scholarly journals Development of highly stable conductive multiwalled carbon nanotube ink using covalent and non-covalent functionalization for electrochemical sensors

2021 ◽  
Author(s):  
Ana Elisa Ferreira Oliveira ◽  
Arnaldo César Pereira ◽  
Lucas Franco Ferreira
Keyword(s):  
Carbon Nanotube ◽  
Functional Groups ◽  
Storage Stability ◽  
Electrochemical Sensors ◽  
Sodium Dodecyl ◽  
Covalent Functionalization ◽  
Multiwalled Carbon ◽  
Ohmic Resistance ◽  
Carbon Nanotube Ink ◽  
Scanning Electron

The purpose of this work was the fabrication of a conductive carbon nanotube (CNT) ink. The proposed CNT ink remained remarkably stable over several months. The method includes combining the covalent and non-covalent functionalization, resulting in ink that exhibits excellent storage stability. The covalent functionalization was performed in the acid medium using H2SO4 and HNO3, while the non-covalent functionalization used sodium dodecyl sulfate (SDS) and ultrasonication. The materials were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), electro­chemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). FTIR and SEM confirmed that at the non-covalent functionalization, SDS was successfully adsorbed on the f-CNT surface, while at the covalent functionalization, the functional groups (-COOH, C=O and -OH) were inserted into the CNT surface. Voltammetry and EIS indicated that SDS in the presence of functional groups facilitates electron transfer by improved electrical conductivity. The final product was a well-dispersed CNT ink with an average ohmic resistance of 18.62 kΩ. This indicates that CNT ink can be used in the fabrication of electrochemical sensors.

Mechanical Property of Multiwall Carbon Nanotube Reinforced Polymer Composites

2018 ◽  
Vol 26 (1) ◽  
pp. 99-104 ◽  
Author(s):  
Chao-Kai Yang ◽  
Yu-Roung Lee ◽  
Tsung-Han Hsieh ◽  
Tao-Hsing Chen ◽  
Tsung-Chieh Cheng
Keyword(s):  
Carbon Nanotube ◽  
Fracture Strain ◽  
Epoxy Polymer ◽  
Multiwall Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Mechanical Reinforcement ◽  
Reinforced Polymer ◽  
Fracture Surface Analysis ◽  
Multiwall Carbon ◽  
Scanning Electron

This study investigates the multiwalled carbon nanotube as potential mechanical reinforcement in epoxy polymer. It is found that, by adding various concentrations of nanotube, both flow stress and fracture strain increased. Furthermore, the presences of the multiwalled carbon nanotubes are found to nucleate crystallization in the epoxy. This crystal growth is thought to enhance the strength of composite. The fracture surface analysis of the composite reinforced by carbon nanotube is used the scanning electron microscopy.

The Preparation and Properties of PEN/MWNT Nanocomposites

2010 ◽  
Vol 44 (21) ◽  
pp. 2453-2460 ◽  
Author(s):  
Jiachun Zhong ◽  
Wenjin Chen ◽  
Kun Jia ◽  
Xiaobo Liu
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Sodium Dodecyl Sulfate ◽  
Rheological Behavior ◽  
Sodium Dodecyl ◽  
Ultrasound Treatment ◽  
Multiwalled Carbon ◽  
Content Ratio ◽  
Dispersion Agent ◽  
Mwnt Content

Polyarylene ether nitrile (PEN)/multiwalled carbon nanotube (MWNT) composites was prepared, and their rheological behavior and mechanical properties were studied. The PEN/MWNT composites have been fabricated via solution mixing by using ultrasound and dispersion agent, and then casting. This results show that the rheological and mechanical properties of the PEN/MWNT nanocomposites prepared by ultrasound treatment with sodium dodecyl sulfate increase more significantly than that of the ultrasound-treated PEN/MWNT composites and the untreated PEN/MWNT composites with the increase in the MWNT content. The rheological and mechanical properties of the PEN/MWNT composites were related with the content ratio of the MWNT and the preparation ways.

