scholarly journals A sensing mechanism for the detection of carbon nanotubes using selective photoluminescent probes based on ionic complexes with organic dyes

2016 ◽  
Vol 5 (2) ◽  
pp. e16028-e16028 ◽  
Author(s):  
Petro Lutsyk ◽  
Raz Arif ◽  
Jan Hruby ◽  
Anatolii Bukivskyi ◽  
Olexander Vinijchuk ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Organic Dyes ◽  
Ionic Complexes ◽  
Sensing Mechanism

scholarly journals Explosive Molecule Sensing at Lattice Defect Sites in Metallic Carbon Nanotubes

2021 ◽  
Author(s):  
Manasi Doshi ◽  
Eric Paul Fahrenthold
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Experimental Research ◽  
Gas Sensing ◽  
Lattice Defect ◽  
Sensing Mechanism ◽  
Defect Sites ◽  
Chemiresistive Sensing ◽  
Hazardous Gas

Explosives and hazardous gas sensing using carbon nanotube (CNT) based sensors has been a focus of considerable experimental research. The simplest sensors have employed a chemiresistive sensing mechanism, and rely...

Ionization gas sensing mechanism of a hybrid nanostructure with carbon nanotubes and ZnO nanorods

2013 ◽  
Vol 183 ◽  
pp. 81-86 ◽  
Author(s):  
Changhua Zhan ◽  
Yuanzhi Pan ◽  
Zi Wang ◽  
Yanfang Wang ◽  
Hongfei He ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensing ◽  
Zno Nanorods ◽  
Hybrid Nanostructure ◽  
Sensing Mechanism

Ammonia-Gas-Sensing Characteristics of WO3/Carbon Nanotubes Nanocomposites: Effect of Nanotube Content and Sensing Mechanism

2016 ◽  
Vol 8 (3) ◽  
pp. 524-533 ◽  
Author(s):  
Nguyen Van Duy ◽  
Nguyen Duc Hoa ◽  
Nguyen Thanh Dat ◽  
Dang Thi Thanh Le ◽  
Nguyen Van Hieu
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensing ◽  
Ammonia Gas ◽  
Sensing Mechanism ◽  
Sensing Characteristics

Amino-Functionalized Multi-Walled Carbon Nanotubes as Novel Adsorbents for Selective Adsorption of Anionic Dyes in Aqueous Solution

NANO ◽  
2015 ◽  
Vol 10 (05) ◽  
pp. 1550065 ◽  
Author(s):  
Hui Huang ◽  
Jingang Yu ◽  
Wei Liu ◽  
Xinyu Jiang
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Adsorption Kinetics ◽  
Organic Dyes ◽  
Selective Adsorption ◽  
Order Kinetic ◽  
Equilibrium Isotherms ◽  
Anionic Dyes ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this study, amino-functionalized multi-walled carbon nanotubes ( MWCNTs - NH 2) were successfully synthesized via an improved method and used for removal of organic dyes in aqueous solution. The synthesized MWCNTs - NH 2 were characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscope (SEM), etc. The adsorption capacity and selectivity of MWCNTs - NH 2 for organic dyes was evaluated using rhodamine B ( RhB ), malachite green (MG), methyl orange (MO) and congo red (CR) as models. The selective adsorption toward anionic dyes was found for the MWCNTs - NH 2, and MO was selected as a typical anionic dye to deeply investigate the adsorption kinetics, equilibrium isotherms and thermodynamic parameters of the adsorption process. The adsorption kinetics and equilibrium isotherms data fitted well with the pseudo-second-order kinetic equation and Langmuir isotherm model. The thermodynamics study revealed that the adsorption of MO onto MWCNTs - NH 2 was spontaneous, exothermic and physisorptive in nature. The results indicated that MWCNTs - NH 2 are promising nanomaterials for removal of anionic dyes from industrial wastewater.

scholarly journals Plasmonic enhancement of SERS measured on molecules in carbon nanotubes

2017 ◽  
Vol 205 ◽  
pp. 85-103 ◽  
Author(s):  
Niclas S. Mueller ◽  
Sebastian Heeg ◽  
Patryk Kusch ◽  
Etienne Gaufrès ◽  
Nathalie Y.-W. Tang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Roughness ◽  
Organic Dyes ◽  
Plasmonic Enhancement ◽  
Electromagnetic Enhancement ◽  
Atomic Force ◽  
Dynamic Charge ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Walled Carbon Nanotubes

We isolated the plasmonic contribution to surface-enhanced Raman scattering (SERS) and found it to be much stronger than expected. Organic dyes encapsulated in single-walled carbon nanotubes are ideal probes for quantifying plasmonic enhancement in a Raman experiment. The molecules are chemically protected through the nanotube wall and spatially isolated from the metal, which prevents enhancement by chemical means and through surface roughness. The tubes carry molecules into SERS hotspots, thereby defining molecular position and making it accessible for structural characterization with atomic-force and electron microscopy. We measured a SERS enhancement factor of 106 on α-sexithiophene (6T) molecules in the gap of a plasmonic nanodimer. This is two orders of magnitude stronger than predicted by the electromagnetic enhancement theory (104). We discuss various phenomena that may explain the discrepancy (including hybridization, static and dynamic charge transfer, surface roughness, uncertainties in molecular position and orientation), but found all of them lacking in enhancement for our probe system. We suggest that plasmonic enhancement in SERS is, in fact, much stronger than currently anticipated. We discuss novel approaches for treating SERS quantum mechanically that appear promising for predicting correct enhancement factors. Our findings have important consequences on the understanding of SERS as well as for designing and optimizing plasmonic substrates.

Nanoarchitectonic Composites of Mixed and Covalently Linked Multiwalled Carbon Nanotubes and Tetra-[α-(p-amino)benzyloxyl] Phthalocyanine Zinc(II)

2020 ◽  
Vol 20 (5) ◽  
pp. 2713-2721 ◽  
Author(s):  
Guifen Lu ◽  
Xudong Liu ◽  
Peng Zhang ◽  
Li Bao ◽  
Bosheng Zhao
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Photocatalytic Performance ◽  
Organic Dyes ◽  
Spectroscopic Methods ◽  
Multiwalled Carbon ◽  
Photodegradation Efficiency ◽  
Aqueous Environments ◽  
Covalently Linked ◽  
Excellent Stability

The nanoarchitectonic composites mixed-ZnPc-fMWCNT and linked-ZnPc-fMWCNT were prepared through tetra-[α-(p-amino)benzyloxyl]phthalocyanine Zinc(II) (ZnPc) mixed and covalently linked to multiwalled carbon nanotubes (MWCNTs), respectively. Various spectroscopic methods were used to identify the nanocomposites formed between ZnPc and MWCNTs whether by π–π interaction or by covalent linking. Their photocatalytic properties were fully investigated by carrying out the photodegradation of Rhodamine B (RhB) in aqueous solution under visible light irradiation. The nanocomposites displayed excellent photocatalytic performance, with the photodegradation efficiency as high as 94% for linked-ZnPc-fMWCNT and 83% for mixed-ZnPc-fMWCNT within 3 h irradiation. The repetition test revealed that both nanocomposites have excellent stability and recyclability, and then they are promising candidates as eco-friendly photocatalysts for degradation of organic dyes in aqueous environments.

Sign in / Sign up

Export Citation Format

Share Document