Efficient electrochemical biosensors for ethynylestradiol based on the laccase enzyme supported on single walled carbon nanotubes decorated with nanocrystalline carbon quantum dots

2016 ◽  
Vol 8 (39) ◽  
pp. 7254-7259 ◽  
Author(s):  
T. C. Canevari ◽  
F. H. Cincotto ◽  
M. Nakamura ◽  
S. A. S. Machado ◽  
H. E. Toma
Keyword(s):  
Carbon Nanotubes ◽  
Quantum Dots ◽  
Single Walled Carbon Nanotubes ◽  
Carbon Quantum Dots ◽  
Electrochemical Biosensors ◽  
Hybrid Nanomaterial ◽  
Single Walled Carbon ◽  
Laccase Enzyme ◽  
Walled Carbon Nanotubes

A new hybrid nanomaterial based on single-walled carbon nanotubes incorporating nanocrystalline carbon quantum dots (SWCNT/C-dots) was developed.

CHARACTERIZATION OF QUANTUM DOTS, SINGLE WALLED CARBON NANOTUBES AND NICKEL OCTADECYLPHTHALOCYANINE CONJUGATES

2012 ◽  
Vol 11 (02) ◽  
pp. 1250022 ◽  
Author(s):  
SAMSON KHENE ◽  
TEBELLO NYOKONG
Keyword(s):  
Carbon Nanotubes ◽  
Quantum Dots ◽  
Ultra Violet ◽  
Single Walled Carbon Nanotubes ◽  
X Ray ◽  
Single Walled Carbon ◽  
Test Molecule ◽  
Electro Oxidation ◽  
Walled Carbon Nanotubes

In this work nickel octadecylphthalocyanine (NiPc(C10H21)8) and cadmium telluride quantum dots (QDs) capped with thioglycolic acid (TGA) are adsorbed on single walled carbon nanotubes (SWCNT) to form NiPc(C10H21)8 -SWCNT-QDs conjugate. X-ray photoelectron, ultra violet/visible and Raman spectroscopies are used to characterize the conjugate. SWCNT, poly- Ni(O)Pc(C10H21)8 , NiPc(C10H21)8 -SWCNT and NiPc(C10H21)8 -SWCNT-QDs complexes are used to modify glassy carbon electrode (GCE) and used for the electro-oxidation of pentachlorophenol as a test molecule. NiPc(C10H21)8 -SWCNT-QDs electrode gave the best detection current for pentachlorophenol.

scholarly journals A Hybrid Nanomaterial Based on Single Walled Carbon Nanotubes Cross-Linked via Axially Substituted Silicon (IV) Phthalocyanine for Chemiresistive Sensors

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2073 ◽  
Author(s):  
Maxim Polyakov ◽  
Victoria Ivanova ◽  
Darya Klyamer ◽  
Baybars Köksoy ◽  
Ahmet Şenocak ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Relative Humidity ◽  
Single Walled Carbon Nanotubes ◽  
Sensor Response ◽  
Hybrid Nanomaterial ◽  
Single Walled Carbon ◽  
Electron Microscopies ◽  
Transmission Electron ◽  
Different Temperatures ◽  
Walled Carbon Nanotubes

In this work, the novel hybrid nanomaterial SWCNT/SiPc made of single walled carbon nanotubes (SWCNT) cross-linked via axially substituted silicon (IV) phthalocyanine (SiPc) was studied as the active layer of chemiresistive layers for the detection of ammonia and hydrogen. SWCNT/SiPc is the first example of a carbon-based nanomaterial in which an axially substituted phthalocyanine derivative is used as a linker. The prepared hybrid material was characterized by spectroscopic methods, thermogravimetry, scanning and transmission electron microscopies. The layers of the prepared hybrid were tested as sensors toward ammonia and hydrogen by a chemiresistive method at different temperatures and relative humidity as well as in the presence of interfering gases like carbon dioxide, hydrogen sulfide and volatile organic vapors. The hybrid layers exhibited the completely reversible sensor response to both gases at room temperature; the recovery time was 100–200 s for NH3 and 50–120 s in the case of H2 depending on the gas concentrations. At the relative humidity (RH) of 20%, the sensor response was almost the same as that measured at RH 5%, whereas the further increase of RH led to its 2–3 fold decrease. It was demonstrated that the SWCNT/SiPc layers can be successfully used for the detection of both NH3 and H2 in the presence of CO2. On the contrary, H2S was found to be an interfering gas for the NH3 detection.

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