Preparation and Characterization of Poly(ε-Caprolactone)/Multiwalled Carbon Nanotube Composites

2007 ◽  
Vol 342-343 ◽  
pp. 737-740
Author(s):  
Hun Sik Kim ◽  
Byung Hyun Park ◽  
Yun Seok Chae ◽  
Jin San Yoon ◽  
Hyoung Joon Jin
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotube ◽  
General Purpose ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites ◽  
Mwcnt Loading ◽  
Scanning Electron

In this study, poly(ε-caprolactone) (PCL)/multiwalled carbon nanotube (MWCNT) composites with different contents of MWCNTs were successfully prepared by solution compounding, a method which could make them good competitors for commodity materials such as general purpose plastics, while allowing them to keep their complete biodegradability. For the homogeneous dispersion of the MWCNTs in the polymer matrix, oxygen-containing groups were introduced on their surface. The mechanical properties of the PCL/MWCNT composites were effectively increased due to the incorporation of the MWCNTs. The composites were characterized using scanning electron microscopy, in order to obtain information on the dispersion of the MWCNTs in the polymeric matrix. In the case of the composites containing 2.0 wt% of MWCNTs in their matrix, the strength and modulus of the composites were increased by 18.4% and 178.4%, respectively. In addition, the dispersion of the MWCNTs in the PCL matrix resulted in a substantial decrease in the electrical resistivity of the composites as the MWCNT loading was increased from 0 to 2.0 wt%.

Hydroxypropyl β-cyclodextrin cross-linked multiwalled carbon nanotube-based chiral nanocomposite electrochemical sensors for the discrimination of multichiral drug atorvastatin isomers

2019 ◽  
Vol 43 (28) ◽  
pp. 11178-11188 ◽  
Author(s):  
Sharad S. Upadhyay ◽  
Ashwini K. Srivastava
Keyword(s):  
Carbon Nanotube ◽  
Human Health ◽  
Electrochemical Sensors ◽  
Multiwalled Carbon Nanotube ◽  
Pharmacological Effects ◽  
Multiwalled Carbon ◽  
Human Organs

Drugs having multiple chiral centres pose a greater risk to the human health as their pharmacological effects on human organs, cells and systems due to more number of enantiomers as compared to that of a single enantiomeric drug.

Preparation and Characterization of Multiwalled Carbon Nanotube/Poly(ε-Caprolactone) Composites via In Situ Polymerization

2007 ◽  
Vol 124-126 ◽  
pp. 1133-1136 ◽  
Author(s):  
Hun Sik Kim ◽  
Byung Hyun Park ◽  
Jin San Yoon ◽  
Hyoung Joon Jin
Keyword(s):  
Carbon Nanotube ◽  
In Situ Polymerization ◽  
Bulk Polymerization ◽  
General Purpose ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
The Matrix ◽  
Scanning Electron

Poly(ε-caprolactone)/multiwalled carbon nanotube (PCL/MWCNT) composites with different MWCNT contents were successfully prepared by in situ bulk polymerization, which could make them good competitors for commodity materials such as general purpose plastics, while allowing them to completely retain their biodegradability. The mechanical properties of the PCL/MWCNT composites were effectively increased due to the incorporation of the MWCNTs. The composites were characterized using scanning electron microscopy, in order to obtain information on the dispersion of the MWCNTs in the polymeric matrix. In the case where 0.5 wt% of MWCNTs were dispersed in the matrix, the strength and modulus of the composite increased by 23% and 71%, respectively. In addition, the dispersion of the MWCNTs in the PCL matrix resulted in a substantial decrease in the electrical resistivity of the composites being observed as the MWCNTs loading was increased from 0 wt% to 0.5 wt%.

scholarly journals Feasibility study on microwave welding of thermoplastic using multiwalled carbon nanotubes as susceptor

