scholarly journals An SPR Sensor Chip Based on Peptide-Modified Single-Walled Carbon Nanotubes with Enhanced Sensitivity and Selectivity in the Detection of 2,4,6-Trinitrotoluene Explosives

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4461 ◽  
Author(s):  
Jin Wang ◽  
Sanyang Du ◽  
Takeshi Onodera ◽  
Rui Yatabe ◽  
Masayoshi Tanaka ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Limit Of Detection ◽  
Aromatic Amino Acids ◽  
Single Walled Carbon Nanotubes ◽  
Sensor Chip ◽  
Chip Surface ◽  
Single Walled Carbon ◽  
Spr Sensor ◽  
Enhanced Sensitivity ◽  
Walled Carbon Nanotubes

In this study, we developed a surface plasmon resonance (SPR) sensor chip based on 2,4,6-trinitrotoluene (TNT) recognition peptide-modified single-walled carbon nanotubes (SWCNTs). The carboxylic acid-functionalized SWCNTs were immobilized on a 3-aminopropyltriethoxysilane (APTES)-modified SPR Au chip surface. Through π-stacking between the aromatic amino acids and SWCNTs, the TNT recognition peptide TNTHCDR3 was immobilized onto the surface of the SWCNTs. The peptide–SWCNTs-modified sensor surface was confirmed and evaluated by atomic force microscope (AFM) observation. The peptide–SWCNTs hybrid SPR sensor chip exhibited enhanced sensitivity with a limit of detection (LOD) of 772 ppb and highly selective detection compared with commercialized carboxymethylated dextran matrix sensor chips.

Adsorption and properties of aromatic amino acids on single-walled carbon nanotubes

Nanoscale ◽  
2012 ◽  
Vol 4 (4) ◽  
pp. 1146-1153 ◽  
Author(s):  
Cuihong Wang ◽  
Shuang Li ◽  
Ruiqin Zhang ◽  
Zijing Lin
Keyword(s):  
Carbon Nanotubes ◽  
Amino Acids ◽  
Aromatic Amino Acids ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Nanostructured cobalt phthalocyanine single-walled carbon nanotube platform: electron transport and electrocatalytic activity on epinephrine

2008 ◽  
Vol 12 (12) ◽  
pp. 1289-1299 ◽  
Author(s):  
Bolade O. Agboola ◽  
Alfred Mocheko ◽  
Jeseelan Pillay ◽  
Kenneth I. Ozoemena
Keyword(s):  
Carbon Nanotubes ◽  
Electrocatalytic Activity ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Pyrolytic Graphite ◽  
Single Walled Carbon Nanotubes ◽  
Cobalt Phthalocyanine ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

The fabrication, characterization and application of edge-plane pyrolytic graphite electrode modified with acid-functionalized single-walled carbon nanotubes, nanostructured cobalt phthalocyanine and a mixture of both, towards epinephrine detection and analysis are described. The morphological features of the films were evaluated using atomic force microscopy (AFM). Electrochemistry of these electrodes in [ Fe ( CN )6]3−/4− using cyclic voltammetry and electrochemical impedance spectroscopy showed higher peak current responses with accompanying low electron-transfer resistances in comparison to the bare electrode. The edge-plane pyrolytic graphite-single-walled carbon nanotubes-nanostructured cobalt phthalocyanine electrode exhibited good electrocatalytic activity towards epinephrine oxidation with enhanced peak currents. Analytical studies using edge-plane pyrolytic graphite-single-walled carbon nanotubes-nanostructured cobalt phthalocyanine electrode proved that the electrode is suitable for sensitivity determination of epinephrine in pH 5 conditions judging from the good sensitivity (8.71 ± 0.31 A.M−1), and limit of detection (0.04 µM) and quantification (1.31 µM) obtained. Determination of EP in the absence and presence of ascorbic acid in phosphate buffer pH 5 conditions was carried out and it was established that the presence of AA did not interfere in EP analysis. Rotating disk electrode experiments proved that the catalytic rate constant was 2.28 × 1016 mM−1.s−1.

scholarly journals Single-Walled Carbon Nanotubes (SWCNTs), as a Novel Sorbent for Determination of Mercury in Air

2015 ◽  
Vol 8 (7) ◽  
pp. 273 ◽  
Author(s):  
Farideh Golbabaei ◽  
Ali Ebrahimi ◽  
Hamid Shirkhanloo ◽  
Alireza Koohpaei ◽  
Ali Faghihi-Zarandi
Keyword(s):  
Carbon Nanotubes ◽  
Retention Time ◽  
Limit Of Detection ◽  
Mass Density ◽  
Hollow Structure ◽  
Single Walled Carbon Nanotubes ◽  
Mercury Vapor ◽  
Effective Parameters ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

