10771080( 10 ) Virji,.; Huang,.; Kaner,.B.; Weiller,.H.; Nano Lett., 2004, 4 (3 491496( 11 ) Sadek,.Z.; Wlodarski,.; Kalantar-Zadeh. The most important parameter to be controlled in this method for the synthesis of polyaniline nanofibers is the domination of homogeneous nucleation over heterogeneous nucleation. Baker,a, xinwei Huang,b, wyatt Nelson c and, richard. One study proposes the creation of hydrogen gas sensors using polyaniline nanofibers. In a thick enough sample of nanofibers, only the side exposed to the flash will be welded, creating an asymmetric film where one side remains intact as nanofibers while the other side is effectively crosslinked due to welding. Chemical sensing applications edit Polyaniline nanofibers have been shown to be incredibly successful as chemical sensors, as they perform better than conventional polyaniline films in numerous tests. 14 Hydrogen sulfide is a weak acid that is dangerous at low ppm, but polyaniline nanofibers can only give a robust response to strong acids. 2 While the most common oxidant is ammonium peroxydisulfate (APS various others can be used.
One study proposes polyaniline nanofiber composites with metal salts for the detection of hydrogen sulfide. With a moderate flash intensity, the nanofibers will melt rapidly to form a smooth film. Polyaniline is one of the oldest known conducting polymers, being known for over 150 years. Actuators B, 2012, 161, 967-972( 16 ) See also edit. Using mask, welds in specific patterns can be made using this technique. Hydrochloric acid produces nanofibers with a diameter of about 30 nm, while camphorsulfonic acid and perchloric acid produce a diameter of 50 nm and 120 nm respectively.
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Your email address * Please enter a valid email address. 9 They can be used in this application due to their ability to be flash-welded. References edit Jiu,.C.; Dai,.L.; Chan,.H.; Wu,.C.; Sensors, 2009, 9 (2 869880 ( 1 ) a b c d e f g Li,.; Huang,.; Kaner,.B.; Acc. Abstract, conducting polymers are difficult to process, since unlike conventional polymers, they generally do not dissolve in common solvents or melt. Contents, synthesis edit, polymerization pathways of polyaniline and polyaniline nanofibers, as well as the doped/dedoped oxidation/reduction chemistry that can occur. The switching mechanism is thought to be caused through an interaction between the polyaniline nanofibers and the gold nanoparticles, where charge is transferred to the gold nanoparticles from the polyaniline nanofibers due to an induced electric field. This prevents overgrowth onto the existing wires, allowing for compare contrast essay scarlet letter homogeneous nucleation to continue occurring. Phys., 2013, 51 (3 207-209( 3 ) a b Huang,.; Kaner,.B.;.
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