2021 ◽  
Vol 11 ◽  
pp. 184798042110029
Author(s):  
Phey Yee Foong ◽  
Chun Hong Voon ◽  
Bee Ying Lim ◽  
Mohd Khairuddin Md Arshad ◽  
Subash CB Gopinath ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Multiwalled Carbon Nanotubes ◽  
Joint Strength ◽  
Multiwalled Carbon Nanotube ◽  
Joint Interface ◽  
Electron Microscopic ◽  
Multiwalled Carbon ◽  
Heating Duration ◽  
Scanning Electron

Despite manufacturers’ goal of molding single component products from plastics, the structures of some of the products are far too complex to be molded as a single piece. Therefore, assembly of subcomponents into the final products is important for the manufacturing of many plastic-based products. To date, welding is the most efficient joining method for plastics. In this study, multiwalled carbon nanotubes were proposed as the susceptor for the microwave welding of high-density polyethylene considering multiwalled carbon nanotube is a good microwave absorber. multiwalled carbon nanotubes were first dispersed in ethanol in an ultrasonic bath to obtain a homogeneous dispersion. Multiwalled carbon nanotubes dispersion was dropped on the targeted area of the prepared dumbbell-shaped sample and dried in an oven at 45°C for 30 min. The sample was then subjected to 800 W microwave irradiation in the domestic microwave oven. The strength of the weld was tested by using tensile testing. Besides, the cross section of the welded joint was characterized by using scanning electron microscopy. The effect of microwave heating duration and the multiwalled carbon nanotube concentration in the dispersion were studied. It was found that the joint strength increased as the heating duration increase from 2 s to 8 s but decreased when the heating duration was further extended to 10 s. Scanning electron microscopic images showed that voids were formed at the joint interface when 10 s was used and resulted in the lowering of joint strength. In the study of the effect of the multiwalled carbon nanotube concentration in the dispersion, joint strength increased when the multiwalled carbon nanotubes concentration increased from 0.25 wt% to 0.75 wt%. However, the joint strength of sample with 1.00 wt% multiwalled carbon nanotube concentration decreased. The presence of a thick unwelded multiwalled carbon nanotubes layer at the joint interface for sample with 1.00 wt% multiwalled carbon nanotubes concentration as shown in scanning electron microscopic image was believed to cause the lowering of joint strength.

scholarly journals Tungsten/Platinum Hybrid Nanowire Growth via Field Emission Using Nanorobotic Manipulation

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Zhan Yang ◽  
Masahiro Nakajima ◽  
Yasuhito Ode ◽  
Toshio Fukuda
Keyword(s):  
Electron Microscope ◽  
Carbon Nanotube ◽  
Scanning Electron Microscope ◽  
Field Emission ◽  
Multiwalled Carbon Nanotube ◽  
Energy Dispersive ◽  
Nanowire Growth ◽  
Multiwalled Carbon ◽  
X Ray ◽  
Scanning Electron

This paper reports tungsten-platinum hybrid nanowire growth via field emission, based on nanorobotic manipulation within a field emission scanning electron microscope (FESEM). A multiwalled carbon nanotube (MWCNT) was used as the emitter, and a tungsten probe was used as the anode at the counterposition, by way of nanomanipulation. By independently employing trimethylcyclopentadienyl platinum (CpPtMe3) and tungsten hexacarbonyl (W(CO)6) as precursors, the platinum nanowire grew on the tip of the MWCNT emitter. Tungsten nanowires then grew on the tip of the platinum nanowire. The hybrid nanowire length wascontrolled by nanomanipulation. Their purity was evaluated using energy-dispersive X-ray spectroscopy (EDS). Thus, it is possible to fabricate various metallic hybrid nanowires by changing the precursor materials. Hybrid nanowires have various applications in nanoelectronics, nanosensor devices, and nanomechanical systems.

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