The multi-wall carbon nanotubes（MWNTs）modified glassy carbon electrode（CNT/GCE）was fabricated and its electrocatalytic activity of hydroquinone was investigated.It was found that the electrochemical behaviors were...The multi-wall carbon nanotubes（MWNTs）modified glassy carbon electrode（CNT/GCE）was fabricated and its electrocatalytic activity of hydroquinone was investigated.It was found that the electrochemical behaviors were greatly improved at CNT/GC,indicating that the redox of hydroquinone could be catalyzed at CNT/GC.The kinetic parameters of thisprocess were calculated.The diffusiong coefficient was 1.7×10-5cm2·s-1,the heterogeneouselectron transfer rate constant k was 0.678s-1,α value was 0.538 and electron transfer numbers was 2.展开更多
The paper describes a controllable layer-by-layer （LBL） self-assembly modification technique of multi-walled carbon nanotubes （MWNTs） and poly（diallyldimethylammonium chloride） （PDDA） towards glassy carbon ele...The paper describes a controllable layer-by-layer （LBL） self-assembly modification technique of multi-walled carbon nanotubes （MWNTs） and poly（diallyldimethylammonium chloride） （PDDA） towards glassy carbon electrode （GCE）, Acetylcholinesterase （ACHE） was immobilized directly to the modified GCE by LBL self-assembly method, the activity value of AChE was detected by using i-t technique based on the modified Ellman method. Then the composition of carbaryl were detected by the enzyme electrode with 0.01U activity value and the detection limit of carbaryl is 10^- 12 g L ^-1 so the enzyme biosensor showed good properties for pesticides residue detection.展开更多
采用循环伏安法、差分脉冲法研究了木犀草素在多壁碳纳米管修饰碳糊电极上的电化学行为。在p H 3.29的B-R缓冲体系中,木犀草素在0.502 V和0.452 V处产生一对明显的氧化还原峰,其峰电流与木犀草素浓度在5.0×10^(-8)~1.0×10^(-5...采用循环伏安法、差分脉冲法研究了木犀草素在多壁碳纳米管修饰碳糊电极上的电化学行为。在p H 3.29的B-R缓冲体系中,木犀草素在0.502 V和0.452 V处产生一对明显的氧化还原峰,其峰电流与木犀草素浓度在5.0×10^(-8)~1.0×10^(-5)mol/L范围内呈良好的线性关系,木犀草素在电极上是受吸附控制的2质子、2电子电极反应过程;在此基础上研究了木犀草素与DNA的相互作用,随着DNA的浓度增加木犀草素的电化学信号逐渐降低,表明木犀草素能与DNA发生明显的相互作用,进一步研究表明木犀草素与DNA的相互作用是以嵌入方式为主。展开更多
文摘The multi-wall carbon nanotubes（MWNTs）modified glassy carbon electrode（CNT/GCE）was fabricated and its electrocatalytic activity of hydroquinone was investigated.It was found that the electrochemical behaviors were greatly improved at CNT/GC,indicating that the redox of hydroquinone could be catalyzed at CNT/GC.The kinetic parameters of thisprocess were calculated.The diffusiong coefficient was 1.7×10-5cm2·s-1,the heterogeneouselectron transfer rate constant k was 0.678s-1,α value was 0.538 and electron transfer numbers was 2.
文摘The paper describes a controllable layer-by-layer （LBL） self-assembly modification technique of multi-walled carbon nanotubes （MWNTs） and poly（diallyldimethylammonium chloride） （PDDA） towards glassy carbon electrode （GCE）, Acetylcholinesterase （ACHE） was immobilized directly to the modified GCE by LBL self-assembly method, the activity value of AChE was detected by using i-t technique based on the modified Ellman method. Then the composition of carbaryl were detected by the enzyme electrode with 0.01U activity value and the detection limit of carbaryl is 10^- 12 g L ^-1 so the enzyme biosensor showed good properties for pesticides residue detection.
文摘采用循环伏安法、差分脉冲法研究了木犀草素在多壁碳纳米管修饰碳糊电极上的电化学行为。在p H 3.29的B-R缓冲体系中,木犀草素在0.502 V和0.452 V处产生一对明显的氧化还原峰,其峰电流与木犀草素浓度在5.0×10^(-8)~1.0×10^(-5)mol/L范围内呈良好的线性关系,木犀草素在电极上是受吸附控制的2质子、2电子电极反应过程;在此基础上研究了木犀草素与DNA的相互作用,随着DNA的浓度增加木犀草素的电化学信号逐渐降低,表明木犀草素能与DNA发生明显的相互作用,进一步研究表明木犀草素与DNA的相互作用是以嵌入方式为主。
