Preparation and application of graphene-poly (diallyldimethylammoniumchloride)-iron oxide nanoparticles buckypaper for hydrogen peroxide detection.
We have reported the preparation and characterization of a novel, freestanding, paper-like graphene (G)-poly(diallyldimethylammoniumchloride) (PDDA)-Fe3O4 nanoparticles (NPs) composite. This G-based flexible buckypaper (BP) composed of stacked G-PDDA-NP platelets exhibited excellent mechanical properties, superior electrical properties, and enzyme mimetic activity, making it potentially suitable for in electrochemical sensor applications. The negatively charged NPs were immobilized on positively charged G-PDDA through the electrostatic interaction to form nanoscale G-PDDA-NP platelets, which were further assembled by flow-directed assembly to form BP. The resulting BP has macroscopic flexibility and stiffness due to the van der Waals forces between nanoscale G-PDDA-NP platelets and interlocking-tile arrangement of the platelets. The morphology and structure of the individual G-PDDA-NP platelets and the resulting BP were analyzed by using AFM, SEM and EDX. The BP was attached to an Au or Pt electrode to construct a non-enzyme H2O2 chemical sensor. The NPs acted as a "spacer" to increase the distance between the G sheets and decrease the chances of formation of a stacked graphitic structure, thereby increasing the surface area of the G electrode. The Fe3O4 NPs immobilized and embedded in the BP have intrinsic enzyme mimetic activity like natural peroxidase. The high surface area and excellent electrical conductivity of G improved the catalytic properties of NPs. The obtained H2O2, chemical sensor exhibited prominent electrocatalytic activity towards H2O2, with a wide linear range from 10 ppm (approximately 0.3 mM) to 800 ppm (approximately 23 mM), correlation coefficient of 0.986, and a high sensitivity of 218 microA mM(-1) x cm(-2). Such low-cost G-PDDA-NP composite BPs prepared by facile methods pave way towards novel sensors with better performance.
School of Electrical Engineering, Korea University, 5-Ga, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Korea.
Xueque
X
You
Jeejung
J
Kim
Youngmi Kim
YK
Pak
James Jungho
JJ
Pak
D003217:Conductometry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006108:Graphite / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D058185:Magnetite Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008832:Microchemistry / Q000295:instrumentation; D008839:Microelectrodes; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D011095:Polyethylenes / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*
D058185:Magnetite Nanoparticles; D037742:Nanotubes, Carbon; D011095:Polyethylenes; D000644:Quaternary Ammonium Compounds; C041004:poly-N,N-dimethyl-N,N-diallylammonium chloride; D006108:Graphite; D006861:Hydrogen Peroxide