Morphology Studies of SWCNT Dispersed in Conducting Polymer as Potential Sensing Materials

Novel electronic nanomaterial, the carbon nanotube (CNT) has emerged in many sensor applications as such its state dispersion has considerable importance to ensure the sustainability of its electronic properties. In this paper, we reported a state of art conductivity mapping on nanostructure surface of single walled carbon nanotubes (SWCNT) and poly(3-hexylthiophene-2,5-diyl), (P3HT) as potential sensing film. This composite is proposed to give selective analyte anchoring across the film as well as improved carrier mobility. The easy solution processing method was chosen to produce non-covalently wrapped conducting polymer onto the surface of SWCNT. We successfully observed high resolution images of the SWCNT walls that indicated increase of the thickness due to polymer wrapping. The image obtained from conductivity atomic force microscopy (CAFM) show the film’s electrical distribution that correlated with the observed nanostructure of film. Supporting optical characteristics of the nanocomposite obtained from UV-Vis spectroscopy and Raman spectroscopy discussed the morphology of the polymer wrapping and the state of dispersion of the polymer and the nanotubes. It is hypothesized the filament structures made by P3HT/SWCNT can give better sensing performance due to modification of π-π electronic band of SWCNT.

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Nanoscale Evaluation of Multi-Walled Carbon Nanotube’s Performance on Resisting Oxidization of Asphalt

Materials Science Forum ◽

10.4028/www.scientific.net/msf.982.195 ◽

2020 ◽

Vol 982 ◽

pp. 195-200

Author(s):

Abdullah Al Mamun ◽

Okan Sirin

Keyword(s):

Adhesive Force ◽

Force Microscopy ◽

Modified Asphalt ◽

Atomic Force ◽

Resistance To Oxidation ◽

Pavement Engineering ◽

Multi Walled Carbon Nanotubes ◽

Polymer Modified Asphalt ◽

Styrene Butadiene ◽

Walled Carbon Nanotubes

Nanotechnology has contributed significantly to different subfields of the construction industry, including asphalt pavement engineering. The improved properties and new functionalities of the nanomaterials have provided different desired properties of asphalt. In this study, the effectiveness of multi-walled carbon nanotubes (MWCNT) in resisting the oxidation of polymer-modified asphalt was measured. A total of three different percentages (0.5%, 1%, and 1.5%) of MWCNT were used to modify the Styrene-Butadiene (SB) and styrene–butadiene–styrene (SBS) modified asphalt (4% and 5%). The laboratory oxidized asphalt samples were evaluated by an atomic force microscopy machine. The oxidation of the polymer-MWCNT modified asphalt is measured by simulating the existing functional group of the asphalt and as a function of the adhesive force. It is observed that the use of MWCNT in SB and SBS can increase the resistance to oxidation.

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Nanocrystalline Solutions as Precursors to The Spray Deposition of Cdte Thin Films

MRS Proceedings ◽

10.1557/proc-382-461 ◽

1995 ◽

Vol 382 ◽

Cited By ~ 4

Author(s):

Martin Pehnt ◽

Douglas L. Schulz ◽

Calvin J. Curtis ◽

Helio R. Moutinho ◽

Amy Swartzlander ◽

...

Keyword(s):

Thin Films ◽

Atomic Force Microscopy ◽

Grain Size ◽

X Ray Diffraction ◽

X Ray ◽

Force Microscopy ◽

Cdte Nanoparticles ◽

Atomic Force ◽

Vis Spectroscopy ◽

Cdte Thin Films

ABSTRACTIn this article we report the first nanoparticle-derived route to smooth, dense, phase-pure CdTe thin films. Capped CdTe nanoparticles were prepared by injection of a mixture of Cd(CH3)2, (n-C8H17)3 PTe and (n-C8H17)3P into (n-C8H17)3PO at elevated temperatures. The resultant nanoparticles 32-45 Å in diameter were characterized by x-ray diffraction, UV-Vis spectroscopy, transmission electron microscopy, thermogravimetric analysis and energy dispersive x-ray spectroscopy. CdTe thin film deposition was accomplished by dissolving CdTe nanoparticles in butanol and then spraying the solution onto SnO2-coated glass substrates at variable susceptor temperatures. Smooth and dense CdTe thin films were obtained using growth temperatures approximately 200 °C less than conventional spray pyrolysis approaches. CdTe films were characterized by x-ray diffraction, UV-Vis spectroscopy, atomic force microscopy, and Auger electron spectroscopy. An increase in crystallinity and average grain size as determined by x-ray diffraction was noted as growth temperature was increased from 240 to 300 °C. This temperature dependence of film grain size was further confirmed by atomic force microscopy with no remnant nanocrystalline morphological features detected. UV-Vis characterization of the CdTe thin films revealed a gradual decrease of the band gap (i.e., elimination of nanocrystalline CdTe phase) as the growth temperature was increased with bulk CdTe optical properties observed for films grown at 300 °C.

