A new and facile method has been developed for the fabrication of low noise carbon fiber nanoelectrodes. The carbon fiber was flame fused sealed in a tip of the glass capillary. The carbon fiber microelectrodes were m...A new and facile method has been developed for the fabrication of low noise carbon fiber nanoelectrodes. The carbon fiber was flame fused sealed in a tip of the glass capillary. The carbon fiber microelectrodes were made by cutting the protruding carbon fiber to a desired length, and the carbon fiber nanoelectrodes were achieved by etching the protruding carbon on the flame to form a nanometer scale tip. The tip of carbon fiber nanoelectrodes can be controlled within the range from 100 to 300 nm. Thus no epoxy wax was involved in the carbon fiber sealed in glass capillary procedure. The carbon fiber nanoelectrodes were inspected by scanning electron microscopy. The results demonstrated that the surface of the electrodes and the glass/fiber interface are very smooth. Thus the noise caused by the glass/fiber is much lower than that caused by fabricates conventionally. The electrodes were characterized by CV and FSCV measurements of the ferricyanide and 5 Hydroxytryptamine(5 HT) neurotransmitters. The results show that the carbon fiber nanoelectrodes have a very excellent electrochemical behaviors and high sensitivity. This experiments offers a new and facile method for the fabrication of carbon fiber nanoelectrodes with very high sensitivity and low noise.展开更多
DNA immobilization on electrode surfaces has been widely used for fabricating sensors since DNA can interact with a wide variety of biomolecules. Recendy, DNA has been demonstrated as an electronic super conductor... DNA immobilization on electrode surfaces has been widely used for fabricating sensors since DNA can interact with a wide variety of biomolecules. Recendy, DNA has been demonstrated as an electronic super conductor and become the most promising biomolecule for application of chemical sensing in biological system. Calf thymus DNA (ct-DNA) is a most popularly used native DNA in many applications. An electrochemical deposition on carbon fiber micro electrode can provide sensitive detection of dopamine in presence of large amount of ascorbic acid.……展开更多
Carbon fiber nanoelectrodes(200-300 nm) were firstly used to amperometricaly monitor the dopamine release from single PC12 cells with temporal resolution and especially more higher spatial resolution than those obtain...Carbon fiber nanoelectrodes(200-300 nm) were firstly used to amperometricaly monitor the dopamine release from single PC12 cells with temporal resolution and especially more higher spatial resolution than those obtained by using microelectrodes. When the nanoelectrode was in a distance 1 μm above the PC12 cell, only one peak signal corresponding to a single vesicle exocytotic event was detected caused from the stimulation with 1 mmol/L nicotine. The spatial difference of exocytosis was also detected by placing the electrode onto the different locations of the cell body, the results have demostrated that the spatial distribution of dopamine in cells is not uniform and the time for stimulating secretion is very different. Nanoelectrodes electrochemical method can provide a powerful tool for observing the temporal and spatial characteristics of the secretion from single cells directly.展开更多
文摘A new and facile method has been developed for the fabrication of low noise carbon fiber nanoelectrodes. The carbon fiber was flame fused sealed in a tip of the glass capillary. The carbon fiber microelectrodes were made by cutting the protruding carbon fiber to a desired length, and the carbon fiber nanoelectrodes were achieved by etching the protruding carbon on the flame to form a nanometer scale tip. The tip of carbon fiber nanoelectrodes can be controlled within the range from 100 to 300 nm. Thus no epoxy wax was involved in the carbon fiber sealed in glass capillary procedure. The carbon fiber nanoelectrodes were inspected by scanning electron microscopy. The results demonstrated that the surface of the electrodes and the glass/fiber interface are very smooth. Thus the noise caused by the glass/fiber is much lower than that caused by fabricates conventionally. The electrodes were characterized by CV and FSCV measurements of the ferricyanide and 5 Hydroxytryptamine(5 HT) neurotransmitters. The results show that the carbon fiber nanoelectrodes have a very excellent electrochemical behaviors and high sensitivity. This experiments offers a new and facile method for the fabrication of carbon fiber nanoelectrodes with very high sensitivity and low noise.
文摘 DNA immobilization on electrode surfaces has been widely used for fabricating sensors since DNA can interact with a wide variety of biomolecules. Recendy, DNA has been demonstrated as an electronic super conductor and become the most promising biomolecule for application of chemical sensing in biological system. Calf thymus DNA (ct-DNA) is a most popularly used native DNA in many applications. An electrochemical deposition on carbon fiber micro electrode can provide sensitive detection of dopamine in presence of large amount of ascorbic acid.……
文摘Carbon fiber nanoelectrodes(200-300 nm) were firstly used to amperometricaly monitor the dopamine release from single PC12 cells with temporal resolution and especially more higher spatial resolution than those obtained by using microelectrodes. When the nanoelectrode was in a distance 1 μm above the PC12 cell, only one peak signal corresponding to a single vesicle exocytotic event was detected caused from the stimulation with 1 mmol/L nicotine. The spatial difference of exocytosis was also detected by placing the electrode onto the different locations of the cell body, the results have demostrated that the spatial distribution of dopamine in cells is not uniform and the time for stimulating secretion is very different. Nanoelectrodes electrochemical method can provide a powerful tool for observing the temporal and spatial characteristics of the secretion from single cells directly.
