization in a two-wave mixing was proposed with potential nanophotonic and nanoelectronic applications. The design of signal processing functions driven by nanohybrid platforms can be contemplated.

Influence of silver decoration on the nonlinear optical absorption exhibited by multiwall carbon nanotubes

2014 ◽  
Vol 16 (4) ◽  
Author(s):  
C. Mercado-Zúñiga ◽  
C. Torres-Torres ◽  
M. Trejo-Valdez ◽  
R. Torres-Martínez ◽  
F. Cervantes-Sodi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Optical Absorption ◽  
Nonlinear Optical ◽  
Multiwall Carbon Nanotubes ◽  
Nonlinear Optical Absorption ◽  
Multiwall Carbon

scholarly journals Synthesis, characterization, and electrochemical properties of carbon nanotubes used as cathode materials for Al–air batteries from a renewable source of water hyacinth

2020 ◽  
Vol 9 (1) ◽  
pp. 340-348 ◽  
Author(s):  
Suparat Sasrimuang ◽  
Oranat Chuchuen ◽  
Apichart Artnaseaw
Keyword(s):  
Carbon Nanotubes ◽  
Water Hyacinth ◽  
Multiwall Carbon Nanotubes ◽  
Value Added ◽  
Chemical Vapor ◽  
Electrochemical Measurement ◽  
Chemical Vapor Deposition Method ◽  
Environmental Threats ◽  
Measurement Results ◽  
Noxious Weed

AbstractWater hyacinth (WH) is a noxious weed. Its rapid growth can clog waterways, causing widespread ecological and environmental threats as well as power generation and irrigation issues. In the present study, water hyacinth was utilized as a precursor to synthesize multiwall carbon nanotubes (MWCNTs) using a simple chemical vapor deposition method. FESEM-EDS revealed that the synthesized MWCNTs had noodle-like, dense, and rough surfaces. TEM confirmed that MWCNTs had a bamboo-like structure with the diameter of 30–40 nm, and the wall thickness of approximately 7 nm. The interlayer distance was found to be approximately 0.34 by XRD. Raman spectra displayed three major bands of MWCNTS: D-band at 1,340 cm−1, G-band at 1,596 cm−1, and (D + G)-band between 2,783 and 2,953 cm−1. The ratio of the D-to-G band intensity was 0.94 ± 0.03, indicating that the synthesized MWCNTs had well degree of graphitization. Electrochemical measurement results of the prepared MWCNTs cathode for aluminum–air battery showed that MWCNTs exhibited higher energy capacity than commercial graphite. Collectively, this study shows that water hyacinth could be used effectively as a precursor for the production of MWCNTs, thus successfully converting the noxious weed into high value-added materials.

scholarly journals Magnetic and Electrical Properties of Nitrogen-Doped Multiwall Carbon Nanotubes Fabricated by a Modified Chemical Vapor Deposition Method

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
María Luisa García-Betancourt ◽  
Yadira Itzel Vega-Cantu ◽  
Sofía Magdalena Vega-Díaz ◽  
Aarón Morelos-Gómez ◽  
Mauricio Terrones ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Morphological Changes ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Nitrogen Doped ◽  
Multiwall Carbon

Chemical vapor deposition (CVD) is a preferential method to fabricate carbon nanotubes (CNTs). Several changes have been proposed to obtain improved CNTs. In this work we have fabricated nitrogen-doped multiwall carbon nanotubes (N-MWCNTs) by means of a CVD which has been slightly modified. Such modification consists in changing the content of the by-product trap. Instead of acetone, we have half-filled the trap with an aqueous solution of NaCl (0–26.82 wt.%). Scanning electron microscope (SEM) characterization showed morphological changes depending upon concentration of NaCl included in the trap. Using high resolution transmission electron microscopy several shape changes on the catalyst nanoparticles were also observed. According to Raman spectroscopy results N-MWCNTs fabricated using pure distillate water exhibit better crystallinity. Resistivity measurements performed on different samples by physical properties measurement Evercool system (PPMS) showed metallic to semiconducting temperature dependent transitions when high content of NaCl is used. Results of magnetic properties show a ferromagnetic response to static magnetic fields and the coercive fields were very similar for all the studied cases. However, saturation magnetization is decreased if aqueous solution of NaCl is used in the trap.

scholarly journals Raman Characteristics of Multiwall Carbon Nanotubes on Diatomite

2018 ◽  
pp. 319
Author(s):  
M. Nazhipkyzy ◽  
A. Nurgain ◽  
A.A. Zhaparova ◽  
A.R. Seitkazinova ◽  
N.G. Prikhodko ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Vapor Deposition ◽  
Treatment Process ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Experimental Conditions ◽  
Intensity Ratios ◽  
Multiwall Carbon ◽  
Propane Butane

In this paper, the diatomite mineral from Mugalzhar field, Aktobe region, has been used as a matrix of catalyst particles to synthesize multiwall carbon nanotubes (MWCNTs) by Catalytic Chemical Vapor Deposition method (CCVD). As a source of carbon was used a propane-butane gas mixture, as a catalyst – Ni particles deposited from Ni(NO3)2 solution during heat treatment process at 400–500 °C. The CCVD method was conducted at a different temperature: 650 °C, 700 °C, 750 °C, 800 °C. Obtained MWCNTs were studied by Raman spectroscopy. The characteristics such as crystallinity, defectiveness, diameter of MWCNTs synthesized at different experimental conditions were evaluated from the positions and intensity ratios of Raman peaks of the samples. The results of investigations of the properties of the obtained carbon nanotubes show the dependence of MWCNTs characteristics on CCVD method temperature. The observation of changes in all the three peaks – D, G and 2D, of obtained materials exhibit, that MWCNTs synthesized at 800 °C possess high crystallinity, low defectiveness and larger diameters as compared with carbon nanotubes grown at 650 °C, 700 °C, 750 °C.

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