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Scanning Tunneling Microscopy and Atomic Force Microscopy Studies of Conducting Polymer Films

Atomic Force Microscopy/Scanning Tunneling Microscopy ◽

10.1007/978-1-4757-9322-2_24 ◽

1994 ◽

pp. 229-236

Author(s):

Timothy L. Porter

Keyword(s):

Atomic Force Microscopy ◽

Scanning Tunneling Microscopy ◽

Conducting Polymer ◽

Polymer Films ◽

Scanning Tunneling ◽

Tunneling Microscopy ◽

Force Microscopy ◽

Atomic Force ◽

Conducting Polymer Films

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High-resolution transmission electron microscopic investigations of molybdenum thin films on faceted α-Al2O3

Journal of Applied Crystallography ◽

10.1107/s0021889804033126 ◽

2005 ◽

Vol 38 (2) ◽

pp. 260-265 ◽

Cited By ~ 4

Author(s):

Leonore Wiehl ◽

Jens Oster ◽

Michael Huth

Keyword(s):

High Resolution ◽

Three Dimensional ◽

Epitaxial Relationship ◽

Electron Microscopic ◽

Force Microscopy ◽

Atomic Force ◽

Transmission Electron ◽

High Resolution Images ◽

Α Al2o3 ◽

Relationship Of

Epitaxially grown Mo films on a faceted corundum (α-Al2O3)mplane were investigated by transmission electron microscopy. Low- and high-resolution images were taken from a cross-section specimen cut perpendicular to the facets. It was possible to identify unambiguously the crystallographic orientation of these facets and explain the considerable deviation (∼10°) of the experimental interfacet angle, as measured with atomic force microscopy (AFM), from the expected value. For the first time, proof is given for a smooth \{10\bar{1}1\} facet and a curvy facet with orientation near to \{10\bar{1}\bar{2}\}. Moreover, the three-dimensional epitaxial relationship of an Mo film on a faceted corundummsurface was determined.

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Synthesis and electrical properties of conductive polyaniline/ SWCNT nanocomposites

Iraqi Journal of Physics (IJP) ◽

10.30723/ijp.v15i34.126 ◽

2019 ◽

Vol 15 (34) ◽

pp. 106-113

Author(s):

Estabraq T. Abdulla

Keyword(s):

Electrical Properties ◽

In Situ Polymerization ◽

Pure Pani ◽

Electron Interaction ◽

Aniline Monomer ◽

Force Microscopy ◽

Atomic Force ◽

Afm Analysis ◽

Electrical Conductivities ◽

Walled Carbon Nanotubes

The synthesis of conducting polyaniline (PANI) nanocomposites containing various concentrations of functionalized single-walled carbon nanotubes (f-SWCNT) were synthesized by in situ polymerization of aniline monomer. The morphological and electrical properties of pure PANI and PANI/SWCNT nanocomposites were examined by using Fourier transform- infrared spectroscopy (FTIR), and Atomic Force Microscopy (AFM) respectively. The FTIR shows the aniline monomers were polymerized on the surface of SWCNTs, depending on the -* electron interaction between aniline monomers and SWCNTs. AFM analysis showed increasing in the roughness with increasing SWCNT content. The AC, DC electrical conductivities of pure PANI and PANI/SWCNT nanocomposite have been measured in frequency range (50Hz - 600KHz) and in the temperature range from (30 to 160K). The results show the electrical conductivity of the nanocomposite is higher than pure PANI.

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Optical, Structural and Electrical Properties of Electrochemical Synthesis of Thin Film of Polyaniline

Baghdad Science Journal ◽

10.21123/bsj.15.1.73-80 ◽

2018 ◽

Vol 15 (1) ◽

pp. 73-80 ◽

Cited By ~ 1

Author(s):

Baghdad Science Journal

Keyword(s):

X Ray Diffraction ◽

X Ray ◽

Force Microscopy ◽

Morphological Studies ◽

Atomic Force ◽

Vis Spectroscopy ◽

Structural And Electrical Properties ◽

A Cell ◽

Ft Ir ◽

Ir And Raman

Polyaniline membranes of aniline were produced using an electrochemical method in a cell consisting of two poles. The effect of the vaccination was observed on the color of membranes of polyaniline, where analysis as of blue to olive green paints. The sanction of PANI was done by FT-IR and Raman techniques. The crystallinity of the models was studied by X-ray diffraction technique. The different electronic transitions of the PANI were determined by UV-VIS spectroscopy. The electrical conductivity of the manufactured samples was measured by using the four-probe technique at room temperature. Morphological studies have been determined by Atomic force microscopy (AFM). The structural studies have been measured by (SEM).

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Detection Limits of DLS and UV-Vis Spectroscopy in Characterization of Polydisperse Nanoparticles Colloids

Journal of Nanomaterials ◽

10.1155/2013/313081 ◽

2013 ◽

Vol 2013 ◽

pp. 1-10 ◽

Cited By ~ 155

Author(s):

Emilia Tomaszewska ◽

Katarzyna Soliwoda ◽

Kinga Kadziola ◽

Beata Tkacz-Szczesna ◽

Grzegorz Celichowski ◽

...