<p><strong>BACKGROUND: </strong>Based on the noticeable toxicity and numerous application of mercury in industries, removal of mercury vapor through sorbent is an important environmental challenge.</p><p><strong>PURPOSE OF THe STUDY: </strong>Due to their highly porous and hollow structure, large specific surface area, light mass density and strong interaction, Single-Walled Carbon Nanotubes (SWCNTs) sorbent were selected for this investigation.<strong></strong></p><p><strong>METHODS: </strong>In this study, instrumental conditions, method procedure and different effective parameters such as adsorption efficiency, desorption capacity, time, temperature and repeatability as well as retention time of adsorbed mercury were studied and optimized. Also, mercury vapor was determined by cold vapor atomic absorption spectrometry (CV-AAS).Obtained data were analyzed by Independent T- test, Multivariate linear regression and one way–ANOVA finally.</p><p><strong>RESULTS: </strong>For 80 mg nanotubes, working range of SWCNT were achieved 0.02-0.7 mg with linear range (R<sup>2</sup>=0.994).Our data revealed that maximum absorption capacity was 0.5 mg g<sup>-1</sup> as well as limit of detection (LOD) for studied sorbent was 0.006 mg. Also, optimum time and temperature were reported, 10 min and 250 °C respectively. Retention time of mercury on CNTs for three weeks was over 90%. Results of repeated trials indicated that the CNTs had long life, so that after 30 cycles of experiments, efficiency was determined without performance loss.</p><p><strong>CONCLUSION:</strong> Results showed that carbon nanotubes have high potential for efficient extraction of mercury from air and can be used for occupational and environmental purposes. The study of adsorption properties of CNTs is recommended.</p>

scholarly journals Single-Walled Carbon Nanotubes as Enhancing Substrates for PNA-Based Amperometric Genosensors

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 588 ◽  
Author(s):  
Simone Fortunati ◽  
Andrea Rozzi ◽  
Federica Curti ◽  
Marco Giannetto ◽  
Roberto Corradini ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Limit Of Detection ◽  
Single Walled Carbon Nanotubes ◽  
Covalent Immobilization ◽  
Enhancement Effect ◽  
Single Walled Carbon ◽  
Target Dna ◽  
Limit Of Quantitation ◽  
Streptavidin Conjugate ◽  
Walled Carbon Nanotubes

A new amperometric sandwich-format genosensor has been implemented on single-walled carbon nanotubes screen printed electrodes (SWCNT-SPEs) and compared in terms of performance with analogous genoassays developed using the same methodology on non-nanostructured glassy carbon platforms (GC-SPE). The working principle of the genosensors is based on the covalent immobilization of Peptide Nucleic Acid (PNA) capture probes (CP) on the electrode surface, carried out through the carboxylic functions present on SWCNT-SPEs (carboxylated SWCNT) or electrochemically induced on GC-SPEs. The sequence of the CP was complementary to a 20-mer portion of the target DNA; a second biotin-tagged PNA signalling probe (SP), with sequence complementary to a different contiguous portion of the target DNA, was used to obtain a sandwich hybrid with an Alkaline Phosphatase-streptavidin conjugate (ALP-Strp). Comparison of the responses obtained from the SWCNT-SPEs with those produced from the non-nanostructured substrates evidenced the remarkable enhancement effect given by the nanostructured electrode platforms, achieved both in terms of loading capability of PNA probes and amplification of the electron transfer phenomena exploited for the signal transduction, giving rise to more than four-fold higher sensitivity when using SWCNT-SPEs. The nanostructured substrate allowed to reach limit of detection (LOD) of 71 pM and limit of quantitation (LOQ) of 256 pM, while the corresponding values obtained with GC-SPEs were 430 pM and 1.43 nM, respectively.

scholarly journals Simultaneous Determination of Parathion, Malathion, Diazinon, and Pirimiphos Methyl in Dried Medicinal Plants Using Solid-Phase Microextraction Fibre Coated with Single-Walled Carbon Nanotubes

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Reza Ahmadkhaniha ◽  
Nasrin Samadi ◽  
Mona Salimi ◽  
Parisa Sarkhail ◽  
Noushin Rastkari
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Microextraction ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Organophosphorus Pesticides ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Pirimiphos Methyl ◽  
Walled Carbon Nanotubes

A reliable and sensitive headspace solid-phase microextraction gas chromatography-mass spectrometry method for simultaneous determination of different organophosphorus pesticides in dried medicinal plant samples is described. The analytes were extracted by single-walled carbon nanotubes as a new solid-phase microextraction adsorbent. The developed method showed good performance. For diazinon and pirimiphos methyl calibration, curves were linear (r2≥0.993) over the concentration ranges from 1.5 to 300 ng g−1, and the limit of detection at signal-to-noise ratio of 3 was 0.3 ng g−1. For parathion and malathion, the linear range and limit of detection were 2.5–300 (r2≥0.991) and 0.5 ng g−1, respectively. In addition, a comparative study between the single-walled carbon nanotubes and a commercial polydimethylsiloxane fibre for the determination of target analytes was carried out. Single-walled carbon nanotubes fibre showed higher extraction capacity, better thermal stability (over350∘C), and longer lifespan (over 250 times) than the commercial polydimethylsiloxane fibre. The developed method was successfully applied to determine target organophosphorus pesticides in real samples.

Purity Evaluation of Single-Walled Carbon Nanotubes Using Thermogravimetric Analysis

2013 ◽  
Vol 51 (2) ◽  
pp. 137-144
Author(s):  
Naesung Lee ◽  
Jeung Choon Goak ◽  
Tae Yang Kim ◽  
Jongwan Jung ◽  
Young-Soo Seo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermogravimetric Analysis ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Purity Evaluation ◽  
Walled Carbon Nanotubes
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