scholarly journals Alternating current response of carbon nanotubes with randomly distributed impurities

2014 ◽  
Vol 105 (17) ◽  
pp. 173106 ◽  
Author(s):  
Daisuke Hirai ◽  
Takahiro Yamamoto ◽  
Satoshi Watanabe
Keyword(s):  
Carbon Nanotubes ◽  
Alternating Current ◽  
Current Response

Anomalous satellite inductive peaks in alternating current response of defective carbon nanotubes

2014 ◽  
Vol 115 (17) ◽  
pp. 174312 ◽  
Author(s):  
Daisuke Hirai ◽  
Takahiro Yamamoto ◽  
Satoshi Watanabe
Keyword(s):  
Carbon Nanotubes ◽  
Alternating Current ◽  
Current Response

UNUSUAL ELECTROCHEMICAL RESPONSE OF ELECTROCHEMICAL ETCHING ON MULTIWALLED CARBON NANOTUBES

NANO ◽  
2008 ◽  
Vol 03 (06) ◽  
pp. 461-467 ◽  
Author(s):  
JIAN-SHAN YE ◽  
GUANGQUAN MO ◽  
WEI DE ZHANG ◽  
XIAO LIU ◽  
FWU-SHAN SHEU
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Electrochemical Impedance ◽  
Electrochemical Etching ◽  
Current Response ◽  
Multiwalled Carbon ◽  
Transmission Electron ◽  
Oxidation Of Glucose ◽  
Total Disappearance ◽  
Electrocatalytic Effects

Multiwalled carbon nanotubes (MWNTs) can be etched at potentials more positive than 1.7 V versus Ag / AgCl (3 M KCl ) in 0.2 M HNO 3. The electrochemically etched MWNTs show an increase in electrochemical impedance and sluggish electron transfer kinetics, and lose the electrocatalytic effects toward the oxidation of glucose, H 2 O 2, uric acid (UA) and L-ascorbic acid (L-AA). Transmission electron microscope (TEM) images reveal that the nanotube tips are cut off by electrochemical oxidation. This may lead to the degradation of electrocatalytic ability in the MWNTs. Furthermore, the current response after different electrochemically etched cycles shows that the electrocatalytic ability of the MWNTs toward different molecules can be tuned by etched cycles. For example, five etched cycles leads to the total disappearance of the oxidative response to L-AA, with the remaining over 50% of the UA current response in the L-AA and UA mixture. Thus, electrochemical etching is a simple yet novel way to tune the electrocatalytic reactivity and improve the selectivity of the MWNTs.

Alternating current response studies on nickel ferrite-niobium composite at room temperature

2018 ◽  
Author(s):  
L. P. Babu Reddy ◽  
H. G. Rajprakash ◽  
B. Chethan ◽  
S. C. Vijayakumari ◽  
Y. T. Ravikiran
Keyword(s):  
Nickel Ferrite ◽  
Room Temperature ◽  
Alternating Current ◽  
Current Response

Single walled carbon nanotubes functionalized with nickel phthalocyanines: effects of point of substitution and nature of functionalization on the electro-oxidation of 4-chlorophenol

2012 ◽  
Vol 16 (01) ◽  
pp. 130-139 ◽  
Author(s):  
Samson Khene ◽  
Tebello Nyokong
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Current Response ◽  
Single Walled Carbon ◽  
Nickel Phthalocyanine ◽  
Phthalocyanine Complex ◽  
Electro Oxidation ◽  
Covalently Linked ◽  
Walled Carbon Nanotubes ◽  
Hydroxy Groups

In this work we report on electrochemical behavior of nickel phthalocyanine derivatives tetrasubstituted peripherally and non-peripherally with hydroxy and used to modify single walled carbon nanotubes. Nickel phthalocyanine complex octasubstituted at the peripheral positions with hydroxy groups was also used to modify single walled carbon nanotubes. Nickel phthalocyanine complex tetrasubstituted with amino groups at peripheral position was covalently and non-covalently linked to single walled carbon nanotubes. All the conjugates of nickel phthalocyanine derivatives with single walled carbon nanotubes were used for the electro oxidation of 4-chlorophenol. The nickel phthalocyanine octabsubstituted with hydroxy groups at the non-peripheral positions gave the best current response and the best resistance against electrode fouling for the oxidation of 4-chlorophenol.

Faradaic alternating current response of the adsorbed redox couple

1990 ◽  
Vol 100 (5-6) ◽  
pp. 321-325 ◽  
Author(s):  
Milivoj Lovrić ◽  
Šebojka Komorsky-Lovrić
Keyword(s):  
Alternating Current ◽  
Redox Couple ◽  
Current Response
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