Keyword(s):

Light Scattering ◽

Dynamic Light Scattering ◽

Point Of View ◽

Spectroscopy Analysis ◽

Force Microscopy ◽

Atomic Force ◽

Transmission Electron ◽

Vis Spectroscopy ◽

The One

Dynamic light scattering is a method that depends on the interaction of light with particles. This method can be used for measurements of narrow particle size distributions especially in the range of 2–500 nm. Sample polydispersity can distort the results, and we could not see the real populations of particles because big particles presented in the sample can screen smaller ones. Although the theory and mathematical basics of DLS technique are already well known, little has been done to determine its limits experimentally. The size and size distribution of artificially prepared polydisperse silver nanoparticles (NPs) colloids were studied using dynamic light scattering (DLS) and ultraviolet-visible (UV-Vis) spectroscopy. Polydisperse colloids were prepared based on the mixture of chemically synthesized monodisperse colloids well characterized by atomic force microscopy (AFM), transmission electron microscopy (TEM), DLS, and UV-Vis spectroscopy. Analysis of the DLS results obtained for polydisperse colloids reveals that several percent of the volume content of bigger NPs could screen completely the presence of smaller ones. The presented results could be extremely important from nanoparticles metrology point of view and should help to understand experimental data especially for the one who works with DLS and/or UV-Vis only.

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Controlled and cellulose eco-friendly synthesis and characterization of Bi2O2CO3 quantum dot nanostructures (QDNSs) and drug delivery study

Scientific Reports ◽

10.1038/s41598-020-78266-6 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Hojat Samarehfekri ◽

Hamid Reza Rahimi ◽

Mehdi Ranjbar

Keyword(s):

Quantum Dot ◽

Optical Band Gap ◽

Biological Therapy ◽

Skin Extract ◽

Force Microscopy ◽

Atomic Force ◽

Vis Spectroscopy ◽

Different Temperatures ◽

Green Capping Agent

AbstractThis work aimed to prepare solvent-free or green Bi2O2CO3 for quantum dot nanostructures (QDNSs) based on cellulose as a stabilizer and green capping agent to sorafenib delivery for liver targeting. Because the walnut tree is one of the most abundant trees in Iran, it was tried to synthesize Bi2O2CO3 QDNSs using a walnut skin extract. The saturation magnetization for Bi2O2CO3 QDNSs was calculated to be 68.1. Also, the size of products was measured at around 60–80 nm with the Debye–Scherrer equation. Moreover, the morphology, functional groups, and crystallography of the Bi2O2CO3 nanoparticles were investigated using atomic force microscopy, scanning electron microscopy, vibrating-sample magnetometer, and Uv–vis spectroscopy. The results demonstrated that Bi2O2CO3 QDNSs have opto-magnetic properties and they can be suggested as the candidate materials for the sorafenib delivery on the liver tissue. The optical band gap estimated for Bi2O2CO3 QDNSs was found to be red-shift from 3.22 eV. This study suggests the preparation of the Bi2O2CO3 QDNSs based on cellulose as new opto-magnetic materials at different temperatures of 180 °C, 200 °C, 220 °C, and 240 °C for sorafenib delivery as a type of biological therapy drug.

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C60 Fullerene as an Effective Nanoplatform of Alkaloid Berberine Delivery into Leukemic Cells

Pharmaceutics ◽

10.3390/pharmaceutics11110586 ◽

2019 ◽

Vol 11 (11) ◽

pp. 586 ◽

Cited By ~ 6

Author(s):

Anna Grebinyk ◽

Svitlana Prylutska ◽

Anatoliy Buchelnikov ◽

Nina Tverdokhleb ◽

Sergii Grebinyk ◽

...

Keyword(s):

Native American ◽

Water Solubility ◽

Middle Eastern ◽

Leukemic Cells ◽

C60 Fullerene ◽

Force Microscopy ◽

Molar Ratios ◽

Atomic Force ◽

Vis Spectroscopy

A herbal alkaloid Berberine (Ber), used for centuries in Ayurvedic, Chinese, Middle-Eastern, and native American folk medicines, is nowadays proved to function as a safe anticancer agent. Yet, its poor water solubility, stability, and bioavailability hinder clinical application. In this study, we have explored a nanosized carbon nanoparticle—C60 fullerene (C60)—for optimized Ber delivery into leukemic cells. Water dispersions of noncovalent C60-Ber nanocomplexes in the 1:2, 1:1, and 2:1 molar ratios were prepared. UV–Vis spectroscopy, dynamic light scattering (DLS), and atomic force microscopy (AFM) evidenced a complexation of the Ber cation with the negatively charged C60 molecule. The computer simulation showed that π-stacking dominates in Ber and C60 binding in an aqueous solution. Complexation with C60 was found to promote Ber intracellular uptake. By increasing C60 concentration, the C60-Ber nanocomplexes exhibited higher antiproliferative potential towards CCRF-CEM cells, in accordance with the following order: free Ber < 1:2 < 1:1 < 2:1 (the most toxic). The activation of caspase 3/7 and accumulation in the sub-G1 phase of CCRF-CEM cells treated with C60-Ber nanocomplexes evidenced apoptosis induction. Thus, this study indicates that the fast and easy noncovalent complexation of alkaloid Ber with C60 improved its in vitro efficiency against cancer cells.

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